View
229
Download
0
Category
Preview:
Citation preview
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 1/119
BIDDING DOCUMENTS
FOR.
REPLACING THE METERS & THE METERING SYSTEM AT INTERFACE \ BOUNDARY
WITH THE GENERATORS AND DISTRIBUTORS ALONG WITH ESTABLISHMENT
OF A CENTRAL DATA CENTRE (CDC) AT NEHU SUBSTATION.
SPECIFICATION NO: MePTCL/TT-110/2013-14/
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 2/119
BIDDING DOCUMENTS
(TECHNICAL SPECIFICATIONS)
FOR.
REPLACING THE METERS & THE METERING SYSTEM AT INTERFACE \ BOUNDARY
WITH THE GENERATORS AND DISTRIBUTORS ALONG WITH ESTABLISHMENT
OF A CENTRAL DATA CENTRE (CDC) AT NEHU SUBSTATION.
VOLUME – II
SPECIFICATION NO: MePTCL/TT-110/2013-14/
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 3/119
TECHNICALSPECIFICATION
VOLUME –
II
SECTION – I 11KV CT
SECTION – II 11KV VT
SECTION – III 33KV CT
SECTION – IV 33KV VT
SECTION – V 132KV CT
SECTION – VI 132KV VT
SECTION – VII METER
SECTION – VIII SOFTWARE
SECTION –
IX MODEM
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 4/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
1/17 Technical specification, Volume-II
Section –I (11KV CT)
TECHNICAL SPECIFICATION OF 11KV CURRENT TRANSFORMERS
1. SCOPE:
This specification covers the design, manufacture and assembly, testing at
manufacturer’s works site, supply& delivery at site of 11 KV outdoor and indoor current transformer required for metering and current protection including differential
protection of transformer
2. CLIMATIC CONDITION AT SITE:
The climatic conditions at site under which the current transformer shall operate are
as follows:
Maximum ambient temperature : 40° C
Minimum ambient temperature : - 5° C
Relative humidity : 62% to 89%
Average annual rainfall. : 2280 mm
No of months of tropical monsoon : 6 months (May to October)
Seismic Zone : V
Maximum altitude : Above 1000m above sea level.
3. STANDARDS:
The items shall conform in all respects to the following relevant standards/regulations
with latest amendments thereof:
Sl. No. Relevant Standards Title
1.0 IS 2705 (Part I to IV) Current transformers
2.0 IS 4201 Application guide for current transformers.
3.0 IS 2099 High voltage porcelain bushings4.0 IS 11322 Partial discharge measurement in instrument
transformer
5.0 IS 2071 Methods of high voltage testing
6.0 IS 335 Insulating oil
7.0 IS 13947 (Part I),
IS 12063
Degree of protection provided by enclosures for
low voltage switchgear and control
8.0 IEC 60044 - 1 Current transformers
9.0 IS 5561 Electric power connections – terminal
connectors
10.0 IS 4759 Hot dip zinc coatings on structural steel and
other allied products
11.0 IS 2633 Methods of testing weight, thickness and
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 5/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
2/17 Technical specification, Volume-II
Section –I (11KV CT)
uniformity of coating on hot dipped galvanised
articles
12.0 IS 13134/IEC 60815 Guide for selection of insulators in respect of
polluted conditions
Items matching with requirements of other national or international standards whichensure equal or better performance than the standards mentioned above may also be
considered. When the items offered by the supplier conforms to standards other than
those specified above, salient points of difference between the standards adopted and
standards specified in this specification shall be clearly brought out and a copy of
such standards shall invariably be furnished along with the offer.
4. TYPE AND RATING:
1. The current transformers shall be indoor/outdoor type, single phase, dry
(epoxy resin cast) /oil immersed, self cooled and suitable for operation under the
climatic conditions obtaining at site.
2. The current transformers shall have the following ratings:-
i) Nominal system voltage. 11 KV
ii) Highest system voltage. 12 KV
iii) No. of phases in the system. Three
iv) Earthing of system. Effectively earthed
v) Frequency 50 Hz ± 5%
vi) Rated short time thermal current 13.10 kA for 1 sec
vii) Insulation level
a) 1.2/50 micro second lightning impulse
withstand voltage 75KVp
b) 1 minute power frequency withstand
voltage 28KVrms
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 6/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
3/17 Technical specification, Volume-II
Section –I (11KV CT)
3. The current transformers of different ratings shall have the following
characteristics.
Sl.
No.
Rated
transformation
ratio/core
Accuracy
class at all
ratios
Rated
Burden
at allratios
Accuracy limit
factor/instrument
security factor atall ratios
Knee point
voltage at
all ratios Purpose.
1.0 600/1/1/1A Indoor Dry Type (Epoxy Resin )
Core-I 0.2s/ as per
IS std
meeting
CEA
regulation
15 VA ISF ≤ 3.5 - Metering
Core-II 5P10 15 VA ALF : 10 -O/C & E/F
protection.
Core-III PS - -
KPV >=200
RCT at
75oC min
3/4.5Ω,
Imag at
Vk/2=30mA
Differential
protection
2.0 600/1/1/1A Outdoor Type
Core-I 0.2s/ as per
IS std
meeting
CEA
regulation
15 VA ISF ≤ 3.5 - Metering
Core-II 5P10 15 VA ALF : 10 -O/C & E/F
protection.
Core-III PS - -Differential
protection
4. The characteristics of the core classified as PS of the above CT are based on
certain protections assumed and expected to hold good. In case need arises to co-
ordinate any of these characteristics, especially the knee point voltage of the core in
the light of control and relay equipment to be finalized, the tenderer shall keep this
point in view while submitting his offer.
5. TEMPERATURE RISE:
Current transformers shall be capable of carrying their rated primary and secondary
current continuously without any temperature rise exceeding the limits as laid down in
the approved standard to which they are designed and corrected to the difference in
ambient temperature at site and that given in the standard. They shall withstand the
thermal, electrical and mechanical stresses caused by specified symmetrical RMS
breaking current for one second corresponding to a rupturing capacity of 25.0kA for
33 KV circuit breakers.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 7/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
4/17 Technical specification, Volume-II
Section –I (11KV CT)
6. DESIGN FEATURES:
01. GENERAL:
Indoor Type: The current transformers shall be single phase Dry (Epoxy
Resin Cast) type, suitable for the services indicated and conforming to the bestmodern practice of design and manufacture. The transformer unit should be
compatible with ABB indoor type Circuit Breaker presently installed at
NEIGRIHMS sub- station of type (AL1/XLV) .The design of current
transformers shall be such that its accuracy shall not be affected by the
presence of pollution on the external surface of its insulators.
The locations for installation of current transformers are situated in seismic
zone - V. The design and construction shall be such as to provide necessary
protection against the earthquake forces. Dampers and/or additional
supporting structures may be provided with the voltage transformers, if
necessary, to cater for their operation in the seismic zone.
Outdoor Type: The current transformers shall be single phase, oil
immersed and self cooled type, suitable for the services indicated and
conforming to the best modern practice of design and manufacture. The design
of current transformers shall be such that its accuracy shall not be affected by
the presence of pollution on the external surface of its insulators.
The locations for installation of current transformers are situated in seismic
zone - V. The design and construction shall be such as to provide necessary
protection against the earthquake forces. Dampers and/or additionalsupporting structures may be provided with the voltage transformers, if
necessary, to cater for their operation in the seismic zone.
02. CORES:
The cores for the current transformers shall be of high grade non-ageing
electrical silicon laminated steel of low hysteresis loss and high permeability
to ensure high accuracy at both normal and over current.
The cores to be used for metering and indicating instruments shall have a
saturation factor low enough not to cause any damage to meters andinstruments in the event of maximum short circuit currents.
The cores to be used for distance protection and differential protection shall
have a high saturation factor. Magnetisation characteristics curves of these
cores shall be furnished along with the bid.
03. WINDINGS:
Primary winding consisting of suitable number and size of conductors shall be
insulated with special paper having high mechanical strength, high electrical
withstand properties and good ageing qualities. The primary winding shall be
of suitably insulated electrolytic copper wire.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 8/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
5/17 Technical specification, Volume-II
Section –I (11KV CT)
The rating of the secondary windings shall be one/five Ampere. The secondary
terminal shall be brought out in a compartment for easy access. The secondary
terminals shall be provided with shorting arrangements. The secondary taps
shall be adequately reinforced to withstand the normal handling without
damage. Suitably insulated copper wire of electrolytic grade shall be used for secondary windings.
04. TANK:
Each current transformer shall be of Live Tank type to be supplied filled with
insulating oil and shall be hermetically sealed to prevent atmosphere from
coming into contact with oil, avoid filtration and change of oil. In case, the
tenderer intends to use nitrogen or any other inert gas above the oil level as to
permit expansion and contraction of oil, the same shall be stated in the tender.
Both expansion chamber and tank of the current transformer shall be made of high quality steel and shall be able to withstand full vacuum and pressure
occurring during transit, and thermal and mechanical stresses resulting from
maximum short circuit current during operation.
All interiors or exteriors of tanks, secondary box and other metal parts shall be
thoroughly cleaned to remove all rust, scales, corrosion, grease or other
adhering foreign matters. All steel surfaces in contact with insulating oil as far
as accessible shall be painted with not less than two coats of heat resistant oil
insulating varnish. Steel surface exposed to atmosphere if not hot dip
galvanised shall be given a priming coat of zinc chromate and two coats of
light grey rust preventing paint. Other ferrous parts shall be hot-dip galvanised
as per relevant standard.
The metal tank shall have bare minimum number of welded joints so as to
minimize possible locations of oil leakage.
Metal tank of the current transformer shall be provided with two separate
earthing terminals for bolted connection to 50 x 6 mm m.s. flat to be provided
by the purchaser for connection to the station earth mat. The earthing
terminals shall be provided complete with adequate size washers, nuts and
bolts.
The current transformer shall be provided with suitable lifting arrangement for
lifting of the entire unit. The lifting arrangement (lifting eye) shall be
positioned such that the porcelain bushings and tank shall not be damaged
during lifting for transportation/installation.
05. TERMINAL CONNECTORS:
Appropriate number of terminal connectors suitable for ACSR
Panther/Wolf/Raccoon conductor shall be supplied. Suitable terminalconnectors for earth connections shall also be supplied.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 9/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
6/17 Technical specification, Volume-II
Section –I (11KV CT)
06. BUSHINGS:
The bushing and terminal insulator, where provided for the current
transformer shall conform to the latest edition of IS: 2099. The bushings shall
be made of homogeneous, vitreous porcelain of high mechanical and dielectricstrength. Glazing of porcelain shall be of uniform brown or dark brown colour
with smooth surface, arranged to shed away rain water or condensed water
particles.
The bushings shall have ample insulation, mechanical strength and rigidity for
the conditions under which they will be used and shall be designed to prevent
accumulation of explosive gases and to provide adequate oil circulation to
remove internal heat. There shall be no undue stressing of any part of the
bushings due to temperature changes and adequate means shall be provided to
accommodate conductor expansion.
The bushings shall be so designed that when operating at the specified highest
system voltage there will be no electric discharge between the conductors and
bushings. No corrosion or injury would be cause to conductor, insulation or
supports by the formation of substances produced by chemical action. The
insulation of bushing shall be coordinated with that of the current transformer
such that flash-over will occur only externally to the current transformers. The
bushing should not cause radio disturbances when operated at rated voltage.
07. TERMINAL BOX AND JUNCTION BOX:
All secondary terminals shall be brought out in a weatherproof terminal box
on one side of each current transformer. The exterior of this terminal box shall
be hot dip galvanised. A terminal board for short circuiting of secondary
terminals shall be provided.
Cable box alongwith necessary glands for receiving control cables suitable for
mounting on the bottom plate of the terminal box shall be included in the
scope of supply.
A door with locking arrangements shall be provided in the front of the
terminal box so as to permit easy access to the secondary terminals. The door shall have suitable arrangement to check ingress of moisture into the terminal
box.
All terminals shall be clearly marked with identification number to facilitate
connection to external wiring.
Polarity shall be indelibly marked on each primary and secondary terminal.
In addition to terminal box on each current transformer, tenderer shall also
supply a common junction box for each set of three current transformers of
each circuit. The junction box shall be weather proof type suitable for mounting on the steel structure.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 10/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
7/17 Technical specification, Volume-II
Section –I (11KV CT)
The terminal boxes and junction boxes shall be suitable for outdoor
installation and shall conform to IP55 protection class.
08. OIL LEVEL GAUGE:
An oil level gauge shall be provided in indicate the oil level in the current
transformer. The oil gauge shall be mounted in such a way that the oil level
can be seen from the ground level.
09. PRESSURE RELIEVING DEVICES:
Each current transformer shall be provided with a pressure relieving device so
as to prevent bursting of current transformer even under unfavourable
conditions.
10. OIL DRAIN COCK:
An oil drain cock alongwith a stop cock shall be provided in the bottom
flange so as to permit taking of oil samples for testing.
11. OIL FILLING COCK:
An oil filling cock along with a stop cock shall be provided for filling the oil
in the current transformer.
7. MOUNTING STRUCTURES:
The current transformers shall be mounted on steel structures, at a height of 2.5m
from ground level. The tenderer shall ensure that the CTs supplied can be mounted on
the existing steel (galvanized) structures. Necessary connecting materials, such as
clamps, bolts, nuts, washers, etc. as well as foundation bolts for the supporting
structures shall be supplied by the tenderer.
8. RATING PLATE:
Each current transformer shall be provided with a non-corrosive rating plate inaccordance with latest edition of IS: 2705 Part-I. Following additional particulars
shall also be marked on the rating plate of each current transformer.
a) Purpose (measurement or protection), rated output at 0.9 PF lagging, rated
accuracy factor and rated class of accuracy of each secondary winding in
terms of IS: 2705.
b) Terminal numbering of each secondary winding.
c) Knee point voltage.
d) Maximum exciting current at knee point voltage.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 11/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
8/17 Technical specification, Volume-II
Section –I (11KV CT)
e) Secondary winding resistance at 75°C.
f) Rated instrument security factor in respect of winding meant for measurement
and metering.
9. INSULATING OIL:
The quantity of oil for first filling of each CT and the complete specifications of oil
proposed to be used shall be stated. It would be desirable to use oil conforming to the
provisions of latest IS: 335.
10. TESTS:
ROUTINE TESTS:
Each current transformer shall be subjected to routine tests as specified in the latestedition of IS: 2705 (Part I to IV). If the purchaser wishes to have a representative,
tests shall be performed in his presence so as to be witnessed by him.
The routine tests shall consist of the following:
(a) Verification of terminal markings and polarity
(b) Power frequency dry withstand tests on primary winding
(c) Power frequency dry withstand test on secondary windings
(d) Over voltage inter-turn test
(e) Determination of errors or other characteristics according to the
requirements of the appropriate designation or accuracy class as per
individual parts of IS: 2705.
