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P a g e | 1
TECHNICAL SPECIFICATIONS
LOT1-LOT5
P a g e | 2
Section X. Technical Specifications
Contents
I. Scope of Supply ……………………………………………………………. 2
II. General Specifications ……………………………………………………. 10
III. General Technical Specifications …………………………………….… 17
IV. Particular technical Specifications ……………………………………... 31
V. Technical Specification Lot1 ..............…………………………………… 90
VI. Technical Specifications Lot2 ………………………..………………… 135
VII. Technical Specifications Lot3 ……………………………….…………149
VIII. Technical Specifications Lot4 …………………………………………167
IX. Technical Specifications Lot5 …………………….…………..…………180
P a g e | 3
I) SCOPE OF SUPPLY
ITEM DESCRIPTION Unit Qty
LOT 1
A1 Switch-Disconnecters 36 kV with load breaking head, 3-phase, complete. For top and side
mounting. Pcs
60
A2 SF6 pole mounted Motorise Switch-Disconnecters 36kV with load breaking head, 3-phase,
complete with all protection, control unit (Manuel and auto- operation with interlocked) and
Ability for SCADA application included fibre optic module transceiver (top and side
mounting). With monitor display appear (Volts, Amps, Type of fault,..etc...)
Pcs
10
A3 36kV Autorecloser with relevant set of MV C.T&PT tank type transformers (with CT rating
of 20-40/5A). Ability for SCADA application included fibre optic module transceiver Pcs 12
A4 36kV Autorecloser with relevant set of MV C.T&PT tank type transformers (with CT rating
of 50-100/5A). Ability for SCADA application included fibre optic module transceiver
Pcs 12
A5 36kV Autorecloser with relevant set of MV C.T&PT tank type transformers (with CT rating
of 100-200/5A). Ability for SCADA application included fibre optic module transceiver
Pcs 10
A6 36kV pole mounted Autorecloser with relevant set of MV C.T&PT tank type transformers
(with CT rating of 200-400/5A). Ability for SCADA application
Pcs 5
A7 24kV pole mounted Autorecloser with relevant set of MV C.T&PT tank type transformers
(with CT rating of 40-50/5A). Ability for SCADA application included fibre optic module
transceiver
Pcs
7
A8 24kV pole mounted Autorecloser with relevant set of MV C.T&PT tank type transformers
(with CT rating of 100-200/5A). Ability for SCADA application
Pcs 10
A9 24kV pole mounted Autorecloser with relevant set of MV C.T&PT tank type transformers
(with CT rating of 300-600/5A). Ability for SCADA application included fibre optic
module transceiver
Pcs
3
A10 Metering Unit pole mounted MV measuring 33kV (KW/h,KVAR,..etc..) Class 0.2; With
CT and VT, Ability for SCADA application included fibre optic module transceiver, with
protection fuse
Pcs
80
A11 Metering Unit pole mounted MV measuring 22kV (KW/h,KVAR,..etc.) Class 0.2; With CT
and VT, Ability for SCADA application, with protection fuse
Pcs 30
P a g e | 4
A12 3 Phase 36kV electronic sectionalizer, Nominal current: Actuating current Resettable 6 -
215 A, Types of inrush currents detected Symmetric and asymmetric, Inrush detection time
< 1 cycle. Ability for SCADA application included fibre optic module transceiver
Pcs
30
A13 33kV Fault Indicator (visual) Pcs 100
A14 22kV Fault Indicator (visual) Pcs 30
P a g e | 5
LOT2
B1 36kV, under-ground cable, single core 1x400mm2 AL (XLPE/PVC) Km 140
B2 36kV, under-ground cable, single core 1x150mm2 AL (XLPE/PVC) Km 6
B3 Outdoor termination for 36 KV, under-ground cable, 1 core 1x150mm2 Al (XLPE/PVC)
(Set of 3 phases), Including Compression terminal lug for 150mm2 Al
Set 12
B4 Outdoor termination for 36 KV, under-ground cable, 1 core 1x400mm2 Al (XLPE/PVC)
(Set of 3 phases), Including Compression terminal lug for 400mm2 Al
Set 100
B5 Straight joint for 36 KV, under-ground cable, single core 1x150 mm2 Al (XLPE/PVC)(Set
of 3 phases), Including filler for 150mm2 Al
Set 12
B6 Straight joint for 36 KV, under-ground cable, single core 1x400 mm2 Al (XLPE/PVC)(Set
of 3 phases), Including filler for 400mm2 Al
Set 150
B7 Compression terminal lug for 150mm2AL/Cu with 17 mm hole Pcs 180
B8 Compression terminal lug for 400mm2AL/Cu with 17 mm hole Pcs 200
B9 Cable holder for fastening on steel towers for 36kV, underground cable, single core
1x150mm2 AL (XLPE/PVC))(Set of 3 phases)
Pcs 45
B10 Cable holder for fastening on steel towers for 36kV, underground cable, single core
1x400mm2 AL (XLPE/PVC)(Set of 3 phases)
Pcs 180
P a g e | 6
LOT 3
C1 ACSR conductor 185mm2/25mm2(DIN 48.204) Km 200
C2 ACSR conductor150mm2/15mm2(DIN 48.204) Km 30
C3 ACSR conductor50mm2/15mm2(DIN 48.204) Km 30
C4 ADSS Optical Cable CentraCore included all accosseries, junction boxes and fetings Km 60
C5 Stranded Copper Conductor 35mm2 (Solid). Km 7
C6 Al straps for dead end clamps Km 2
C7 Polymeric tension insulator 36 kV-1170 creepage distance ACSR,complete with Fittings
for Dead end tension set, suitable for fixing (120- 185) mm2 ACSR to steel poles. There
shall be an adjustable part in the set, for adjustment when stringing
Pcs 1800
C8 36 kV Pin insulator 170 mm pin with 2 nuts, 100 mm threads Pcs 2100
C9 Lightning Arresters 36kV Pcs 200
C10 Lightning Arresters 24kV Pcs 120
C11 Parallel groove clamp for ACSR 120- 185 mm2 Pcs 1600
C12 Parallel groove clamp for ACSR 50- 125 mm2 Pcs 180
C13 Automatic Al tension joints for ACSR 50 mm2 Pcs 50
C14 Automatic Al tension joints for ACSR 95 mm2 Pcs 50
C15 Automatic Al tension joints for ACSR 120 mm2 Pcs 50
C16 Automatic Al tension joints for ACSR 185 mm2 Pcs 180
C17 Non Tension Clamp AL (50-240mm2) / AL (50-240mm2) PCS 4000
C18 Fittings for Dead end tension set for ACSR 50/8 and steel poles. PCS 700
C19 Preformed distribution ties for ACSR 185/35 Top Tie PCS 400
C20 Preformed distribution ties for ACSR 185/35 Side Tie PCS 250
C21 Preformed distribution ties for ACSR 185/35 Angel Tie PCS 500
C22 Preformed distribution ties for ACSR 95/15 Top Tie PCS 300
C23 Preformed distribution ties for ACSR 95/15 Side Tie PCS 250
C24 Preformed distribution ties for ACSR 95/15Angel Tie PCS 250
C25 Compression terminal lug for ACSR Rabbit, Al/Cu with 13mm hole.(Cable-shoe) PCS 450
C26 Cu parallel groove connecting clamp (Reinforcement joint) for stranded copper conductor,
Cu 120 mm2 PCS 100
C27 Hang Pin 16mm PCS 1800
C28 Fork ball hook 16mm PCS 1800
C29 Earth Rod 15 cm diameter 1.5 Long Included all accessories connection clamp, joint and
cable shose70mm2 Pcs 600
C30 PVC Insulated Standard Compacted Circular Copper Conductor 1*70 mm2 Yellow/Green Km 3
P a g e | 7
LOT 4
E1 400 kVA, 33-22/0.4 kV Dual ratio outdoor Pole Mounted Distribution Transformer 3 phase,
with off load Tap changer
PCS 15
E2 160 kVA, 33- 22/0.4 kV Dual ratio outdoor Pole Mounted Distribution Transformer 3
phase, with off load Tapchanger
PCS 3
E3 33 kV Capacitor Bank 300 KVAR Set 7
E4 22 kV Capacitor Bank 300 kVAR Set 6
P a g e | 8
LOT 5
J1 Lattice Steel Pole (L.S.P.) (120/130) 12 m complete with the required bolts, washers and
nuts
Pcs
25
J2 Steel Base for (L.S.P.) (120/130); (5.25 m + area conection) long complete with the
required bolts, washers and nuts as drawing
Pcs 25
J3 Lattice Steel Pole (L.S.P.) (90/110) 12 m (K2141) complete with the required bolts,
washers and nuts for fixing with bases.
Pcs 100
J4 Steel Base for (L.S.P.) (90/110) 5 m + area connection) long as drawing Pcs 100
J5 Lattice Steel Pole (L.S.P.) (80/90) 12 m complete with the required bolts, washers and
nuts for fixing with bases.
Pcs 250
J6 Steel Base for (L.S.P.) (80/90) (5 m+ area connection) long (K2134) as drawing Pcs 150
J7 Steel Base for (L.S.P.) (80/90) 2.25 m long Pcs 100
J8 Channel Steel Pole U 14 (12 m) long (K257) complete with the required bolts, washers
and nuts for fixing with bases
Pcs 30
J9 Steel Base for (C.S.P.) U 14 (4 m) long Pcs 15
J10 Steel Base for (C.S.P.) U 14 (2.5 m) long Pcs 15
J11 Tension & Suspension (L.S.P.) Central Arm (K2231) complete with the required bolts,
washers and nuts, Included all accessories for complete installation
Pcs 230
J12 Tension & Suspension (L.S.P.) Central Arm (K2) complete with the required bolts,
washers and nuts, Included all accessories for complete installation
Pcs 449
J13 Tension & Suspension (L.S.P.) Central Arm (K2233) complete with the required bolts,
washers and nuts, Included all accessories for complete installation
Pcs 355
J14 Tension & Suspension (L.S.P.) Central Arm (K2234) complete with the required bolts,
washers and nuts, Included all accessories for complete installation
Pcs 355
J15 Tension & Suspension (L.S.P.) Side Arm (K63) complete with the required bolts,
washers and nuts, Included all accessories for complete installation
Pcs 60
J16 Tension & Suspension (L.S.P.) Side Arm (K12801) complete with the required bolts,
washers and nuts, Included all accessories for complete installation
Pcs 40
J17 Tension & Suspension(L.S.P.)Side Arm (K12801) complete with the required bolts,
washers and nuts (Below Top 75cm), Included all accessories for complete installation
Pcs 40
P a g e | 9
J18 Tension & Suspension(L.S.P.)Side Arm (K12801) complete with the required bolts,
washers and nuts(Below Top 120cm), Included all accessories for complete installation
Pcs 30
J19 Arm for switch or cables (K1743+ K11102) complete with the required bolts, washers
and nuts, Included all accessories for complete installation
Set 60
J20 Arm for cables (K1555) complete with the required bolts, washers and nuts, Included all
accessories for complete installation
Pcs 30
J21 Suspension (U-Shape) Central Arm (K41) complete with the required bolts, washers and
nuts, Included all accessories for complete installation
Pcs 15
J22 Suspension (U-Shape) Central Arm (K42) complete with the required bolts, washers and
nuts, Included all accessories for complete installation
Pcs 15
J23 Anti-Climbing Steel Bars for L.S.P. (K113/8) complete with the required bolts, washers
and nuts
Set 505
J24 Anti-Climbing Steel Bars for C.S.P. (K78/2) complete with the required bolts, washers
and nuts
Set 30
J25 Auxiliary Arm for 1 phase (K160/1) complete with the required bolts, washers and nuts Set 30
J26 Auxiliary Arm for 2 phase (K160/2) complete with the required bolts, washers and nuts Set 15
J27 Auxiliary Arm (K166) complete with the required bolts, washers and nuts Set 12
J28 Auxiliary Arm (K167) complete with the required bolts, washers and nuts Set 10
J29 Auxiliary Arm (K168) complete with the required bolts, washers and nuts Set 7
J30 Lattice Arm for transformer (K183) complete with the required bolts, washers and nuts Set 70
J31 Arm for fixing transformer to K183 (K188) complete with the required bolts, washers
and nuts
Set 30
J32 Arm for top mounted switch (K1561) complete with the required bolts, washers and nuts Set 60
J33 Protection Arm for C.S.P. - earth protection (K81) complete with the required bolts,
washers and nuts
Pcs 30
J34 Special arm for holding capacitor complete with the required bolts, washers and nuts Set 13
P a g e | 10
II. GENERAL SPECIFICATIONS
COMPLETNESS OF CONTRACT
All apparatus, accessories or fittings which may not have been specifically mentioned,
but which are usual or necessary in the respective equipment for the completeness of
the finished work in an operable status, shall be deemed to be included in the Contract
and shall be provided by the Supplier without any extra charge. All equipment shall be
complete in all details, whether or not such details are mentioned in the Specifications.
This includes fixation details and connection clamps and/or terminals.
Any reference in the quantity and price schedules, the delivery period schedule or in the
various clauses and schedules of the text of either the Specification or the Bid, to any
equipment shall imply that the equipment is complete with all accessories, apparatus
and fittings as outlined in sub-clause 1.1.1 above.
The Bidder shall be responsible for ensuring that the equipment supplied is fit for the
purpose intended. Available information on the characteristics of the system to which
the works will be connected and associated will be supplied on request to the Bidder
who shall be responsible for obtaining and determining all applicable knowledge
relevant to the works.
DRAWINGS AND DOCUMENTATION
The Supplier shall prepare and submit to the Purchaser for approval dimensioned
general and detailed design drawings and other pertinent information of all the
Equipment specified in the Specifications.
In the event of any difference between the drawings and the Specifications, the latter
shall prevail.
P a g e | 11
All text on drawings provided by the Supplier shall be in the English language.
All drawings shall be dimensioned in millimeters.
QUALITY OF MATERIALS
All materials supplied under this Contract shall be new and of the best quality and of
the class most suitable for working under the conditions specified and shall withstand
the variations of temperature and atmospheric conditions arising under working
conditions without distortion or deterioration in the setting up of undue stresses in any
parts and also without affecting the suitability of the various parts of the Works for
which they were designed. No toxic material (such as Halon, PCB, and Asbestos) shall
be utilized.
SUPPLIER'S QUALITY ASSURANCE PROCEDURES
The Bidder shall have established a quality assurance system based on ISO 9001 or
9002. The Supplier shall include a documentation of the system with a list of current
procedures, an organigram of the quality organization and the name of the quality
manager. He shall also submit a list of quality revisions performed the last twelve
months with a list of closed and unclosed findings as well planned revisions the coming
twelve months.
The Supplier shall submit for approval a program of quality control and inspection
procedures to assure that the product during manufacture and on completion complies
with the specified requirements. The program shall relate the quality control and
inspection activities to the production cycle. In support of the quality control and
inspection program the Supplier shall provide details of quality control and inspection
procedures available for use in the execution of the Contract. The Supplier shall retain
responsibility for quality control and inspection activities made by his sub-Suppliers and
shall indicate on the program, which items are to be sub-contracted.
P a g e | 12
PLACES OF MANUFACTURE AND SUB-SUPPLIERS
The manufacturer's identity and places of manufacture, testing and inspection before
shipment for the various portions of the Contract shall be specified in the Technical
Schedules and shall not be departed from without the agreement of the Purchaser.
All Suppliers and Sub-suppliers of components and materials shall be subject to the
approval of the Purchaser. Information shall be given on each Sub-order sufficient to
identify the material or equipment, to which the sub-order relates, stating that the
material is subject to inspection by the Purchaser before dispatch.
All equipment offered shall be the product of recognized and experienced manufacturers
and shall be proven equipment of the same basic design and size similar to that which
has been in successful continuous operation for at least three years preferably under
similar climatic conditions. Proven plant reliability and high availability are of prime
importance and the attention of the Bidder is drawn to these particular requirements.
INSPECTION AND TESTING
All materials in the Contract might inspected by the Purchaser and it is the Supplier's
responsibility to advise the Purchaser when equipment and materials are available for
inspection, at least 1 month in advance.
Factory tests on equipment shall be made according to the applicable IEC Standards, or
as specifically specified or according to standards approved by the Purchaser.
Routine tests shall be made on each unit of all equipment.
Proposed equipment shall be type tested. Type test report shall be submitted at bidding stage.
. Instead of carrying out the type tests the Supplier shall submit all certificates needed
of tests made on equipment of the same type; however, the Purchaser reserves the right
of accepting these certificates or to reject them partially or totally.
The Purchaser shall be should be entitled to any additional testing at the manufacturer's
P a g e | 13
place, at site or elsewhere in order to verify that the equipment complies with the
conditions of the Specifications.
A test program shall be submitted to the Purchaser for approval at least 1 month ahead
of the commencement of testing.
Measuring apparatus shall be approved by the Purchaser and if required shall be
calibrated at the expense of the Supplier at an approved laboratory.
PACKING, TRANSPORTATION AND STORAGE
Packing shall give adequate protection to the enclosed materials against mechanical
damage during transport to its final destination, including rough handling during sea,
rail and road transport and transition from one mode of transport to another.
Packing should be stout close-boarded wooden cases of adequate thickness, suitably
braced and banded and lined internally with water-resistant material or equally solid
enclosures.
Steelworks sections and similar items may be bundled provided that the ends are
adequately protected and the enclosing bands or wires are robust.
Indoor electrical equipment must be enclosed in welded polythene envelopes inside
packing cases and the envelopes shall be evacuated or have a desiccant inside.
All items in cases or crates shall be secured so that they are not free to move and cannot
work loose in transport. If rotating parts are shipped within their bearings or mountings,
they must be adequately braced and restrained to prevent relative movement. Loose
items shall be placed in bags in a case, each bag having stitched onto it a label indicating
the number and nature of its contents. Where a filler material is used in a case to restrict
movement or provide additional protection, it must be inorganic and non-hygroscopic.
All surfaces liable to corrosion shall be thoroughly cleaned and special steps adapted to
the nature of the materials and the time interval between packing and unpacking shall
be taken to prevent corrosion. These steps may constitute the greasing on surfaces, the
P a g e | 14
application of a protective coat, enclosure of the items in a hermetically sealed container,
the addition of vapour phase inhibitor paper to the package or other approved means.
Steps shall be taken to ensure that moisture, mould, insects or rodents cannot damage
insulated materials. Items that include materials liable to be damaged by moisture shall
be packed in hermetically sealed containers in which silica gel, or some other approved
desiccant has been inserted.
Cases shall be marked with large lettering to show which side of the case is to be up,
and if the contents are fragile, marked "FRAGILE" in large letters with the international
wineglass symbol. Packages shall be marked with their place of destination in such a
way that rough handling or the effect of weather cannot remove or obliterate the
marking. Each item shall be marked with its gross weight and, for all lifts over two
tones, marks on the cases shall show the correct positions for the slings.
Special steps shall be taken to guard against theft during transport. No small items such
as padlocks nameplates and so forth that could be torn off or unscrewed shall be
accessible.
Cases, crates, barrels and drums shall be banded in such a manner as to obstruct the theft
of any of the timber used for packaging and the bands shall be so secured that they are
not rendered ineffective by shrinkage of the wood.
A descriptive and fully itemized list shall be prepared of the contents of each packing
case. A copy of this list shall be placed in a waterproof envelope under a metal or other
suitable plate securely fastened to the outside of one end of the case, and its position
indicated by stenciling on the case. Where appropriate, drawings showing the erection
markings of the items concerned shall be placed inside the case.
P a g e | 15
All stenciled markings on cases and crates, or other markings on descriptive metal tabs
fixed ton cable drums, bundles of structural steel works and so forth, shall be applied in
two places with a material which cannot wash off and shall be additional to any erection
or other marks or impressions which may be specified elsewhere.
Shipping marks are to be stenciled in oil based paint in block letters and symbols. When
unobstructed flat smooth surfaces of sufficient size are not available on the case for the
shipping marks they are to be stenciled on marine-ply notice boards of adequate size
and of at least 6 mm thickness securely fastened to the packing case. All packing cases,
though not steel containers, shall remain the property of the Purchaser.
P a g e | 16
III) GENERAL TECHNICAL SPECIFICATION
GENERAL
This Chapter covers the general technical specifications of the electrical equipment to
be procured under the contract.
DRAWINGS
The Bidder shall in his Bid enclose overall drawings showing dimensions, internal
components and fixing methods to a detail level allowing the Purchaser to evaluate the
functionality and completeness of the equipment
STANDARDS
Ratings, characteristics, tests and test procedures, etc. for the electrical equipment
encompassed by this specification shall comply with the relevant provisions and
requirements of the Recommendations of the International Electro-technical
Commission (IEC), unless otherwise expressly stated in Particular Technical
Specifications. This applies even where the specific standards are not referred to in the
Particular Specifications. Where the IEC Recommendations do not fully cover all
provisions and requirements for the design, construction, testing, etc. and for equipment
and components that are not covered by IEC Recommendations recognized national
standards shall be applied. The rules of CEE (International Commission for the approval
of electrical equipment) and the standards of CENELEC (Committee European de
Normalization Elecrotechnique) may also be applied.
The latest revision or edition in effect at the time of Bid Invitation shall apply. Where
references are given to numbers in the old numbering system from IEC it shall be taken
as to be the equivalent number in the new five digit number series.
The Precise Standard, complete with identification number, to which the various
equipment and materials are manufactured shall be specifically stated by the Bidder.
P a g e | 17
In case of conflict or disagreement between the particulars of the Standard adopted by
the Bidder and the particulars of this Specification, this Specification shall prevail over
the Standard. All conflicts or disagreements, mentioned above, must be clearly stated,
failing which the materials and equipment offered shall be deemed to comply in every
respect with this Specification both in manufacture and in performance, and compliance
thereof be insisted upon without additional cost to the Purchaser.
UNITS
The Si-system (meter, Newton, second) shall be used throughout the contract covered
by this Specification.
DEFINITIONS
Whenever the following terms or words are found in the specifications and/or other
documents, they shall have the following meaning:
"High Voltage Equipment" (HV)
Mostly used for equipment provided for a maximum operating voltage higher than 36
kV (generically also used for voltages down to 1000 V).
"Medium Voltage Equipment" (MV):
Equipment provided for a maximum operating voltage higher than 1000 V and up to 36
kV.
"Low Voltage Equipment" (LV):
Equipment provided for operation at 1000 V or below. (For transformers the term Low
Voltage Winding is used for the side with lowest rated voltage regardless of value, ref.
IEC 60076). Reference to degree of protection (IP) is according to the classification in
IEC 60529.
PHASE RELATIONSHIP
The standard phase colors are Red (LI), Yellow (L2), and Blue (L3) (RYB).
P a g e | 18
ELECTRICAL DESIGN CRITERIA
All equipment except as explicitly defined in the technical data sheets shall be designed
to withstand the design stresses given below without damage and disruption of service.
All tests shall as a minimum is based on these design parameters.
Item Description Unit 33 22 6.6 0.4
1 Nominal system voltage phase to phase kV 33 22
6.6
0.4
2 Highest system voltage phase - phase 1) kV 36 24 7.2 0.42
3 System Frequency Hz 50 50 50 50
4 System earth(see above) — Solid Solid Solid Solid*
Minimum Design Short circuit Current (1
sec. arch test)2) kA 25 25
5 Impulse withstand voltage (1.2/50 µsee
wave)3) kV peak 170 125
6 Power frequency withstand voltage (1
min.)3) kV 70 50
7
1 Min creepage distance over outdoor
insulators (Pollution class 3-severe, IEC
60815/85-1 2.5cm/kV)
cm 90 60
*: loaded and effectively earthed neutral TN-S system, and TN-C system.
Note 1)
Ref. IEC 60038.
Note 2)
For all current carrying parts the permissible short circuit duration shall be at least
1 second. Indoor equipment shall be arch tested in accordance with IEC 60298
amendment 2. The dynamic or momentary short circuit current on which the equipment
design shall be based shall be computed by multiplying the rms value of the symmetrical
short circuit current by the factor 1.8 xU2.
Note 3)
Ref. IEC 60071
P a g e | 19
AMBIENT TEMPERATURES, RELATIVE HUMIDITY, WIND PRESSURE
Unless otherwise specifically stated in Particular Technical Specification, any
equipment, component and assembly shall be designed for the following service
conditions:
Description Unit Value
1 Altitude of site above sea level m 0 to +1000
2 Ambient Temps: - Maximum
- Minimum
°C
°C
45
-5
3 Wind Speed m/s 15
4 Isokeraunic Level 15
5 Pollution Type Dust
6 Relative Humidity
Maximum
Minimum
%
%
100
10
7 Rainfall Average annual mm 600
8 Hail Yes
9 Fog Yes
10 Sand Storms Occasional
Wherever any of these maximum or 24 hour average temperatures exceed the normal
service condition temperatures of the IEC Recommendations for the relevant equipment,
or of such other standard which is approved to be applied, the permissible temperature
rises of the recommendations or the standard shall be reduced by the same amount as
the difference between the above figures and the normal service condition temperatures.
The Supplier shall guarantee these reduced temperature rises.
MATERIALS
1. STANDARDIZATION OF EQUIPMENT
The Supplier shall be responsible for the standardization of all small mechanical and
electrical equipment, materials and devices.
P a g e | 20
Where electrical sockets are specified Palestine/Israelite standard sockets shall be used.
Single phase sockets shall be 16A with earth plug if nothing else is specified.
Where nothing else is specified, LV power fuses above 63A shall be of high rupturing
capacity cartridge, type NH gl, according to DIN VDE 0636 and IEC 60295. All fuse
bases shall have a load switching capacity and a thermal rating equal to the rating of the
largest fuse it can accommodate.
Miniature circuit breakers shall replace fuses in control and power circuits 63 amps and
below.
2. LOCKING DEVICES AND PADLOCKS
Facilities for applying safety or security padlocks to circuit breaker operating
mechanisms, isolator and switch operating handles, control switches, control cubicles,
outdoor cabinets etc. shall be provided. The facilities shall be suitable for padlocks
having a hasp diameter of 10 mm. Padlocks are not required.
3. ELECTRICAL EQUIPMENT MATERIALS
All material delivered shall be of the best quality and of the class most suitable for
working under the conditions specified and shall withstand the variations of temperature
and atmospheric conditions arising under specified conditions without distortion or
deterioration or the setting up of undue stresses in any. No welding, filling or plugging
of defective parts will be permitted without the sanction in writing of the Purchaser.
Materials that are susceptible to mould growth under tropical conditions shall be treated
to exclude moisture and prevent growth of mould after all machining has been carried
out.
All apparatus, connections and cabling shall be designed and arranged to minimize the
risk of fire and any damage that might be caused in the event of fire. All plastic material
used in boxes, panels and boards shall be self-extinguishable.
P a g e | 21
Copper and aluminum used as electrical conductors shall be of the electrolytic type and
comply with the respective ASTM or DIN Standards.
Cast iron shall not be used for chambers of oil-filled apparatus or for any part of the
equipment that is in tension or subject to impact stresses except where it can be shown
that service experience has been satisfactory with the grade of cast iron and the duty
proposed.
SURFACE TREATMENT AND PAINTING, ELECTRICAL EQUIPMENT
4. CLEANING AND PAINTING
Before painting or filling with oil or compound all un-galvanized parts shall be
thoroughly cleaned, free from rust, scale, burrs, grease and moisture and all external
rough surfaces on castings shall be filled.
Successive coats of paint shall be applied to a clean, dry and properly prepared surface.
Each coat shall be compatible with the preceding coat and the coat to follow.
The color and shade of all painted external surfaces shall be to the approval of the
Purchaser.
The following minimum painting requirement shall apply to all ferrous parts unless
the Supplier can show, to the satisfaction of the Purchaser, which any alternative he
proposes is in all respects equal or superior to the specified requirements:
Apparatus Painting
INTERNAL SURFACES
Oil filled chambers and tanks One coat of oil resisting varnish or paint
Kiosks and apparatus boxes for use
outdoors
Three coats of paint, the final coat being
an anti-corrosion finish colored white or
light grey
Cubicles, kiosks and apparatus boxes for Three coats of paint, the final coat being
P a g e | 22
use indoors a white or light color.
Apparatus Painting
EXTERNAL SURFACES
All un-galvanized surfaces other than
nuts, bolts and washers may be removed
for maintenance purposes, for use
outdoors
At Works
(a) One priming coat of corrosion
inhibiting paint applied immediately after
cleaning
(b) Two coats of non-glossy oil and
weather resisting paint applied after
inspection and testing and before
dispatch.
At Site
One finishing coat of glossy, oil and
weather resisting, non-fading paint
applied after erection is complete. For
equipment dispatched completely
assembled, the final coat may be applied
at the works unless otherwise required by
the Purchaser.
Exposed, un-galvanized nuts, bolts and
washers which may be removed for
maintenance purposes for use outdoors
One coat of oil and weather resisting,
non-fading paint applied after erection
Panels, Cubicles, Kiosks and apparatus
boxes for use indoors
Three coats of paint, the color and finish
of the final coat to be to the approval of
the Purchaser.
P a g e | 23
GALVANIZING
Galvanizing shall be applied by the hot dipped process. The preparation for
galvanizing and the galvanizing process shall not affect the mechanical properties of
the material being coated.
Drilling, punching, cutting, bending, removal of burrs and all machining shall be
completed before galvanizing.
The zinc coating shall be smooth, clean and of uniform thickness and free from defects.
The preparation for galvanizing and the galvanizing itself shall not adversely affect the
mechanical properties of the coated material. All galvanized steel that has been cut,
drilled or worked on site shall be painted with an approved zinc rich paint.
The average thickness of the zinc coating shall be equivalent to not less than 0.6 kg/m2
of zinc for all surfaces, except steel wires, bolts and nuts. Galvanizing will be tested in
accordance with the appropriate standards in order to determine that it complies with
this requirement. The thickness of the zinc coating for steel wires shall be in
accordance with a national standard and shall be approved by the Purchaser. All
galvanized wires on which tools have been used or cut shall be treated with approved
bit mastic paint.
All bolts and screwed rods for the connection of galvanized steel parts shall be
galvanized including the threaded portion(s) to a minimum average coating weight of
305 g/m2. The threads of all bolts and screwed rods shall be cleared of spelter by
spinning or brushing. A die shall not be used for cleaning the threads unless specially
approved by the Purchaser. All nuts shall be galvanized with the exception of the
threads that shall be oiled.
P a g e | 24
White rust formation subsequent to galvanizing must be inhibited using an approved
inhibitor applied according to the manufacturer's instructions. Material on which
galvanizing has been damaged shall be re-dipped unless, in the opinion of the
Purchaser the damage is local and can be repaired by applying a coat of galvanizing
repair paint where such repair is authorized, the damaged area shall be cleaned by
wiping with clean rags saturated with mineral spirits "or xylene followed by wire
brushing. After wire brushing, the area shall be re-cleaned with solvent to remove
residue and shall be given a minimum of two coats of zinc rich paint in accordance
with the manufacturer's instructions. Such painting shall be applied as soon as possible
and in no case more than 4 hour after the surface preparation.
INSULATING OIL AND GAS
All electrical equipment requiring insulating oil or other insulating or gas shall be
furnished with the first filling including flushing, if required. An excess of 10% of the
net amount of oil or liquid required for each component shall also be furnished by the
Supplier as spare.
The insulating oil shall not contain matters that are not biodegradable such as PCB, etc.
The Supplier shall endeavor to employ, as far as practicable, one type and make of
insulating oil only for all the electrical equipment.
SF6 gas shall comply with the requirements of IEC 60376. The high pressure cylinders
for shipment and storage of the SF6 gas shall comply with the applicable national
regulations.
All the necessary pipes, couplings, flexible tubes and valves for coupling to the
switchgear for filling or evacuating all the gases or oil to be used, with all necessary
instructions for the storage of this equipment, shall be provided.
P a g e | 25
ALUMINUM AND ALUMINUM ALLOYS
Aluminum shall be of high commercial quality. The composition, including the
percentage and nature of any impurities, shall be stated in the Schedules. All aluminum
alloys shall be of approved compositions as stated in the Schedules. Aluminum and alloy
castings shall be sound and free from air pockets and pinholes.
BOLTS, STUDS, NUTS, SCREWS, WASHERS, ETC
All bolts, studs, nuts, etc. shall have a standard metric threading and conform to the
relevant standards as regards shape and tolerance. They shall be marked with the
manufacturer's symbol and class of strength.
Bolts and nuts for electrical connections shall preferably be of brass M6 size.
Alternatively size M5 may be used, but these must be of stainless steel, phosphor bronze
or high tensile brass.
All bolts, studs, nuts, washers, screws, etc., above 10mm diameter, if not in stainless
steel or other corrosion-resistant material, shall be hot-dip galvanized, except for bolts
above Strength Class 8.8. In this case, corrosion-resistant material will be required.
Bolts, etc., smaller that 10mm diameter shall be electrolytic zinc-coated if not provided
in stainless steel or other corrosion-resistant material.
Bolts, nuts, studs and screws that require frequent tightening and unbolting during
inspection or maintenance procedures shall be of stainless steel.
All bolts and nuts shall be hexagonal, either normally or of the round head socket type
and secured in an approved manner against becoming loose during operation.
Bolts shall not protrude more than four treads or 10 mm beyond the nut (except for
terminals) but not less than two full threads.
NAMEPLATES AND SIGNS
All equipment shall be clearly and permanently labeled in English, to the approval of
P a g e | 26
the Purchaser. Where labels are provided for making clear the method of operation of
equipment they shall be concise and preferably diagrammatic in form.
All outdoor nameplates and signs shall be made of non-corrosive weatherproof material
as trafolyte, aluminum or stainless steel.
Danger labels shall have red lettering on a white background. All other labels shall have
black lettering on a white background.
Before production of labels and notices the Supplier shall submit to the Purchaser full
scale drawing of the proposed labels
DESIGN AND CONSTRUCTION
5. GENERAL REQUIREMENTS
The Contract Supplies shall be designed to facilitate inspection, cleaning and repairs
and for operation, in which continuity of service is the first consideration. All apparatus
shall be designed to ensure reliable and safe operation under the atmospheric conditions
prevailing at the Site and under such sudden variations of load and voltage as may be
met with under working conditions of the system, and short circuits, including those due
to faulty synchronizing, within the rating of the apparatus. The general operating
conditions are given in this specification.
In no part of the equipment, including busbars, connection, isolators, fuses, contacts and
cable boxes shall the temperature rise exceed the values specified in the relevant IEC or
equivalent Standards.
Corresponding parts liable to renewal shall be interchangeable. When required by the
Purchaser, the Supplier shall demonstrate this quality. All apparatus shall operate
without undue vibration and with the least practicable amount of noise.
Means shall be provided for the easy lubrication of all bearings and where necessary, of
P a g e | 27
any mechanism or moving part. Grease lubricators shall be fitted with hexagon nipples.
All mechanisms shall, when necessary, be constructed of stainless steel, brass or
gunmetal to prevent sticking due to rust or corrosion.
All taper pins used in any mechanism shall be of the split type. All connections and
contacts shall be of ample section and surface for carrying continuously the specified
full load currents without undue heating and shall be secured by bolts or set screws of
ample size fitted with locking devices of approved type and material.
All rubbing or wearing surfaces shall be machine surfaced. Joints employing a gasket
material shall be so constructed that the packing is maintained under sufficient
compression in all parts so that an efficient joint can be made without the use of jointing
compounds. Gasket material shall be of the minimum thickness necessary and have
approved composition.
All apparatus shall be designed to exclude vermin and insects from entering the
equipment
All outdoor apparatus including bushing insulators and fittings shall be designed so that
water cannot collect at any point.
6. ERECTION MARKS
All Plant equipment that requires assembly at Site shall have distinguishing marks on it
to facilitate erection and to identify the material in relation to drawings, material lists or
shipping documents. All marks shall be legible and easily visible. Where relevant,
erection marks shall be stamped before galvanizing and shall be clearly visible after
galvanizing.
P a g e | 28
7. SWITCHBOARDS AND PANELS
Switchboards as well as distribution, control, relay and metering boards and panels shall
be of robust free-standing construction, formed of a steel frame and covered with smooth
steel plate. The steel plate shall be properly stiffened to prevent distortion.
All cabinet shall be touch proof (IP2X) when the doors are opened. Safe replacement of
fuses shall be possible without risk for arching or use of special tools, the replacement
shall preferable be possible with an integrated load breaker/fuse holder making fuse
replacement possible only in de energized state or by insulated fuse cowers with load
breaking capacity.
Outdoor cabinets shall be dust and water proof (IP54) and provided with thermostat
controlled heaters to inhibit collection of moisture. The heater must be arranged not to
overheat any cables or equipment. Openings for drainage of condense shall be provided
at the lowest point in the cabinets.
The frames of the boards shall be designed to permit firm anchoring on the floor and
easy erection.
All contactors or relay coils and other parts shall be suitably protected against corrosion.
The Supplier's supply shall include all necessary mounting brackets, framing,
foundation bolts and respective embedded metal, if required, to permit proper
installation of the boards.
All terminals and all equipment shall be accessible without dismantling other
components.
P a g e | 29
8. WIRING AND TERMINAL BLOCKS
All wiring shall be stranded conductor; PVC insulated suitable for operation at voltages
below 1000 V in compliance with the provisions of the applicable IEC
Recommendations. Conductors shall not be smaller than 2.5 mm2 for current
transformer circuits and 1.5 mm2 for all other control circuits. The selection of
conductor sizes for current transformer circuits shall be supported by calculations.
For wiring within boards the "bunch" pattern shall be adopted. For a small number of
connections, wiring may be grouped using flexible plastic bands or equivalent. For a
large number of connections a system using support strips or U-shaped troughs (with
covers) shall be used. The latter principle arrangement shall apply for cable distribution
racks.
It shall be possible to work on small wiring for extension, maintenance or test purposes
without making a switchboard dead.
All cables control wiring and terminals shall be marked in a systematic manner, both on
the drawings and on the cables, wires and terminals themselves. The markings shall be
in accordance with a system presented and co-ordinate by the Supplier and the
Purchaser. The cable marking shall be fire proof.
All wiring shall terminate at terminal blocks. The latter shall be of the molded type and
provided with barriers to separate power from control cables. It shall be possible to
replace a single terminal block without dismantling a whole row. Where appropriate,
terminal blocks shall be equipped with facilities for testing, such as short-circuiting,
separating, plugging in, etc. Terminal blocks shall be located at least 300mm from the
bottom of the panel and shall be easily accessible. They shall be clearly marked the
designations being those entered in the respective wiring diagrams.
P a g e | 30
Terminal blocks using screws acting directly on the wire (conductor) as well as spring
type terminal blocks are not acceptable. To avoid squeezing of the wire the screw
pressure shall be applied by a pressure plate having smooth edges.
Only one conductor shall be connected to each side of a terminal block and the branch-
offs shall be made by interconnecting the necessary number of neighboring blocks by
means of copper strips, unless otherwise approved by the Purchaser.
P a g e | 31
IV) PARTICULAR TECHNICAL SPECIFICATIONS
This Section covers the particular technical requirements of the medium (24 and 36kV)
and low (400V) voltage equipment to be procured under this contract. By conflict
between the general specification and the particular specifications below the particular
specifications prevail.
Medium Voltage Cable
The conductor shall be covered with:
Conductors as specified in .1.3. To be with swelling powder to prevent axial ingress of
water along the conductor
An extruded semi-conducting layer
A layer of dry vulcanized cross-linked polyethylene (XLPE) insulation
An extruded vulcanized semi-conducting layer
A layer of swelling tape to prevent axial ingress of water along the screen
A layer of earthing screen of stranded copper, connection between copper and
aluminum
A layer of longitudinal aluminum to prevent water break-through
A black outer LDPE (low density polyethylene) sheath that is laminated to the
longitudinal aluminum, for water tightness and mechanical protection.
Conductors
All conductors shall be stranded copper or aluminum as specified in the Schedules. The
conductor shall be clean, uniform in size, shape and quality, smooth and free from scale,
spills, splits, sharp edges and other harmful defects.
They shall be circular, shaped, stranded, bunched and multiple stranded, as required, to
suit the cable specification and shall comply with the requirements of IEC 60228 where
applicable.
P a g e | 32
Where joints are permitted in individual wires, formed into a conductor, they shall’ be
made in the manner prescribed in the appropriate standard and the frequency shall
conform to the limiting dimensions stated therein. No joints shall be made in the
conductor after it has been formed.
Conductor Screening
Conductor screening shall be employed at rated voltages above 1.8/3.0 kV for cables
insulated with XLPE, and shall consist of a layer of extruded semi-conducting material
having a smooth even surface in intimate contact with the cable insulation and the
conductor, but easily strippable from the conductor surface.
Insulation
Power cables shall be insulated with one of the following materials EXCEPT where the
type of cable is definitely specified in detail in the Schedules:
Cross-linked polyethylene (XLPE) for 24/36 kV cables.
Only dry processes shall be used in vulcanizing and cross linking of the XLPE
insulation. Special precautions shall be taken to avoid ingress and spreading of moisture
and development of water-treeing. The Bidder shall documents the construction
measures used to achieve these requirements. The Supplier can purpose an alternative
treatment to prevent the possibility for treeing.
Core Screening
Core screening shall be employed at rated voltages above 1.8/3.0 kV for cable insulated
with XLPE, and shall consist of a layer of semi-conducting material having a smooth
even surface in intimate contact with the cable insulation and a concentric screen of
P a g e | 33
copper wires and tape applied overall. Full details of the method used for stripping the
screen shall be provided with the Tender.
Identification of Cores
The cores of all twin, three and four core power cables shall be identified by numbers
or colors in accordance with IEC standard or approved National Standard.
Laying-up and Fillers
The cores of all twin and multi-core cables shall be laid-up together with suitable fillers,
wormed circular and binding tapes applied overall.
The fillers for XLPE cables shall be non-hygroscopic. The direction of lay of the cores
shall be right-hand for all twin and multi-core power cables. The term "right-hand" has
the same meaning as for screw threads. All cables shall be circular.
Manufacturer's Identification
The manufacturer's identification shall be provided on outer sheath throughout the
length of the cables by means of a tape under the sheath printed with the manufacturer's
name. Alternatively the manufacturer's identification may be embossed on the outer
PVC sheath together with identification and voltage markings. The cables shall be
marked for each meter.
Testing
Notwithstanding that cables are manufactured to an approved National Standard all
cables, accessories and materials shall be subjected to and withstand satisfactorily the
test requirements detailed in this specification subject to any exceptions stated therein.
All materials shall withstand such routine tests as are customary in the manufacture of
the cables and Accessories included in the Contract.
P a g e | 34
Routine tests of XLPE cables and accessories
Routine tests shall be carried out on completed cable lengths of PVC or XLPE insulated
power cables in accordance with IEC 60502 and supplements, and shall include the
following:
PD measurement test (XLPE insulated cables only)
High-voltage test of main insulation
Electrical test of over sheath
Visual inspection
Special Tests
The Supplier shall carry out the special tests detailed in IEC Recommendation Nº 60502
and supplements as appropriate to the type of cable under test, and shall include the
following:
Conductor examination
Check of dimensions
Electrical test for cables of rated voltage above 3.6/6 kV
Hot set test for XLPE insulation
Tests at low temperature for PVC
The test shall carry out in presence of two engineers from PETL Co
Type Tests
The Supplier shall carry out the type tests detailed in IEC Recommendation No. 502
(1978) and supplements as appropriate to the type of cable under test.
P a g e | 35
These type test requirements may be waived on production of documentary proof that
samples of similar cable manufactured in the same works with the equivalent or larger
conductor section have passed identical or more onerous tests which have been
witnessed by an approved electricity authority or their duly appointed representatives.
Failure by the Supplier to provide such documentary proof in advance of cable
manufacture commencing will render the Supplier liable to carry out the full type test
program in entirety.
The test shall carry out in presence of two engineers from PETL Co
Conductors shall be tested in accordance with the following requirements:
Samples
Samples of individual wires shall be taken from each length of conductor before
stranding and a sample from each length of finished conductor shall be taken at the
option of the Engineer.
Failure
If a sample should fail, a second and third sample shall be taken from the same length
and if one or other of these additional samples fails under tests, the entire length of
conductor from which the sample wires are taken shall be rejected.
Tensile Tests
Tensile tests shall be carried out as detailed in the relevant Standard.
Wrapping Tests
Wrapping tests shall be carried out as detailed in the appropriate Standard.
P a g e | 36
Resistance Tests
Tensile tests shall be carried out as detailed in the appropriate Standard.
Test standard: IEC60230 & IEC60502-2 & IEC60811
Test on 600/1000 V Concentric Neutral Earth Cables
The Supplier shall carry out the tests detailed in the approved Specification.
After laying tests:
DC voltage test of oversheath
AC voltage test of main insulation
Sealing and Drumming
The cable shall be wound on strong non-returnable drums arranged to take a round
spindle of a section adequate to support the loaded cable drum during installation and
handling. The drum shall be lagged with strong closely fitting battens that shall be
securely fixed to prevent damage to the cable. Wooden drums shall be constructed of
seasoned timber to prevent shrinkage of drums during shipment and subsequent storage
on site. Each drum shall be clearly marked in a manner which cannot be obliterated with
the particulars of the cable including voltage, length, conductor size, number of cores,
type of protective covering, section number, gross and net weight, together with the
direction for rolling.
The ends of cables shall be suitably sealed to prevent the ingress of moisture. The end
of the cable left projecting from the drum shall at all times be securely protected against
damage by mishandling during transport or storage.
Drum lengths of cables shall not exceed the following:
P a g e | 37
24 and 36 kV, 1-core cables, maximum length 1000m
Current Carrying Capacity and Design Parameters
The maximum continuous current carrying capacity and maximum permissible
continuous conductor temperature, and the factors for determining such rating and
temperature shall be based on IEC Recommendation Nº 287 and subsequent
amendments and all conditions prevailing on the Site.
Cable Joints and Terminations
The Tender shall submit with his Tender drawings showing the types of joints proposed
for each of the cables included in the Contract.
The joints shall be of a watertight, "pull-over" heat shrink type, without molding, free
from sharp points or ridges, thoroughly clean internally and externally. The sleeves shall
be of sufficient diameter and length to permit color-to-color jointing without undue
bending, handling or deformation of the cores.
Terminations
Detailed drawings showing the types of cable sealing ends, terminal boxes and glands
and overhead line terminations shall be submitted to the Purchaser for approval. Stress
cones or other approved means shall be provided for grading the voltage stress on the
core insulation of screened cables.
Terminations for all HV or MV cable shall be of an appropriate heat shrink design
incorporating a suitable arrangement of stress control, and rain-sheds for outdoor use
Termination kits shall include suitable heat shrink tubing to effectively shroud, seal and
insulate the exposed cable conductor and connector, and shall include a heat shrink
glove to effectively seal the crutch of the cable to prevent ingress of moisture into the
interstices of the cable. Suitable arrangements shall be provided to earth the cable screen
P a g e | 38
and armor.
Terminations into cable boxes shall include brass compression glands and back nuts of
the correct size, which shall secure the cable outer sheath and ensure effective electrical
continuity between the cable armoring wires and the metal enclosures on which the
cable is terminated. At all rising terminations the cable inner sheath shall pass through
the gland to terminate not less than 6 mm above the gland.