(f) Knee-point voltage and exciting current for PS Class cores
(g) Secondary winding resistance for PS Class cores
(h) Turns ratio for PS Class cores
TYPE TESTS:
The bidder shall furnish four sets of all the type test reports from CPRI or other
accredited laboratories along with the offer. The type tests must have been conducted
less than five years from the date of opening of bid. The Purchaser reserves the right
to repeat the type tests in the presence of a representative at the cost of the Supplier.
The type tests shall be in accordance with the latest edition of IS: 2705 (Part I to IV),and shall consist of the following:
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 12/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
9/17 Technical specification, Volume-II
Section –I (11KV CT)
(a) Short-time current tests
(b) High voltage power frequency wet withstand test
(c) Determination of errors or other characteristics according to therequirements of the appropriate designation or accuracy class as per
individual parts of IS: 2705.
(d) Temperature rise test
(e) Lightning impulse voltage test
(f) Degree of protection tests of secondary terminal, junction box
All the test reports shall be submitted and got approved by the purchaser, before
despatch of the equipment.
SPECIAL TESTS:
The special tests shall consist of the following:
a. Chopped lightning impulse test as a type test
b. Mechanical test
11. DRAWINGS AND INSTRUCTION MANUALS:
The tenderer shall submit, with the tender, all the drawings enumerated in this
specification to enable to purchaser to assess the suitability of equipments.
As soon as possible after the award of the contract, the manufacturer shall supply six
copies of the following drawings which shall describe the equipment in full details for
approval and shall subsequently provide eight complete sets of final approved
drawings, one of which shall be autopositive/soft copy suitable for reproduction.
i.
Outline dimensional drawings.
ii. Assembly Drawings.
iii. Cross sectional view of the current transformer.
iv. Drawings giving details of supporting structures and foundation.
v. Drawing showing the details of terminal connectors.
vi. Magnetising curves.
vii. Wiring diagram with polarity mark.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 13/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
10/17 Technical specification, Volume-II
Section –I (11KV CT)
In addition to the above drawings, the tenderer may supply any other drawing, which
in his opinion is required to describe the equipment in full details.
After the completion of the erection work, the contractor shall furnish seven sets
(including one reproducible on soft copy) of the completion drawings. Six copies of instruction manuals covering instruction for installation and maintenance check tests
shall be supplied by the contractor as a part of this contract.
12. SPARE PARTS:
A list of spare parts recommended for five years operation for the current
transformers shall be furnished with the tender. The purchaser shall decide the actual
quantity of spare parts to be ordered on the basis of the list and the item-wised prices
of spare parts called for in Schedule-V.
13. COMPLETENESS OF EQUIPMENT:
The tenderer shall be complete in all respect and include all accessories which may
not be specifically mentioned in this specification but which are essential for the
completeness of equipment ordered.
14. DEVIATIONS FROM SPECIFICATIONS:
All deviations from the specification shall be separately listed as per proforma given
in Schedule-III, in the absence of which it shall be presumed that the provisions of the
specification are complied with by the tenderer.
15. ERECTION AND SUPERVISION:
The purchaser may at his discretion ask the tenderer to do either the complete erection
or supervision of erection at site of the equipment covered by this specification. The
tenderer shall, therefore, quote their charges separately for (i) erection and (ii) rates
for supervision of erection.
However, if it is decided to do the erection of the above equipment departmentally,
the tenderer shall furnish full and detailed instructions complete with drawings andleaflets to enable the satisfactory erection and commissioning of the equipment by the
purchaser. Such instructions shall reach the purchaser well in advance so that there is
no delay in commencement of erection. The successful tenderer shall supply all
special tools necessary for erection. Details of such tools and the price thereof shall be
stated in the tender separately.
16. GUARANTEED TECHNICAL PARTICULARS:
Guaranteed technical particulars as called for in Schedule-I shall be furnished
alongwith the tender. Any tender lacking the complete information in this respect is
likely to be rejected. Particulars which are not subject to guarantee shall be clearlymarked.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 14/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
11/17 Technical specification, Volume-II
Section –I (11KV CT)
17. SCHEDULE OF INSTALLATION:
Tenderer shall furnish a list of similar equipment supplied by him and presently in
service as per proforma given in Schedule-IV.
18. PACKING & FORWARDING:
The equipment shall be packed in suitable crates so as to withstand handling during
transport and outdoor storage. The supplier must be responsible for any damage to the
equipment during transit due, to improper and inadequate packing. Any material
found short/damaged shall be replaced by the supplier at no extra cost to the
purchaser.
19. SCHEDULE OF REQUIREMENTS:
1. 33 KV single phase, outdoor type current transformers as specified in the
specification above and rating details as per Clause 4.3 and as mentioned below:
Sl. No. Rated transformation
ratio/coreQuantity
1.0 600-300/1/1/1/A (Indoor
Type)
6 Nos
2.0 600-300/1/1/1/A(Outdoor Type) 3 Nos
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 15/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
12/17 Technical specification, Volume-II
Section –I (11KV CT)
SCHEDULE-I
GUARANTEED TECHNICAL PARTICULARS
(The Tenderer shall furnish separate GTPs for different CT ratings)
1. Manufacturer’s name and country of origin:
2. Manufacturer’s type, designation and model:
3. Current transformers data: Core-I Core-II Core-III Core-IV
a. Rated primary current (A):
b. Rated secondary current (A):
c. Transformation ratio:
d. Rated output at 0.9
lagging PF (VA):
e. Class of accuracy:
f. Accuracy limit factor:
g. Knee point voltage (V):
h. Excitation current at
knee point voltage (mA):
i. Secondary limiting voltage:
j. Resistance of secondary winding
at 75°C (Ω):
4. Nominal rated voltage (KV):
5. Maximum voltage of operation (KV):
6. One second over-current factor
(times rated current):
7. Short time thermal rating for:
a) One second. kA (rms):
b) Three seconds kA (rms):
8. Rated dynamic current (Peak value):
9. Instrument security factor for the windingmeant for measurement and metering:
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 16/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
13/17 Technical specification, Volume-II
Section –I (11KV CT)
10. Rated continuous thermal current
and corresponding temperature rise (kA°C):
11. Creepage distance (mm):
12. One minute power frequency dry
withstand test voltage - KV(rms):
13. One minute power frequency wet
withstand test voltage - KV(rms):
14. 1.2/50 micro second full wave
impulse withstand test voltage - KV(Peak):
15 Weight of oil per CT (Kg):
16 Class of oil:
17 Whether pressure relief device
provided (Yes/No):
18 Total weight per C.T. (Kg):
19 Magnetisation curves of C.T.cores
supplied with tender and total
drawing Nos. attached:
20 Overall dimensions (mm x mm x mm):
21 Mounting details:
22 Shipping dimensions of largest package
(mm x mm x mm):
23 Shipping weight of heaviest package (Kg):
24
Enclosed copies of test reports etc:
(Signature of Tenderer)
Name (in block letters)
Stamp
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 17/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
14/17 Technical specification, Volume-II
Section –I (11KV CT)
SCHEDULE-II
SCHEDULE OF PRICES
(to be filled in by Tenderer)
Note : In addition to filling up this Schedule, the Tenderer shall attach separately a detailedlist of materials he is supplying.
S l . N o .
Description U n i t
Q u a n t i t y
E x - W o r k
R a t e ( P )
E x c i s e D u t y
( P )
T a x
( P )
F r e i g h t
&
I n s u r a n c e
( P )
U n i t R a t e
F O R
D e s t i n a t i o n
( P )
T o t a l
A m o u n t ( P )
( i ) (ii) ( i i i ) ( i v )
(v) (vi) (vii) (viii)
(ix)=(v)+
(vi)+(vii)+
(viii) ( x
) = ( i v )
x ( i x )
1 11KV single phase,
indoor dry type/outdoor,
oil filled current
transformer complete
with terminal boxes,
junction boxes and
terminal connectors as
detailed in ‘Schedule of
Requirements’
A 600-300/1/1/1/A (Indoor Type)
Nos 6
B 600-300/1/1/1/A
(Outdoor Type) Nos 3
(Signature of Tenderer)
Name (in block letters)
Stamp
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 18/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
15/17 Technical specification, Volume-II
Section –I (11KV CT)
SCHEDULE-III
SCHEDULE OF DEVIATION FROM SPECIFICATION
Sl. No. Specification Clause No. Details of deviation Justification for
deviation.
(Signature of Tenderer)
Name (in block letters)
Stamp
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 19/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
16/17 Technical specification, Volume-II
Section –I (11KV CT)
SCHEDULE-IV
SCHEDULE OF INSTALLATION
Tenderer shall furnish here a list of similar equipment supplied by him and presently inservice.
Brief description Customer Year of supply
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 20/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
17/17 Technical specification, Volume-II
Section –I (11KV CT)
SCHEDULE-V
SCHEDULE OF SPARE PARTS AND TOOLS
Sl.
No.
Description of Spare Parts Quantity Rate Amount
(Signature of Tenderer)
Name (in block letters)
Stamp
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 21/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
1/14 Technical specification, Volume-II
Section –II (11KV VT)
SPECIFICATION OF 11KV VOLTAGE TRANSFORMER (FOR METERING AND
PROTECTION)
1. SCOPE:
This specification covers the design, manufacture, assembly, testing at manufacturer’sworks, supply, delivery at site of 11KV outdoor voltage transformers and 11KV
indoor voltage transformer (Dry type) .
2. CLIMATIC CONDITION :
The climatic conditions at site under which the voltage transformer shall operate are
as follows:
Maximum ambient temperature : 40° C
Minimum ambient temperature : - 5° C
Relative humidity : 62% to 89%
Average annual rainfall. : 2280 mm
No of months of tropical monsoon : 5 months (May to October)
Seismic Zone : V
Maximum altitude : Above 1000m above sea level.
3. STANDARDS:
The items shall conform in all respects to the following relevant standards/regulations
with latest amendments thereof:
Sl. No. Relevant Standards Title
1.0 IS 3156 (Part I to III) Voltage transformers
2.0 IS 4146 Application guide for voltage transformers.
3.0 IS 2099 High voltage porcelain bushings
4.0 IS 11322 Partial discharge measurement in instrumenttransformer
5.0 IS 2071 Methods of high voltage testing
6.0 IS 335 Insulating oil
7.0 IS 13947 (Part I),
IS 12063
Degree of protection provided by enclosures for
low voltage switchgear and control
8.0 IEC 60044 – 2 Voltage transformers
9.0 IS 5561 Electric power connections – terminal
connectors
10.0 IS 4759 Hot dip zinc coatings on structural steel and
other allied products
11.0 IS 2633 Methods of testing weight, thickness and
uniformity of coating on hot dipped galvanised
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 22/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
2/14 Technical specification, Volume-II
Section –II (11KV VT)
articles
12.0 IS 13134 Guide for selection of insulators in respect of
polluted conditions
Items matching with requirements of other national or international standards which
ensure equal or better performance than the standards mentioned above may also beconsidered. When the items offered by the supplier conforms to standards other than
those specified above, salient points of difference between the standards adopted and
standards specified in this specification shall be clearly brought out and a copy of
such standards shall invariably be furnished along with the offer.
4. TYPE AND RATING:
a. The voltage transformer shall be single phase, oil immersed; self cooled core
type suitable for outdoor operation, effectively earthed under the climatic condition as
given in this specification.
b. The voltage transformers shall have the following ratings:
i) Normal system voltage : 11 KV
ii) Highest system voltage : 12 KV
iii) Frequency : 50 Hz ± 5%
iv) System of earthing : Effectively earthed
v) Ratio : 11/√3 KV: 110V/√3V-110V/√3
vi) No. of secondary windings : Two
vii) Rated burden:
(a) Winding I : 100VA
(b) Winding II : 75VA
viii) Class of accuracy:
(a) Winding I : 0.2 as per IS 11448
(b) Winding II : 3P as per IS 11448/IEC
60044-2ix) Power frequency withstand voltage
for one minute : 28 KV
x) Standard impulse withstand voltage : 75 KV
xi) Fault level : 12.5 kA
xii) Rated short circuit withstand capability : 16.0kA for 1 sec
xiii) Class of insulation : A
xiv) Rated voltage factor : 1.2 – continuous,
1.5 for 30 seconds
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 23/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
3/14 Technical specification, Volume-II
Section –II (11KV VT)
5. DESIGN AND CONSTRUCTION:
Indoor Type: The current transformers shall be Three phase Dry (Epoxy Resin
Cast) type, suitable for the services indicated and conforming to the best modern
practice of design and manufacture. The transformer unit should be compatible withABB indoor type Circuit Breaker presently installed at NEIGRIHMS sub- station of
type (AL1/XLV). The design of current transformers shall be such that its accuracy
shall not be affected by the presence of pollution on the external surface of its
insulators.
The locations for installation of current transformers are situated in seismic zone - V.
The design and construction shall be such as to provide necessary protection against
the earthquake forces. Dampers and/or additional supporting structures may be
provided with the voltage transformers, if necessary, to cater for their operation in the
seismic zone.
Outdoor Type: The voltage transformers shall be complete in all respects
conforming to the modern practice for design and manufacture. The design of voltage
transformers shall be such that its accuracy shall not be affected by the presence of
pollution on the external surface of its insulators.
The locations for installation of voltage transformers are situated in seismic zone - V.
The design and construction shall be such as to provide necessary protection against
the earthquake forces. Dampers and/or additional supporting structures may be
provided with the voltage transformers, if necessary, to cater for their operation in the
seismic zone.
a. CORES:
The core shall be of high grade non-ageing, electrical silicon laminated steel
of low hysteresis and eddy current losses and high permeability to ensure high
accuracy at both normal and over voltages.
b. WINDINGS:
Primary windings: The primary winding of the voltage transformer shall be
connected in phase to neutral with the neutral point solidly earthed. Theneutral of the system is also solidly earthed. The primary winding shall be of
suitably insulated electrolytic copper wire.
Secondary windings: The voltage transformer shall be provided with two
separate secondary windings rated for 110V/√3 and 110V/√3. Suitably
insulated copper wire of electrolytic grade shall be used for secondary
windings.
c. TANK:
Each voltage transformer shall be supplied filled with insulating oil and shall
be hermetically sealed to prevent atmosphere from coming into contact withoil, avoid filtration and change of oil.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 24/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
4/14 Technical specification, Volume-II
Section –II (11KV VT)
The tank shall be fitted with oil gauge and provisions for convenient filling
and draining of oil. The oil gauge shall be mounted in such a way that the oil
level can be seen from the ground level.
Both expansion chamber and tank of the voltage transformer shall be made of high quality steel and shall be able to withstand full vacuum and pressure
occurring during transit, and thermal and mechanical stresses resulting from
maximum short circuit current during operation.
The tank shall be given three coats of rust preventing paint. Other ferrous parts
shall be hot-dip galvanised as per relevant standard.
The metal tank shall have bare minimum number of welded joints so as to
minimize possible locations of oil leakage.