Provision shall be made for earthing all sealing end base plates, cable boxes, glands and
armor clamps.
Instructions
As soon as possible after the commencement of a contract and before materials are
dispatched, copies of the jointing and termination instructions applicable to the joints,
sealing ends and terminations to be supplied shall be submitted in English to the
Purchaser for approval, together with details of the physical and electrical characteristics
of the filling medium proposed.
Materials
Sets of jointing materials for terminating cables shall be complete with all miscellaneous
jointing materials to complete the termination. One set of materials shall be sufficient
for terminating one end of the cable or cables specified into one joint box. Each set of
jointing materials shall be packed as one complete self-contained unit package.
Heat Shrink Materials
Heat shrink tubing and molded parts shall be flexible, flame retardant, polyolefin-based
material of electrical insulating quality, and shall be obtained from an approved
manufacturer. They shall be suitable for use indoors or outdoors in the conditions
prevailing on site.
P a g e | 39
Each part shall bear the manufacturer's mark, part number and any other necessary
markings to ensure correct identification for use on the correct size and type of cable.
Each set of parts shall be packed as one unit with fill and complete installation
instructions and clearly marked to show the application.
The material shall reduce to the predetermined size and shape when heated above 120ºC.
The components shall also be provided with an internal coating of hot melt adhesive
compound that shall not flow or exude at temperature below 85ºC. All parts and
materials shall be tested to a program of tests to be agreed with the manufacturer.
1. SELF SUPPORTED AERIAL BUNDLE CABLES (ABC CABLES)
General
The Aerial Bundle Cable shall be 600/1000 V grade cross-link polyethylene and shall
be of the types and construction stated in the Schedules. All cables shall be
manufactured and tested to the CENELEC HD 626. Cables shall be designed for a
maximum continuous conductor temperature of 90ºC and for operation on a system with
the neutral solidly earthed.
The cable shall be of neutral messenger type.
Conductors
The conductors shall be hard drawn stranded aluminum and shall comply with all the
requirements of EC 60228.
Insulation
The materials used in the manufacture shall be black weather-resistant cross-
linked polyethylene with a high resistance to ultra violet radiation. The insulation
P a g e | 40
shall fit closely on but shall not adhere to the conductors.
Cable Identification
An approved method of identifying the manufacturer and year of manufacture
shall be provided throughout the length of all cables.
Core Identification
Identification of individual cores of the cable shall be by longitudinal ridges on
the insulation and shall be provided throughout the length of all cables.
Testing
All cables, accessories and materials shall be subjected to and satisfactorily
withstand the test requirements specified herein. All materials shall withstand
such routine tests as are customary in the manufacture of the cables and
accessories included in the Contract.
Sealing and Drumming
The cable shall be wound on to a strong non-returnable drum with enclosed
flanges and barrel arranged to take a round spindle of a section adequate to
support the loaded cable drum during installation and handling. The drum shall
be lagged with strong closely fitting battens, which shall be securely fixed to
prevent damage to the cable. Wooden drums shall be constructed of seasoned
timber to prevent shrinkage of drums during shipment and subsequent storage
on site. Each drum shall be clearly marked in a manner that cannot be obliterated
with the particulars of the cable, including voltage, length, conductor size,
number of cores gross and net weights, together with direction for rolling.
The ends of the cables shall be sealed by enclosing them in approved caps, tight
fitting and adequately secured to prevent the ingress of moisture.
The end of the cable left projecting from the drum shall at all times be securely
protected against damage.
P a g e | 41
MV OVERHEAD LINE MATERIALS
2. CONDUCTORS AND ACCESSORIES
Standards
Aluminum clad steel reinforced aluminum conductor (ACSR/AW) aluminum alloy
conductor (AA) and copper conductors shall comply with IEC standards or such
other equivalent recognized national standard which the Bidder shall define.
Manufacture of ACSR and Aluminum Conductor
The manufacture of the ACSR/AW and AA conductor shall be carried out in a
portion of the works specially set aside for such purposes. Precautions shall be
taken during the manufacture and storage of ACSR conductor to prevent the
possibility of contamination by copper or other materials that may adversely
affect the aluminum. In the event of any machinery used for conductor
manufacture being used for materials other than aluminum or steel strand the
Supplier shall furnish the Purchaser with a certificate that the machinery has
been thoroughly cleaned before use on aluminum or steel wire and the conductor
supplied under this Contract is free from contamination.
The aluminum shall be of the highest purity commercially obtainable and the
Supplier shall submit certificates of analyses giving the percentage and nature
of any impurities in the metal of which the aluminum wires are made.
There shall be no joints in steel wires forming the core of composite conductors,
excepting those made in the base rod or wire before drawing, unless the core
consists of seven or more wires. In the latter case joints in individual wires are
permitted, additionally to those made in the base rod or wire before drawing,
but no two joints shall be less than 15 m apart in the complete steel core.
The steel strands shall be performed so that they remain inert and do not move
relative to each other when the conductor is cut.
P a g e | 42
The steel core wires shall be uniformly covered with approved grease. In addition
the inner aluminum wires shall be similarly treated. The grease shall fill all
internal spaces except that excess grease shall be removed from the conductor
before the application of the final layer of wires.
The outermost layer of all conductors shall be stranded with the right-hand lay.
Mechanical Properties
a. Steel Core
The steel core shall be comprised of stranded aluminum covered steel wire in
accordance with ASTM B-416, Concentric-Lay-Stranded Aluminum-Clad Steel
Conductors. The covering on each individual wire shall achieve a continuous
dependable weld with the steel core and shall provide a uniform guaranteed
minimum thickness of aluminum of 10 percent of the wire radius. The zone of
diffusion shall be clearly defined.
b. Grease
The grease to be used in the conductor shall be chemically inert, shall not flow
within nor exude from the conductor when at a temperature of 90ºC nor shall
its characteristics be impaired after heating to 20ºC above its drop point for
150 hours. The grease shall be suitable for service temperatures in the range
-10ºC to +75ºC. The suitability of the grease shall have been proven by tests
acceptable to the Purchaser.
c. Conductor Characteristics
The conductors shall have the mechanical and physical properties
approximating to the details given in this technical specification. The actual
characteristics are to be set out in the Technical Schedules.
ACSR/AW Conductor
P a g e | 43
Code Name Unit DINGO COYOTE RABBIT DOG
Equivalent copper area mm2 97.9 80.7 32.3 64
Overall diameter mm 16.75 15.89 10.05 14.2
Stranding Aluminum Nº/mm 18/3.35 26/2.54 6/3.35 6/4.72
Steel Wire Nº/mm 1/3.35 7/1.91 1/3.35 7/1.57
Maximum d.c. resistance at 20°C Ω/km 0.1815 0.2187 0.5426 0,273
Nominal breaking load kN 35.7 46.4 18.3 32,7
Weight kg/km 506 522 214 390
Stranded Copper Conductors
Conductor Type Copper
Nominal Cross-sectional area 35 mm2
d. Conductor Drums
General
Conductor shall be supplied on drums of sufficient sturdiness to withstand
shipment and transportation, and the drums shall be securely battened to
prevent damage to the conductor. Each drum shall be marked with the type,
size and length of conductor on the drum, and with the direction of rolling.
Conductors shall be supplied in lengths as long as can be conveniently
handled, and placed only on drums appropriate to its particular size.
The Bidder shall submit with his Bid, drawings showing the general details
and dimensions of the drums to be offered for approval.
Materials
All wooden components shall be manufactured from sound defect-free seasoned
P a g e | 44
softwoods and suitable for prolonged storage without deterioration. The wood
shall be planed or finely sawn to facilitate accuracy in assembly and clear
stenciling. The thickness of the boards of each ply or component part shall be of
reasonable uniformity.
Design
The flanges of drums shall be constructed from two plies of wood, laminated in
such a manner as to give cross grain to each other. The boards shall be close butted
to provide maximum support. Fastening of the flanges shall be with suitable bright
nails with the heads countersunk on the inside of the flange.
A flange conductor hole of sufficient diameter for the free passage of the
conductor shall be cut in one flange. A suitable sheet metal plate shall protect the
exposed end of the conductor.
The spindle hole shall be round and cut through the center of the board of each
flange ply. The spindle holes, of not less than 80 mm diameter, shall be reinforced
by a 6 mm mild steel plate bolted to each flange.
The drum barrel shall be of the segmental type, with supports and cross struts.
The barrel lagging shall be closely butted and shall provide a smooth external
surface to the conductor. The barrel and flanges shall be securely clamped
together.
Drainage holes shall be provided through each flange as close as possible to the
underside of the barrel lagging.
Circumference battens shall enclose the conductor space completely. They shall
fit flush with the outer flanges. Battens shall be securely fixed in an approved
P a g e | 45
manner.
End Fixing of Conductors
The inner end of the conductor shall be brought through the drum flange and
secured by staples. The outer end shall also be secured to the inner face of the
flange in a similar manner.
Protection of Conductors
The drum barrel shall be covered with a layer of waterproof sheet plastic or wax
paper or in the case of aluminum conductors shall be painted with aluminum flake
paint. The inner cheeks of the drum shall be painted with a bitumen-based paint
or in the case of aluminum conductors with aluminum flake paint. The outer layer
of conductor on the drum shall be covered by a layer of sheet plastic or waxed
paper secured immediately under the circumference battens so that it is not in
contact with the conductor.
All bolts and nuts on insulator string fittings shall be galvanized as specified and
shall be locked in an approved manner.
ADSS Fiber Cable
Purpose and Scope
This specification sets out the requirements for the manufacture, testing and
delivery of optical fiber cables for use on the electricity transmission network in
a totally exposed environment.
Items covered by this technical specification, are listed as follows:
P a g e | 46
ITEM ITEM DESCRIPTION
No.
All Dielectric Self Supporting (ADSS) Overhead Optical Fiber Cable:
1 Single Mode 12 Fibers – Short Span (0 – 150m)
2 Single Mode 36 Fibers – Short Span (0 - 150m)
3 Single Mode 48 Fibers – Short Span (0 - 150m)
4 Single Mode 96 Fibers – Short Span (0 - 150m)
References
Applicable Standards
The optical fiber cables shall be designed, manufactured and tested in accordance
with the relevant parts of the following Standards and all amendments issued from
time to time except where varied by this specification.
STANDARD TITLE
AS/ACIF Requirements for Customer Cabling Products.
S008:2006
ITU Characteristics of a Single-Mode Optical Fiber Cable (Zero Recommendation Water Peak)
G.652
ANSI TIA-598C Optical Fiber Colour Coding
AS 1049 Telecommunications Cable – Insulation, Sheath & Jacket.
AS 2857 - 1986 Timber drums for insulated electric cables and bare conductors
AS 3983 Metal drums for insulated electric cables and bare conductors
ISO 9002 Quality systems - Model for quality assurance in production,
installation and servicing
Drawings
There are no drawings attached to this specification.
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Environment
Aerial optical fiber cables will be exposed to the following environmental conditions:
DESCRIPTION CONDITION
Temperatures Not exceeding 45oC as determined by a shaded
thermometer (Summer day time)
Minimum -5ºC (Winter night time)
Solar Radiation Level 1100 watts per square meter with high ultraviolet
content
Precipitation Tropical summer storms with gust wind speeds above 160km/h and an annual rainfall in excess
of 1500mm
Atmospheric classifications Areas of coastal salt spray and / or industrial pollution with equivalent salt deposit densities in
the range of 2.0 – 3.0 g/m2 Design and Construction
General
Metal Free
The offered cables shall be completely metal free and shall comply with the
product approval requirements of AS/ACIF S008:2006.
5.1.2 Standard product range
It is preferred that the cables be part of or become part of the standard product
range produced by the manufacturer.
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5.1.3 ITU-T Recommendation The optical fiber cable as specified shall have single mode optical fibers in
accordance with ITU-T Recommendation G.652.
5.1.4 Outside diameter – Short span The outside diameter of the ADSS Short Span cable shall be between 14mm and
14.99mm.
5.1.5 Outside diameter – Long Span The outside diameter of the ADSS Long Span cable shall be between 18mm and
18.99mm.
5.2 Optical Fiber Requirements
5.2.1 Fiber Type The optical fibers will be single mode fibers with the following characteristics.
5.2.2 Fiber Characteristics
Single Mode: The characteristics of each single mode optical fiber in the optical fiber cable will
adhere to the ITU-T’s recommendation G.652 and as follows:
Transmission wavelength 1310 nm and suitable for 1550 nm
Mode field diameter 9.2 +- 0.4 m at a transmission
Wavelength of 1310 nm.
Attenuation Not greater than 0.40 dB/km at an optical wavelength of 1310 nm and
0.30 dB/km at 1550 nm
Point Discontinuity Not greater than 0.1 dB at 1310 and
1550 nm.
Cable Cut-off Wavelength < 1260 nm
Zero dispersion 1312 +/- 10nm
Dispersion Slope at Zero dispersion ≤0.093ps/(nm2-km)
Wavelength
Optical cladding diameter 125 m 1.0 m
Life span Greater than 35 years
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5.2.3 Fiber Coatings The secondary coating is required to be a tight UV Acrylate coating and shall be
easily removed by mechanical means for jointing purposes. Preference is likely
to be given to fibers, which have a primary buffer coating of 250 15 micron low
modulus UV, cured
Acrylate material. Thus Tenderers are encouraged to offer prices for totally UV
cured Acrylate coated fibers where possible. Tenderers may offer more than one
primary, buffer coating material. In such cases Tenderers should provide as much
information as possible regarding the physical, mechanical, and transmission
performance of such fibers, with particular regard to the relative susceptibility to
hydrogen degradation compared with UV Acrylate coated fiber.
5.2.4 Identification of Individual Fibers
The colours of individual fibers and tubes as well as other cable components shall
allow for the unique identification of individual fibers within the cable and shall
be in accordance with AS/ACIF S008:2006.
5.2.5 Factory Joints The fibers shall not be jointed within any un-installed cable length without prior
approval by the Purchaser. Where such approval is given, there shall be a
maximum of one (1) joint allowed in any continuous length. This joint shall have
a two way average splice loss of less than 0.2 dB at 1310 nm and 1550 nm.
5.2.6 Point Loss in Un-Installed Cable
For the un-installed optical fiber cable there shall be no point loss (of any cause)
in any single fiber, whose average two way attenuation exceeds 0.01 dB at 1310
nm and 1550 nm.
5.3 Cable Requirements
5.3.1 Moisture Exclusion
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As the cable may be subjected to total water immersion, the cable shall comply
with the requirements for water penetration specified in Clause 25, Method –F5B
of IEC60794-1-2 to prevent the ingress of moisture and other impurities to the
optical fibers.
Dry core water blocking techniques shall be used for all cables.
5.3.2 Cable Configuration
The configuration of the cable shall be such that it is arranged in tubes of twelve
(12) fibers. Filler tubes will be used as required.
5.3.3 Cable Sheathing
The cable sheath shall consist of material compatible with the hauling of cable
through ducts and shall be resistant to insect and termite attack.
The cable sheath shall be resilient to ageing and embrittlement from heat and
ultraviolet radiation such that the life expectancy of the cable is a minimum of 35
years.
The entire cable shall consist of electrically insulating material.
Distance markings shall be provided on the cable (in meters) in order to assist
possible fault location in the future.
A cable number and “PETL” name shall be provided on the cable. Long Span
ADSS cable shall be marked with the words “LONG SPAN”.
The markings are to be legible and indelible and shall not reduce the effectiveness
of the cable in resisting insect and termite attack.
5.3.4 Cable Design
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The cable is to be of non-metallic construction.The cable will incorporate a
strength member of glass reinforced plastic or equivalent.
The optical fibers shall not be constrained firmly against other fibers, strength
members, moisture barrier compound or any other cable components in order that
the fiber strain is de-coupled from the strain in other components when the cable
is under tension.
The preferred construction type is "Loose Tube".
5.3.5 Cable Mechanical Requirements
The cable must be able to withstand a directly applied long term crush loads of 1
kN per 100 mm without increase in optical attenuation for any fiber or any
decrease in the integrity of the optical fiber cable over its designated lifetime. Test
method as per IEC 60794-1.
5.4 Drawings Tenderers shall provide detailed drawings of the cross-section of the items
offered.
6. Performance and Testing
6.1 Tests
6.1.1 Standards Cables shall be tested in accordance with the requirements of the relevant
Australian Standards.
6.2 Routine Test
6.2.1 Attenuation
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The attenuation of the fiber shall be tested using a 1310 nm & 1550 nm light
source at one end of the fiber and an optical level meter at the other end.
6.2.2 Continuity
Continuity shall be tested at 1310 nm & 1550 nm by measuring backscattered
light using an Optical Time Domain Reflectometer (OTDR), which is adjusted to
see the whole length of the fiber. This measurement shall be done from both ends
of each fiber.
6.2.3 Recording
The overall attenuation and the OTDR traces shall be recorded and shall form part
of the test certificates.
6.3 All Dielectric Self Supporting (ADSS) Optical Fiber Cable
6.3.1 Type Tests
6.3.1.1 Graph Tenderers shall provide a graph of cable strain versus fiber strain.
6.3.1.2 Results of Type Testing Results of type testing previously carried out on the same ADSS type offered shall
be provided at time of tendering. 6.3.1.3 Breaking Load Test
Following completion of the stress/strain test, the tension shall be increased until
breakage load and the load at which the ADSS or fitting began to yield under
tension shall be recorded.
6.3.1.4 Crushing Force Test A sample of the optical fiber core shall be subjected to a lateral crushing force,
which shall be slowly increased from zero. The transmission characteristics of the
optical fibers shall be continuously monitored. A graphical plot of transmission
loss versus lateral force shall be prepared. The lateral force shall be increased until
the change in transmission loss of the optical fibers exceeds 0.1dB, test method
as per IEC60794-1.
6.3.2 Routine Tests
The optical fiber attenuation and continuity for each fiber of each cable drum
length shall be measured and recorded prior to shipment from the manufacturing
plant. The test results shall include date of test, drum number, and drum length
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and names of test personnel.
6.6.1.1 Type Test Certificates
All type tests shall be completed and certificates submitted as part of the tender
response.
6.6.1.2 Routine Test Certificates Routine test certificates shall be submitted prior to the dispatch of the cable from
the manufacturing plant.
7. Risk Assessment
There is no requirement for manufacturer provided safety risk assessments for the
items covered by this specification.
8. Quality Assurance
8.1 Purchasers Policy It is the Purchaser’s policy to procure goods, equipment and services from sources
that demonstrate the ability to supply quality products.
8.2 Documentary Evidence Documentary evidence shall be provided concerning the level of quality system
certification associated with the Tenderer and/or Manufacturer. This
documentation shall include the Capability Statement associated with the Quality
System Certification.
9. Samples 9.1 Production Samples
When requested, production samples of each item offered shall be submitted to
assist in the evaluation of the offer.
Each sample shall be delivered freight free, suitably packaged and labelled with
the following information:
Name of Supplier and this Contract No.
Contract Item Numbers
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Any supporting data on features or characteristics
10. Packaging and Marking
10.1 General
10.1.1 Damage Free It is the appointed supplier's responsibility to ensure that the fiber optic cable is
delivered on site damage free. Storage, packaging, delivery to site and all other
aspects of cable protection are the responsibility of the Tenderer.
10.1.2 Drum standards Optical fiber cables may be supplied on either timber drums or steel drums
complying with the requirements of AS 3983. 10.1.3 Standard for Timber Drums
Operational difficulties are anticipated with the use of cable drums manufactured
in accordance with AS 2857-1996. Hence this specification is based on cable
supplied on timber drums manufactured in accordance with the requirements of
superseded standard AS 2857-1986. 10.1.4 Drum sizes
Optical fiber cables shall be supplied on drum sizes and in the lengths as detailed
in Appendix A.1 to this specification. 10.1.5 Length
The cable shall be in one (1) length on each drum.
10.1.6 Winding The cable shall be wound in such a way as to preclude the possibility of chafing
or damage to the cable during winding and transport. The winding tension shall
be as low as possible, being only as high as that required to minimize movement
of cable between adjacent layers.
10.2 Lagging The cable shall be protected by external lagging to ensure that it is delivered undamaged
giving due consideration to the methods and distance of transportation and handling.
Sheet form wrapping alone is NOT acceptable.
10.3 Drum Durability
All drums must be of suitable quality and robustness to withstand a minimum of months
twenty-four (24) exposure to all types of weather conditions during outdoor storage
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without deterioration.
10.4 Drum Surface Treatment
Drum surface treatment to protect against weather, the environment, galvanic action, and
corrosion is required.
Suppliers shall state the type of surface treatment applicable to drums for each item.
10.5 Marking of Drums
10.5.1 Standard The marking of information on the cable drum shall be in accordance with Clause 16.3
of AS / NZS 5000.1. In addition, the following information shall be provided indelibly
and legibly marked directly on the flanges: a) The name PETL and the relevant stores stock code.
b) Contract number.
c) Order release authority or purchasing order number.
d) Manufacturer's traceability number – derived from Manufacturer’s first
letter, hyphen, batch number, hyphen, drum number for this batch.
10.5.2 Size and location Marking at least 25 mm high shall be located on both outside flange surfaces near the
spindle.
10.5.3 Direction of rolling Drums shall be marked with the preferred direction of rolling.
10.6 Fixing of Cable End The inner end of the cable shall be secured to the drum to ensure that the end will not
flick off the drum barrel when the cable is being run out. 10.7 Quarantine Requirements
Should the items offered be supplied from overseas manufacturers, then it is mandatory
that all conditions and inspections required by the Australian Quarantine Act be met and
that all these costs be included in the tendered price. In particular, timber crates must be
fumigated with methyl bromide with a concentration of 48 grams per cubic meter for 24
hours at 21 C. The supplier shall ensure that the procedure does not produce any
deleterious effects to the cable or the drums.
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11. Service Performance
Suppliers shall state:
(a) the period of service achieved by the items offered within Palestinian
service conditions;
(b) International electricity supply authorities who have a service history of
the items offered; AND
(c) Contact names and phone numbers of relevant employees of those supply
authorities who can verify the service performance claimed.
12. Reliability
12.1 Service Life Suppliers are required to comment on the reliability of the cables and the performance of
the materials offered for a service life of 35 years under the specified system and
environmental conditions. 12.2 Evidence in Support of Reliability
Such comments shall include evidence in support of the reliability and performance
claimed including information on Failure Mode and Effect Analysis.
13. Training
Training material in the form of drawings, instructions and/or audio visuals may be
required to be provided for the items accepted under the offer.
Tenders shall state the availability of training materials which should include but is not
limited to the following topics:
Handling Storage Application (particularly in areas of heavy coastal pollution) Installation, Maintenance Environmental performance, Electrical performance Mechanical performance Disposal
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14. Environmental Considerations
Suppliers are required to comment on the environmental soundness of the design and the
materials used in the manufacture of the items offered. In particular, comments should
address such issues as recyclability and disposability at the end of service life.
15. Information To Be Provided
15.1 Specific Technical Requirements The specific technical requirements for the items offered shall be as stated in Attachment
1 of this specification. The supplier shall provide all details requested by Attachment 1
and shall guarantee such data.
15.2 Checklist of Supporting Documentation
Attachment 2 details a checklist of supporting technical documentation which is required
to be submitted with the offer.
15.3 Fiber Information
15.3.1 Fiber Characteristics The Tenderer is required to supply the following:
(a) A graph of attenuation versus wavelength over the range of 700 nm to
1700 nm for single mode fibers. (b) A typical graph of fiber attenuation for the 1310 nm & 1550 nm
wavelength for single mode fibers for the temperature range of 5oC to 75oC.
(c) Details for the strength of the fibers.
(d) A graph of attenuation verses cable strain for each cable offered.
(e) Information on the chromatic dispersion co-efficient in ps/km/nm with
respect to zero dispersion wavelength in the region of 1310 nm and 1550
nm for single mode fiber.
(f) Information on the Dispersion Slope at Zero Dispersion Wavelength in ps/(nm2-m)
15.3.2 Fiber Performance Tenderers shall provide information regarding the physical, mechanical, and transmission
performance of fibers, with regard to the relative susceptibility to hydrogen degradation.
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15.3.3 Field Jointing
Tenderers shall provide details of their fibers performance to different jointing techniques
(including arc fusion and mechanical spicing), preferably in the form of histograms
showing minimum obtainable splice losses.
15.4 Information on Cable
15.4.1 Moisture Exclusion Full details of the water blocking compound shall be supplied by the Tenderer, including
the method of removing the compound prior to cleaving and splicing.
15.4.2 Cable Sheathing The Tenderer must include in the tender documents information detailing the design and
performance of the sheath and jacket of the cables offered to demonstrate that the cable
is adequate for a 35 year service life time. The information should include
The material used as the outer sheath. Effectiveness of resisting pest attack as described
in Clauses 4.1 and 4.2. The thickness of the outer sheath. Resistance to environmental stress cracking and thermal and ultraviolet radiation ageing.
15.4.3 Cable Design
The Tenderer is to provide details of the design of the cable. The documentation provided
will include a cross section of the cable, nominating the materials used on the drawing
and any other relevant information.
15.4.4 Material Properties
The Tenderer shall supply a full listing of the material components used in the cable with
details on toxicity and safe handling of the materials.
15.4.5 Fiber Colours Tenderers are required to supply details of the colour of fibers.
15.4.6 Fiber Tube Colours
Tenderers are required to supply details of the colour of fibers tubes
15.4.7 Vibration Testing
The Tenderer will supply results of vibration resistance tests.
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15.4.8 Service Lifetime The Tenderer will supply information to support a cable life time of 35 years for the
environmental conditions listed in Clause 4.1. Details as to potential damage to fibers
caused by cable materials with particular reference to hydrogen producing agents will
be included.
15.4.9 Sag-Strain Characteristics for Aerial Cables
The fiber optic cable must have sag-strain characteristics to enable its installation onto
existing power poles while maintaining clearances to low and high voltage mains and
statutory clearances. The Tenderer shall supply stringing chart(s) or tables showing
optical fiber strain and sag-tension information for the following conditions:
Range of spans 0-250 m in steps of 20 m.
Range of cable tensions 0-100% of the maximum recommended cable tension.
Range of temperatures
5°C to +75°C in steps of 5°C.
Tenderer to indicate the constant horizontal tension (@ 15ºC no wind).
The Tenderer shall supply details of all assumptions used in calculating stringing
chart(s) or tables.
15.5 Cable Installation Information
The Tenderer will nominate any special requirements that PETL will need to adhere to
during the installation of the fiber to ensure that the cable is installed damage free and
the lifetime of the installation is not unnecessarily reduced.
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MV DROP-OUT FUSE SWITCH
All Drop-out Fuse Switches shall be of 3 separate, single pole, vertical-mounting,
channel base pattern drop out fuse switch with fuse holder complete for erecting on
standard lattice towers and all the conductor straps, nuts, bolts, and washers necessary
to mount and electrically connect the isolators, together with all auxiliary equipment,
on their supports shall be provided
All Drop-out Fuse Switches shall be supplied complete with necessary pole coupling
rods, operating rods, operating handles and all accessories.
Contacts shall be of the high pressure, self aligning type made of metal not subject to
corrosion. The design of the contacts shall be such that periodic lubrication of their
surface is unnecessary for efficient operation under the atmospheric and climatic
conditions existing at site.
The fuse switch shall have load breaking capacity and in open state fulfill the
requirements for circuit isolation (isolator function). Switching and fuse replacement
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shall be done from the ground. A number of insulated operation rods shall be supplied.
The fuse elements shall be of the current limiting double tail button head type.
MV LINE ISOLATORS AND SWITCH DISCONNECTORS
3. ISOLATORS
All isolators shall be of the triple pole, gang operated open type, suitable for outdoor
installation designed in accordance with IEC 60129. The isolators shall be for
horizontal or vertical mounting in standard lattice towers and shall be supplied
complete with base plates, pole coupling rods, operating rods, angels and triangular
plates for operating rods, operating handles and all accessories, including items such
as guide plates or mounting brackets. Facilities shall be incorporated in the design for
aligning the main contacts and adjusting the linkages during erection and maintenance,
and all the conductor straps, nuts, bolts, and washers necessary to mount and electrical
connect the isolators, together with all auxiliary equipment, on their supports shall be
provided, if are requested.
Provision shall be made for adjusting the insulator posts in the vertical axis.
Contacts shall be of the high pressure; self aligning type made of metal not subject to
corrosion.
The design of the contacts shall be such that periodic lubrication of their surfaces is
unnecessary for efficient operation of the switch. Service conditions require that
isolating switches shall remain live, and in service without being operated for periods
of up to two years. The contacts will therefore be expected to remain capable of
carrying their rated load, and short circuit currents without overheating or welding for
this period under the atmospheric and climatic conditions existing at site.
Silver plated contacts shall not be offered unless a guarantee is provided that there will
be no necessity for periodic re-plating.
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Isolators shall be designed and tested such that the isolator cannot be opened by forces
due to short circuit currents passing through it, and shall be self-locking in both the
"open" and "closed" positions.
Provision shall be included for locking the switches in either the open or closed
positions by means of padlocks that will be provided by the Purchaser.
Where "outboard" bearings are required they shall be suitable for mounting at either
end of the isolator.
All roller or ball type bearings shall be grease packed and efficiently sealed to prevent
the ingress of dust and moisture. Completely enclosed, weatherproof type bearings
that require no maintenance are preferred.
When made of steel or malleable iron, operating boxes, handles, rods, tubes and other
fittings for outdoor equipment shall be hot dip galvanized.
Bidders shall state in the Technical Schedules the load current, line charging current
and transformer magnetizing current which they guarantee that all isolators offered
will break without damage to the contacts. Bidders shall declare in their Bid whether
special contacts are required to achieve any of the current breaking conditions; details
of any such contacts shall be given.
Full details of all heavy current carrying contacts which incorporate moving parts shall
be submitted with the tender together with associated electrical and mechanical type
test reports.
Polymeric tension insulator 33 kV:
- Voltage: 33 kV
- Total length mín 585 mm
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- Max working load: 70 kN
- Breaking load: 70 kN
- Creepage distance: mín 1170 mm
4. ON LOAD SWITCH ISOLATORS (SWITCH
DISCONNECTORS)
All isolators shall be of 3 separate, single pole and shall be prepared for extension
with load breaking heads allowing breaking of minimum 630 A when operating the
isolator. The isolator functions shall be retained when the load break head is mounted.
The load interruption shall take place within the interrupter head without an external
arc or flame conforming to IEC 60265, Category A. Electronic controlled arc
interrupters are not acceptable.
The load interruption shall be achieved by providing a parallel circuit for re-directing
the load current path from the main isolator contacts at the instant of their separation.
The design of the equipment shall allow the replacement of load interrupter head after
a specified number of operations. The manufacturer shall indicate the number of load
break operation possible without changing the interrupter head.
The inner layer of the arcing chamber shall be suitable for generating arc-quenching-
gas. The generated de-ionized gas shall extinguish the arc and be dissipated through a
rear exhaust chamber, well clear of the switch.
The internal contacts shall be spring loaded and be of such design as to provide a
positive and independent tripping action.
The interrupter contacts shall not be in the main current path when the main contacts
are in a fully closed position.
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The load interrupter head shall be designed to prevent leakage of water to the arcing
chamber (where the control mechanism including the spring for opening and closing
is housed) and be made of non corrosive materials.
5. OPERATING HANDLE
Operating mechanisms shall be designed so that all three poles close simultaneously
and be arranged so that any mechanism may be mounted at either end of the supporting
structure. All operating handles shall be securely earthed.
6. REMOTE CONTROL
It shall be possible to equip the isolators and switch isolators with a motor driven
mechanism connecting to the normal operation rod. The switches must be so designed
that such installation also can be done at a later stage. Where the motor operated
mechanism is specified it shall be designed to provide electrically initiated opening
and closing of the isolator from local or remote switches or relays. Local manual
tripping shall also be provided together with manual closing of the isolator; the manual
closing operation shall reset a spring or weight operated mechanism.
Provision shall be made for locking the local tripping device with a padlock to be
supplied by the Purchaser. The mechanisms shall be totally enclosed in weatherproof
and vermin proof metal panel with padlock hasp.
Automatic operating mechanisms shall be provided with an auxiliary switch to isolate
the trip or operating coil when the switch is opened.
Auxiliary contacts should clearly indicate the position of the switch.
7. RATING PLATE
The rating and data of the load break switch shall be engraved or embossed on a
weather and corrosion proof metal plate. The rating plate containing the following
information shall be positioned at the base supporting frame of the post insulator and
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shall be prominently visible.
a) Manufacturer's Identification (Trade Mark)
b) Country and Year of Manufacture.
c) Number and the Year of the standard adopted.
d) Designation of Type, Class etc.
e) Rated voltage and frequency (kV & Hz)
f) Rated 1 minute power frequency withstand voltage (kV) wet.
g) Rated lightning impulse withstands voltage (kV) dry.
h) Rated continuous current (A)
i) Rated short circuit making current (kA)
j) Rated short time (1 sec.) current (kA)
k) Total net weight (kg.)
l) Serial Nº CEB/LB/
8. TESTS
Equipment shall be routine and type tested in accordance with IEC 60129
LIGHTNING ARRESTER
9. DESIGN
This section covers the design, manufacture and testing of lightning arresters for
outdoor service.
The arresters shall be capable of protecting the following equipment:
Transformers which are directly connected to a line
Transformers which are connected to a line via cables
Capacitors
Cables
Circuit breakers and isolators
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Instrument transformers
The outdoor lightning arresters shall be of the metal oxide gap-less type, complying
with IEC 60099-4.
The lightning arresters shall have the following characteristics:
Description Unit Nominal voltage level
22 33
Rated voltage of arrester kV 12.7 19
Nominal discharge current (8/20 µs) kA 10 10
Class Distribution Min. protective ratio 2 2
The arresters shall be designed horizontally or vertically (standing or hanging) in
standard lattice towers. The arresters shall be supplied complete with fixing materials
and connection clamps.
The lightning arresters shall be fitted with a pressure relief device.
All arresters shall be fitted with in corrodible metal nameplates which are visible when
the arrester is completely mounted and which clearly indicate the data specified in
IEC in engraved or embossed characters.
All external ferrous parts shall be hot-dip galvanized.
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10. PROTECTION CHARACTERISTICS
This is a combination of the following:
Maximum residual voltage for steep current impulse (1/20 µs)
Maximum residual voltage for current impulses with waveform (8/20 µs) and
0.5, 1.0 and 2.0 times nominal current
Maximum residual voltage for switching impulse (30-100/60-200 (µs)
The protection level for lightening impulse is the highest of:
maximum residual voltage for steep current impulse divided by 1.15, and
maximum residual voltage at nominal current and 8/20 µs
The protection level for switching impulse is the maximum residual voltage at the
specified switching impulse current.
The protection level shall have at least a margin of safety of 30% compared to the BIL
of the arrester housing.
11. ENERGY REQUIREMENTS
The lightning arresters shall be designed to minimum line discharge class 2 according
to IEC 99-4 for heavy duty arresters.
12. HOUSING
The outer housing shall be of a silicone rubber material offering high resistance to
pollution. The specific creepage distance for any arrester shall not be less than 31
mm/kV system voltage, corresponding to heavy pollution according to IEC.
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13. TESTS
Lightning arresters offered or supplied to this specification shall comply with the tests
detailed in IEC 99-4 including wet tests and any additional tests specified. Tests shall
include requirements set out in the following:
Certified copies of type test reports shall be submitted with the bid and shall include
calibrated oscillogram demonstrating that each type of arrester offered complies with
the minimum specified requirements. The catalogue numbers applicable to each
arrester shall appear on the oscillogram. The time to spark-over applicable to each test
involving spark-over of the series gap shall be clearly shown.
Bidder should state what routine tests are carried out to prove the effectiveness of the
seals of the arresters.
Bidder should state what tests are carried out to prove the capabilities of the arresters
to withstand the effects of a multiple lightning strike.
AUTORECLOSER
14. GENERAL
The autorecloser shall be designed for pole mounting with the following features:
i. Ability to distinguish between permanent and transient/temporary faults.
ii. Ability to interrupt fault currents and thereafter restore every supply.
iii. Ability to switch normal load currents.
iv. Ability to coordinate with other protective devices such at drop out fuses,
sectionalizes and circuit breakers controlled by normal IDMTL protection
relays.
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15. MODES OF OPERATION
Autoreclosers shall be equipped to provide three phase trippings and reclosures, then
lockout after a pre-selected sequence of three phases unsuccessful reclosures.
If a reclosure is successful the operating mechanism shall re-set to make available the
full sequence of operations.
A minimum availability of four opening operations shall be provided with an
autoreclose facility on the first three, the fourth opening shall cause lockout. Once the
reclose is locked out manual resetting is required in order to restore service.
The number of fast or slow trip operations shall be adjustable between 0 and 3 by
means of an easily accessible setting mechanism.
A separate handle shall be provided which blocks reclosing after the first tripping
although manual closing shall still be possible. It shall be possible to set the recloser
to lockout after any number of opening operations.
It shall be possible by a simple setting device to select the number of operations which
the recloser will perform automatically and also the time delay which may be applied
to each individual operation independent of the other operations.
16. OPERATING MECHANISM
The closing mechanism shall be solenoid operated whereby the solenoid during
closing charges a spring which drives the tripping mechanism.
The tripping shall be coil initiated via commands from the control/protection system.
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17. POWER SUPPLY
The recloser shall preferably be completely self contained deriving all its energy from
the feeding side of the HV network. High voltage operated solenoids are preferred.
The control and protection facilities may be operated by means of current transformers
on the feeding side bushings. If batteries are provided for control, protection and
tripping batteries are provided for control, protection and tripping functions detailed
capacity calculations are to be provided showing the number of in/out operation the
battery can handle in addition to the normal control/protection requirements of the
stated ambient temperatures. A minimum of 3000 in/out operations is required with a
maintenance free 90 V Lithium battery with minimum battery life span of 10 years. A
low battery voltage signal shall be provided.
18. CONTROL CABINET
A separate control cabinet shall be provided either mounted on the recloser tank or
connected to the recloser by means of 10 meter multicore cable. The cabinet shall have
a heater for connection to external power supply. The cabinet shall be dust and vermin
proof and protected against direct sunshine by means of a shade. Ingress of water shall
not be possible.
19. CONTROL REQUIREMENTS
The ARC shall be controlled by a microprocessor control unit with integrated
protection functions. The control unit shall have a serial interface based on a IEC serial
interface standard for communication with a SCADA system via an RTU
The control unit shall have a socket for serial communication and downloading of
information to a hand-held external unit from the memory.
The autorecloser shall have facilities for manual tripping and locking out.
The following control functions shall be provided on the front panel:
P a g e | 71
local/remote control selection
closing/tripping
autoreclose in/out (one trip to lockout)
protection engaged/disengaged
earth fault in/out
sensitive earth fault in/out
relay status
Local status indications shall be included in addition to the above control functions.
The control unit shall also have facilities for remote control/indication.
20. PROTECTION REQUIREMENTS
Relay characteristics settings shall preferably be performed on the front panel as well
as selection of the operating sequence.
Dead times and reclaim time shall be selectable in steps.
The protection system shall have facilities for: phase faults, earth faults and sensitive
earth fault.
The phase and earth fault protection shall have standard inverse IDMTL
characteristics and definite time. The trip setting range for phase faults shall minimum
cover 20 to 800 A while for earth faults 10 to 400 A.
The sensitive earth fault relay shall be of the definite time type with instantaneous
element, adjustable between 2 and 10A in steps. Time delay should be settable
between 0 and 20 sees, in steps.
The relays shall be equipped with in rush restraint facilities. A counter is to be
provided to keep record of the number of in/out operations.
P a g e | 72
21. INSULATING AND INTERRUPTING MEDIUM
The interrupting medium shall be SF6. The insulating medium shall be SF6. The SF6
gas used shall comply with IEC publication 60376.
In addition to the quantity of gas required to fill the supplied equipment, 20% shall be
supplied as spare.
The supplier shall provide the user with necessary instructions for refilling the gas and
maintaining its required quantity and quality. The autorecloser shall have facilities for
lockout in case of low pressure with an associated indicator flag easily seen from the
ground. A pressure gauge easily read from the ground shall also be provided.
Reclosers using oil as interrupting medium are not acceptable and will be rejected.
Where gas filled reclosers are offered the supplier shall include in the quotation the
cost of one set of gas filling equipment. One set of gas filling equipment shall be
supplied with the reclosers.
22. RATINGS
36 kV
a) The reclosers will be used on networks with nominal operating voltages of 33
kV. The maximum system voltage will be 36 kV. The rated one minute power
frequency withstand voltage shall be at least 70 kV when contacts are opened
with Basic Insulation Level at least 170 kV.
b) The continuous current rating shall be at least 400 A. The short time 3 seconds
current rating shall be at least 8 kA. The interrupting current shall be at least 8
kA. The closing and latching capability shall be at least 20 kA.
24 kV
a) The reclosers will be used on networks with nominal operating voltages of 22
P a g e | 73
kV. The maximum system voltage will be 24 kV. The rated one minute power
frequency withstand voltage shall be at least 50 kV when contacts are opened
with Basic Insulation Level at least 125 kV.
b) The continuous current rating shall be at least 400 A. The short time 3 seconds
current rating shall be at least 8 kA. The interrupting current shall be at least 8
kA. The closing and latching capability shall be at least 20 kA
23. BUSHING CURRENT TRANSFORMERS
The bushing current transformers for protection shall be single core. They shall be
rated as follows:
As technical specification table
If current transformers are used to provide power supply to control, protection and
tripping these are to be dimensioned with 30% spare capacity. The cores for this
supply shall be separate from the protection core.
P a g e | 74
OVERHEAD LINE INSULATORS
24. GENERAL
Pin, post and reel type insulators shall be brown glazed porcelain or epoxy resin and
shall comply with the requirements of adequate IEC publications.
Tension insulators shall be either of strings of toughened glass disc insulators or
comprise epoxy resin long rod type units. The design of insulators and fittings shall
be such as to avoid local corona formation and no significant radio interference shall
be exhibited. The insulator units and the complete insulator sets shall conform to the
electrical and mechanical design criteria given in General Technical Specification of
this Specification.
25. PIN INSULATORS FOR OVER HEAD LINES
Pin type insulators for use on 33, 22 and 11 kV lines shall have as a minimum the
electrical characteristics required in Section 2 of this Specification and they shall be
fitted with galvanized mild steel spindles having a minimum failing load of 10kN.
Spindles for pilot insulators must have a minimum failing load of 700N. Conductor
sizes to be accommodated shall vary from 6.0mm to 19.0mm diameters with
Preformed Distribution Ties.
26. TENSION INSULATORS
Tension insulator sets shall be either made up of strings of toughened glass disc
insulators of 254mm diameter and fixing centres at 140mm of 16mm ball and socket
couplings, or of epoxy resin long rod type insulators of equivalent electrical and
mechanical performance.
Complete tension insulator sets, including fittings, shall have a minimum withstand
factor of 2.5 based upon the ultimate mechanical strength.
P a g e | 75
The ultimate mechanical strength of an insulator set shall be the load at which any part
of the insulator string fails to perform its function of providing a mechanical support
without regard to electrical failure.
Individual insulator units shall have a minimum safty factor of 2.5 based upon the
combined electro-mechanical strength of the insulator unit. This is defined as that load
at which any part of the insulator fails to perform its function either electrically or
mechanically when voltage and mechanical stresses are applied simultaneously.
27. MARKING OF INSULATORS
Each insulator shall have marked upon it the manufacturer's name or trade mark, the
date of manufacture or firing, and indication of the guaranteed electro-mechanical
strength and other such marks as may be required to denote each batch for the purpose
of sample tests. Unless otherwise approved the insulators submitted, as a batch for a
test shall bear the same marks.
These marks shall be imprinted and not impressed. For porcelain, the marks shall be
imprinted before glazing. When a batch of insulators bearing a certain identification
mark has been rejected no further insulators bearing this mark shall be submitted and
the Supplier shall satisfy the Engineer that adequate steps will be taken to mark or
segregate the insulators constituting the rejected batch in such a way that there shall
be no possibility of the insulators being resubmitted for test or supplied for the use of
the Purchaser.
28. PORCELAIN INSULATORS
All porcelain shall be sound, free from defects and thoroughly vitrified. The glaze
shall not be depended upon for insulation. The glaze shall be smooth, hard, of a
uniform shade and shall cover completely all exposed parts of the insulator. Insulators
and fittings shall be unaffected by atmospheric conditions due to weather, proximity
P a g e | 76
to the coast, fumes, ozone, acids alkalis, dust or rapid changes of air temperature
between minus 40°C and plus 75 °C under working conditions.
29. INSULATOR CAPS AND PINS
The caps of insulator units shall be of malleable cast iron or other suitable material
having the necessary strength to enable the complete unit to comply with this
Specification. The pins shall be made of steel or other suitable material of such quality
that the finished unit shall comply with this Specification.
The design of the unit shall be such that stresses due to expansion and contraction of
any part of the insulator shall not lead to deterioration.
The porcelain shall not engage directly with hard metal. Cement used in the
construction of an insulator shall not fracture by virtue of expansion, or loosen by
contraction and proper care shall be taken to locate the individual parts correctly
during cementing. The cement shall not give rise to chemical reaction with metal
fittings and its thickness shall be as uniform as possible.
30. FITTINGS
Ball and socket connections shall be provided with specially designed "W" clips,
which effectively locks the connection against accidental uncoupling without
detracting from its flexibility. The "W" clip shall be of stainless steel.
The design shall be such as to permit easy removal for replacement of insulator units
under live line conditions without the necessity of removing the entire string from the
crossarm. All split pins for securing the attachment of fittings of insulator sets shall be
of stainless steel and shall be backed by washers. Plated split pins shall not be used.
P a g e | 77
31. FERROUS METAL PARTS
All ferrous metal parts except those of stainless steel shall be hot dipped galvanized to
give an average coating of zinc equivalent to 610 g per sq meter.
DISTRIBUTION TRANSFORMERS
32. GENERAL
This specification covers the manufacture; testing, supply and delivery of distribution
transformers and spares.
33. GENERAL DESIGN
The transformers shall be of the mineral oil immersed core suitable for outdoor as well
as indoor use with Oil Natural Air Natural (ONAN) cooling.
The transformers shall be designed to deliver full rated power continuously on any
tapping within the specified tapping range under the following conditions:
i) With the voltage of the untapped winding at rated value, without the need to
de-rate the transformer at the extreme tap positions and without exceeding
IEC temperature limits.
ii) Shall withstand up to 10% over-voltage With voltage without injurious
overheating
iii) Regarding loading, the transformers shall be designed in accordance with
IEC 60076-7
The transformers shall be connected in accordance with IEC 60076: three phase
transformers to Vector Group reference Dyn 11.
The L. V. neutral shall be brought out of the tank to a readily accessible terminal and
shall not be earthed inside the tank, unless otherwise specified in the enquiry.
The transformers on a particular contract with similar voltage ratios and connections
P a g e | 78
shall be suitable for parallel operations on all relevant taps under which conditions
they should share the load in proportion to their ratings subject to the tolerances on
impedance laid down in IEC 60076.