Metal tank of the voltage transformer shall be provided with two separateearthing terminals for bolted connection to 50 x 8 mm m.s. flat to be provided
by the purchaser for connection to the station earth mat. The earthing
terminals shall be provided complete with adequate size washers, nuts and
bolts.
The voltage transformer shall be provided with suitable lifting arrangement for
lifting of the entire unit. The lifting arrangement (lifting eye) shall be
positioned such that the porcelain bushings and tank shall not be damaged
during lifting for transportation/installation.
The voltage transformer shall be constructed such that it can be easily transported to
site within the allowable transport limitation and in horizontal position, if the
transport limitations so demand.
6. BUSHING:
a. Oil filled condenser type porcelain bushings shall be used on the voltage
transformers. The porcelain shall be homogenous, thoroughly vitrified, tough
and impervious to moisture. The glazing of porcelain shall be of uniform
brown colour, free from blisters, burns and other similar defects. The bushings
shall have ample insulation, mechanical strength and rigidity for theconditions under which they will be used and shall be designed to prevent
accumulation of explosive gases and to provide adequate oil circulation to
remove internal heat. There shall be no undue stressing of any part of the
bushings due to temperature changes and adequate means shall be provided to
accommodate conductor expansion.
b. The bushings shall be so designed that when operating at the specified highest
system voltage there will be no electric discharge between the conductors and
bushings. No corrosion or injury would be cause to conductor, insulation or
supports by the formation of substances produced by chemical action. The
insulation of bushing shall be coordinated with that of the voltage transformer
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 25/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
5/14 Technical specification, Volume-II
Section –II (11KV VT)
such that flash-over will occur only externally to the voltage transformers. The
bushing should not cause radio disturbances when operated at rated voltage.
c. In general the bushings shall conform to the latest issue of IS: 2099 or
equivalent.
d. Each of the bushings shall be complete with the following fittings.
i. Bimetallic expansion type terminal connector.
ii. Oil level sight gauge and convenient means of filling, sampling and
drawing of oil.
iii. End shield for even distribution of stresses.
iv. Corona shields for bushing, if required.
7. TEMPERATURE RISE:
Potential transformers shall be capable of carrying their rated burden continuously at
rated voltage and frequency without the temperature rise exceeding the limits laid
down in the approved standard, to which they are designed and corrected to difference
in ambient temperature at site and that given in the standard. The temperature rise at
1.2 times rated primary voltage when applied continuously at rated frequency and at
rated burden shall not exceed the limits specified in the standard and the temperature
rise at 1.5 times rated primary voltage when applied for 30 seconds starting from
previous stable operation condition at rated frequency and rated burden shall not
exceed the temperature limits by more than 10°C.
8. PRESSURE RELIEVING DEVICE:
Each voltage transformers shall be provided with a pressure relieving device capable
of releasing abnormal internal pressure.
9. INSULATING OIL:
The quantity of the insulating oil for first filling of each potential transformer and the
complete specifications of oil proposed to be used shall be stated. The oil preferablyconforms to the requirement of latest IS: 335.
10. TERMINAL CONNECTORS:
Terminal connectors suitable for ACSR Panther conductors shall be supplied. Suitable
terminal connectors for earthing connections shall also be supplied.
11. TERMINAL BOX AND JUNCTION BOX:
Each voltage transformer shall be provided with one or more terminal boxes suitably
located to house the terminals of the two secondary windings. The terminal box shall be outdoor type, vermint proof and shall be provided with a door in front so as to have
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 26/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
6/14 Technical specification, Volume-II
Section –II (11KV VT)
easy access to the secondary terminals. The door shall have a sealing/locking
arrangement and shall be suitable to prevent penetration of moisture and rain water.
The terminal box shall be provided with removable gland plate and glands suitable for
1100 volts grade PVC insulated, PVC sheathed multi-core 2.5 sq. mm. to 6 sq. mm.
stranded copper conductor cable.
The terminal box, with the cover closed and tightened and the cable/conduit in
position when supplied shall have degree of protection not less than IP55 conforming
to latest issue of IS: 13947 (Part I).
Polarity shall be indelibly marked at the secondary terminals in the terminal box.
In addition to terminal box on each voltage transformer, tenderer shall also supply a
common junction box for each set of three voltage transformers of each circuit. The
junction box shall be weather proof type suitable for mounting on the steel structure.
Sufficient number of terminals shall be provided in the junction box for connecting
the leads from individual voltage transformer and formation of star or delta as
required and to relay metering in the control room.
13. MARKING:
i) RATING PLATE:
Each voltage transformer shall be provided with a non-corrosive and non-rusting
name and rating plate as per latest issue of IS: 3156 (Part-I). The plates shall have
information such as rated output, accuracy, terminal numbering of secondary
windings, as well, as the following indelibly marked on it.
a) Manufacturer’s name and country of origin.
b) Manufacturer’s serial number. c) Rated transformer ratio.
d) Rated frequency.
e) Rated output per phase and accuracy class.
f) Number of phase and method of connection.
g) Type of transformer
h)
Highest system voltagei) Insulation level
ii) TERMINAL MARKING:
The terminal marking shall identify.
a) The primary & secondary winding.
b) The winding section if any.
c) The relative polarities of windings.
iii) METHOD OF MARKING:
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 27/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
7/14 Technical specification, Volume-II
Section –II (11KV VT)
a) The terminals shall be marked clearly and indelibly either on the surface or
in their immediate vicinity.
b) The marking shall consist of letter followed by numbers.
14. TESTS:
ROUTINE TESTS:
Each voltage transformer shall be subjected to routine tests as specified in the latest
edition of IS: 3156 (Part I to III). If the purchaser wishes to have a representative,
tests shall be performed in his presence so as to be witnessed by him.
The routine tests shall consist of the following:
(a) Verification of terminal markings and polarity
(b) Power frequency tests on primary winding
(c) Power frequency test on secondary windings
(d) Determination of errors(e) Oil leakage test
TYPE TESTS:
The bidder shall furnish four sets of all the type test reports along with the offer. The
type tests must have been conducted less than five years from the date of opening of
bid. The Purchaser reserves the right to repeat the type tests in the presence of a
representative at the cost of the Supplier.
The type tests shall consist of the following:
(a) Verification of terminal markings and polarity
(b) Power frequency tests on primary winding
(c) Power frequency test on secondary windings
(d) Determination of errors
(e) Temperature rise test
(f) Impulse voltage test
(g) Degree of protection of secondary terminal box
(h) Partial discharge measurement
15.
DRAWING AND INSTRUCTION MANUAL:
The tenderer shall submit with the tender all the drawings to enable the purchaser to
assess the suitability of the equipment.
As soon as possible after the award of the contract, the manufacturer shall supply six
copies of following drawings which shall describe the equipment in full detail for
approval, and shall subsequently provide eight complete sets of final approved
drawings, one of which shall be auto positive/soft copy suitable for reproduction.
a) Outline dimensional drawings.
b) Assembly drawings.c) Cross sectional view of the voltage transformer.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 28/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
8/14 Technical specification, Volume-II
Section –II (11KV VT)
d) Foundation drawings.
e) Drawings showing the details of terminal connectors.
f) Magnetising curves.
g) Wiring diagram with polarity mark.
In addition to the above drawings, the tenderer may supply any other drawing, whichin his opinion is necessary to describe the equipment in full detail.
After the completion of the erection work, the contractor shall furnish seven sets
(including one soft copy) of the completed drawings.
Six copies of the instruction manual covering instruction for installation and
maintenance check tests shall be supplied by the contractor as part of this contract..
16. SPARE PARTS:
A list of the spare parts recommended for five years operation of the PT shall befurnished with the tender. The purchaser shall decide the actual quantity of spare parts
to be ordered on the basis of the list and the item wised prices of spare parts called for
in Schedule - III.
17. COMPLETENESS OF THE EQUIPMENT:-
The tenderer shall be complete in all respect and include all accessories which may
not be specifically mentioned in this specification but which are essential for the
completeness of the equipment ordered.
18. DEVIATION FROM SPECIFICATION:-
All deviations from the specification shall be separately listed as per proforma given
at Schedule - II, in absence of which it shall be presumed that the provisions of the
specification are complied with by the tenderer.
Leaflets to enable the satisfactory erection and commissioning of the equipment by
the purchaser. Such instructions shall reach the purchaser well in advance so that there
is no delay in commencement of erection. The successful tenderer shall supply all
special tools necessary for erection. Details of such tools and the prices thereof shall
be stated in the tender separately.
19. GUARANTEED & TECHNICAL PARTICULARS:-
Guaranteed technical particulars as called for in Schedule-I shall be furnished along
with the tender. Any tender lacking complete information in this respect is likely to be
rejected. Particulars which are subject to guarantee shall be clearly marked.
21. SCHEDULE OF INSTALLATION:-
Tenderer shall furnish a list of similar equipment supplied by him and presently inservice as per proforma given in schedule - IV.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 29/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
9/14 Technical specification, Volume-II
Section –II (11KV VT)
22. SCHEDULE OF REQUIREMENT:
Sl. No. Rated transformation
ratio/core Quantity1.0 Single phase 11000V/√3:
110V/√3 – 110V/√3Voltage transformer
complete with protection
fuses, terminal boxes and
terminal connectors as
detailed in specification.
(Indoor Type)
3 Nos
2.0 Single phase 11000V/√3:110V/√3 – 110V/√3Voltage transformer
complete with protection
fuses, terminal boxes and
terminal connectors as
detailed in specification.
(Outdoor Type)
3 Nos
23. PACKING & FORWARDING:
The equipment shall be packed in suitable crates so as to withstand handling duringtransport and outdoor storage. The supplier must be responsible for any damage to the
equipment during transit due, to improper and inadequate packing. Any material
found short/damaged shall be replaced by the supplier at no extra cost to the
purchaser.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 30/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
10/14 Technical specification, Volume-II
Section –II (11KV VT)
SCHEDULE-I
SCHEDULE OF GUARANTEED TECHNICAL PARTICULARS
1. Type
2. Manufacturers type designation.
3. Rated primary voltage. Volts.
4. Number of secondary winding
5. Rated secondary voltage Volts
Winding I
Winding II
6. Rated burden VA
Winding I
Winding II
7. Accuracy class
Winding I
Winding II
8. Temp rise at 1.2 times rated voltage and rated burden and frequency °C
9. Rated voltage factor at rated frequency, burden and time
10. Temp.rise for item 9 above. °C
11. One minute power frequency withstand test (dry) voltage on primary winding
KV(Rms)
12. One minute power frequency withstand test (wet) voltage on primary winding
KV(Rms)
13. 1.2/50 micro second impulse wave withstand test voltage KV(Peak)
14. One minute power frequency withstands test voltage on secondary winding
KV(Rms)
15. Bushing creepage distance (mm)
16. Variation in ration and phase angle error for variation in:
a) Voltage by 1%
b) Frequency by 1 Cycle
16. Whether corona shield is provided or not
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 31/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
11/14 Technical specification, Volume-II
Section –II (11KV VT)
17. (a )Weight of oil filling. Kg.
(b) Total weight. Kg.
(c) Overall dimension. mm
(d) Mounting detail
(e) Shipping dimension of largest package Kg
18. Enclose copies of test reports etc.
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 32/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
12/14 Technical specification, Volume-II
Section –II (11KV VT)
SCHEDULE - II
SCHEDULE OF DEVIATION BY THE TENDERER
1. General condition of contract.
Sl.
No
.
Specification Clause Deviation by the tenderer Justification
by the
tenderer
`1 2 3 4
2. Technical specification of contract.
Sl.No. Specification Clause
No.
Details of deviation Justification for
deviation.
-----------------------------------------------------------------------------
CERTIFICATE: The tenderer hereby certify that the above mentioned are the only deviation
from the purchaser specification.
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 33/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
13/14 Technical specification, Volume-II
Section –II (11KV VT)
SCHEDULE - III
SCHEDULE OF SPARE PARTS AND TOOLS
Sl.No. Description of spare parts Qty. Rate Amount
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 34/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
14/14 Technical specification, Volume-II
Section –II (11KV VT)
SCHEDULE-IV
SCHEDULE OF PRICES
(to be filled in by Tenderer)
Note : In addition to filling up this Schedule, the Tenderer shall attach separately a detailedlist of materials he is supplying.
S l . N o .
Description U n i t
Q u a n t i t y
E x - W o r k
R a t e ( P )
E x c i s e D u t y
( P )
T a x
( P )
F r e i g h t
&
I n s u r a n c e
( P )
U n i t R a t e
F O R
D e s t i n a t i o n
( P )
T o t a l
A m o u n t ( P )
( i )(ii) ( i i i )
( i v )
(v) (vi) (vii) (viii)
(ix)=(v)+
(vi)+(vii)+
(viii) ( x
) = ( i v )
x ( i x )
1 Outdoor Type: Single
phase 11000V/√3 :110V/√3 – 110V/√3voltage transformer
complete with
protection fuses,
terminal boxes,
junction boxes and
terminal connectors as
detailed in ‘Schedule of Requirements’
N o s .
2Indoor Type: Three
phase 11000V/√3110V/√3 – 110V/√3voltage transformer
complete with
protection fuses,
terminal boxes,
junction boxes and
terminal connectors asdetailed in ‘Schedule of Requirements’
S e t
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 35/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
1/16 Technical specification, Volume-II
Section –III (33KV CT)
TECHNICAL SPECIFICATION OF 33KV CURRENT TRANSFORMERS
1. SCOPE:
This specification covers the design, manufacture and assembly, testing at
manufacturer’s works site, supply& delivery at site of outdoor and indoor currenttransformer required for metering and current protection including differential
protection of transformer/distance protection of lines.
2. CLIMATIC CONDITION AT SITE:
The climatic conditions at site under which the current transformer shall operate are
as follows:
Maximum ambient temperature : 40° C
Minimum ambient temperature : - 5° C
Relative humidity : 62% to 89%
Average annual rainfall. : 2280 mm
No of months of tropical monsoon : 6 months (May to October)
Seismic Zone : V
Maximum altitude : Above 1000m above sea level.
3. STANDARDS:
The items shall conform in all respects to the following relevant standards/regulations
with latest amendments thereof:
Sl. No. Relevant Standards Title
1.0 IS 2705 (Part I to IV) Current transformers
2.0 IS 4201 Application guide for current transformers.
3.0 IS 2099 High voltage porcelain bushings4.0 IS 11322 Partial discharge measurement in instrument
transformer
5.0 IS 2071 Methods of high voltage testing
6.0 IS 335 Insulating oil
7.0 IS 13947 (Part I),
IS 12063
Degree of protection provided by enclosures for
low voltage switchgear and control
8.0 IEC 60044 - 1 Current transformers
9.0 IS 5561 Electric power connections – terminal
connectors
10.0 IS 4759 Hot dip zinc coatings on structural steel and
other allied products
11.0 IS 2633 Methods of testing weight, thickness and
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 36/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
2/16 Technical specification, Volume-II
Section –III (33KV CT)
uniformity of coating on hot dipped galvanised
articles
12.0 IS 13134/IEC 60815 Guide for selection of insulators in respect of
polluted conditions
Items matching with requirements of other national or international standards whichensure equal or better performance than the standards mentioned above may also be
considered. When the items offered by the supplier conforms to standards other than
those specified above, salient points of difference between the standards adopted and
standards specified in this specification shall be clearly brought out and a copy of
such standards shall invariably be furnished along with the offer.
4. TYPE AND RATING:
1. The current transformers shall be outdoor type, single phase, oil immersed,
self cooled and suitable for operation under the climatic conditions obtaining at site.
2. The current transformers shall have the following ratings:-
i) Nominal system voltage. 33 KV
ii) Highest system voltage. 36 KV
iii) No. of phases in the system. Three
iv) Earthing of system. Effectively earthed
v) Frequency 50 Hz ± 5%
vi) Rated short time thermal current 25.0kA for 1 sec
vii) Insulation level
a) 1.2/50 micro second lightning impulse
withstand voltage 170KVp
b ) 1 minute power frequency withstand
voltage 70KVrms
viii) Minimum creepage distance 900 mm
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 37/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
3/16 Technical specification, Volume-II
Section –III (33KV CT)
3. The current transformers of different ratings shall have the following
characteristics.
Sl.
No.
Rated
transformation
ratio/core
Accuracy
class at
all ratios
Rated
Burden
at allratios
Accuracy limit
factor/instrument
security factor atall ratios
Knee point
voltage at
all ratios Purpose.
1.0 1600-1000
/1/1/1A
Core-I 0.2s/ as
per IS std
meeting
CEA
regulation
30 VA ISF ≤ 3.5 - Metering
Core-II 5P 30 VA ALF : 10 -O/C & E/F
protection.
Core-III PS - - 40R CT + 155Differential
protection
2.0 800-400
/1/1/1A
Core-I 0.2s/ as
per IS std
meeting
CEA
regulation
30 VA ISF ≤ 3.5 - Metering
Core-II 5P 30 VA ALF : 10 -O/C & E/F
protection.
Core-III PS - - 40R CT + 155Differential
protection
3.0 600-300
/1/1/1A
Core-I 0.2s/ as
per IS std
meeting
CEA
regulation
30 VA ISF ≤ 3.5 - Metering
Core-II 5P 30 VA ALF : 10 - O/C & E/F protection.
Core-III PS - - 40R CT + 155Differential
protection
4.0 200-100
/1/1/1A
Core-I 0.2s 30 VA ISF ≤ 3.5 - Metering
Core-II 5P 30 VA ALF : 10 -O/C & E/F
protection.
Core-III PS - - 40R CT + 155Differential
protection
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 38/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
4/16 Technical specification, Volume-II
Section –III (33KV CT)
4. The characteristics of the core classified as PS of the above CT are based on
certain protections assumed and expected to hold good. In case need arises to co-
ordinate any of these characteristics, especially the knee point voltage of the core in
the light of control and relay equipment to be finalized, the tenderer shall keep this
point in view while submitting his offer.
5. TEMPERATURE RISE:
Current transformers shall be capable of carrying their rated primary and secondary
current continuously without any temperature rise exceeding the limits as laid down in
the approved standard to which they are designed and corrected to the difference in
ambient temperature at site and that given in the standard. They shall withstand the
thermal, electrical and mechanical stresses caused by specified symmetrical RMS
breaking current for one second corresponding to a rupturing capacity of 25.0kA for
33 KV circuit breakers.
6. DESIGN FEATURES:
01. GENERAL:
The current transformers shall be single phase, oil immersed and self cooled
type, suitable for the services indicated and conforming to the best modern
practice of design and manufacture. The design of current transformers shall
be such that its accuracy shall not be affected by the presence of pollution on
the external surface of its insulators.
The locations for installation of current transformers are situated in seismic
zone - V. The design and construction shall be such as to provide necessary
protection against the earthquake forces. Dampers and/or additional
supporting structures may be provided with the voltage transformers, if
necessary, to cater for their operation in the seismic zone.
02. CORES:
The cores for the current transformers shall be of high grade non-ageing
electrical silicon laminated steel of low hysteresis loss and high permeability
to ensure high accuracy at both normal and over current.
The cores to be used for metering and indicating instruments shall have a
saturation factor low enough not to cause any damage to meters and
instruments in the event of maximum short circuit currents.
The cores to be used for distance protection and differential protection shall
have a high saturation factor. Magnetisation characteristics curves of these
cores shall be furnished along with the bid.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 39/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
5/16 Technical specification, Volume-II
Section –III (33KV CT)
03. WINDINGS:
Primary winding consisting of suitable number and size of conductors shall be
insulated with special paper having high mechanical strength, high electrical
withstand properties and good ageing qualities. The primary winding shall be
of suitably insulated electrolytic copper wire.
The rating of the secondary windings shall be one/five Ampere. The secondary
terminal shall be brought out in a compartment for easy access. The secondary
terminals shall be provided with shorting arrangements. The secondary taps
shall be adequately reinforced to withstand the normal handling without
damage. Suitably insulated copper wire of electrolytic grade shall be used for
secondary windings.
04. TANK:
Each current transformer shall be of Live Tank type to be supplied filled withinsulating oil and shall be hermetically sealed to prevent atmosphere from
coming into contact with oil, avoid filtration and change of oil. In case, the
tenderer intends to use nitrogen or any other inert gas above the oil level as to
permit expansion and contraction of oil, the same shall be stated in the tender.
Both expansion chamber and tank of the current transformer shall be made of
high quality steel and shall be able to withstand full vacuum and pressure
occurring during transit, and thermal and mechanical stresses resulting from
maximum short circuit current during operation.
All interiors or exteriors of tanks, secondary box and other metal parts shall be
thoroughly cleaned to remove all rust, scales, corrosion, grease or other
adhering foreign matters. All steel surfaces in contact with insulating oil as far
as accessible shall be painted with not less than two coats of heat resistant oil
insulating varnish. Steel surface exposed to atmosphere if not hot dip
galvanised shall be given a priming coat of zinc chromate and two coats of
light grey rust preventing paint. Other ferrous parts shall be hot-dip galvanised
as per relevant standard.
The metal tank shall have bare minimum number of welded joints so as to
minimize possible locations of oil leakage.
Metal tank of the current transformer shall be provided with two separate
earthing terminals for bolted connection to 50 x 6 mm m.s. flat to be provided
by the purchaser for connection to the station earth mat. The earthing
terminals shall be provided complete with adequate size washers, nuts and
bolts.
The current transformer shall be provided with suitable lifting arrangement for
lifting of the entire unit. The lifting arrangement (lifting eye) shall be
positioned such that the porcelain bushings and tank shall not be damaged
during lifting for transportation/installation.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 40/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
6/16 Technical specification, Volume-II
Section –III (33KV CT)
05. TERMINAL CONNECTORS:
Appropriate number of terminal connectors suitable for ACSR
Panther/Wolf/Raccoon conductor shall be supplied. Suitable terminal
connectors for earth connections shall also be supplied.
06. BUSHINGS:
The bushing and terminal insulator, where provided for the current
transformer shall conform to the latest edition of IS: 2099. The bushings shall
be made of homogeneous, vitreous porcelain of high mechanical and dielectric
strength. Glazing of porcelain shall be of uniform brown or dark brown colour
with smooth surface, arranged to shed away rain water or condensed water
particles.
The bushings shall have ample insulation, mechanical strength and rigidity for
the conditions under which they will be used and shall be designed to preventaccumulation of explosive gases and to provide adequate oil circulation to
remove internal heat. There shall be no undue stressing of any part of the
bushings due to temperature changes and adequate means shall be provided to
accommodate conductor expansion.
The bushings shall be so designed that when operating at the specified highest
system voltage there will be no electric discharge between the conductors and
bushings. No corrosion or injury would be cause to conductor, insulation or
supports by the formation of substances produced by chemical action. The
insulation of bushing shall be coordinated with that of the current transformer
such that flash-over will occur only externally to the current transformers. The
bushing should not cause radio disturbances when operated at rated voltage.
07. TERMINAL BOX AND JUNCTION BOX:
All secondary terminals shall be brought out in a weatherproof terminal box
on one side of each current transformer. The exterior of this terminal box shall
be hot dip galvanised. A terminal board for short circuiting of secondary
terminals shall be provided.
Cable box alongwith necessary glands for receiving control cables suitable for mounting on the bottom plate of the terminal box shall be included in the
scope of supply.
A door with locking arrangements shall be provided in the front of the
terminal box so as to permit easy access to the secondary terminals. The door
shall have suitable arrangement to check ingress of moisture into the terminal
box.
All terminals shall be clearly marked with identification number to facilitate
connection to external wiring.
Polarity shall be indelibly marked on each primary and secondary terminal.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 41/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
7/16 Technical specification, Volume-II
Section –III (33KV CT)
In addition to terminal box on each current transformer, tenderer shall also
supply a common junction box for each set of three current transformers of
each circuit. The junction box shall be weather proof type suitable for
mounting on the steel structure.
The terminal boxes and junction boxes shall be suitable for outdoor installation and shall conform to IP55 protection class.
08. OIL LEVEL GAUGE:
An oil level gauge shall be provided in indicate the oil level in the current
transformer. The oil gauge shall be mounted in such a way that the oil level
can be seen from the ground level.
09. PRESSURE RELIEVING DEVICES:
Each current transformer shall be provided with a pressure relieving device soas to prevent bursting of current transformer even under unfavourable
conditions.
10. OIL DRAIN COCK:
An oil drain cock alongwith a stop cock shall be provided in the bottom
flange so as to permit taking of oil samples for testing.
11. OIL FILLING COCK:
An oil filling cock along with a stop cock shall be provided for filling the oil
in the current transformer.
7. MOUNTING STRUCTURES:
The current transformers shall be mounted on steel structures, at a height of 2.5m
from ground level. The tenderer shall ensure that the CTs supplied can be mounted on
the existing steel (galvanized) structures. Necessary connecting materials, such as
clamps, bolts, nuts, washers, etc. as well as foundation bolts for the supporting
structures shall be supplied by the tenderer.
8. RATING PLATE:
Each current transformer shall be provided with a non-corrosive rating plate in
accordance with latest edition of IS: 2705 Part-I. Following additional particulars
shall also be marked on the rating plate of each current transformer.
a) Purpose (measurement or protection), rated output at 0.9 PF lagging, rated
accuracy factor and rated class of accuracy of each secondary winding in
terms of IS: 2705.
b) Terminal numbering of each secondary winding.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 42/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
8/16 Technical specification, Volume-II
Section –III (33KV CT)
c) Knee point voltage.
d) Maximum exciting current at knee point voltage.
e) Secondary winding resistance at 75°C.
f) Rated instrument security factor in respect of winding meant for measurement
and metering.
9. INSULATING OIL:
The quantity of oil for first filling of each CT and the complete specifications of oil
proposed to be used shall be stated. It would be desirable to use oil conforming to the
provisions of latest IS: 335.
10. TESTS:
ROUTINE TESTS:
Each current transformer shall be subjected to routine tests as specified in the latest
edition of IS: 2705 (Part I to IV). If the purchaser wishes to have a representative,
tests shall be performed in his presence so as to be witnessed by him.
The routine tests shall consist of the following:
(a) Verification of terminal markings and polarity
(b) Power frequency dry withstand tests on primary winding
(c) Power frequency dry withstand test on secondary windings
(d) Over voltage inter-turn test
(e) Determination of errors or other characteristics according to the
requirements of the appropriate designation or accuracy class as per
individual parts of IS: 2705.
(f)
Knee-point voltage and exciting current for PS Class cores
(g) Secondary winding resistance for PS Class cores
(h) Turns ratio for PS Class cores
TYPE TESTS:
The bidder shall furnish four sets of all the type test reports from CPRI or other
accredited laboratories along with the offer. The type tests must have been conducted
less than five years from the date of opening of bid. The Purchaser reserves the right
to repeat the type tests in the presence of a representative at the cost of the Supplier.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 43/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
9/16 Technical specification, Volume-II
Section –III (33KV CT)
The type tests shall be in accordance with the latest edition of IS: 2705 (Part I to IV),
and shall consist of the following:
(a) Short-time current tests
(b) High voltage power frequency wet withstand test
(c) Determination of errors or other characteristics according to the
requirements of the appropriate designation or accuracy class as per
individual parts of IS: 2705.
(d) Temperature rise test
(e) Lightning impulse voltage test
(f) Degree of protection tests of secondary terminal, junction box
All the test reports shall be submitted and got approved by the purchaser, before
despatch of the equipment.
SPECIAL TESTS:
The special tests shall consist of the following:
a. Chopped lightning impulse test as a type test
b. Mechanical test
11. DRAWINGS AND INSTRUCTION MANUALS:
The tenderer shall submit, with the tender, all the drawings enumerated in this
specification to enable to purchaser to assess the suitability of equipments.
As soon as possible after the award of the contract, the manufacturer shall supply six
copies of the following drawings which shall describe the equipment in full details for
approval and shall subsequently provide eight complete sets of final approved
drawings, one of which shall be auto positive/soft copy suitable for reproduction.
i. Outline dimensional drawings.
ii. Assembly Drawings.
iii. Cross sectional view of the current transformer.
iv. Drawings giving details of supporting structures and foundation.
v. Drawing showing the details of terminal connectors.
vi. Magnetising curves.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 44/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
10/16 Technical specification, Volume-II
Section –III (33KV CT)
vii. Wiring diagram with polarity mark.
In addition to the above drawings, the tenderer may supply any other drawing, which
in his opinion is required to describe the equipment in full details.
After the completion of the erection work, the contractor shall furnish seven sets
(including one reproducible on soft copy) of the completion drawings. Six copies of
instruction manuals covering instruction for installation and maintenance check tests
shall be supplied by the contractor as a part of this contract.
12. SPARE PARTS:
A list of spare parts recommended for five years operation for the current
transformers shall be furnished with the tender. The purchaser shall decide the actual
quantity of spare parts to be ordered on the basis of the list and the item-wised prices
of spare parts called for in Schedule-V.
13. COMPLETENESS OF EQUIPMENT:
The tenderer shall be complete in all respect and include all accessories which may
not be specifically mentioned in this specification but which are essential for the
completeness of equipment ordered.
14. DEVIATIONS FROM SPECIFICATIONS:
All deviations from the specification shall be separately listed as per proforma given
in Schedule-III, in the absence of which it shall be presumed that the provisions of the
specification are complied with by the tenderer.
15. ERECTION AND SUPERVISION:
The purchaser may at his discretion ask the tenderer to do either the complete erection
or supervision of erection at site of the equipment covered by this specification. The
tenderer shall, therefore, quote their charges separately for (i) erection and (ii) rates
for supervision of erection.