Low impedance transformer are preferred, a maximum of 6% being envisaged on any
size with no plus tolerance.
Earth studs are required at both the H.V. and the L.V. ends of transformer.
34. WINDINGS
Tappings shall be provided in the H.V. windings, preferably in the electrical center of
the windings, to permit variation of the number of H.V. turns without significant
variation in the kVA rating. The variations shall be effected by means of a manually
operated tapping switch to be provided.
All windings and terminations shall be fully insulated and those for service above 1000
volts shall be designed for impulse voltage tests.
Designs shall be such that electrical stresses are as uniform as possible throughout the
windings under impulse conditions.
Windings shall be vacuum impregnated and insulating materials shall not be liable to
soften, shrink, become brittle, carbonize, deteriorate, or collapse in any way during
service.
35. CORES
The magnetic circuit shall be earthed to the core clamping structure, at one point only,
and the core assembly to the tank. Where transformers are not sealed, readily
accessible removable bolted links shall be employed for the earthing connections.
The general construction of the cores, framework and the clamping arrangements shall
be robust and such that they will be capable of withstanding completely any stresses
which may occur due to handling, transport or service. All cores and yokes shall be
P a g e | 79
terminated and clamped by means of a suitable framework. Suitable means shall be
provided for lifting the cores from the tanks.
It shall not be possible for the core to move relative to the tank during handling or
transport.
Particular attention shall be paid to maintaining low core loss consistent with sound
design using low loss grain oriented steel of best quality.
36. TAPPING SWITCHES
The transformer shall be provided with approved off-circuit type tap changing
equipment. A fully insulated off-circuit, externally manually operated ganged tapping
switch shall be supplied, capable of withstanding the specified impulse voltage when
connected to the transformer windings.
Clearly visible tap position indication shall be provided. The tapping switch shall be
operated by means of an external handle that can be positively located and locked in
each operating position.
The switch shall be mechanically robust and provided with a device between the
handle and the switch to permit operation without strain in the event of imperfect
alignment between switch and handle; the switch operating shaft shall be fully
insulated as between tank and switch and shall be provided with a suitable oil and
vacuum tight gland where it passes through the tank.
The use of wood shall be avoided wherever possible and all the supports and terminal
boards shall be completely unaffected by hot oil and non-moisture absorbent.
High grade insulating materials shall be used in the construction of tapping switches
which shall be designed with special attention to the elimination of points where
tracking is likely to occur.
Tapping switches shall be mounted on supports made of suitable high strength
insulating material and shall be provided with self-aligning spring loaded wiping
P a g e | 80
contacts capable of maintaining good electrical contact without the need for periodic
maintenance.
All clearances between tapping switch contacts and leads shall be indicated on
drawings submitted at the time of tendering and such clearances shall be sufficient to
prevent tracking or flashover in the event of carbon or sludge deposits forming on
leakage paths.
H.V. tappings: Minus 7.5% : Minus 5% : Minus 2,5% : 0% : plus 2.5% : Plus 5% : Plus
7.5%.
37. BUSHINGS
All line terminals and neutral connections where specified, shall be brought out to
porcelain outdoor type terminal bushings located on the top cover. Arcing horns shall
be fitted on all transformer bushings above 660 volt. The arcing horn flash over
distances shall be adjustable and set to 60-70 mm for 11 kV, 75-85 mm for 22kV and
130-140 mm for 33kV phase to phase voltages.
The LV Busbar shall be capable to carry 1250 A with 4 holes per phase for the 630
KVA transformers and in accordance with the attached drawing.
38. TANKS AND CONSERVATORS
General
Drain valves may be either screwed or flanged whilst conservator isolating valves shall
be flanged. Drain valves shall be complete with captive plugs that shall be either of
non-ferrous metal or galvanised.
All internal steel surfaces or tanks and conservators shall be shot blasted and cleaned,
and a coat of protecting compound, unaffected by hot oil, should be applied.
All external surfaces and parts made of steel are to be thoroughly shot blasted and
cleaned, after which two coats of priming paint, preferably of zinc chromate, one
intermediate coat and one coat of finishing paint are to be applied. The purchaser shall
approve the colour.
P a g e | 81
Transformers on which the paints are found to flake off or deteriorate within the
guaranteed period shall be suitably cleaned and repainted free of charge by the
supplier.
Tanks
Each transformer shall be housed in a tank of welded steel plate construction suitably
stiffened where necessary but with a flat base. Wheels or rollers are not required.
Each tank shall be provided with the accessories specified Table 1, the lifting lugs
called for shall be suitable for lifting the transformer bodily by means of a hoist or
crane when it is completely assembled and ready for service.
All transformers shall be provided with skid on the base.
No radiators or tube coolers shall be used. Ribbed tanks may be supplied in order to
achieve the necessary cooling under the conditions prevailing at site.
Conservators
Conservators shall be of dimensions such that oil expansion may occur over the
working range temperature from no load with the transformer cold at minus 10ºC
ambient air temperature to full load at plus 45ºC ambient air temperature while the
sump pipe remains covered and the oil level is visible or indicated.
The fittings detailed in Table 1, shall be provided on all transformer conservators.
Drain plugs shall preferably incorporate approved sampling facilities, and shall be
mounted at the lowest part of the conservator tank and so designed that the sampling
device can be readily cleared in the event of its being blocked by an accumulation of
sludge etc., without the necessity of having to dismantle the device completely.
Oil level gauges on conservator tanks shall be of the refracting plate glass or other
approved type, marked with the level at 20oC at no-load and capable of indicating the
level of oil over the specified working range.
Where dehydrating breathers are specified they shall be of the Silica gel type, which
give indication of moisture absorption by change in colour of the charge. The Silica
P a g e | 82
Gel housing shall be of the type, which provides full visibility for inspection of the
silica gel and shall be mounted in a position convenient for inspection and replacement
of the silica gel. The breather is to incorporate an oil seal to prevent contact with the
external air when breathing is not taking place. The breather to be fitted on the L.V.
end of the transformer.
Where only a vent pipe without a breather and incorporating a filling hole is specified,
it shall preferably be fitted with a cap and provided with very fine mesh non-corrodible
anti-vermin gauze.
39. ACCESSORIES AND FITTINGS
All transformers shall be provided with accessories and fittings in accordance with
Table 1, unless otherwise specified in the enquiry.
Rating and diagram plates shall be of engraved steel, brass or other approved non-
corrodible material.
Where a thermometer pocket is provided, it shall be of a thin walled metal mounted in
the tank cover.
The pocket shall project 25mm outside of the tank and shall be threaded along the
whole projecting portion, a screwed cap shall be provided to cover the pocket when
not in use.
P a g e | 83
Table 1: Accessories and Fittings for Distribution Transformers (Breathing Type).
Item Number 630 kVA
Transformer Tank Fittings units
1. Conservator Y
2. Safety Valve ( over pressure relief device ) Y
3. Drain valve with captive sealing plug Y
4. Lifting lugs Y
5. Thermometer Pocket Y
6. Rating and diagram plate Y
7. Platform mounting lugs Y
8. Earthing Terminal Y
9. Lightning arrester brackets (Arcing Horn ) Y
10. Thermometer pocket Y
11. Jacking pads required only when the mass of the
complete transformer is 1000 kg or more.
Y
12. Oil gauge ( Level Indicator ) Y
13. Mounting plate Y
14. Oil filling opening Y
15. Dehydrating breather ( Silica Gel breather) Y
16. Drain plug Y
17. Base (SKID) Y
18. Lashing down facilities Y
19. Separate filling hole with cap. Y
40. SURFACE TREATMENT AND PAINTING
Transformer and all metal parts shall be protected by one primary and two finishing
coats of appropriate paint prior to delivery. The finishing coat shall be of aluminum
colour subject to the Employer Approval.
The interior of the tank and the oil conservator shall be painted with two coats of
varnish.
Internal surface treatment of transformer and expansion tank:
Degreased, sandblasted cleaned by pressurized air and painted by varnish not
contributing to releasing of gas from the oil.
P a g e | 84
41. INSULATING OIL
The transformer shall be filled with low viscosity mineral insulating oil, which
complies in every respect with the provision of IEC 60296.
42. TESTS
A) Routine Tests
All transformers shall be subjected to the following Routine tests in accordance
with IEC 60076:
1- Measurement of winding resistance.
2- Ratio, Polarity and phase relationships.
3- Impedance voltage.
4- Load loss
5- No load loss and no load current.
6- Induced over voltage withstand
7- Separate source voltage withstand.
8- Insulation resistance.
9- Temperature-rise test.
The test shall carry out in presence of two engineers from PETL Co.
B) Type Tests
The Tenderer should submit with his offer complete Type test certificates including
short- circuit tests, according to IEC standard from an independent & international
recognized testing laboratory such as KEMA , CESI for Transformers as an evidence
of his capability to manufacturer such materials.
The supplier shall perform a complete Type test on one transformer of size 630 KVA
of the transformers to be delivered under this contract. The type test including short-
P a g e | 85
circuit tests shall be conducted according to IEC standard from an independent &
international recognized testing laboratory such as KEMA, CESI. The test shall carry
out in presence of two engineers from PETL Co.
Temperature-rise test: The test shall be in accordance with IEC.60076-2 and shall be
carried out on one transformer of each size and type.
Temperature-rise test shall be conducted on the tapping corresponding to the
maximum losses.
As a special test, an impulse voltage withstands test including chopped waves on each
different rating of transformer.
The test shall carry out in presence of two engineers from PETL Co
43. PACKING AND TRANSPORT
Transformer shall be transported to destination with their tanks full of oil up to the
service level.
Bushings and any accessories or fittings likely to be damaged shall be protected
adequately against damage in transit.
44. DRAWINGS AND DIAGRAMS
With Bid
The following drawing shall be supplied with the bid.
General arrangement drawing of each rating of transformer offered showing:
i) Minimum clearance (phase to phase and phase to earth) on H. V. and L.V.
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bushings including clearance H.V. to L.V.
ii) Positions and identification in a separate legend of all fittings with type
numbers.
iii) Size and position of all fixing holes.
iv) Total weights with and without oil and core lifting height and weight.
Detail dimensioned drawings of tapping switch illustrating type of material,
clearances, between tapping points and to earth and method of operation.
Detailed dimensioned drawing of bushings, silica gel or plain oil seal type
breather, and conservator.
Note: Where sealed transformers are offered, a cross arrangement drawing shall
be submitted with the tender showing, in particular, details of the tank
construction and internal tank finish and the depth of the expansion space above
the oil.
With Contract
Latest issues of the drawing shall be supplied under the contract; if no
modifications are applicable to the drawings supplied with the tender, this shall
be confirmed in writing under the contract and further drawings need not be
supplied.
Rating and diagram plate drawing shall be supplied.
TESTS
45. GENERAL REQUIREMENT
As provided in the Conditions of Contract, the whole of the materials used in the
contract shall be subject to such inspection and test at the manufacturer's works as the
Purchaser may direct from time to time as the work proceeds. The cost of such
P a g e | 87
inspection and tests, including the provision and use of test equipment, shall be
included in the Contract.
Not less than three weeks notice of all tests shall be given to the Purchaser in order
that he may be present if he so desires. As many tests as in the opinion of the Purchaser
are possible shall be arranged together. Three copies of the Supplier's records of all
tests shall be furnished to the Purchaser.
The approval by the Purchaser of the results of such inspection and tests shall not
relieve the Supplier of his obligations under the Contract for the satisfactory
performance of the goods and materials.
If, due to the Contract Works and/or component materials not complying with this
specification, further tests are necessary, the Supplier shall pay all additional costs
which may be incurred in re-testing.
During the execution of the Contract, test specimens, if required by the Purchaser shall
be taken from the materials for the purpose of check tests or analyses by Independent
Authorities. Such specimens shall be prepared for testing and forwarded at the
expense of the Supplier to the Testing Authorities selected by the Purchaser.
The Purchaser reserves the rights to call for further tests which are in his opinion
necessary to confirm satisfactory performance. Tests shall as far as possible simulates
site conditions.
The Supplier shall submit certified type test certificates for all equipment covering the
type tests detailed in this section. Evidence to this effect shall be submitted at the time
of bidding.
P a g e | 88
Type tests will normally only be required when certified test certificates are not
available for identical equipment.
Routine tests will be required on all equipment as described in this Section. High
voltage tests shall be to IEC 60060 unless otherwise indicated.
Except where otherwise indicated all electrical tests shall be carried out at rated
frequency with an approximately sinusoidal waveform.
All instruments shall be approved by the Purchaser and if required shall be calibrated
at the Supplier's expense.
Lightning Arresters
Type and Routine tests shall be in accordance with IEC 99-4.
Drop-out Fuse Switch & Switch Disconnector
Type and routine sample tests to IEC 60129 shall be carried out.
STAY WIRE
The stay wires shall be hot dip zinc-coated and manufactured from steel. They shall be
in accordance with internationally recognized Standard. Such information shall be
submitted with the Bid.
The wire shall have the following dimensions and strength:
Nominal area 52 mm2
P a g e | 89
Calculated approximate diameter 9.2 mm
Rated breaking strength 70 kN
Number of strands 19
46. STAY WIRE ACCESSORIES
The following accessories shall be delivered, as specified in the price schedules.
Stay wire tension adjusting device, of the U-bolt type, complete sets with necessary
nuts and fittings.
Stay wire attachment devices for attachment to wood or steel pole. The attachment
may be preformed grip or clamp type. The device shall be as complete sets suitable
for the specified stay wire and its rated strength.
Suitable and matching stay wire anchors for soil and rock shall be supplied as per
price schedules.
P a g e | 90
IV. Technical Schedules – LOT1
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A1: Switch-Disconnecters 36 kV with load breaking head, 3-phase, complete. For top and side
mounting
Nº Description Unit Required Offered
specifications
1 Rated Voltage 36
2 Maximum Service Voltage kV 38
3 Rated Frequency Hz 50
4 Rated continuous current by 45 oC
ambient temperature A 630
5 Breaking Capacity kA 25
6 Rated shortcircuit current 1 sec. kA 25
7 Impulse withstand voltage
(a) To earth kV 170
(b) Across the isolating distance kV 195
8 Maximum temperature rise over current
carrying parts oC 90
9 Creepage distance across insulator mm 900
10 Maximum bending torque at base of
support insulator kN 4
11
Equipped with Top horizontal to be
installed on lattice pole arm (K2231,
K2233, K2234) as bellow picture
Yes/No Yes
12 3 separate, single pole Yes/No Yes
P a g e | 92
A2: SF6 pole mounted Motorized Switch-Disconnectors 36kV with load breaking head, 3-phase,
complete with all protection, control unit (Manuel and auto- operation with interlocked) and Ability
for SCADA application (top and side mounting). With monitor display appear (Volts, Amps, Type of
fault, etc..)
Nº Description Unit Required Offered
specifications
1 Rated Voltage 36
2 Maximum Service Voltage kV 38
3 Rated Frequency Hz 50
4 Rated continuous current by 45 oC
ambient temperature A 630
5 Breaking Capacity kA 25
6 Rated shortcircuit current 1 sec. kA 25
7 Impulse withstand voltage
(a) To earth kV 170
(b) Across the isolating distance kV 195
8 Maximum temperature rise over current
carrying parts oC 90
9 Creepage distance across insulator mm 900
10 Maximum bending torque at base of
support insulator kN 4
11 Equipped with Top and side mounting
accessories Yes/No Yes
12 3 separate, single pole Yes/No Yes
13 Operation time 1 S Yes/No Yes
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14 Enclosure in ASI 304 stainless steel
Yes/No Yes
15 Manual or motorized operating mechanism
Yes/No Yes
16 IEC 62271-200 compliant
Yes/No Yes
P a g e | 94
A3: 36kV Autorecloser with relevant set of MV C.T&PT tank type transformers (with CT rating of 20-
40/5A). Ability for SCADA application
Nº Description Unit Required Offered
specifications
1 Manufacturer
2 Design
The autorecloser shall be
designed for pole
mounting
3 Modes of operation
Autoreclosers shall be
equipped to provide three
phase trippings and
reclosures
4 Operating Mechanism
The closing mechanism
shall be solenoid operated
whereby the solenoid
during closing charges a
spring which drives the
tripping mechanism
5 Power Supply
The recloser shall
preferably be completely
self contained deriving all
its energy from the
feeding side of the HV
network
6 Batteries
90 V Lithum battery with
minimum battery life span
of 10 years
7 Control Cabinet
separate control cabinet
shall be provided either
mounted on the recloser
tank or connected to the
recloser by means of 10
meter multicore cable
P a g e | 95
8 Control functions
-local/remote control
selection
-closing/tripping
-autoreclose in/out (one
trip to lockout)
-protection
engaged/disengaged
-earth fault in/out
-sensitive earth fault
in/out
-relay status.
9 Protection Requirements
The protection system
shall have facilities for:
-phase faults
-earth faults
-sensitive earth fault
10 Trip setting
The trip setting range for
phase faults shall
minimum cover 20 to 800
A while for earth faults 10
to 400 A
11 Insulating and Interrupting
Medium
The interrupting medium
shall be SF6. The
insulating medium shall be
SF6. The SF6 gas used
shall comply with IEC
publication 376.
12 Ratings
13 Nominal operating voltages kV 33
14 Maximum system voltage kV 36
15 One minute power frequency
withstand voltage kV 70
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16 Basic Insulation Level kV 170
17 continuous current rating A 400
18 The short time 3 seconds
current rating kA 8
19 The interrupting current kA 8
20 closing and latching capabil kA 20
21 Bushing Current
Transformers
The bushing current
transformers for
protection shall be single
core
CT Ratings
- Ratio is set at 20-40/5
A
- 20-40/1 A CT for
Thermal Relay
Protection
- Burden - at least 5 VA
(minimum 20% spare
capacity)
- Class - 10P10
P a g e | 97
A4: 36kV Autorecloser with relevant set of MV C.T&PT tank type transformers (with CT rating of 50-
100/5A). Ability for SCADA application
Nº Description Unit Required Offered
specifications
1 Manufacturer
2 Design
The autorecloser shall
be designed for pole
mounting
3 Modes of operation
Autoreclosers shall be
equipped to provide
three phase trippings
and reclosures
4 Operating Mechanism
The closing mechanism
shall be solenoid
operated whereby the
solenoid during closing
charges a spring which
drives the tripping
mechanism
5 Power Supply
The recloser shall
preferably be
completely self
contained deriving all
its energy from the
feeding side of the HV
network
6 Batteries
90 V Lithum battery
with minimum battery
life span of 10 years
7 Control Cabinet
separate control cabinet
shall be provided either
mounted on the
recloser tank or
P a g e | 98
connected to the
recloser by means of 10
meter multicore cable
8 Control functions
-local/remote control
selection
-closing/tripping
-autoreclose in/out (one
trip to lockout)
-protection
engaged/disengaged
-earth fault in/out
-sensitive earth fault
in/out
-relay status.
9 Protection Requirements
The protection system
shall have facilities for:
-phase faults
-earth faults
-sensitive earth fault
10 Trip setting
The trip setting range
for phase faults shall
minimum cover 20 to
800 A while for earth
faults 10 to 400 A
11 Insulating and
Interrupting Medium
The interrupting
medium shall be SF6.
The insulating medium
shall be SF6. The SF6
gas used shall comply
P a g e | 99
with IEC publication
376.
12 Ratings
13 Nominal operating
voltages kV 33
14 Maximum system voltage kV 36
15
One minute power
frequency withstand
voltage
kV 70
16 Basic Insulation Level kV 170
17 continuous current rating A 400
18 The short time 3 seconds
current rating KA 8
19 The interrupting current KA 8
20 closing and latching
capabil KA 20
21 Bushing Current
Transformers
The bushing current
transformers for
protection shall be
single core
CT Ratings
- Ratio is set at 50-100/5 A
- 10-100/1 A CT for Thermal Relay
Protection - Burden - at least 5
VA (minimum 20%
spare capacity) - Class - 10P10
P a g e | 100
A5: 36kV Autorecloser with relevant set of MV C.T&PT tank type transformers (with CT rating of 100-
200/5A)
Nº Description Unit Required Offered
specifications
1 Manufacturer
2 Design The autorecloser shall be
designed for pole mounting
3 Modes of operation
Autoreclosers shall be
equipped to provide three
phase trippings and
reclosures
4 Operating Mechanism
The closing mechanism
shall be solenoid operated
whereby the solenoid
during closing charges a
spring which drives the
tripping mechanism
5 Power Supply
The recloser shall
preferably be completely
self contained deriving all
its energy from the feeding
side of the HV network
6 batteries
90 V Lithum battery with
minimum battery life span
of 10 years
7 Control Cabinet
separate control cabinet
shall be provided either
mounted on the recloser
tank or connected to the
recloser by means of 10
meter multicore cable
8 control functions -local/remote control
selection
-closing/tripping
P a g e | 101
-autoreclose in/out (one
trip to lockout)
-protection
engaged/disengaged
-earth fault in/out
-sensitive earth fault in/out
-relay status.
9 Protection Requirements
The protection system shall
have facilities for:
-phase faults
-earth faults
-sensitive earth fault
10 trip setting
The trip setting range for
phase faults shall minimum
cover 20 to 800 A while for
earth faults 10 to 400 A
11 Insulating and Interrupting
Medium
The interrupting medium
shall be SF6. The insulating
medium shall be SF6. The
SF6 gas used shall comply
with IEC publication 376.
12 Ratings
13 Nominal operating voltages kV 33
14 Maximum system voltage kV 36
15 One minute power frequency
withstand voltage kV 70
16 Basic Insulation Level kV 170
17 continuous current rating A 400
18 The short time 3 seconds
current rating KA 8
P a g e | 102
19 The interrupting current KA 8
20 closing and latching capabil KA 20
21 Bushing Current
Transformers
The bushing current
transformers for
protection shall be single
core
CT Ratings
- Ratio is set at 100-
200/5 A
- 100-200/1 A CT for
Thermal Relay
Protection
- Burden - at least 5 VA
(minimum 20% spare
capacity)
- Class - 10P10
P a g e | 103
A6: 36kV pole mounted Autorecloser with relevant set of MV C.T&PT tank type transformers (with
CT rating of 200-400/5A). Ability for SCADA application
Nº Description Unit Required Offered
specifications
1 Manufacturer
2 Design
The autorecloser shall be
designed for pole
mounting
3 Modes of operation
Autoreclosers shall be
equipped to provide
three phase trippings
and reclosures
4 Operating Mechanism
The closing mechanism
shall be solenoid
operated whereby the
solenoid during closing
charges a spring which
drives the tripping
mechanism
5 Power Supply
The recloser shall
preferably be completely
self contained deriving
all its energy from the
feeding side of the HV
network
6 batteries
90 V Lithum battery with
minimum battery life
span of 10 years
7 Control Cabinet
separate control cabinet
shall be provided either
mounted on the recloser
tank or connected to the
P a g e | 104
recloser by means of 10
meter multicore cable
8 control functions
-local/remote control
selection
-closing/tripping
-autoreclose in/out (one
trip to lockout)
-protection
engaged/disengaged
-earth fault in/out
-sensitive earth fault
in/out
-relay status.
9 Protection Requirements
The protection system
shall have facilities for:
-phase faults
-earth faults
-sensitive earth fault
10 trip setting
The trip setting range for
phase faults shall
minimum cover 20 to
800 A while for earth
faults 10 to 400 A
11 Insulating and Interrupting
Medium
The interrupting medium
shall be SF6. The
insulating medium shall
be SF6. The SF6 gas
used shall comply with
IEC publication 376.