However, if it is decided to do the erection of the above equipment departmentally,the tenderer shall furnish full and detailed instructions complete with drawings and
leaflets to enable the satisfactory erection and commissioning of the equipment by the
purchaser. Such instructions shall reach the purchaser well in advance so that there is
no delay in commencement of erection. The successful tenderer shall supply all
special tools necessary for erection. Details of such tools and the price thereof shall be
stated in the tender separately.
16. GUARANTEED TECHNICAL PARTICULARS:
Guaranteed technical particulars as called for in Schedule-I shall be furnished
alongwith the tender. Any tender lacking the complete information in this respect is
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 45/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
11/16 Technical specification, Volume-II
Section –III (33KV CT)
likely to be rejected. Particulars which are not subject to guarantee shall be clearly
marked.
17. SCHEDULE OF INSTALLATION:
Tenderer shall furnish a list of similar equipment supplied by him and presently inservice as per proforma given in Schedule-IV.
18. PACKING & FORWARDING:
The equipment shall be packed in suitable crates so as to withstand handling during
transport and outdoor storage. The supplier must be responsible for any damage to the
equipment during transit due, to improper and inadequate packing. Any material
found short/damaged shall be replaced by the supplier at no extra cost to the
purchaser.
19. SCHEDULE OF REQUIREMENTS:
1. 33 KV single phase, outdoor type current transformers as specified in the
specification above and rating details as per Clause 4.3 and as mentioned below:
Sl. No. Rated transformation
ratio/coreQuantity
1.0 1600-800/1/1/1/A 3 Nos
2.0 800-400/1/1/1/A 48 Nos3.0 600-300/1/1/1/A 12 Nos
4.0 200-100/1/1/1/A 15 Nos
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 46/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
12/16 Technical specification, Volume-II
Section –III (33KV CT)
SCHEDULE-I
GUARANTEED TECHNICAL PARTICULARS
(The Tenderer shall furnish separate GTPs for different CT ratings)
1. Manufacturer’s name and country of origin:
2. Manufacturer’s type, designation and model:
3. Current transformers data: Core-I Core-II Core-III Core-IV
a. Rated primary current (A):
b. Rated secondary current (A):
c. Transformation ratio:
d. Rated output at 0.9
lagging PF (VA):
e. Class of accuracy:
f. Accuracy limit factor:
g. Knee point voltage (V):
h. Excitation current at
knee point voltage (mA):
i. Secondary limiting voltage:
j. Resistance of secondary winding
at 75°C (Ω):
4. Nominal rated voltage (KV):
5. Maximum voltage of operation (KV):
6. One second over-current factor
(times rated current):
7. Short time thermal rating for:
a) One second. kA (rms):
b) Three seconds kA (rms):
8. Rated dynamic current (Peak value):
9. Instrument security factor for the windingmeant for measurement and metering:
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 47/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
13/16 Technical specification, Volume-II
Section –III (33KV CT)
10. Rated continuous thermal current
and corresponding temperature rise (kA°C):
11. Creepage distance (mm):
12. One minute power frequency dry
withstand test voltage - KV(rms):
13. One minute power frequency wet
withstand test voltage - KV(rms):
14. 1.2/50 micro second full wave
impulse withstand test voltage - KV(Peak):
15 Weight of oil per CT (Kg):
16 Class of oil:
17 Whether pressure relief device
provided (Yes/No):
18 Total weight per C.T. (Kg):
19 Magnetisation curves of C.T.cores
supplied with tender and total
drawing Nos. attached:
20 Overall dimensions (mm x mm x mm):
21 Mounting details:
22 Shipping dimensions of largest package
(mm x mm x mm):
23 Shipping weight of heaviest package (Kg):
24
Enclosed copies of test reports etc:
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 48/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
14/16 Technical specification, Volume-II
Section –III (33KV CT)
SCHEDULE-II
SCHEDULE OF PRICES
(to be filled in by Tenderer)
Note : In addition to filling up this Schedule, the Tenderer shall attach separately a detailedlist of materials he is supplying.
S l . N o .
Description U n i t
Q u a n t i t y
E x - W o r k
R a t e ( P )
E x c i s e D u t y
( P )
T a x
( P )
F r e i g h t
&
I n s u r a n c e
( P )
U n i t R a t e
F O R
D e s t i n a t i o n
( P )
T o t a l
A m o u n t ( P )
( i ) (ii) ( i i i ) ( i v )
(v) (vi) (vii) (viii)
(ix)=(v)+
(vi)+(vii)+
(viii) ( x
) = ( i v )
x ( i x )
1 33KV single phase,
outdoor, oil filled current
transformer complete
with terminal boxes,
junction boxes and
terminal connectors as
detailed in ‘Schedule of
Requirements’
A 1600-1000/1/1/1/A N o s
3
B 800-400/1/1/1/A N o s
48
C 600-300/1/1/1/A N o s
12
D 200-100/1/1/1 A N o s
15
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 49/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
15/16 Technical specification, Volume-II
Section –III (33KV CT)
SCHEDULE-III
SCHEDULE OF DEVIATION FROM SPECIFICATION
Sl. No. Specification Clause No. Details of deviation Justification for deviation.
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 50/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
16/16 Technical specification, Volume-II
Section –III (33KV CT)
SCHEDULE-IV
SCHEDULE OF SPARE PARTS AND TOOLS
Sl.
No.
Description of Spare Parts Quantity Rate Amount
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 51/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
1/16 Technical specification, Volume-II
Section –V (33KV VT)
SPECIFICATION OF 33KV VOLTAGE TRANSFORMER (FOR METERING AND
PROTECTION)
1. SCOPE:
This specification covers the design, manufacture, assembly, testing at manufacturer’sworks, supply, delivery at site, erection, testing and commissioning of outdoor voltage
transformers required for 33 KV Sub-Stations.
2. CLIMATIC CONDITION :
The climatic conditions at site under which the voltage transformer shall operate are
as follows:
Maximum ambient temperature : 40° C
Minimum ambient temperature : - 5° C
Relative humidity : 62% to 89%
Average annual rainfall. : 2280 mm
No of months of tropical monsoon : 5 months (May to October)
Seismic Zone : V
Maximum altitude : Above 1000m above sea level.
3. STANDARDS:
The items shall conform in all respects to the following relevant standards/regulations
with latest amendments thereof:
Sl. No. Relevant Standards Title
1.0 IS 3156 (Part I to III) Voltage transformers
2.0 IS 4146 Application guide for voltage transformers.
3.0 IS 2099 High voltage porcelain bushings
4.0 IS 11322 Partial discharge measurement in instrumenttransformer
5.0 IS 2071 Methods of high voltage testing
6.0 IS 335 Insulating oil
7.0 IS 13947 (Part I),
IS 12063
Degree of protection provided by enclosures for
low voltage switchgear and control
8.0 IEC 60044 - 2 Voltage transformers
9.0 IS 5561 Electric power connections – terminal
connectors
10.0 IS 4759 Hot dip zinc coatings on structural steel and
other allied products
11.0 IS 2633 Methods of testing weight, thickness and
uniformity of coating on hot dipped galvanised
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 52/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
2/16 Technical specification, Volume-II
Section –V (33KV VT)
articles
12.0 IS 13134 Guide for selection of insulators in respect of
polluted conditions
Items matching with requirements of other national or international standards which
ensure equal or better performance than the standards mentioned above may also beconsidered. When the items offered by the supplier conforms to standards other than
those specified above, salient points of difference between the standards adopted and
standards specified in this specification shall be clearly brought out and a copy of
such standards shall invariably be furnished along with the offer.
4. TYPE AND RATING:
a. The voltage transformer shall be single phase, oil immersed; self cooled core
type suitable for outdoor operation, effectively earthed under the climatic condition as
given in this specification.
b. The voltage transformers shall have the following ratings:
i) Normal system voltage : 33 KV
ii) Highest system voltage : 36 KV
iii) Frequency : 50 Hz ± 5%
iv) System of earthing : Effectively earthed
v) Ratio : 33/√3 KV: 110V/√3V-110V/√3
vi) No. of secondary windings : Two
vii) Rated burden:
(a) Winding I : 100VA
(b) Winding II : 75VA
viii) Class of accuracy:
(a) Winding I 0.2 as per IS 11448
(b) Winding II : 3P as per IS 11448/IEC
60044-2ix) Power frequency withstand voltage
for one minute : 70 KV
x) Standard impulse withstand voltage : 170 KV
xi) Fault level : 20.0kA
xii) Rated short circuit withstand capability : 25.0kA for 1 sec
xiii) Class of insulation : A
xiv) Rated voltage factor : 1.2 – continuous,
1.5 for 30 seconds
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 53/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
3/16 Technical specification, Volume-II
Section –V (33KV VT)
5. DESIGN AND CONSTRUCTION:
The voltage transformers shall be complete in all respects conforming to the modern
practice for design and manufacture. The design of voltage transformers shall be such
that its accuracy shall not be affected by the presence of pollution on the externalsurface of its insulators.
The locations for installation of voltage transformers are situated in seismic zone - V.
The design and construction shall be such as to provide necessary protection against
the earthquake forces. Dampers and/or additional supporting structures may be
provided with the voltage transformers, if necessary, to cater for their operation in the
seismic zone.
a. CORES:
The core shall be of high grade non-ageing, electrical silicon laminated steelof low hysteresis and eddy current losses and high permeability to ensure high
accuracy at both normal and over voltages.
b. WINDINGS:
Primary windings: The primary winding of the voltage transformer shall be
connected in phase to neutral with the neutral point solidly earthed. The
neutral of the system is also solidly earthed. The primary winding shall be of
suitably insulated electrolytic copper wire.
Secondary windings: The voltage transformer shall be provided with two
separate secondary windings rated for 110V/√3 and 110V/√3. Suitably
insulated copper wire of electrolytic grade shall be used for secondary
windings.
c. TANK:
Each voltage transformer shall be supplied filled with insulating oil and shall
be hermetically sealed to prevent atmosphere from coming into contact with
oil, avoid filtration and change of oil.
The tank shall be fitted with oil gauge and provisions for convenient filling
and draining of oil. The oil gauge shall be mounted in such a way that the oil
level can be seen from the ground level.
Both expansion chamber and tank of the voltage transformer shall be made of
high quality steel and shall be able to withstand full vacuum and pressure
occurring during transit, and thermal and mechanical stresses resulting from
maximum short circuit current during operation.
The tank shall be given three coats of rust preventing paint. Other ferrous parts
shall be hot-dip galvanised as per relevant standard.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 54/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
4/16 Technical specification, Volume-II
Section –V (33KV VT)
The metal tank shall have bare minimum number of welded joints so as to
minimize possible locations of oil leakage.
Metal tank of the voltage transformer shall be provided with two separate
earthing terminals for bolted connection to 50 x 8 mm m.s. flat to be provided
by the purchaser for connection to the station earth mat. The earthingterminals shall be provided complete with adequate size washers, nuts and
bolts.
The voltage transformer shall be provided with suitable lifting arrangement for
lifting of the entire unit. The lifting arrangement (lifting eye) shall be
positioned such that the porcelain bushings and tank shall not be damaged
during lifting for transportation/installation.
The voltage transformer shall be constructed such that it can be easily transported to
site within the allowable transport limitation and in horizontal position, if the
transport limitations so demand.
6. BUSHING:
a. Oil filled condenser type porcelain bushings shall be used on the voltage
transformers. The porcelain shall be homogenous, thoroughly vitrified, tough
and impervious to moisture. The glazing of porcelain shall be of uniform
brown colour, free from blisters, burns and other similar defects. The bushings
shall have ample insulation, mechanical strength and rigidity for the
conditions under which they will be used and shall be designed to prevent
accumulation of explosive gases and to provide adequate oil circulation to
remove internal heat. There shall be no undue stressing of any part of the
bushings due to temperature changes and adequate means shall be provided to
accommodate conductor expansion.
b. The bushings shall be so designed that when operating at the specified highest
system voltage there will be no electric discharge between the conductors and
bushings. No corrosion or injury would be cause to conductor, insulation or
supports by the formation of substances produced by chemical action. The
insulation of bushing shall be coordinated with that of the voltage transformer
such that flash-over will occur only externally to the voltage transformers. The
bushing should not cause radio disturbances when operated at rated voltage.
c. In general the bushings shall conform to the latest issue of IS: 2099 or
equivalent.
d. Each of the bushings shall be complete with the following fittings.
i. Bimetallic expansion type terminal connector.
ii. Oil level sight gauge and convenient means of filling, sampling and
drawing of oil.
iii. End shield for even distribution of stresses.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 55/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
5/16 Technical specification, Volume-II
Section –V (33KV VT)
iv. Corona shields for bushing, if required.
7. TEMPERATURE RISE:
Potential transformers shall be capable of carrying their rated burden continuously atrated voltage and frequency without the temperature rise exceeding the limits laid
down in the approved standard, to which they are designed and corrected to difference
in ambient temperature at site and that given in the standard. The temperature rise at
1.2 times rated primary voltage when applied continuously at rated frequency and at
rated burden shall not exceed the limits specified in the standard and the temperature
rise at 1.5 times rated primary voltage when applied for 30 seconds starting from
previous stable operation condition at rated frequency and rated burden shall not
exceed the temperature limits by more than 10°C.
8. PRESSURE RELIEVING DEVICE:
Each voltage transformers shall be provided with a pressure relieving device capable
of releasing abnormal internal pressure.
9. INSULATING OIL:
The quantity of the insulating oil for first filling of each potential transformer and the
complete specifications of oil proposed to be used shall be stated. The oil preferably
conforms to the requirement of latest IS: 335.
10. MOUNTING STRUCTURES:
The voltage transformers shall be mounted on steel structures. The tenderer shall
quote separately for the supporting structures of 2.5m high each. Necessary
connecting materials, such as clamps, bolts, nuts, washers, etc. and foundation bolts
for mounting the equipment on the supporting structures shall be galvanised and shall
be supplied by the tenderer.
11. TERMINAL CONNECTORS:
Terminal connectors suitable for ACSR Panther conductors shall be supplied. Suitable
terminal connectors for earthing connections shall also be supplied.
12. TERMINAL BOX AND JUNCTION BOX:
Each voltage transformer shall be provided with one or more terminal boxes suitably
located to house the terminals of the two secondary windings. The terminal box shall
be outdoor type, vermint proof and shall be provided with a door in front so as to have
easy access to the secondary terminals. The door shall have a sealing/locking
arrangement and shall be suitable to prevent penetration of moisture and rain water.
The terminal box shall be provided with removable gland plate and glands suitable for
1100 volts grade PVC insulated, PVC sheathed multi-core 2.5 sq. mm. to 6 sq. mm.stranded copper conductor cable.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 56/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
6/16 Technical specification, Volume-II
Section –V (33KV VT)
The terminal box, with the cover closed and tightened and the cable/conduit in
position when supplied shall have degree of protection not less than IP55 conforming
to latest issue of IS: 13947 (Part I).
Polarity shall be indelibly marked at the secondary terminals in the terminal box.
In addition to terminal box on each voltage transformer, tenderer shall also supply a
common junction box for each set of three voltage transformers of each circuit. The
junction box shall be weather proof type suitable for mounting on the steel structure.
Sufficient number of terminals shall be provided in the junction box for connecting
the leads from individual voltage transformer and formation of star or delta as
required and to relay metering in the control room.
13. MARKING:
i) RATING PLATE:
Each voltage transformer shall be provided with a non-corrosive and non-rusting
name and rating plate as per latest issue of IS: 3156 (Part-I). The plates shall have
information such as rated output, accuracy, terminal numbering of secondary
windings, as well, as the following indelibly marked on it.
a) Manufacturer’s name and country of origin. b) Manufacturer’s serial number. c) Rated transformer ratio.
d) Rated frequency.
e) Rated output per phase and accuracy class.
f) Number of phase and method of connection.
g) Type of transformer
h) Highest system voltage
i) Insulation level
ii) TERMINAL MARKING:
The terminal marking shall identify.
a)
The primary & secondary winding. b) The winding section if any.
c) The relative polarities of windings.
iii) METHOD OF MARKING:
a) The terminals shall be marked clearly and indelibly either on the surface or
in their immediate vicinity.
b) The marking shall consist of letter followed by numbers.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 57/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
7/16 Technical specification, Volume-II
Section –V (33KV VT)
14. TESTS:
ROUTINE TESTS:
Each voltage transformer shall be subjected to routine tests as specified in the latest
edition of IS: 3156 (Part I to III). If the purchaser wishes to have a representative,tests shall be performed in his presence so as to be witnessed by him.
The routine tests shall consist of the following:
(a) Verification of terminal markings and polarity
(b) Power frequency tests on primary winding
(c) Power frequency test on secondary windings
(d) Determination of errors
(e) Oil leakage test
TYPE TESTS:
The bidder shall furnish four sets of all the type test reports along with the offer. The
type tests must have been conducted less than five years from the date of opening of
bid. The Purchaser reserves the right to repeat the type tests in the presence of a
representative at the cost of the Supplier.
The type tests shall consist of the following:
(a) Verification of terminal markings and polarity
(b) Power frequency tests on primary winding
(c) Power frequency test on secondary windings
(d) Determination of errors
(e) Temperature rise test
(f) Impulse voltage test
(g) Degree of protection of secondary terminal box
(h) Partial discharge measurement
15. DRAWING AND INSTRUCTION MANUAL:
The tenderer shall submit with the tender all the drawings to enable the purchaser to
assess the suitability of the equipment.
As soon as possible after the award of the contract, the manufacturer shall supply six
copies of following drawings which shall describe the equipment in full detail for
approval, and shall subsequently provide eight complete sets of final approved
drawings, one of which shall be auto positive/soft copy suitable for reproduction.
a) Outline dimensional drawings.
b) Assembly drawings.
c) Cross sectional view of the voltage transformer.
d) Foundation drawings.
e) Drawings showing the details of terminal connectors.
f) Magnetising curves.g) Wiring diagram with polarity mark.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 58/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
8/16 Technical specification, Volume-II
Section –V (33KV VT)
In addition to the above drawings, the tenderer may supply any other drawing, which
in his opinion is necessary to describe the equipment in full detail.
After the completion of the erection work, the contractor shall furnish seven sets
(including one soft copy) of the completed drawings.
Six copies of the instruction manual covering instruction for installation and
maintenance check tests shall be supplied by the contractor as part of this contract..
16. SPARE PARTS:
A list of the spare parts recommended for five years operation of the PT shall be
furnished with the tender. The purchaser shall decide the actual quantity of spare parts
to be ordered on the basis of the list and the item wised prices of spare parts called for
in Schedule - III.
17. COMPLETENESS OF THE EQUIPMENT:-
The tenderer shall be complete in all respect and include all accessories which may
not be specifically mentioned in this specification but which are essential for the
completeness of the equipment ordered.
18. DEVIATION FROM SPECIFICATION:-
All deviations from the specification shall be separately listed as per proforma given
at Schedule - II, in absence of which it shall be presumed that the provisions of the
specification are complied with by the tenderer.
19. ERECTION & SUPERVISION:-
The purchaser may at his discretion ask the tenderer to do either the complete erection
or supervision of erection at site of the equipment covered by this specification. The
tenderer shall, therefore, quote their charges separately for (i) erection and (ii) rates
for supervision of erection.
However, if it is decided to the erection of the above equipment departmentally, the
tenderer shall furnish full and detailed instructions complete with drawings andleaflets to enable the satisfactory erection and commissioning of the equipment by the
purchaser. Such instructions shall reach the purchaser well in advance so that there is
no delay in commencement of erection. The successful tenderer shall supply all
special tools necessary for erection. Details of such tools and the prices thereof shall
be stated in the tender separately.
20. GUARANTEED & TECHNICAL PARTICULARS:-
Guaranteed technical particulars as called for in Schedule-I shall be furnished along
with the tender. Any tender lacking complete information in this respect is likely to be
rejected. Particulars which are subject to guarantee shall be clearly marked.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 59/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
9/16 Technical specification, Volume-II
Section –V (33KV VT)
21. SCHEDULE OF INSTALLATION:-
Tenderer shall furnish a list of similar equipment supplied by him and presently in
service as per proforma given in schedule - IV.
22. SCHEDULE OF REQUIREMENT:
Sl. No. Rated transformation ratio/core Quantity
1 Single phase 33000V/√3 : 110V/√3 – 110V/√3voltage transformer complete with protection
fuses, terminal boxes and terminal connectors
as detailed in specification.
39 Nos
2 Junction box with sufficient numbers of
terminals as detail in specification
3 Steel mounting structures for the above voltage
transformer
4 Special tools for erection
5 Spares as recommended for satisfactory
operation
23. PACKING & FORWARDING:
The equipment shall be packed in suitable crates so as to withstand handling during
transport and outdoor storage. The supplier must be responsible for any damage to the
equipment during transit due, to improper and inadequate packing. Any material
found short/damaged shall be replaced by the supplier at no extra cost to the purchaser.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 60/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
10/16 Technical specification, Volume-II
Section –V (33KV VT)
SCHEDULE-I
SCHEDULE OF GUARANTEED TECHNICAL PARTICULARS
1. Type
2. Manufacturers type designation.
3. Rated primary voltage. Volts.
4. Number of secondary winding
5. Rated secondary voltage Volts
Winding I
Winding II
6. Rated burden VAWinding I
Winding II
7. Accuracy class
Winding I
Winding II
8. Temp rise at 1.2 times rated voltage and rated burden and frequency °C
9. Rated voltage factor at rated frequency, burden and time
10. Temp.rise for item 9 above. °C
11. One minute power frequency withstand test (dry) voltage on primary winding
KV(Rms)
12. One minute power frequency withstand test (wet) voltage on primary winding
KV(Rms)
13.
1.2/50 micro second impulse wave withstand test voltage KV(Peak)
14. One minute power frequency withstands test voltage on secondary winding
KV(Rms)
15. Bushing creepage distance (mm)
16. Variation in ration and phase angle error for variation in:
a) Voltage by 1%
b) Frequency by 1 Cycle
16. Whether corona shield is provided or not
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 61/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
11/16 Technical specification, Volume-II
Section –V (33KV VT)
17. (a )Weight of oil filling. Kg.
(b) Total weight. Kg.
(c) Overall dimension. mm
(d) Mounting detail
(e) Shipping dimension of largest package Kg
18. Enclose copies of test reports etc.
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 62/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
12/16 Technical specification, Volume-II
Section –V (33KV VT)
SCHEDULE - II
SCHEDULE OF DEVIATION BY THE TENDERER
1. General condition of contract.
Sl.
No
.
Specification Clause Deviation by the tenderer Justification
by the
tenderer
`1 2 3 4
2. Technical specification of contract.
Sl.No. Specification Clause
No.
Details of deviation Justification for
deviation.
-----------------------------------------------------------------------------
CERTIFICATE :The tenderer hereby certify that the above mentioned are the only deviation
from the purchaser specification.
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 63/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
13/16 Technical specification, Volume-II
Section –V (33KV VT)
SCHEDULE - III
SCHEDULE OF SPARE PARTS AND TOOLS
Sl.No. Description of spare parts Qty. Rate Amount
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 64/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
14/16 Technical specification, Volume-II
Section –V (33KV VT)
SCHEDULE - IV
SCHEDULE OF INSTALLATION
Sl.No. Name & brief description of
installation
Customer Year of supply
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 65/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
15/16 Technical specification, Volume-II
Section –V (33KV VT)
SCHEDULE-V
SCHEDULE OF PRICES
(to be filled in by Tenderer)
Note : In addition to filling up this Schedule, the Tenderer shall attach separately a detailedlist of materials he is supplying.
S l . N o .
Description U n i t
Q u a n t i t y
E x - W o r k
R a t e ( P )
E x c i s e D u t y
( P )
T a x
( P )
F r e i g h t
&
I n s u r a n c e
( P )
U n i t R a t e
F O R
D e s t i n a t i o n
( P )
T o t a l
A m o u n t ( P )
( i )(ii) ( i i i )
( i v )
(v) (vi) (vii) (viii)
(ix)=(v)+
(vi)+(vii)+
(viii) ( x
) = ( i v )
x ( i x )
1 Single phase 33000V/√3: 110V/√3 – 110V/√3voltage transformer
complete with protection
fuses, terminal boxes,
junction boxes and
terminal connectors as
detailed in ‘Schedule of Requirements’
N o s .
2 Mounting steel structures S e t 4 Tools, spanners and
other plants and
equipments for erection S e t
5 Itemised prices and
quantities of
recommended spare
parts for satisfactory
operation of the
equipment for 5 years.
S e t
6 Erection and
commissioning charges
for the above
equipments.
7 Number of supervisory
personnel recommended
for satisfactory
supervision of erection
and commissioning incase only the supervision
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 66/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
16/16 Technical specification, Volume-II
Section –V (33KV VT)
of erection,
commissioning is
entrusted to the
contractor, along with
the daily charges for the
services of eachsupervisory staff.
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 67/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
1/15 Technical specification, Volume-II
Section –VI (132KV CT)
TECHNICAL SPECIFICATION OF 132KV CURRENT TRANSFORMERS
1. SCOPE:
This specification covers the design, manufacture and assembly, testing atmanufacturer’s works site, supply& delivery at site of outdoor and indoor current
transformer required for metering and current protection including differential
protection of transformer/distance protection of lines.
2. CLIMATIC CONDITION AT SITE:
The climatic conditions at site under which the current transformer shall operate are
as follows:
Maximum ambient temperature : 40° C
Minimum ambient temperature : - 5° C
Relative humidity : 62% to 89%
Average annual rainfall. : 2280 mm
No of months of tropical monsoon : 6 months (May to October)
Seismic Zone : V
Maximum altitude : Above 1000m above sea level.
3. STANDARDS:
The items shall conform in all respects to the following relevant standards/regulations
with latest amendments thereof:
Sl. No. Relevant Standards Title
1.0 IS 2705 (Part I to IV) Current transformers
2.0 IS 4201 Application guide for current transformers.
3.0 IS 2099 High voltage porcelain bushings4.0 IS 11322 Partial discharge measurement in instrument
transformer
5.0 IS 2071 Methods of high voltage testing
6.0 IS 335 Insulating oil
7.0 IS 13947 (Part I),
IS 12063
Degree of protection provided by enclosures for
low voltage switchgear and control
8.0 IEC 60044 - 1 Current transformers
9.0 IS 5561 Electric power connections – terminal
connectors
10.0 IS 4759 Hot dip zinc coatings on structural steel and
other allied products
11.0 IS 2633 Methods of testing weight, thickness and
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 68/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
2/15 Technical specification, Volume-II
Section –VI (132KV CT)
uniformity of coating on hot dipped galvanised
articles
12.0 IS 13134/IEC 60815 Guide for selection of insulators in respect of
polluted conditions
Items matching with requirements of other national or international standards whichensure equal or better performance than the standards mentioned above may also be
considered. When the items offered by the supplier conforms to standards other than
those specified above, salient points of difference between the standards adopted and
standards specified in this specification shall be clearly brought out and a copy of
such standards shall invariably be furnished along with the offer.
4. TYPE AND RATING:
1. The current transformers shall be outdoor type, single phase, oil immersed,
self cooled and suitable for operation under the climatic conditions obtaining at site.
2. The current transformers shall have the following ratings:-
i) Nominal system voltage. 132 KV
ii) Highest system voltage. 145 KV
iii) No. of phases in the system. Three
iv) Earthing of system. Effectively earthed
v) Frequency 50 Hz ± 5%
vi) Rated short time thermal current 31.5kA for 1 sec
vii) Insulation level
a) 1.2/50 micro second lightning impulse
withstand voltage 650KVp
b ) 1 minute power frequency withstand
voltage 275KVrms
viii) Minimum creepage distance 3625 mm
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 69/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
3/15 Technical specification, Volume-II
Section –VI (132KV CT)
3. The current transformers of different ratings shall have the following
characteristics.
Sl.
No.
Rated
transformation
ratio/core
Accuracy
class at
all ratios
Rated
Burden
at allratios
Accuracy limit
factor/instrument
security factor atall ratios
Knee point
voltage at
all ratios Purpose.
1.0 600-400
/1/1/1A
Core-I 0.2s 30 VA ISF ≤ 3.5 - Metering
Core-II 5P 30 VA ALF : 10 -O/C & E/F
protection.
Core-III PS - - 70R CT + 600Distance
protection
4. The characteristics of the core classified as PS of the above CT are based oncertain protections assumed and expected to hold good. In case need arises to co-
ordinate any of these characteristics, especially the knee point voltage of the core in
the light of control and relay equipment to be finalized, the tenderer shall keep this
point in view while submitting his offer.
5. TEMPERATURE RISE:
Current transformers shall be capable of carrying their rated primary and secondary
current continuously without any temperature rise exceeding the limits as laid down in
the approved standard to which they are designed and corrected to the difference in
ambient temperature at site and that given in the standard. They shall withstand thethermal, electrical and mechanical stresses caused by specified symmetrical RMS
breaking current for one second corresponding to a rupturing capacity of 31.5kA for
132 KV circuit breakers.
6. DESIGN FEATURES:
01. GENERAL:
The current transformers shall be single phase, oil immersed and self cooled
type, suitable for the services indicated and conforming to the best modern
practice of design and manufacture. The design of current transformers shall
be such that its accuracy shall not be affected by the presence of pollution on
the external surface of its insulators.
The locations for installation of current transformers are situated in seismic
zone - V. The design and construction shall be such as to provide necessary
protection against the earthquake forces. Dampers and/or additional
supporting structures may be provided with the voltage transformers, if
necessary, to cater for their operation in the seismic zone.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 70/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
4/15 Technical specification, Volume-II
Section –VI (132KV CT)
02. CORES:
The cores for the current transformers shall be of high grade non-ageing
electrical silicon laminated steel of low hysteresis loss and high permeability
to ensure high accuracy at both normal and over current.