P a g e | 105
12 Ratings
13 Nominal operating voltages kV 33
14 Maximum system voltage kV 36
15 One minute power
frequency withstand
voltage
kV 70
16 Basic Insulation Level kV 170
17 continuous current rating A 400
18 The short time 3 seconds
current rating KA 8
19 The interrupting current KA 8
20 closing and latching capabil KA 20
21 Bushing Current
Transformers
The bushing current
transformers for
protection shall be
single core
CT Ratings
- Ratio is set at 200-
400/5 A - 200-400/1 A CT for
Thermal Relay Protection
- Burden - at least 5
VA (minimum 20% spare capacity)
- Class - 10P10
P a g e | 106
A7: 24kV pole mounted Autorecloser with relevant set of MV C.T&PT tank type transformers (with
CT rating of 40-50/5A). Ability for SCADA application
Nº Description Unit Required Offered
specifications
1 Manufacturer
2 Design
The autorecloser shall
be designed for pole
mounting
3 Modes of operation
Autoreclosers shall be
equipped to provide
three phase trippings
and reclosures
4 Operating Mechanism
The closing mechanism
shall be solenoid
operated whereby the
solenoid during closing
charges a spring which
drives the tripping
mechanism
5 Power Supply
The recloser shall
preferably be
completely self
contained deriving all
its energy from the
feeding side of the HV
network
6 Batteries
90 V Lithum battery
with minimum battery
life span of 10 years
7 Control Cabinet
separate control cabinet
shall be provided either
mounted on the
recloser tank or
P a g e | 107
connected to the
recloser by means of 10
meter multicore cable
8 Control functions
-local/remote control
selection
-closing/tripping
-autoreclose in/out (one
trip to lockout)
-protection
engaged/disengaged
-earth fault in/out
-sensitive earth fault
in/out
-relay status.
9 Protection Requirements
The protection system
shall have facilities for:
-phase faults
-earth faults
-sensitive earth fault
10 Trip setting
The trip setting range
for phase faults shall
minimum cover 20 to
800 A while for earth
faults 10 to 400 A
11 Insulating and
Interrupting Medium
The interrupting
medium shall be SF6.
The insulating medium
shall be SF6. The SF6
gas used shall comply
P a g e | 108
with IEC publication
376.
12 Ratings
13 Nominal operating
voltages kV 22
14 Maximum system voltage kV 24
15 One minute power
frequency withstand
voltage
kV 50
16 Basic Insulation Level kV 125
17 continuous current rating A 400
18 The short time 3 seconds
current rating KA 8
19 The interrupting current KA 8
20 closing and latching
capabil KA 20
21 Bushing Current
Transformers
The bushing current
transformers for
protection shall be
single core
CT Ratings
- Ratio is set at 40-50/5 A
- 40-50/1 A CT for Thermal Relay
Protection - Burden - at least 5
VA (minimum 20%
spare capacity) - Class - 10P10
P a g e | 109
A8: 24kV pole mounted Autorecloser with relevant set of MV C.T&PT tank type transformers (with
CT rating of 100-200/5A). Ability for SCADA application
Nº Description Unit Required Offered
specifications
1 Manufacturer
2 Design
The autorecloser shall be
designed for pole
mounting
3 Modes of operation
Autoreclosers shall be
equipped to provide
three phase trippings
and reclosures
4 Operating Mechanism
The closing mechanism
shall be solenoid
operated whereby the
solenoid during closing
charges a spring which
drives the tripping
mechanism
5 Power Supply
The recloser shall
preferably be completely
self contained deriving
all its energy from the
feeding side of the HV
network
6 batteries
90 V Lithum battery with
minimum battery life
span of 10 years
7 Control Cabinet
separate control cabinet
shall be provided either
mounted on the recloser
tank or connected to the
P a g e | 110
recloser by means of 10
meter multicore cable
8 control functions
-local/remote control
selection
-closing/tripping
-autoreclose in/out (one
trip to lockout)
-protection
engaged/disengaged
-earth fault in/out
-sensitive earth fault
in/out
-relay status.
9 Protection Requirements
The protection system
shall have facilities for:
-phase faults
-earth faults
-sensitive earth fault
10 trip setting
The trip setting range for
phase faults shall
minimum cover 20 to
800 A while for earth
faults 10 to 400 A
11 Insulating and Interrupting
Medium
The interrupting medium
shall be SF6. The
insulating medium shall
be SF6. The SF6 gas
used shall comply with
IEC publication 376.
P a g e | 111
12 Ratings
13 Nominal operating voltages kV 22
14 Maximum system voltage kV 24
15 One minute power
frequency withstand
voltage
kV 50
16 Basic Insulation Level kV 25
17 continuous current rating A 400
18 The short time 3 seconds
current rating KA 8
19 The interrupting current KA 8
20 closing and latching capabil KA 20
21 Bushing Current
Transformers
The bushing current
transformers for
protection shall be
single core
CT Ratings
- Ratio is set at 100-200/5 A
- 100-200/1 A CT for Thermal Relay Protection
- Burden - at least 5 VA (minimum 20%
spare capacity) - Class - 10P10
P a g e | 112
A9: 24kV pole mounted Autorecloser with relevant set of MV C.T&PT tank type transformers (with
CT rating of 300-600/5A). Ability for SCADA application
Nº Description Unit Required Offered
specifications
1 Manufacturer
2 Design
The autorecloser shall be
designed for pole
mounting
3 Modes of operation
Autoreclosers shall be
equipped to provide
three phase trippings
and reclosures
4 Operating Mechanism
The closing mechanism
shall be solenoid
operated whereby the
solenoid during closing
charges a spring which
drives the tripping
mechanism
5 Power Supply
The recloser shall
preferably be completely
self contained deriving
all its energy from the
feeding side of the HV
network
6 batteries
90 V Lithum battery with
minimum battery life
span of 10 years
7 Control Cabinet
separate control cabinet
shall be provided either
mounted on the recloser
tank or connected to the
P a g e | 113
recloser by means of 10
meter multicore cable
8 control functions
-local/remote control
selection
-closing/tripping
-autoreclose in/out (one
trip to lockout)
-protection
engaged/disengaged
-earth fault in/out
-sensitive earth fault
in/out
-relay status.
9 Protection Requirements
The protection system
shall have facilities for:
-phase faults
-earth faults
-sensitive earth fault
10 trip setting
The trip setting range for
phase faults shall
minimum cover 20 to
800 A while for earth
faults 10 to 400 A
11 Insulating and Interrupting
Medium
The interrupting medium
shall be SF6. The
insulating medium shall
be SF6. The SF6 gas
used shall comply with
IEC publication 376.
P a g e | 114
12 Ratings
13 Nominal operating voltages kV 22
14 Maximum system voltage kV 24
15 One minute power
frequency withstand
voltage
kV 50
16 Basic Insulation Level kV 25
17 continuous current rating A 400
18 The short time 3 seconds
current rating kA 8
19 The interrupting current kA 8
20 closing and latching capabil kA 20
21 Bushing Current
Transformers
The bushing current
transformers for
protection shall be
single core
CT Ratings
- Ratio is set at 300-600/5 A
- 300-600/1 A CT for
Thermal Relay Protection
- Burden - at least 5 VA (minimum 20% spare capacity)
- Class - 10P10
P a g e | 115
A10: Metering Unit pole mounted MV measuring 33kV (KW/h, KVAR, etc..) Class 0.2; With CT and
VT, Ability for SCADA application, with protection fuse
The meter must be microprocessor based numeric type and perform the measurements of
electrical quantities such as kWh; kVARh ; kVA; maximum demand; A ; V …etc ( three phase
and single phase).
The unit must be equipped with GSM-GPRS modem, optical port and communication ports.
Software for setting and operation of the meter is requested.
Nº Description Unit Required Offered
specifications
1 Nominal voltage kV 3*64/110V up to
3*240/415V
2 CT,VT Connection 4-wire connection
3 Frequency Hz 50Hz
4 rating current A 5A
5 Accuracy 0.2
6 Temperature range C -30C° to +75 C°
7 Surge voltage withstand kV 36 kV
8 Communications
Serial port
Electrical ports
Optical port
Modbus
RS232 or RS485
According to (IEC 62056-
21)
P a g e | 116
A11: Metering Unit pole mounted MV measuring 22kV (KW/h KVAR, etc.) Class 0.2; With CT and VT,
Ability for SCADA application, with protection fuse
The meter must be microprocessor based numeric type and perform the measurements of
electrical quantities such as kWh; kVARh ; kVA; maximum demand; A ; V …etc ( three phase
and single phase).
The unit must be equipped with GSM-GPRS modem, optical port and communication ports.
Software for setting and operation of the meter is requested.
Nº Description Unit Required Offered
specifications
1 Nominal voltage kV 3*64/110V up to
3*240/415V
2 CT,VT Connection 4-wire connection
3 Frequency Hz 50Hz
4 rating current A 5A
5 Accuracy 0.2
6 Temperature range C -30C° to +75 C°
7 Surge voltage withstand kV 24 kV
8 Communications
Serial port
Electrical ports
Optical port
Modbus
RS232 or RS485
According to (IEC 62056-
21)
P a g e | 117
A12: 3 Phase 36kV electronic sectionalizer, Nominal current: Actuating current Resettable 6 - 215 A,
Types of inrush currents detected Symmetric and asymmetric, Inrush detection time < 1 cycle
Nº Description Unit Required Offered
specifications
1 Nominal system voltage kV 33
2 Max. Operating voltage kV 36
3 Frequency HZ 50
4 USE - OUT DOOR
5 Insulating
Support
Currents
Max. rated A 300
Short time current
1s(effective
kA 4
Asymmetrical initial
(peak
kA 10
6 Sectionalizing
link current
Max.rated A 800
Short time current
1s(effective
kA 4
Asymmetrical initial
(peak
kA 10
7 Actuating current A
8 Selection way for current actuating ---- Manually
adjustable
9 times Dead line detection Sec.
Min.
<0,100
Counting memory ≥3
P a g e | 118
Memory reset Sec.
Sec.
25-35
Short circuit detection ≤0,04
10
Impulse withstand voltage (1.2*50 ms)
(a)To earth & between phase
kV
170
11 Number of counts before operation Manually
adjustable
between
1,2,3,4
12 Communication interface ( GSM ,SCADA
)future ability
yes
13 External needed materials ( if required
for operation)
No/
yes
yes
P a g e | 119
A13: 33kV Fault Indicator (visual)
Table of contents:
1. General
……………………………………………………………….....................................
91
1.1
Scope…………………………………………………………………………………………
91
1.2 Quality
Insurance……………………………………………………………….....................
91
2. Wireless communication Fault detection
systems………………………………….............
91
2.1 General information
…………………………………………………………………............
91
2.2 Operational
specifications……………………………………………………........................
94
2.3 Additional requirements…………….
………………………………………………............
97
P a g e | 120
1. 1. General
1.1 Scope
This specification applies to a system allowing to remotely monitor appearance of faults on an Overhead
Medium Voltage network so that to localise faulty sections and send patrols for reconfiguration of the
network accordingly.
The system shall be made of:
- Fault detection systems with wireless communication to be installed on Medium Voltage Overhead Electric
networks, as specified in this document,
- A piece of software to be installed on a PC in the control centre so that to display the information from
these Fault passage indicators. This shall be referred to as a Fault Monitoring software. THIS IS NOT
SPECIFIED IN THIS DOCUMENT.
1.2 Quality Insurance
The Bidder shall supply documentary proof that the manufacturer possesses ISO 9001 and ISO 14001
Quality insurance certification, from an independent internationally recognized body, for the design,
manufacture and testing of Fault Indicators and remote monitoring and control equipment for medium
voltage lines
2. 2. Wireless communication Fault detection systems
2.1 General information
2.1.1 System parameters
The Fault detection systems shall be designed to operate on a Medium Voltage overhead network with the
following characteristics:
- Nominal Operation Voltage 4 to 69 kV
- System Maximum Voltage 69 kV
- Frequency 50 Hz (or 60Hz)
- Type of MV neutral earthing through a resistor or solidly grounded
- Conductor diameter 5 to 22 mm
One single product shall be proposed to cover the whole range of above characteristics: Particularly, the
same product should be installed on any network from 4 to 69 kV. Offers requiring to have in stock 2 or
more different product references depending on the Line Voltage or on the conductor diameter shall not be
considered.
P a g e | 121
2.1.2 Service conditions
The Fault detection system shall be designed to operate in the following environmental conditions:
Symmetrical Fault Current 12.5 kA/1s and 25kA/170ms (maximum phase current
that the system shall withstand)
Shocks & vibrations 120 minutes of sine vibrations and 2000 negative and
2000 positive shocks, in OX, OY and OZ axes
Lightning surge 125kV shocks
Maximum Ambient Temperature 55° C
Maximum annual average
temperature
25° C
Humidity At least 95% during at least 2 24 hours cycles with
temperature up to +55°C according to IEC 68 2 30
2.1.3 Purpose of equipment
The main functions of the equipment are:
-To detect phase-to-phase and phase-to-earth fault currents on the MV network.
-To detect voltage presence interruptions.
-To time stamp faults and Voltage dips and store them in memory
-To transmit information to the control centre spontaneously via the GSM/GPRS network.
-To provide a local light indication of fault.
-To measure load current on the line.
-To provide operators with all useful information for fault finding and preventive maintenance.
-To be self-supplied at all times, including during outages.
2.1.4 Constitution
2.1.4.1 Components
The equipment shall be made of the following parts:
-Fault Passage Indicators clipped on the overhead lines. One such device shall be clipped on each phase so
that to measure current and Voltage presence in this phase and compute fault detection algorithm
accordingly. A short-range radio interface shall be embedded in this Fault Passage Indicator so that to allow
it communicate with the GSM/GPRS communication interface mentioned below.
-A GSM/GPRS communication interface, pole-mounted, acting as a communication gateway between Fault
Passage Indicators using short-range radio and the remote control centre using GSM/GPRS communication.
-A solar supply kit, made of a solar panel and a rechargeable battery, mounted on the same pole,
appropriately dimensioned to continuously supply the GSM/GPRS communication interface considering the
average sun radiation in the country.
2.1.4.2 GSM/GPRS communication interface
The GSM/GPRS communication interface shall be designed to be mounted on a wooden, concrete or
metallic pole. It shall be able to interface up to 9 Fault Passage Indicators installed in a 100m maximum
range at least, corresponding to up to 3 overhead lines.
Solutions using a GSM/GPRS interface allowing to to interface only 3 or 6 Fault Passage Indicators, i.e. 1 or
2 MV lines, or within a maximum range less than 100m shall NOT be considered.
The GSM/GPRS communication interface maximum dimensions shall be 300 x 250 x 150 mm (H x L x D).
This box shall include the following functions:
P a g e | 122
- Short range radio Interface to up to 9 Fault Passage Indicators in a 100m range.
- GSM/GPRS communication to control center
- Configuration of the communication interface (GSM/GPRS communication, definition of alarms…) and
Fault Passage Indicators (Fault detection thresholds…) by connection of a laptop running the configuration
software to an RS232 interface on the communication interface. The same software shall also include full
diagnostic capabilities.
It shall be supplied by the solar panel + battery block installed above it on the same same pole. Connection
cables between GSM/GPRS communication interface and solar panel + battery block shall be provided.
2.1.4.3 Fault Passage Indicator
The Fault Passage Indicators shall be designed to be clipped on the Overhead MV line. 3 Fault Passage
Indicators shall be clipped on one line, one on each phase. It shall include the following functions:
- Measurement of current running in the phase it is clipped on
- Detection of Voltage absence/presence on the phase it is clipped on
- From the 2 previous functions, detection of phase-to-phase and phase-to-earth faults
- Short-range radio communication with a GSM/GPRS communication interface at a maximum distance of
100m at least.
It shall be self-supplied from a non-rechargeable battery of a minimum life time 8 years, in the temperature
conditions specified above, including at least 1 short range radio communication with the GSM/GPRS
communication interface every hour and 300 hours flashing for fault indication all over these 8 years.
The Fault Passage Indicators shall be suitable for outdoor use in the tropical climate condition stipulated in
the relevant paragraph. The components used in the Fault Passage Indicators shall be suitably protected from
direct sunlight to prevent malfunctioning due to solar radiation. The maximum operating temperature shall
not be less than 55° C. The Fault Passage Indicators shall be suitable for mounting on live line conductors of
a diameter ranging between 5 and 25 mm, thanks to clamps designed so that the Fault Passage Indicator can
withstand winds of 150km/h without falling from the line. The Fault Passage Indicator shall be fully self-
contained type without any external connection, indicator or sensors. The Fault Passage Indicators shall be
suitable for use on multiple lines supported by the same pole.
2.1.4.4 Solar panel supply kit
This kit shall be composed of a solar panel and rechargeable battery.It shall be provided with a cable of
minimum length 3m for connection to the GSM/GPRS communication interface installed on the same pole.
2.2 Operational specifications
2.2.1 Fault detection
Fault detection shall be performed by the Fault Passage Indicator described above. Fault sensing shall be
made from current measurement and Voltage presence detection, based on detection of the electromagnetic
field and its variations.
The Fault Passage Indicator shall be of the programmable type, suitable for sensing:
- Short-circuit faults up to 12.5 kA for 1s and 25 kA for 170ms.
- Low earth leakage faults (referred to as “unbalance”) down to 6A.
The Fault Passage Indicators shall detect faults based on 2 simultaneous tripping criterias:
P a g e | 123
- In order to detect strong fault currents (typically phase-to-phase faults), it shall trip when the phase current
exceeds an absolute threshold for a fixed duration of about 20 to 30 ms. This absolute threshold must be
configurable to at least 8 different values between 100 and 800A.
- In order to detect low fault currents (typically resistant phase-to-earth faults), it shall trip when it detects
the phase current increase within a fixed duration (about 20 to 30ms) exceeds a relative threshold. This
threshold must be configurable to at least 6 different values between 6 and 80A.
It shall be possible to disable this second tripping criteria.
When a fault occurs on the network, the upstream protection will trip within 70s maximum (inverse time
protection). Therefore, in order to prevent tripping due to a load increase, on detection of one of the above
criterias, the Fault Passage Indicators shall confirm the fault by checking if the voltage disappears within the
next 70s. and start to indicate the fault only under this condition.
In case of faults, the Fault Passage Indicators which are detecting the variation of the electromagnetic field
due to fault current (Fault Passage Indicators installed between the circuit breaker and fault point) shall
provide a fault indication, while Fault Passage Indicators downstream the fault or on non-faulty branches
shall not provide any indication.
The fault indication shall be provided:
- by the means of a flashing light system offering a good contrast against sunshine (red color is prefered) and
an MTBF of the light emitting system at least 45 000 Hours (LEDs for instance). It shall provide a light of
an intensity of 40 Lumen minimum and give a 360° visibility from at least 50m in sunny day conditions, and
at least 300m at night.
- By an alarm sent to the GSM/GPRS interface which shall itself forward the alarm to the control center
according to its configuration.
The Fault indication shall remain until:
- a time-out, configurable to at least 4 possible values between 2 and 16 hours, has expired,
- the medium voltage is back,
- the Fault Passage Indicator is reset manually,
- Whatever condition comes first.
Caution: since the load current might be very low upon MV return, load current reset is not acceptable.
The Fault indication reset shall consist in:
- stopping the local light indication flashing
- sending an alarm to the GSM/GPRS interface which shall itself forward this alarm to the control center
according to its configuration.
The Fault Passage Indicator shall include some self-test possibility usable when it is on the line (powered or
not).
The Fault Passage Indicator shall be selective in action as indicated below
- It shall not respond to any sudden variation (increases/decrease) in load current
- It shall not respond to a overcurrent not due to a fault
- It shall not respond to high magnetising inrush currents, created upon line energising.
2.2.2 Detection of voltage presence and absence
The Fault Passage Indicator shall send a message to the GSM/GPRS interface as soon as it detects
disappearance or appearance of Voltage on the MV conductor. The GSM/GPRS interface shall then
memorise the information as a time-stamped event and send an alarm to the control centre according to its
configuration.
2.2.3 Digital inputs
P a g e | 124
The GSM/GPRS interface shall allow connection of information from sensors available in the immediate
vicinity to potential-free inputs. At least 6 potential-free digital inputs shall be included in the GSM/GPRS
interface.
2.2.4 Measurements
The Fault Passage Indicator shall continuously measure the current running in the conductor on which it is
clipped and periodically send the minimum, maximum and average values measured. The GSM/GPRS
interface shall then store this information to allow reading it locally by connecting a PC or remotely from the
control centre. The sending period shall not be more than 1 hour.
2.2.5 Event time-stamping
Any change of state of information shall generate a time-stamped event stored in the GSM/GPRS interface
memory.
The event storage capacity shall be at least 100 events.
2.2.6 Short-range radio
Short range radio shall use license-free radio in the frequency bandwidth 902-928 MHz. It shall be designed
so that to allow a maximum distance between GSM/GPRS interface and the Fault Passage Indicators equal
to 100m or more.
Indicators of short range radio transmission quality shall be available and displayed by connection of a PC to
the GSM/GPRS interface.
Antennas for short-range radio communication shall be embedded in or fixed on the products (GSM/GPRS
interface and Fault Passage Indicator) so that no specific installation is required.
2.2.7 Communication with the control centre
Communication between the GSM/GPRS interface and the control centre shall be through GSM/GPRS
network, dual-band 900 MHz – 1800 MHz, and using any standard protocol.
It shall allow communication in 2 ways:
- At any time, based on configured periodic calls or on operator action, the GSM/GPRS interface shall be
ready to receive a call from the control centre
- Whenever a monitored information declared as alarming in the GSM/GPRS interface configuration
changes status, the GSM/GPRS interface shall make a call to the control centre and send it an alarm.
Each monitored information (fault current detection, voltage absence/presence, digital inputs etc…)
shall be configurable as "alarming" when changing state, individually and independently of others. If
used with GSM communication, as an addition to the alarm to the control centre, it shall be possible
to configure the GSM/GPRS interface so that it send an SMS message to a mobile phone. The
configuration software shall allow to define the mobile phone number and SMS messages service
centre number.
Monitored information configurable as “alarming” shall include at least the following, consisting both of
MV network diagnostic information and monitoring equipment internal faults for self-diagnostic purpose:
- Fault detection appearance with indication of Fault Passage Indicator reporting the fault and tripping
criteria tripped.
P a g e | 125
- Fault detection disappearance with indication of Fault Passage Indicator reporting the fault and tripping
criteria tripped.
- Voltage absence
- Voltage presence
- Change of state of a digital input
- Fault Passage Indicator absent (failure of the GSM/GPRS communication interface to communicate with it
through short range radio)
- Fault Passage Indicator battery low
2.2.8 Configuration and maintenance
Equipment configuration and diagnostic shall be performed by connection of a laptop PC to the GSM/GPRS
interface using the PC RS232 interface.
Configuration shall include:
2.2.8.1 Scanning of all Fault Passage Indicators in the short range radio range (at least 100m) and assigning
of an identification (typically number) to each of them, so that to allow identification of line (when
GSM/GPRS interface is monitoring 6 or 9 Fault Passage Indicators) and phase on the line on which each
Fault Passage Indicator is clipped-on, in order to allow identification by the control centre of line and phase
where faults or voltage absence are detected.
2.2.8.2 Configuration of fault detection thresholds and other characteristics.
2.2.8.3 Configuration of communication: PIN code, telephone numbers (control centre and mobile for
sending SMS messages), transmission speed, etc…
2.2.8.4 Configuration of alarms, as explained above
Diagnostic shall include at least display of the current value of all information monitored (Fault Passage
indicators list and status, Fault indications (phase-to-phase and phase-to-earth) from Fault Passage
indicators, digital inputs, measurements….) and an embedded protocol analyser showing frames received
and sent.
2.3 Additional requirements
2.3.1 Marking
Each Fault Passage Indicator shall carry a weather and corrosion proof plate indicating the following
particulars.
- Manufacturer’s identification.