The cores to be used for metering and indicating instruments shall have a
saturation factor low enough not to cause any damage to meters and
instruments in the event of maximum short circuit currents.
The cores to be used for distance protection and differential protection shall
have a high saturation factor. Magnetisation characteristics curves of these
cores shall be furnished along with the bid.
03. WINDINGS:
Primary winding consisting of suitable number and size of conductors shall beinsulated with special paper having high mechanical strength, high electrical
withstand properties and good ageing qualities. The primary winding shall be
of suitably insulated electrolytic copper wire.
The rating of the secondary windings shall be one Ampere. The secondary
terminal shall be brought out in a compartment for easy access. The secondary
terminals shall be provided with shorting arrangements. The secondary taps
shall be adequately reinforced to withstand the normal handling without
damage. Suitably insulated copper wire of electrolytic grade shall be used for
secondary windings.
04. TANK:
Each current transformer shall be of Live Tank type to be supplied filled with
insulating oil and shall be hermetically sealed to prevent atmosphere from
coming into contact with oil, avoid filtration and change of oil. In case, the
tenderer intends to use nitrogen or any other inert gas above the oil level as to
permit expansion and contraction of oil, the same shall be stated in the tender.
Both expansion chamber and tank of the current transformer shall be made of
high quality steel and shall be able to withstand full vacuum and pressureoccurring during transit, and thermal and mechanical stresses resulting from
maximum short circuit current during operation.
All interiors or exteriors of tanks, secondary box and other metal parts shall be
thoroughly cleaned to remove all rust, scales, corrosion, grease or other
adhering foreign matters. All steel surfaces in contact with insulating oil as far
as accessible shall be painted with not less than two coats of heat resistant oil
insulating varnish. Steel surface exposed to atmosphere if not hot dip
galvanised shall be given a priming coat of zinc chromate and two coats of
light grey rust preventing paint. Other ferrous parts shall be hot-dip galvanised
as per relevant standard.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 71/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
5/15 Technical specification, Volume-II
Section –VI (132KV CT)
The metal tank shall have bare minimum number of welded joints so as to
minimize possible locations of oil leakage.
Metal tank of the current transformer shall be provided with two separate
earthing terminals for bolted connection to 50 x 6 mm m.s. flat to be provided
by the purchaser for connection to the station earth mat. The earthingterminals shall be provided complete with adequate size washers, nuts and
bolts.
The current transformer shall be provided with suitable lifting arrangement for
lifting of the entire unit. The lifting arrangement (lifting eye) shall be
positioned such that the porcelain bushings and tank shall not be damaged
during lifting for transportation/installation.
05. TERMINAL CONNECTORS:
Appropriate number of terminal connectors suitable for ACSR Zebra /Panther conductor shall be supplied. Suitable terminal connectors for earth connections
shall also be supplied.
06. BUSHINGS:
The bushing and terminal insulator, where provided for the current
transformer shall conform to the latest edition of IS: 2099. The bushings shall
be made of homogeneous, vitreous porcelain of high mechanical and dielectric
strength. Glazing of porcelain shall be of uniform brown or dark brown colour
with smooth surface, arranged to shed away rain water or condensed water
particles.
The bushings shall have ample insulation, mechanical strength and rigidity for
the conditions under which they will be used and shall be designed to prevent
accumulation of explosive gases and to provide adequate oil circulation to
remove internal heat. There shall be no undue stressing of any part of the
bushings due to temperature changes and adequate means shall be provided to
accommodate conductor expansion.
The bushings shall be so designed that when operating at the specified highest
system voltage there will be no electric discharge between the conductors and bushings. No corrosion or injury would be cause to conductor, insulation or
supports by the formation of substances produced by chemical action. The
insulation of bushing shall be coordinated with that of the current transformer
such that flash-over will occur only externally to the current transformers. The
bushing should not cause radio disturbances when operated at rated voltage.
07. TERMINAL BOX AND JUNCTION BOX:
All secondary terminals shall be brought out in a weatherproof terminal box
on one side of each current transformer. The exterior of this terminal box shall
be hot dip galvanised. A terminal board for short circuiting of secondaryterminals shall be provided.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 72/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
6/15 Technical specification, Volume-II
Section –VI (132KV CT)
Cable box alongwith necessary glands for receiving control cables suitable for
mounting on the bottom plate of the terminal box shall be included in the
scope of supply.
A door with locking arrangements shall be provided in the front of the
terminal box so as to permit easy access to the secondary terminals. The door shall have suitable arrangement to check ingress of moisture into the terminal
box.
All terminals shall be clearly marked with identification number to facilitate
connection to external wiring.
Polarity shall be indelibly marked on each primary and secondary terminal.
In addition to terminal box on each current transformer, tenderer shall also
supply a common junction box for each set of three current transformers of
each circuit. The junction box shall be weather proof type suitable for mounting on the steel structure.
The terminal boxes and junction boxes shall be suitable for outdoor
installation and shall conform to IP55 protection class.
08. OIL LEVEL GAUGE:
An oil level gauge shall be provided in indicate the oil level in the current
transformer. The oil gauge shall be mounted in such a way that the oil level
can be seen from the ground level.
09. PRESSURE RELIEVING DEVICES:
Each current transformer shall be provided with a pressure relieving device so
as to prevent bursting of current transformer even under unfavourable
conditions.
10. OIL DRAIN COCK:
An oil drain cock alongwith a stop cock shall be provided in the bottom
flange so as to permit taking of oil samples for testing.
11. OIL FILLING COCK:
An oil filling cock along with a stop cock shall be provided for filling the oil
in the current transformer.
7. MOUNTING STRUCTURES:
The current transformers shall be mounted on steel structures, at a height of 2.5m
from ground level. The tenderer shall ensure that the CTs supplied can be mounted on
the existing steel (galvanized) structures. Necessary connecting materials, such as
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 73/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
7/15 Technical specification, Volume-II
Section –VI (132KV CT)
clamps, bolts, nuts, washers, etc. as well as foundation bolts for the supporting
structures shall be supplied by the tenderer.
8. RATING PLATE:
Each current transformer shall be provided with a non-corrosive rating plate inaccordance with latest edition of IS: 2705 Part-I. Following additional particulars
shall also be marked on the rating plate of each current transformer.
a) Purpose (measurement or protection), rated output at 0.9 PF lagging, rated
accuracy factor and rated class of accuracy of each secondary winding in
terms of IS: 2705.
b) Terminal numbering of each secondary winding.
c) Knee point voltage.
d) Maximum exciting current at knee point voltage.
e) Secondary winding resistance at 75°C.
f) Rated instrument security factor in respect of winding meant for measurement
and metering.
9. INSULATING OIL:
The quantity of oil for first filling of each CT and the complete specifications of oil
proposed to be used shall be stated. It would be desirable to use oil conforming to the
provisions of latest IS: 335.
10. TESTS:
ROUTINE TESTS:
Each current transformer shall be subjected to routine tests as specified in the latest
edition of IS: 2705 (Part I to IV). If the purchaser wishes to have a representative,
tests shall be performed in his presence so as to be witnessed by him.
The routine tests shall consist of the following:
(a) Verification of terminal markings and polarity
(b) Power frequency dry withstand tests on primary winding
(c) Power frequency dry withstand test on secondary windings
(d) Over voltage inter-turn test
(e) Partial discharge tests
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 74/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
8/15 Technical specification, Volume-II
Section –VI (132KV CT)
(f) Determination of errors or other characteristics according to the
requirements of the appropriate designation or accuracy class as per
individual parts of IS: 2705.
(g) Knee-point voltage and exciting current for PS Class cores
(h) Secondary winding resistance for PS Class cores
(i) Turns ratio for PS Class cores
TYPE TESTS:
The bidder shall furnish four sets of all the type test reports from CPRI or other
accredited laboratories along with the offer. The type tests must have been conducted
less than five years from the date of opening of bid. The Purchaser reserves the right
to repeat the type tests in the presence of a representative at the cost of the Supplier.
The type tests shall be in accordance with the latest edition of IS: 2705 (Part I to IV),
and shall consist of the following:
(a) Short-time current test
(b) High voltage power frequency wet withstand test
(c) Determination of errors or other characteristics according to the
requirements of the appropriate designation or accuracy class as per
individual parts of IS: 2705.
(d) Temperature rise test
(e) Lightning impulse voltage test
(f) Degree of protection tests of secondary terminal, junction box
All the test reports shall be submitted and got approved by the purchaser, before
despatch of the equipment.
SPECIAL TESTS:
The special tests shall consist of the following:
a. Chopped lightning impulse test as a type test
b. Measurement of dielectric dissipation factor for oil immersed current
transformers
c. Mechanical test
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 75/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
9/15 Technical specification, Volume-II
Section –VI (132KV CT)
11. DRAWINGS AND INSTRUCTION MANUALS:
The tenderer shall submit, with the tender, all the drawings enumerated in this
specification to enable to purchaser to assess the suitability of equipments.
As soon as possible after the award of the contract, the manufacturer shall supply sixcopies of the following drawings which shall describe the equipment in full details for
approval and shall subsequently provide eight complete sets of final approved
drawings, one of which shall be autopositive/soft copy suitable for reproduction.
i. Outline dimensional drawings.
ii. Assembly Drawings.
iii. Cross sectional view of the current transformer.
iv. Drawings giving details of supporting structures and foundation.
v. Drawing showing the details of terminal connectors.
vi. Magnetising curves.
vii. Wiring diagram with polarity mark.
In addition to the above drawings, the tenderer may supply any other drawing, which
in his opinion is required to describe the equipment in full details.
After the completion of the erection work, the contractor shall furnish seven sets
(including one reproducible on soft copy) of the completion drawings. Six copies of
instruction manuals covering instruction for installation and maintenance check tests
shall be supplied by the contractor as a part of this contract.
12. SPARE PARTS:
A list of spare parts recommended for five years operation for the current
transformers shall be furnished with the tender. The purchaser shall decide the actual
quantity of spare parts to be ordered on the basis of the list and the item-wised prices
of spare parts called for in Schedule-V.
13. COMPLETENESS OF EQUIPMENT:
The tenderer shall be complete in all respect and include all accessories which may
not be specifically mentioned in this specification but which are essential for the
completeness of equipment ordered.
14. DEVIATIONS FROM SPECIFICATIONS:
All deviations from the specification shall be separately listed as per proforma given
in Schedule-III, in the absence of which it shall be presumed that the provisions of thespecification are complied with by the tenderer.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 76/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
10/15 Technical specification, Volume-II
Section –VI (132KV CT)
15. ERECTION AND SUPERVISION:
The purchaser may at his discretion ask the tenderer to do either the complete erection
or supervision of erection at site of the equipment covered by this specification. The
tenderer shall, therefore, quote their charges separately for (i) erection and (ii) rates
for supervision of erection.
However, if it is decided to do the erection of the above equipment departmentally,
the tenderer shall furnish full and detailed instructions complete with drawings and
leaflets to enable the satisfactory erection and commissioning of the equipment by the
purchaser. Such instructions shall reach the purchaser well in advance so that there is
no delay in commencement of erection. The successful tenderer shall supply all
special tools necessary for erection. Details of such tools and the price thereof shall be
stated in the tender separately.
16. GUARANTEED TECHNICAL PARTICULARS:
Guaranteed technical particulars as called for in Schedule-I shall be furnished
alongwith the tender. Any tender lacking the complete information in this respect is
likely to be rejected. Particulars which are not subject to guarantee shall be clearly
marked.
17. SCHEDULE OF INSTALLATION:
Tenderer shall furnish a list of similar equipment supplied by him and presently in
service as per proforma given in Schedule-IV.
18. PACKING & FORWARDING:
The equipment shall be packed in suitable crates so as to withstand handling during
transport and outdoor storage. The supplier must be responsible for any damage to the
equipment during transit due, to improper and inadequate packing. Any material
found short/damaged shall be replaced by the supplier at no extra cost to the
purchaser.
19. SCHEDULE OF REQUIREMENTS:
1. 132 KV single phase, outdoor type current transformers as specified in thespecification above and rating details as per Clause 4.3 and as mentioned below:
Sl. No. Rated transformation
ratio/coreQuantity
1.0 600-400 /1/1/1A 36 Nos
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 77/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
11/15 Technical specification, Volume-II
Section –VI (132KV CT)
SCHEDULE-I
GUARANTEED TECHNICAL PARTICULARS
(The Tenderer shall furnish separate GTPs for different CT ratings)
1. Manufacturer’s name and country of origin:
2. Manufacturer’s type, designation and model:
3. Current transformers data: Core-I Core-II Core-III Core-IV
a. Rated primary current (A):
b. Rated secondary current (A):
c. Transformation ratio:
d. Rated output at 0.9
lagging PF (VA):
e. Class of accuracy:
f. Accuracy limit factor:
g. Knee point voltage (V):
h. Excitation current at
knee point voltage (mA):
i. Secondary limiting voltage:
j. Resistance of secondary winding
at 75°C (Ω):
4. Nominal rated voltage (KV):
5. Maximum voltage of operation (KV):
6. One second over-current factor
(times rated current):
7. Short time thermal rating for:
a) One second. kA (rms):
b) Three seconds kA (rms):
8. Rated dynamic current (Peak value):
9. Instrument security factor for the windingmeant for measurement and metering:
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 78/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
12/15 Technical specification, Volume-II
Section –VI (132KV CT)
10. Rated continuous thermal current
and corresponding temperature rise (kA°C):
11. Creepage distance (mm):
12. One minute power frequency dry
withstand test voltage - KV(rms):
13. One minute power frequency wet
withstand test voltage - KV(rms):
14. 1.2/50 micro second full wave
impulse withstand test voltage - KV(Peak):
15 Weight of oil per CT (Kg):
16 Class of oil:
17 Whether pressure relief device
provided (Yes/No):
18 Total weight per C.T. (Kg):
19 Magnetisation curves of C.T.cores
supplied with tender and total
drawing Nos. attached:
20 Overall dimensions (mm x mm x mm):
21 Mounting details:
22 Shipping dimensions of largest package
(mm x mm x mm):
23 Shipping weight of heaviest package (Kg):
24
Enclosed copies of test reports etc:
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 79/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
13/15 Technical specification, Volume-II
Section –VI (132KV CT)
SCHEDULE-II
SCHEDULE OF PRICES
(to be filled in by Tenderer)
Note : In addition to filling up this Schedule, the Tenderer shall attach separately a detailedlist of materials he is supplying.
S l . N o .