- Model or type number (as per catalogue)
- Year of manufacture in characters big enough to allow reading from the ground so that to provide
indication of battery age.
2.3.2 Environmental specifications
2.3.2.1 Mechanical resistance to vibration and shocks
2.3.2.2 The equipment shall have vibration resistance in accordance with
2.3.2.3 IEC 60068.2.6: 10 to 500 Hz; 0.7 mm peak to peak from 10 to 59Hz and 5g from 59 to 500 Hz.
2.3.2.4 IEC 60068.2.27: 40g / 6 ms / 2000 positive and 2000 negative shocks in each direction, in the three
directions.
Dielectric withstand
IEC 61010 Insulation (50 Hz/1 min.): 2 kV
EN 60-950 Impulse wave (1.2/50 µs): 5 kV
Electromagnetic compatibility
P a g e | 126
Electrostatic discharge IEC 1000-4-2 Level 3
Radiated fields IEC 1000-4-3 Level 3
Radio frequency IEC 1000-4-6 Level 3
Magnetic immunity, 50 Hz, IEC 1000-4-8 Level 4
Emissions EN 55011 Class A
2.3.3 Environment
Operating temperature: -25°C to +55°C
Storage temperature: -25°C to +70°C
Humidity: 95% at 40°C
2.3.4 Documentation
Each device shall be supplied with a user manual for installation and commissioning on site.
A14: 22kV Fault Indicator (visual)
Table of contents:
1. General ………………………………………………………………..................................... 99
1.1 Scope………………………………………………………………………………………… 99
1.2 Quality Insurance………………………………………………………………..................... 99
2. Wireless communication Fault detection systems…………………………………............. 99
2.1 General information …………………………………………………………………............ 99
2.2 Operational specifications……………………………………………………........................ 102
2.3 Additional requirements……………. ………………………………………………............ 106
P a g e | 127
1. General
1.1 Scope
This specification applies to a system allowing to remotely monitor appearance of faults on
an Overhead Medium Voltage network so that to localise faulty sections and send patrols for
reconfiguration of the network accordingly.
The system shall be made of:
- Fault detection systems with wireless communication to be installed on Medium Voltage
Overhead Electric networks, as specified in this document,
- A piece of software to be installed on a PC in the control centre so that to display the
information from these Fault passage indicators. This shall be referred to as a Fault
Monitoring software. THIS IS NOT SPECIFIED IN THIS DOCUMENT.
1.2 Quality Insurance
The Bidder shall supply documentary proof that the manufacturer possesses ISO 9001 and
ISO 14001 Quality insurance certification, from an independent internationally recognized
body, for the design, manufacture and testing of Fault Indicators and remote monitoring and
control equipment for medium voltage lines
2. Wireless communication Fault detection systems
2.1 General information
2.1.1 System parameters
The Fault detection systems shall be designed to operate on a Medium Voltage overhead
network with the following characteristics:
- Nominal Operation Voltage 4 to 69 kV
- System Maximum Voltage 69 kV
- Frequency 50 Hz (or 60HZ)
- Type of MV neutral earthing through a resistor or solidly grounded
- Conductor diameter 5 to 22 mm
One single product shall be proposed to cover the whole range of above characteristics:
Particularly, the same product should be installed on any network from 4 to 69 kV. Offers
requiring to have in stock 2 or more different product references depending on the Line
Voltage or on the conductor diameter shall not be considered.
2.1.2 Service conditions
The Fault detection system shall be designed to operate in the following environmental
conditions:
P a g e | 128
Symmetrical Fault Current 12.5 kA/1s and 25KA/170ms (maximum phase current
that the system shall withstand)
Shocks & vibrations 120 minutes of sine vibrations and 2000 negative and
2000 positive shocks, in OX, OY and OZ axes
Lightning surge 125kV shocks
Maximum Ambient Temperature 55° C
Maximum annual average
temperature
25° C
Humidity At least 95% during at least 2 24 hours cycles with
temperature up to +55°C according to IEC 68 2 30
2.1.3 Purpose of equipment
The main functions of the equipment are:
-To detect phase-to-phase and phase-to-earth fault currents on the MV network.
-To detect voltage presence interruptions.
-To time stamp faults and Voltage dips and store them in memory
-To transmit information to the control centre spontaneously via the GSM/GPRS network.
-To provide a local light indication of fault.
-To measure load current on the line.
-To provide operators with all useful information for fault finding and preventive
maintenance.
-To be self-supplied at all times, including during outages.
2.1.4 Constitution
2.1.4.1 Components
The equipment shall be made of the following parts:
-Fault Passage Indicators clipped on the overhead lines. One such device shall be clipped on
each phase so that to measure current and Voltage presence in this phase and compute fault
detection algorithm accordingly. A short-range radio interface shall be embedded in this
Fault Passage Indicator so that to allow it communicate with the GSM/GPRS communication
interface mentioned below.
-A GSM/GPRS communication interface, pole-mounted, acting as a communication gateway
between Fault Passage Indicators using short-range radio and the remote control centre using
GSM/GPRS communication.
-A solar supply kit, made of a solar panel and a rechargeable battery, mounted on the same
pole, appropriately dimensioned to continuously supply the GSM/GPRS communication
interface considering the average sun radiation in the country.
2.1.4.2 GSM/GPRS communication interface
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The GSM/GPRS communication interface shall be designed to be mounted on a wooden,
concrete or metallic pole. It shall be able to interface up to 9 Fault Passage Indicators
installed in a 100m maximum range at least, corresponding to up to 3 overhead lines.
Solutions using a GSM/GPRS interface allowing to to interface only 3 or 6 Fault Passage
Indicators, i.e. 1 or 2 MV lines, or within a maximum range less than 100m shall NOT be
considered.
The GSM/GPRS communication interface maximum dimensions shall be 300 x 250 x 150
mm (H x L x D). This box shall include the following functions:
- Short range radio Interface to up to 9 Fault Passage Indicators in a 100m range.
- GSM/GPRS communication to control center
- Configuration of the communication interface (GSM/GPRS communication, definition of
alarms…) and Fault Passage Indicators (Fault detection thresholds…) by connection of a
laptop running the configuration software to an RS232 interface on the communication
interface. The same software shall also include full diagnostic capabilities.
It shall be supplied by the solar panel + battery block installed above it on the same same
pole. Connection cables between GSM/GPRS communication interface and solar panel +
battery block shall be provided.
2.1.4.3 Fault Passage Indicator
The Fault Passage Indicators shall be designed to be clipped on the Overhead MV line. 3
Fault Passage Indicators shall be clipped on one line, one on each phase. It shall include the
following functions:
- Measurement of current running in the phase it is clipped on
- Detection of Voltage absence/presence on the phase it is clipped on
- From the 2 previous functions, detection of phase-to-phase and phase-to-earth faults
- Short-range radio communication with a GSM/GPRS communication interface at a
maximum distance of 100m at least.
It shall be self-supplied from a non-rechargeable battery of a minimum life time 8 years, in
the temperature conditions specified above, including at least 1 short range radio
communication with the GSM/GPRS communication interface every hour and 300 hours
flashing for fault indication all over these 8 years.
The Fault Passage Indicators shall be suitable for outdoor use in the tropical climate
condition stipulated in the relevant paragraph. The components used in the Fault Passage
Indicators shall be suitably protected from direct sunlight to prevent malfunctioning due to
solar radiation. The maximum operating temperature shall not be less than 55° C. The Fault
Passage Indicators shall be suitable for mounting on live line conductors of a diameter
ranging between 5 and 25 mm, thanks to clamps designed so that the Fault Passage Indicator
can withstand winds of 150km/h without falling from the line. The Fault Passage Indicator
shall be fully self-contained type without any external connection, indicator or sensors. The
P a g e | 130
Fault Passage Indicators shall be suitable for use on multiple lines supported by the same
pole.
2.1.4.4 Solar panel supply kit
This kit shall be composed of a solar panel and rechargeable battery.It shall be provided with
a cable of minimum length 3m for connection to the GSM/GPRS communication interface
installed on the same pole.
2.2 Operational specifications
2.2.1 Fault detection
Fault detection shall be performed by the Fault Passage Indicator described above. Fault
sensing shall be made from current measurement and Voltage presence detection, based on
detection of the electromagnetic field and its variations.
The Fault Passage Indicator shall be of the programmable type, suitable for sensing:
- Short-circuit faults up to 12.5 kA for 1s and 25 kA for 170ms.
- Low earth leakage faults (referred to as “unbalance”) down to 6A.
The Fault Passage Indicators shall detect faults based on 2 simultaneous tripping criterias:
- In order to detect strong fault currents (typically phase-to-phase faults), it shall trip when
the phase current exceeds an absolute threshold for a fixed duration of about 20 to 30 ms.
This absolute threshold must be configurable to at least 8 different values between 100 and
800A.
- In order to detect low fault currents (typically resistant phase-to-earth faults), it shall trip
when it detects the phase current increase within a fixed duration (about 20 to 30ms) exceeds
a relative threshold. This threshold must be configurable to at least 6 different values
between 6 and 80A.
It shall be possible to disable this second tripping criteria.
When a fault occurs on the network, the upstream protection will trip within 70s maximum
(inverse time protection). Therefore, in order to prevent tripping due to a load increase, on
detection of one of the above criterias, the Fault Passage Indicators shall confirm the fault by
checking if the voltage disappears within the next 70s. and start to indicate the fault only
under this condition.
In case of faults, the Fault Passage Indicators which are detecting the variation of the
electromagnetic field due to fault current (Fault Passage Indicators installed between the
circuit breaker and fault point) shall provide a fault indication, while Fault Passage Indicators
downstream the fault or on non-faulty branches shall not provide any indication.
The fault indication shall be provided:
- by the means of a flashing light system offering a good contrast against sunshine (red color
is prefered) and an MTBF of the light emitting system at least 45 000 Hours (LEDs for
P a g e | 131
instance). It shall provide a light of an intensity of 40 Lumen minimum and give a 360°
visibility from at least 50m in sunny day conditions, and at least 300m at night.
- By an alarm sent to the GSM/GPRS interface which shall itself forward the alarm to the
control center according to its configuration.
The Fault indication shall remain until:
- a time-out, configurable to at least 4 possible values between 2 and 16 hours, has expired,
- the medium voltage is back,
- the Fault Passage Indicator is reset manually,
- whatever condition comes first.
Caution: since the load current might be very low upon MV return, load current reset is not
acceptable.
The Fault indication reset shall consist in:
- stopping the local light indication flashing
- sending an alarm to the GSM/GPRS interface which shall itself forward this alarm to the
control center according to its configuration.
The Fault Passage Indicator shall include some self-test possibility usable when it is on the
line (powered or not).
The Fault Passage Indicator shall be selective in action as indicated below
- It shall not respond to any sudden variation (increases/decrease) in load current
- It shall not respond to a overcurrent not due to a fault
- It shall not respond to high magnetising inrush currents, created upon line energising.
2.2.2 Detection of voltage presence and absence
The Fault Passage Indicator shall send a message to the GSM/GPRS interface as soon as it
detects disappearance or appearance of Voltage on the MV conductor. The GSM/GPRS
interface shall then memorise the information as a time-stamped event and send an alarm to
the control centre according to its configuration.
2.2.3 Digital inputs
The GSM/GPRS interface shall allow connection of information from sensors available in
the immediate vicinity to potential-free inputs. At least 6 potential-free digital inputs shall be
included in the GSM/GPRS interface.
2.2.4 Measurements
The Fault Passage Indicator shall continuously measure the current running in the conductor
on which it is clipped and periodically send the minimum, maximum and average values
measured. The GSM/GPRS interface shall then store this information to allow reading it
locally by connecting a PC or remotely from the control centre. The sending period shall not
be more than 1 hour.
2.2.5 Event time-stamping
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Any change of state of information shall generate a time-stamped event stored in the
GSM/GPRS interface memory.
The event storage capacity shall be at least 100 events.
2.2.6 Short-range radio
Short range radio shall use license-free radio in the frequency bandwidth 902-928 MHz. It
shall be designed so that to allow a maximum distance between GSM/GPRS interface and the
Fault Passage Indicators equal to 100m or more.
Indicators of short range radio transmission quality shall be available and displayed by
connection of a PC to the GSM/GPRS interface.
Antennas for short-range radio communication shall be embedded in or fixed on the products
(GSM/GPRS interface and Fault Passage Indicator) so that no specific installation is
required.
2.2.7 Communication with the control centre
Communication between the GSM/GPRS interface and the control centre shall be through
GSM/GPRS network, dual-band 900 MHz – 1800 MHz, and using any standard protocol.
It shall allow communication in 2 ways:
- At any time, based on configured periodic calls or on operator action, the GSM/GPRS
interface shall be ready to receive a call from the control centre
- Whenever a monitored information declared as alarming in the GSM/GPRS interface
configuration changes status, the GSM/GPRS interface shall make a call to the control centre
and send it an alarm.
Each monitored information (fault current detection, voltage absence/presence, digital inputs
etc…) shall be configurable as "alarming" when changing state, individually and
independently of others. If used with GSM communication, as an addition to the alarm to the
control centre, it shall be possible to configure the GSM/GPRS interface so that it send an
SMS message to a mobile phone. The configuration software shall allow to define the mobile
phone number and SMS messages service centre number.
Monitored information configurable as “alarming” shall include at least the following,
consisting both of MV network diagnostic information and monitoring equipment internal
faults for self-diagnostic purpose:
- Fault detection appearance with indication of Fault Passage Indicator reporting the fault and
tripping criteria tripped.
- Fault detection disappearance with indication of Fault Passage Indicator reporting the fault
and tripping criteria tripped.
- Voltage absence
- Voltage presence
- Change of state of a digital input
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- Fault Passage Indicator absent (failure of the GSM/GPRS communication interface to
communicate with it through short range radio)
- Fault Passage Indicator battery low
2.2.8 Configuration and maintenance
Equipment configuration and diagnostic shall be performed by connection of a laptop PC to
the GSM/GPRS interface using the PC RS232 interface.
Configuration shall include:
2.2.8.1 Scanning of all Fault Passage Indicators in the short range radio range (at least 100m)
and assigning of an identification (typically number) to each of them, so that to allow
identification of line (when GSM/GPRS interface is monitoring 6 or 9 Fault Passage
Indicators) and phase on the line on which each Fault Passage Indicator is clipped-on, in
order to allow identification by the control centre of line and phase where faults or voltage
absence are detected.
2.2.8.2 Configuration of fault detection thresholds and other characteristics.
2.2.8.3 Configuration of communication: PIN code, telephone numbers (control centre and
mobile for sending SMS messages), transmission speed, etc…
2.2.8.4 Configuration of alarms, as explained above
Diagnostic shall include at least display of the current value of all information monitored
(Fault Passage indicators list and status, Fault indications (phase-to-phase and phase-to-earth)
from Fault Passage indicators, digital inputs, measurements….) and an embedded protocol
analyser showing frames received and sent.
2.3 Additional requirements
2.3.1 Marking
Each Fault Passage Indicator shall carry a weather and corrosion proof plate indicating the
following particulars.
- Manufacturer’s identification.
- Model or type number (as per catalogue)
- Year of manufacture in characters big enough to allow reading from the ground so that to
provide indication of battery age.
2.3.2 Environmental specifications
2.3.2.1 Mechanical resistance to vibration and shocks
2.3.2.2 The equipment shall have vibration resistance in accordance with
2.3.2.3 IEC 60068.2.6: 10 to 500 Hz; 0.7 mm peak to peak from 10 to 59Hz and 5g from 59
to 500 Hz.
2.3.2.4 IEC 60068.2.27: 40g / 6 ms / 2000 positive and 2000 negative shocks in each
direction, in the three directions.
P a g e | 134
Dielectric withstand
IEC 61010 Insulation (50 Hz/1 min.): 2 kV
EN 60-950 Impulse wave (1.2/50 µs): 5 kV
Electromagnetic compatibility
Electrostatic discharge IEC 1000-4-2 Level 3
Radiated fields IEC 1000-4-3 Level 3
Radio frequency IEC 1000-4-6 Level 3
Magnetic immunity, 50 Hz, IEC 1000-4-8 Level 4
Emissions EN 55011 Class A
2.3.3 Environment
Operating temperature: -25°C to +55°C
Storage temperature: -25°C to +70°C
Humidity: 95% at 40°C
2.3.4 Documentation
Each device shall be supplied with a user manual for installation and commissioning on site.
P a g e | 135
V. Technical Schedules – LOT2
P a g e | 136
PREAMBLE
1.1 The Technical Schedules shall be filled in and completed by the Bidder, and submitted with the
Bid.
1.2 All documentation necessary to evaluate whether the equipment offered is in accordance with
this Specification shall be submitted with the Bid.
1.3 All data entered in the Schedules of Technical Guarantees are guaranteed values by the Bidder
and cannot be departed from whatsoever.
1.4 All data entered in the Schedules of Informative. Data are also guaranteed values by the Bidder.
These data may only be altered following the Engineer's written consent.
P a g e | 137
B1: 36kV, under-ground cable, single core 1x400mm2 AL (XLPE/PVC)
Nº Description Unit Required Offered specifications
1 Cable Design NA2XS(FL)2Y
2 Insulation Material XLPE
3 Design Voltage Uo/U (Um) kV 19/33 (36)
4 Cross section mm2 400
5 Conductor material AL
6 No. of Cores 1
7
The conductor is covered with:
1. swelling powder to prevent axial ingress of water along the conductor
2. An extruded semi-conducting layer
3. A layer of dry vulcanized cross-linked polyethylene (XLPE) insulation
4. An extruded vulcanized semi-conducting layer
5. A layer of swelling tape to prevent axial ingress of water along the screen
6. A layer of earthing screen of stranded copper, connection between copper and aluminum
7. A layer of longitudinal aluminum to prevent water break-through
8. A black outer LDPE (low density polyethylene) sheath that is laminated to the longitudinal
Yes/No Yes
P a g e | 138
aluminum, for water tightness and mechanical protection.
8 Minimum No. of wires in
conductor No. 30
9 Nominal insulation thickness mm 8
10 Nominal sheath thickness mm 3.4
11 Approximate outer diameter mm 50.2
12 Minimum bending radius mm 1100
13 Approximate cable weight kg/km 3200
14 Max. conductor DC resistance
at 20°C Ω/km 0.0778
15 Short Circuit rating conductor
(1 sec) kA 36.8
16 Standard supply lengths m 1000
17 Maximum temperature rise of
conductor oC 90
P a g e | 139
B2: 36kV, under-ground cable, single core 1x150mm2 AL (XLPE/PVC)
Nº Description Unit Required Offered specifications
1 Cable Design NA2XS(FL)2Y
2 Insulation Material XLPE
3 Design Voltage Uo/U (Um) kV 19/33 (36)
4 Cross section mm2 150
5 Conductor material AL
6 No. of Cores 1
7
The conductor is covered
with:
1. swelling powder to prevent axial ingress of water along the conductor
2. An extruded semi-conducting layer
3. A layer of dry vulcanized cross-linked polyethylene (XLPE) insulation
4. An extruded vulcanized semi-conducting layer
5. A layer of swelling tape to prevent axial ingress of water along the screen
6. A layer of earthing screen of stranded copper, connection
Yes/No Yes
P a g e | 140
between copper and aluminum
7. A layer of longitudinal aluminum to prevent water break-through
8. A black outer LDPE (low density polyethylene) sheath that is laminated to the longitudinal aluminum, for water tightness and mechanical protection.
8 Minimum No. of wires in
conductor No.
9 Nominal insulation
thickness mm 8
10 Nominal sheath thickness mm 2.4
11 Approximate outer
diameter mm 39.9
12 Minimum bending radius mm 900
13 Approximate cable weight kg/km 2000
14 Max. conductor DC
resistance at 20°C Ω/km 0.206
15 Short Circuit rating
conductor (1 sec) kA 13.9
16 Standard supply lengths m 1000
17 Maximum temperature
rise of conductor oC 90
P a g e | 141
B3: Outdoor termination for 36 kV, under-ground cable, 1 core 1x150mm2 Al (XLPE/PVC) (Set of 3
phases), Including Compression terminal lug for 150mm2 Al
Nº Description Unit Required Offered
specifications
1 Name of Manufacturer
2 Country of Origin
3 Standards IEC60502 & CENELEC
HD629.1 S1
4 Max. Service Voltage (Um) kV 36
5 Outdoor Termination Material ,
form , Designation
Heat Shrink Tubing and
Molded Parts Shall be
Flexible, Made from
Specially Formulated
Cross-Lined Polymeric
6 Cable and Conductor Type Single Core Conductor
Cable with Al Wire Shield
7 Cable Insulation Type XLPE
8 Conductor Cross Sectional Area mm2 150
9 Number of Rain Sheds No 4
P a g e | 142
10
Insulating , Electrical Material
and Rain Shed Brittle
Temperature
oC <-40
11
Impulse withstand Voltage Test
1.2 Micro Second Between
Conductor & Screen Grounded
kV 170
12- Test :
12.1
All Type tests reports by
qualified laboratory according
to CENELEC HD 629.1 S1
Required
12.2 Routine test report Required
13
Heat Shrinkable Outdoor Termination Kit Parts
Bimetallic Terminal
Mechanical Lug with 13 mm
Hole and 3 each Shear_Head
Bolts (for Aluminium or
Copper Conductors)
Required
Anti-Tracking Sleeve Required
Rain-Sheds (4each) Required
Stress Control Sleeve Required
Stress Control Mastic Required
P a g e | 143
Binding Wire Required
Worm Drive Clamp Required
Copper Braid (Earthlings) Required
17 Installation Instruction
Documents Required
P a g e | 144
B4: Outdoor termination for 36 kV, under-ground cable, 1 core 1x400mm2 Al (XLPE/PVC) (Set of 3
phases), Including Compression terminal lug for 400mm2 Al
Nº Description Unit Required Offered
specifications
1 Name of Manufacturer
2 Country of Origin
3 Standards IEC60502 & CENELEC
HD629.1 S1
4 Max. Service Voltage (Um) kV 36
5 Outdoor Termination Material ,
form , Designation
Heat Shrink Tubing and
Molded Parts Shall be
Flexible, Made from
Specially Formulated
Cross-Lined Polymeric
6 Cable and Conductor Type Single Core Conductor
Cable with Al Wire Shield
7 Cable Insulation Type XLPE
8 Conductor Cross Sectional Area mm2 400
P a g e | 145
9 Number of Rain Sheds No 4
10
Insulating , Electrical Material
and Rain Shed Brittle
Temperature
oC <-40
11
Impulse withstand Voltage Test
1.2 Micro Second Between
Conductor & Screen Grounded
kV 170
12- Test :
12.1
All Type tests reports by
qualified laboratory according
to CENELEC HD 629.1 S1
Required
12.2 Routine test report Required
13
Heat Shrinkable Outdoor Termination Kit Parts
Bimetallic Terminal
Mechanical Lug with 13 mm
Hole and 3 each Shear_Head
Bolts (for Aluminium or
Copper Conductors)
Required
Anti-Tracking Sleeve Required
Rain-Sheds (4each) Required
Stress Control Sleeve Required
P a g e | 146
Stress Control Mastic Required
Binding Wire Required
Worm Drive Clamp Required
Copper Braid (Earthlings) Required
17 Installation Instruction
Documents Required
P a g e | 147
B5: Straight joint for 36 kV, under-ground cable, single core 1x150 mm2 Al (XLPE/PVC)(Set of 3
phases), Including filler for 150mm2 Al
Nº Description Unit Required Offered specifications
1 Submittal of
Drawings/catalogues
Yes/No YES
2 Type Outdoor Straight
joint for under-
ground cable, single
core 1x150 mm2 Al
(XLPE)
3 Dimensions single core 1x150
mm2 Al (XLPE)
4 Length mm 1860
P a g e | 148
B6: Straight joint for 36 kV, under-ground cable, single core 1x400 mm2 Al (XLPE/PVC)(Set of 3
phases), Including filler for 400mm2 Al
Nº Description Unit Required Offered specifications
1 Submittal of
Drawings/catalogues
Yes/No YES
2 Type Outdoor Straight
joint for under-
ground cable, single
core 1x400 mm2 Al
(XLPE)
3 Dimensions single core 1x400
mm2 Al (XLPE)
4 Length mm 1860
P a g e | 149
VI. Technical Schedules – LOT3
P a g e | 150
C1: ACSR Conductor 185mm2/25mm2(DIN 48.204)
Nº Description Unit Required Offered specifications
1 Name of Manufacturer
2 Country of Origin
3 Reference Manufacturing Standards
German Conductor
Sizes DIN48204 or
EN 50182
5 Type
Aluminum
Conductor Steel
Reinforced - (ACSR)
6 Core Material
Greased Stranded
Galvanized Steel
Wires
7 Conductor Material Stranded
Aluminum Wires
8 Code ACSR 185/25
9 Nominal Cross-Sectional area of
ACSR Wire mm2 204
10 Number of Steel Core Strands No. 7
11 Diameter of Steel Core Strand mm 2.1
12 Number of Aluminum Strands No. 26
13 Diameter of Aluminum Strand mm 2.7
14 Total Overall Diameter of Conductor mm 17.1
P a g e | 151
15 Max. Conductor DC Resistance at 20
°C Ω/km 0.1939
16 Breaking Strength Newton 55250
17 Min. Current Rating in free Air Amps 470
18 Conductor resistance for base
temperature 20 Co ohm/Km
shall be filled by
manufacturer
19 Modulus of Elasticity kg/mm2 shall be filled by
manufacturer
20 Coefficient of Thermal Elongation ,
per oC
shall be filled by
manufacturer
21 Weight of Aluminum Conductors kg/km 414
22 Weight of Steel Conductors kg/km 191
23 Total Weight of the Conductor kg/km shall be filled by
manufacturer
24 Drum Material New Wood
25 Cable Protection on Drum Wooden Batten
26 Drum Dimensions shall be filled by
manufacturer
27 Conductor Length on Drum m 1000
28
Type Test Certificates/Reports from
internationally reputed testing
agency
Required
29
Acceptance & Routine tests
witnessed by two PEA
representatives
Required
P a g e | 152
C2: ACSR conductor 150mm2/15mm2(DIN 48.204)
Nº Description Unit Required Offered specifications
1 Name of Manufacturer
2 Country of Origin
3 Reference Manufacturing Standards
German Conductor
Sizes DIN48204 or
EN 50182
5 Type
Aluminum
Conductor Steel
Reinforced - (ACSR)
6 Core Material
Greased Stranded
Galvanized Steel
Wires
7 Conductor Material Stranded
Aluminum Wires
8 Code ACSR 150/25
9 Nominal Cross-Sectional area of
ACSR Wire mm2 173.1
10 Number of Steel Core Strands No. 7
11 Diameter of Steel Core Strand mm 2.1
12 Number of Aluminum Strands No. 26
13 Diameter of Aluminum Strand mm 2.7
14 Total Overall Diameter of Conductor mm 17.1
P a g e | 153
15 Max. Conductor DC Resistance at 20
°C Ω/km 0.1939
16 Breaking Strength Newton 55250
17 Min. Current Rating in free Air Amps 470
18 Conductor resistance for base
temperature 20 Co ohm/km
shall be filled by
manufacturer
19 Modulus of Elasticity kg/mm2 shall be filled by
manufacturer
20 Coefficient of Thermal Elongation ,
per oC
shall be filled by
manufacturer
21 Weight of Aluminum Conductors kg/km 414
22 Weight of Steel Conductors kg/km 191
23 Total Weight of the Conductor kg/km shall be filled by
manufacturer
24 Drum Material New Wood
25 Cable Protection on Drum Wooden Batten
26 Drum Dimensions shall be filled by
manufacturer
27 Conductor Length on Drum m 2000
28
Type Test Certificates/Reports from
internationally reputed testing
agency
Required
29
Acceptance & Routine tests
witnessed by two PEA
representatives
Required
P a g e | 154
C3: ACSR conductor 50mm2/8mm2(DIN 48.204)
Nº Description Unit Required Offered specifications
1 Name of Manufacturer
2 Country of Origin
3 Reference Manufacturing Standards British Sizes BS215
PART2 or EN 50182
4 Type
Aluminum
Conductor Steel
Reinforced - (ACSR)
5 Core Material
Greased Stranded
Galvanized Steel
Wires
6 Conductor Material Stranded
Aluminum Wires
7 Code ACSR Rabbit
8 Nominal Cross-Sectional area of
ACSR Wire mm2 61.7
9 Number of Steel Core Strands No. 1
10 Diameter of Steel Core Strand mm 3.35
11 Number of Aluminum Strands No. 6
12 Diameter of Aluminum Strand mm 3.35
13 Total Overall Diameter of Conductor mm 10.05
P a g e | 155
14 Max. Conductor DC Resistance at 20
°C Ω/km 0.5426
15 Breaking Strength Newton 18350
16 Min. Current Rating in free Air Amps 185
17 Conductor resistance for base
temperature 20 Co ohm/km
shall be filled by
manufacturer
18 Modulus of Elasticity kg/mm2 shall be filled by
manufacturer
19 Coefficient of Thermal Elongation ,
per oC
shall be filled by
manufacturer
20 Weight of Aluminum Conductors kg/km 145
21 Weight of Steel Conductors kg/km 69
22 Total Weight of the Conductor kg/km shall be filled by
manufacturer
23 Drum Material New Wood
24 Cable Protection on Drum Wooden Batten
25 Drum Dimensions shall be filled by
manufacturer
26 Conductor Length on Drum m 2000
27
Type Test Certificates/Reports from
internationally reputed testing
agency
Required
28
Acceptance & Routine tests
witnessed by two PEA
representatives
Required
P a g e | 156
C4: ADSS Optical Cable CentraCore included all accosseries, junction boxes and fetings
NOTE: A separate schedule is to be provided for each item offered except for
details common to all items which only needs to be provided once.
PARTICULARS UNITS ITEM No.
Manufacturer's Name and Address
Place of Manufacture
Cable Details:
Nominal Overall Diameter mm
Calculated Breaking Load kN
Maximum permissible cable tension kN
Effective Cross Sectional Area mm2
Effective Modulus of Elasticity GPa
Coefficient of Linear Expansion per oC
Nominal Mass kg/km
Maximum permissible cable strain % strain
Guaranteed strain free window % strain
Minimum permissible cable bending radius
No tension mm
Maximum permissible tension mm
Minimum permissible radius of stringing
sheaves mm
Packaging Details:
Type of Drum
AS 2857-1986 Drum Designation
AS 3983-1991 Drum Designation
Spindle Hole Diameter mm
Method of Lagging
Length of Conductor per Drum m
Gross Mass of Drum, Conductor and kg
Protective External Lagging
P a g e | 157
Mass of Drum and Conductor kg
Drum Surface Treatment:
Barrel:
Drum Surface Treatment:
Internal Surface of Flanges
Metal Drum:
Protection Against Weather or Environment
SINGLE MODE:
Mode field diameter at 1310 nm µm
and Tolerance %
Attenuation
(at zero fiber tension)
At 1310 nm dB/km
At 1550 nm dB/km
Maximum permissible fiber strain % strain
Fiber Proof test strain % strain
Attenuation
(at Maximum permissible fiber strain)
At 1310 nm dB/km
At 1550 nm dB/km
Optical cladding diameter µm
and Tolerance %
Dispersion
1270 to 1340 nm ps/km.nm
1550 nm ps/km.nm
Dispersion Slope at Zero Dispersion ps/(nm2-
Wavelength km)
Maximum continuous operating temperature ºC
Minimum bending radius for coated optical
fiber
Under no tension mm
Under maximum tension mm
P a g e | 158
C5: Stranded Copper Conductor 35mm2 (Solid)
Nº Description Unit Required Offered
specifications
1 Conductor section mm2 35
2 Conductor diameter mm
3 Stranding
(a) Aluminium Nº/mm
(b) Aluweld Nº/mm
(c) Cu Nº/mm
(d) Fe Nº/mm
DC resistance at 20 °C Ohm/km
Modulus of elasticity kN/mm2
4 Ultimate specific tensile strength kN/mm2
Thermal coefficient of expansion ºC-1
Wight of Aluminum or Copper kg/km
kg/m
Weight kg
Weight of heaviest reel, including cable
Size of biggest reel, diameter/width mm/mm
P a g e | 159
C7: Polymeric tension insulator 36 kV-1170 creepage distance ACSR, complete with Fittings for
Dead end tension set, suitable for fixing (120- 185) mm2 ACSR to steel poles. There shall be an
adjustable part in the set, for adjustment when stringing
Nº Description Unit Required Offered
specifications
1 Voltage kV 36
2 Insulation Material Polymeric
3 Total length mm 585 mín
4 Max. working load kN 70
5 Breaking load kN 70
6 Creepage distance
(a) Total
mm 1170 mín
(b) Protected
mm 1170 mín
7 Power Freq/Impulse withstand voltage kV/kV 170
(a) Dry
kV 170
(b) wet
kV 170
P a g e | 160
C8: 36 kV Pin insulator 170 mm pin with 2 nuts, 100 mm threads
Nº Description Unit Required Offered
specifications
1 Voltage kV 36
2 Insulation Material Polymeric
3 Cantilever Strength kN 10
4 Total length mm 430 min
5 Max. working load kN 10
6 Breaking load kN 10
7 Creepage Distance
(a) Total mm 1170
8 (b) Protected mm 1170
9 Power Freq/Impulse withstand voltage kV/kV 170
10 (a) Dry kV 170
11 (b) wet kV 170
12 Spindle-Thread diameter mm 140 min
P a g e | 161
C9: Lightning Arresters 36kV
Nº Description Unit Required Offered
specifications
1 Maximum Voltage kV 36
2 Rated Voltage Uc kV 33
3 Maximum con.s operating voltage kV rms 21
4 Rated frequency Hz 50
5 Rated discharge current kA 10
6 Line discharge class 2
7 Impulse withstand current, 4/10 ms kA 100
8 Pressure relief capability to IEC 99
8.1 (a) 0.2 sec. fault duration kA rms 20
P a g e | 162
C10: Lightning Arresters 24kV
Nº Description Unit Required Offered
specifications
1 Maximum Voltage kV 24
2 Rated voltage Uc kV rms 22
3 Maximum con.s operating voltage kV rms 15
4 Rated frequency Hz 50
5 Rated discharge current kA 10
6 Line discharge class 2
7 Impulse withstand current, 4/10 ms kA 100
8 Pressure relief capability to IEC 99
8.1 (a) 0.2 sec. fault duration kA rms 20
P a g e | 163
C11: Parallel groove clamp for ACSR 120- 185 mm2
Nº Description Unit Required Offered
specifications
1 Name of Manufacturer
2 Country of Origin
3 Reference Manufacturing
Standards DIN 48072-1
4
Material
a) Body
High strength, corrosion-
resistant, Aluminium alloy
(AlMgSi1)
b) Bolts DIN 933, steel 8.8, hot-dip
galvanized
c) Nuts
DIN 934, steel
hot−dip galvanized,
pressed into lower
clamp body
d) Conical Washers DIN 6796, corrosion-protected
5 Conductor Cross Sectional
Area mm2
120-185 AL and 120/15-185/
ACSR
6 Conductor Diameter mm 14-16
7 Bolts (No. x Size x Length) 3 x M8 x 70
8 Bolt Torque Moments 46Nm
P a g e | 164
C12: Parallel groove clamp for ACSR 50- 125 mm2
Nº Description Unit Required Offered
specifications
1 Name of Manufacturer
2 Country of Origin
3 Reference Manufacturing
Standards DIN 48072-1
4
Material
a) Body
High strength, corrosion-
resistant, Aluminum alloy
(AlMgSi1)
b) Bolts DIN 933, steel 8.8, hot-dip
galvanized
c) Nuts
DIN 934, steel
hot−dip galvanized,
pressed into lower
clamp body
d) Conical Washers DIN 6796, corrosion-protected
5 Conductor Cross Sectional
Area mm2
50-125 AL and 50/8-125/15
ACSR
6 Conductor Diameter mm 3.35-14
7 Bolts (No. x Size x Length) 2 x M8 x 50
8 Bolt Torque Moments 23Nm
P a g e | 165
C30: PVC Insulated Standard Compacted Circular Copper Conductor 1*70 mm2 Yellow/Green
Nº Description Unit Required Offered
specifications
1 Type designation
2 Insulation Material XLPE
3 Design Voltage kV 0.6/1
4 Cross section mm2 70
5 Conductor Material Cu
6 Number of Cores 1
7 Weight of conductor material (Cu) kg/m
8 Continuous current carrying capacity at
ambient temperature of 45°C A 270 (min.)
9 Maximum temperature rise of conductor °C 90
10 Short-circuit capacity, 1 sec kA
11 Test voltage kV 3.5
12 Minimum numbers of turns pr. 40 x bundle
diameter
13 Cable designation
14 Overall diameter of cable mm
15 Weight of heaviest reel, including cable kg
16 Size of biggest reel, diameter/width mm/mm
17 Weight of row material (Cu) kg/m
P a g e | 166
P a g e | 167
VII. Technical Schedules – LOT4
P a g e | 168
E1: 400 kVA, 33-22/0.4 kV Dual ratio outdoor Pole Mounted Distribution Transformer 3 phase,
with off load Tapchanger
Nº Description Unit Required Offered
specifications
1 Continuous Maximum Rating (C.M.R) kVA 400
2 Vector Group Dyn11 Dyn11
3 Normal voltage between phases at no
load
3.1 a) H.V. Volts 33/22kV
3.2 b) L.V. Volts 400
4 Transformer withstand up to 10%
over-voltage without injurious
overheating
Yes/No Yes
5 Tappings No. 7
5.1 a) Plus No. 3x2.5%
5.2 b) Minus No. 3x2.5%
6 Losses
6.1 a) No load loss at normal primary
voltage (no tolerances on high
side)
watts Max 780
6.2 c) Load loss at C.M.R. (no
tolerances on high side)
watts Max 4500
7 Impedance volts at C.M.R. and
normal ratio
% Max. 6%
8 Max temperature rise at C.M.R.:
P a g e | 169
8.1 i) Top oil by thermometer oC 55
8.2 ii) Average winding by
resistance
oC 60
8.3 iii) “Hot Spot” corresponding to
(ii)
oC 115
9 Lightning Impulse Insulation level of:
9.1 a) H.V. winding kVpk 170
9.2 b) L.V. winding kVpk 20
10 Max. core flux density at normal
voltage and frequency at normal
ratio
T 1.7
11 Type of winding (i.e. Cu or Al, foil or
layer)
11.1 (a) HV winding Cu
11.2 (b) LV winding Cu
12 Rated Insulation Level
12.1 (a) 1.2/50 s wave kV
(peak)
170/125
12.2 (b) Power frequency
withstand voltage
kV 70/50
13 Indoor/outdoor outdoor
14 Total external creepage distance 900 - 1050 min
15 Protected creepage distance 900 - 1050 min
16 Rated Insulation Level
16.1 (a) 1.2/50 s wave 33kv 22kv
P a g e | 170
KV
(peak)
170 125
16.2 (b) Power frequency
withstand voltage wet
kV 33kv 22kv
70 50
17 Transformer type (sealed or
breathing)
breathing
18 Type of tap changer Off load
19 Conservator tank
19.1 Tank Drain valves screwed or flanged
19.2 Conservator isolating valves flanged
20 Transformer withstand up to 10%
over-voltage With voltage without
injurious overheating
Yes/No Yes
21 L.V. neutral earthed inside the tank Yes/No No
22 Transformer with Earth studs at both
the H.V. and the L.V. ends of
transformer
Yes/No Yes
23 Bushings arcing horn flash over
distances
mm 130-140
24 insulating oil shall not contain
matters that are not biodegradable
such as PCB
Yes/No Yes
25 Transformer filled with low viscosity
mineral insulation oil
Yes/No Yes
26 Insulation oil complies with the
provision of IEC 60296
Yes/No Yes
P a g e | 171
27 IEC standard for transformer
connection
Yes/No IEC 60076
28 Oil weight Kg
29 Total weight kg
30 Overall dimensions
a) Length
b)Width
c) Height
mm
mm
mm
31 Method of painting
32 Type of paint
33 Thickness of paint
P a g e | 172
E2: 160 kVA, 33- 22/0.4 kV Dual ratio outdoor Pole Mounted Distribution Transformer 3 phase,
with off load Tapchanger
Nº Description Unit Required Offered
specifications
1 Continuous Maximum Rating (C.M.R) kVA 160
2 Vector Group Dyn11 Dyn11
3 Normal voltage between phases at no load
3.1 a) H.V. Volts 33/22kV
3.2 b) L.V. Volts 400
4 Transformer withstand up to 10% over-
voltage without injurious overheating
Yes/No Yes
5 Tappings No. 7
5.1 a) Plus No. 3x2.5%
5.2 b) Minus No. 3x2.5%
6 Losses
6.1 a) No load loss at normal primary
voltage (no tolerances on high side)
watts Max 780
6.2 c) Load loss at C.M.R. (no tolerances on
high side)
watts Max 3500
7 Impedance volts at C.M.R. and normal
ratio
% Max. 6%
8 Max temperature rise at C.M.R.:
8.1 i) Top oil by thermometer oC 55
8.2 ii) Average winding by resistance oC 60
P a g e | 173
8.3 iii) “Hot Spot” corresponding to (ii) oC 115
9 Lightning Impulse Insulation level of:
9.1 a) H.V. winding kVpk 33kV 22kV
170 125
9.2 b) L.V. winding kVpk 20
10 Max. core flux density at normal voltage
and frequency at normal ratio
T 1.7
11 Type of winding (i.e. Cu or Al, foil or layer)
11.1 (a) HV winding Cu
11.2 (b) LV winding Cu
12 Rated Insulation Level
12.1 (a) 1.2/50 s wave kV
(peak)
33kV 22kV
170 125
12.2 (b) Power frequency withstand
voltage
kV 33kV 22kV
70 50
13 Indoor/outdoor outdoor
14 Total external creepage distance 900 - 1050 min
15 Protected creepage distance 900 - 1050 min
16 Rated Insulation Level
16.1 (a) 1.2/50 s wave kV
(peak)
33kV 22kV
170 125
16.2 kV 33kV 22kV
P a g e | 174
(b) Power frequency withstand
voltage wet
70 50
17 Transformer type (sealed or breathing) breathing
18 Type of tap changer Off load
19 Conservator tank Yes/No Yes
19.1 Tank Drain valves screwed or
flanged
19.2 conservator isolating valves flanged
20 Transformer withstand up to 10% over-
voltage With voltage without injurious
overheating
Yes/No Yes
21 L.V. neutral earthed inside the tank Yes/No No
22 Transformer with Earth studs at both the
H.V. and the L.V. ends of transformer
Yes/No Yes
23 Bushings arcing horn flash over distances mm 130-140
24 insulating oil shall not contain matters
that are not biodegradable such as PCB
Yes/No Yes
25 Transformer filled with low viscosity
mineral insulation oil
Yes/No Yes
26 Insulation oil complies with the provision
of IEC 60296
Yes/No Yes
27 IEC standard for transformer connection Yes/No IEC 60076
28 Oil weight kg
29 Total weight kg
30 Overall dimensions mm
P a g e | 175
a) Length
b)Width
c) Height
mm
mm
31 Method of painting
32 Type of paint
33 Thickness of paint
P a g e | 176
E3: 33 kV Capacitor Bank 300 KVA
Nº Description Unit Required Offered
specifications
1 Altitude of site above sea level m - 276 to 900
2 Ambient Temps:
3 Maximum C° 50
4 Minimum C° -5
5 Wind Speed m/s 15
6 Isokeraunic Level 15
7 Pollution Type Dust
8 Relative Humidity
9 Maximum % 100
10 Minimum % <10
11 Rainfall Average Annual mm 600
12 Hail Yes
13 Fog Yes
14 Erection Outdoor/
Indoor
Outdoor pole-
mounted
15 Nominal system voltage phase to phase kV 33
16 Highest system voltage phase kV 36
17 System frequency Hz 50
18 System earth Solid
19 Impulse withstand voltage (1.2/50 u sec wave) kV peak 170
P a g e | 177
20 Power frequency withstand voltage 1 minute kV 85
21 Assumed highest switching surge 3.5
22 Rated power kVAR 300
23 Rated voltage kV 33
24 Rated Frequency Hz 50
25 Insulation level kV 70/170
Each capacitor bank consists of:
A 3 single-phase internally protected capacitor:
Rated voltage kV 33
Rated Frequency Hz 50
Temperature class °C -5/+45
Connection Delta
Nº of units in series/phase Nº 1
Nº of units in parallel/phase Nº 1
Discharge time per unit <75V in 600
sec.
B 3 silicon polymer Zinc-oxide surge arrester for
installation in a solidly grounded system:
Phase-phase kV 33
Rated voltage kV rms 36
Discharge current kA 10
The 33kv capacitor banks are installed in hot-dip galvanized steel racks. The racks are each
supported by four 33kv insulator.
P a g e | 178
E4: 22 kV Capacitor Bank 300 kVAR
Nº Description Unit Required Offered
specifications
1 Altitude of site above sea level m - 276 to 900
2 Ambient Temps:
3 Maximum °C 50
4 Minimum °C -5
5 Wind Speed m/s 15
6 Isokeraunic Level 15
7 Pollution Type Dust
8 Relative Humidity
9 Maximum % 100
10 Minimum % <10
11 Rainfall Average Annual mm 600
12 Hail Yes
13 Fog Yes
14 Erection Outdoor/
Indoor
Outdoor pole-
mounted
15 Nominal system voltage phase to phase kV 22
16 Highest system voltage phase kV 24
17 System frequency Hz 50
18 System earth Solid
19 Impulse withstand voltage (1.2/50 u sec wave) kV peak 125
P a g e | 179
20 Power frequency withstand voltage 1 minute kV 50
21 Assumed highest switching surge 3.5
22 Rated power kVAR 300
23 Rated voltage kV 22
24 Rated Frequency Hz 50
25 Insulation level kV 125
Each capacitor bank consists of:
A 3 single-phase internally protected capacitor:
Rated voltage kV 22
Rated Frequency Hz 50
Temperature class °C -5/+45
Connection Delta
Nº of units in series/phase Nº 1
Nº of units in parallel/phase Nº 1
Discharge time per unit <75V in 600 sec.
B 3 silicon polymer Zinc-oxide surge arrester for
installation in a solidly grounded system:
Phase-phase kV 22
Rated voltage kV rms 24
Discharge current kA 10
The 22 kV capacitor banks are installed in hot-dip galvanized steel racks. The racks are each supported by
four 22 kV insulator.
P a g e | 180
VIII. Technical Schedules – LOT5
P a g e | 181
Technical Guarantees for Items J1-J34: Steel Materials
Nº Description Unit Required Offered specifications
1 Manufacturer
2 Supplier Drawings according
to PETL drawings
Yes/NO Yes
3 Thickness of zinc coating,
steel members
μm 84min
4 Thickness of zinc coating, nuts
and bolts
μm 40min
5 Type of steel for members,
lattice structures
RST-37/2
6 Strength class of steel N/mm2 360 UP TO 510
7 Yield point N/mm2 235(THICKNESS<16mm
8 Type/class of bolts and nuts GRADE 8.8 to BS 4190
9 Self-supporting construction Yes/NO Yes
10 Hot Dip Galvanized Yes/NO Yes
*The supplier shell bring method and statement design