Description U n i t
Q u a n t i t y
E x - W o r k
R a t e ( P )
E x c i s e D u t y
( P )
T a x
( P )
F r e i g h t
&
I n s u r a n c e
( P )
U n i t R a t e
F O R
D e s t i n a t i o n
( P )
T o t a l
A m o u n t ( P )
( i ) (ii) ( i i i ) ( i v )
(v) (vi) (vii) (viii)
(ix)=(v)+
(vi)+(vii)+
(viii) ( x
) = ( i v )
x ( i x )
1 132KV single phase,
outdoor, oil filled current
transformer complete
with terminal boxes,
junction boxes and
terminal connectors as
detailed in ‘Schedule of
Requirements’
a 600-400 /1/1/1A
N
o s
33
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 80/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
14/15 Technical specification, Volume-II
Section –VI (132KV CT)
SCHEDULE-III
SCHEDULE OF DEVIATION FROM SPECIFICATION
Sl. No. Specification Clause No. Details of deviation Justification for
deviation.
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 81/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
15/15 Technical specification, Volume-II
Section –VI (132KV CT)
SCHEDULE-V
SCHEDULE OF SPARE PARTS AND TOOLS
Sl.
No.
Description of Spare Parts Quantity Rate Amount
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 82/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
1/14 Technical specification, Volume-II
Section –VII (132KV VT)
SPECIFICATION FOR 132KV VOLTAGE TRANSFORMER
1. SCOPE:
This specification covers the design, manufacture, assembly, testing at manufacturer’sworks, supply, delivery at site, of outdoor voltage transformers required for 132 KV
Sub-Stations and Generating Stations.
2. CLIMATIC CONDITION :
The climatic conditions at site under which the voltage transformer shall operate are
as follows:
Maximum ambient temperature : 40° C
Minimum ambient temperature : - 5° C
Relative humidity : 62% to 89%
Average annual rainfall. : 2280 mm
No of months of tropical monsoon : 5 months (May to October)
Seismic Zone : V
Maximum altitude : Above 1000m above sea level.
3. STANDARDS:
The items shall conform in all respects to the following relevant standards/regulations
with latest amendments thereof:
Sl. No. Relevant Standards Title
1.0 IS 3156 (Part I to III) Voltage transformers
2.0 IS 4146 Application guide for voltage transformers.
3.0 IS 2099 High voltage porcelain bushings
4.0 IS 11322 Partial discharge measurement in instrumenttransformer
5.0 IS 2071 Methods of high voltage testing
6.0 IS 335 Insulating oil
7.0 IS 13947 (Part I),
IS 12063
Degree of protection provided by enclosures for
low voltage switchgear and control
8.0 IEC 60044 - 2 Voltage transformers
9.0 IS 5561 Electric power connections – terminal
connectors
10.0 IS 4759 Hot dip zinc coatings on structural steel and
other allied products
11.0 IS 2633 Methods of testing weight, thickness and
uniformity of coating on hot dipped galvanised
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 83/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
2/14 Technical specification, Volume-II
Section –VII (132KV VT)
articles
12.0 IS 13134 Guide for selection of insulators in respect of
polluted conditions
Items matching with requirements of other national or international standards which
ensure equal or better performance than the standards mentioned above may also beconsidered. When the items offered by the supplier conforms to standards other than
those specified above, salient points of difference between the standards adopted and
standards specified in this specification shall be clearly brought out and a copy of
such standards shall invariably be furnished along with the offer.
4. TYPE AND RATING:
a. The voltage transformer shall be single phase, oil immersed, self cooled, core
type suitable for outdoor operation, effectively earthed under the climatic condition as
given in this specification.
b. The voltage transformers shall have the following ratings:
i) Normal system voltage : 132 KV
ii) Highest system voltage : 145 KV
iii) Frequency : 50 Hz ± 5%
iv) System of earthing : Effectively earthed
v) Ratio : 132/√3 KV: 110/√3V- 110V/√3
vi) No. of secondary windings : Two
vii) Rated burden:
(a) Winding I : 200VA
(b) Winding II : 100VA
viii) Class of accuracy:
(a) Winding I : 0.2 as per IS 11448
(b) Winding II : 3P as per IS 11448/IEC60044-2
ix) Power frequency withstand voltage
for one minute : 275 KV
x) Lightning impulse withstand voltage : 650 KV
xi) Fault level : 25.0kA
xii) Rated short circuit withstand capability : 31.5kA for 1 sec
xiii) Class of insulation : A
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 84/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
3/14 Technical specification, Volume-II
Section –VII (132KV VT)
xiv) Rated voltage factor : 1.2 – continuous,
1.5 for 30 seconds
5. DESIGN AND CONSTRUCTION:
The voltage transformers shall be complete in all respects conforming to the modern
practice for design and manufacture. The design of voltage transformers shall be such
that its accuracy shall not be affected by the presence of pollution on the external
surface of its insulators.
The locations for installation of voltage transformers are situated in seismic zone - V.
The design and construction shall be such as to provide necessary protection against
the earthquake forces. Dampers and/or additional supporting structures may be
provided with the voltage transformers, if necessary, to cater for their operation in the
seismic zone.
a. CORES:
The core shall be of high grade non-ageing, electrical silicon laminated steel
of low hysteresis and eddy current losses and high permeability to ensure high
accuracy at both normal and over voltages.
b. WINDINGS:
Primary windings: The primary winding of the voltage transformer shall be
connected in phase to neutral with the neutral point solidly earthed. The
neutral of the system is also solidly earthed. The primary winding shall be of
suitably insulated electrolytic copper wire.
Secondary windings: The voltage transformer shall be provided with two
separate secondary windings rated for 110V/√3 and 110V/√3. Suitably
insulated copper wire of electrolytic grade shall be used for secondary
windings.
c. TANK:
Each voltage transformer shall be supplied filled with insulating oil and shall be hermetically sealed to prevent atmosphere from coming into contact with
oil, avoid filtration and change of oil.
The tank shall be fitted with oil gauge and provisions for convenient filling
and draining of oil. The oil gauge shall be mounted in such a way that the oil
level can be seen from the ground level.
Both expansion chamber and tank of the voltage transformer shall be made of
high quality steel and shall be able to withstand full vacuum and pressure
occurring during transit, and thermal and mechanical stresses resulting from
maximum short circuit current during operation.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 85/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
4/14 Technical specification, Volume-II
Section –VII (132KV VT)
The tank shall be given three coats of rust preventing paint. Other ferrous parts
shall be hot-dip galvanised as per relevant standard.
The metal tank shall have bare minimum number of welded joints so as to
minimize possible locations of oil leakage.
Metal tank of the voltage transformer shall be provided with two separate
earthing terminals for bolted connection to 50 x 8 mm m.s. flat to be provided
by the purchaser for connection to the station earth mat. The earthing
terminals shall be provided complete with adequate size washers, nuts and
bolts.
The voltage transformer shall be provided with suitable lifting arrangement for
lifting of the entire unit. The lifting arrangement (lifting eye) shall be
positioned such that the porcelain bushings and tank shall not be damaged
during lifting for transportation/installation.
The voltage transformer shall be constructed such that it can be easily transported to
site within the allowable transport limitation and in horizontal position, if the
transport limitations so demand.
6. BUSHING:
a. Oil filled condenser type porcelain bushings shall be used on the voltage
transformers. The porcelain shall be homogenous, thoroughly vitrified, tough
and impervious to moisture. The glazing of porcelain shall be of uniform
brown colour, free from blisters, burns and other similar defects. The bushings
shall have ample insulation, mechanical strength and rigidity for the
conditions under which they will be used and shall be designed to prevent
accumulation of explosive gases and to provide adequate oil circulation to
remove internal heat. There shall be no undue stressing of any part of the
bushings due to temperature changes and adequate means shall be provided to
accommodate conductor expansion.
b. The bushings shall be so designed that when operating at the specified highest
system voltage there will be no electric discharge between the conductors and
bushings. No corrosion or injury would be cause to conductor, insulation or
supports by the formation of substances produced by chemical action. Theinsulation of bushing shall be coordinated with that of the voltage transformer
such that flash-over will occur only externally to the voltage transformers. The
bushing should not cause radio disturbances when operated at rated voltage.
c. In general the bushings shall conform to the latest issue of IS: 2099 or
equivalent.
d. Each of the bushings shall be complete with the following fittings.
i. Bimetallic expansion type terminal connector complete with washers
bolts/nuts.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 86/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
5/14 Technical specification, Volume-II
Section –VII (132KV VT)
ii. Oil level sight gauge and convenient means of filling, sampling and
drawing of oil.
iii. End shield for even distribution of stresses.
iv. Corona shields for bushing, if required.
7. TEMPERATURE RISE:
Voltage transformers shall be capable of carrying their rated burden continuously at
rated voltage and frequency without the temperature rise exceeding the limits laid
down in the approved standard, to which they are designed and corrected to difference
in ambient temperature at site and that given in the standard. The temperature rise at
1.2 times rated primary voltage when applied continuously at rated frequency and at
rated burden shall not exceed the limits specified in the standard and the temperature
rise at 1.5 times rated primary voltage when applied for 30 seconds starting from
previous stable operation condition at rated frequency and rated burden shall not
exceed the temperature limits by more than 10°C.
8. PRESSURE RELIEVING DEVICE:
Each voltage transformer shall be provided with a pressure relieving device capable of
releasing abnormal internal pressure.
9. INSULATING OIL:
The quantity of the insulating oil for first filling of each voltage transformer and the
complete specifications of oil proposed to be used shall be stated. The oil preferably
conforms to the requirement of latest IS: 335 or equivalent IEC standard.
10. MOUNTING STRUCTURES:
The voltage transformers shall be mounted on steel structures. The tenderer shall
quote separately for the supporting structures of 2.5m high each. Necessary
connecting materials, such as clamps, bolts, nuts, washers, etc. and foundation bolts
for mounting the equipment on the supporting structures shall be galvanised and shall
be supplied by the tenderer.
11.
TERMINAL CONNECTORS:
Terminal connectors suitable for ACSR Zebra conductors shall be supplied. Suitable
terminal connectors for earthing connections shall also be supplied.
12. TERMINAL BOX AND JUNCTION BOX:
Each voltage transformer shall be provided with one or more terminal boxes suitably
located to house the terminals of the two secondary windings. The terminal box shall
be outdoor type, vermint proof and shall be provided with a door in front so as to have
easy access to the secondary terminals. The door shall have a sealing/locking
arrangement and shall be suitable to prevent penetration of moisture and rain water.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 87/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
6/14 Technical specification, Volume-II
Section –VII (132KV VT)
The terminal box shall be provided with removable gland plate and glands suitable for
1100 volts grade PVC insulated, PVC sheathed multi-core 2.5 sq. mm. to 10 sq. mm.
stranded copper conductor cable.
The terminal box, with the cover closed and tightened and the cable/conduit in
position when supplied shall have degree of protection not less than IP55 conformingto latest issue of IS: 13947 (Part I).
Polarity shall be indelibly marked at the secondary terminals in the terminal box.
In addition to terminal box on each voltage transformer, tenderer shall also supply a
common junction box for each set of three voltage transformers of each circuit. The
junction box shall be weather proof type suitable for mounting on the steel structure.
Sufficient number of terminals shall be provided in the junction box for connecting
the leads from individual voltage transformer and formation of star or delta as
required and to relay metering in the control room.
13. MARKING:
i) RATING PLATE:
Each voltage transformer shall be provided with a non-corrosive and non-rusting
name and rating plate as per latest issue of IS: 3156 (Part-I). The plates shall have
information such as rated output, accuracy, terminal numbering of secondary
windings, as well, as the following indelibly marked on it.
a) Manufacturer’s name and country of origin. b) Manufacturer’s serial number. c) Rated transformer ratio.
d) Rated frequency.
e) Rated output per phase and accuracy class.
f) Number of phase and method of connection.
g) Type of transformer
h) Highest system voltage
i) Insulation level.
ii) TERMINAL MARKING:
The terminal marking shall identify -
a) The primary & secondary winding.
b) The winding section if any.
c) The relative polarities of windings.
iii) METHOD OF MARKING:
a) The terminals shall be marked clearly and indelibly either on the surface or
in their immediate vicinity.
b) The marking shall consist of letter followed by numbers.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 88/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
7/14 Technical specification, Volume-II
Section –VII (132KV VT)
14. TESTS:
ROUTINE TESTS:
Each voltage transformer shall be subjected to routine tests as specified in the latest
edition of IS: 3156 (Part I to III). If the purchaser wishes to have a representative,tests shall be performed in his presence so as to be witnessed by him.
The routine tests shall consist of the following:
(a) Verification of terminal markings and polarity
(b) Power frequency tests on primary winding
(c) Power frequency test on secondary windings
(d) Determination of errors
(e) Oil leakage test
TYPE TESTS:
The bidder shall furnish four sets of all the type test reports along with the offer. The
type tests must have been conducted less than five years from the date of opening of
bid. The Purchaser reserves the right to repeat the type tests in the presence of a
representative at the cost of the Supplier.
The type tests shall consist of the following:
(a) Verification of terminal markings and polarity
(b) Power frequency tests on primary winding
(c) Power frequency test on secondary windings
(d) Determination of errors
(e) Temperature rise test
(f) Impulse voltage test
(g) Degree of protection of secondary terminal box
(h) Partial discharge measurement
15. DRAWING AND INSTRUCTION MANUAL:
The tenderer shall submit with the tender all the drawings to enable the purchaser to
assess the suitability of the equipment.
As soon as possible after the award of the contract, the manufacturer shall supply six
copies of following drawings which shall describe the equipment in full detail for
approval, and shall subsequently provide eight complete sets of final approved
drawings, one of which shall be auto positive/soft copy suitable for reproduction.
a) Outline dimensional drawings.
b) Assembly drawings.
c) Cross sectional view of the voltage transformer.
d) Foundation drawings.
e) Drawings showing the details of terminal connectors.
f) Magnetising curves.g) Wiring diagram with polarity mark.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 89/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
8/14 Technical specification, Volume-II
Section –VII (132KV VT)
In addition to the above drawings, the tenderer may supply any other drawing, which
in his opinion is necessary to describe the equipment in full detail.
After the completion of the erection work, the contractor shall furnish seven sets
(including one soft copy) of the completed drawings.
Six copies of the instruction manual covering instruction for installation and
maintenance check tests shall be supplied by the contractor as part of this contract..
16. SPARE PARTS:
A list of the spare parts recommended for five years operation of the PT shall be
furnished with the tender. The purchaser shall decide the actual quantity of spare parts
to be ordered on the basis of the list and the item wised prices of spare parts called for
in Schedule - III.
17. COMPLETENESS OF THE EQUIPMENT:-
The tenderer shall be complete in all respect and include all accessories which may
not be specifically mentioned in this specification but which are essential for the
completeness of the equipment ordered.
18. DEVIATION FROM SPECIFICATION:-
All deviations from the specification shall be separately listed as per proforma given
at Schedule - II, in absence of which it shall be presumed that the provisions of the
specification are complied with by the tenderer.
19. GUARANTEED & TECHNICAL PARTICULARS:-
Guaranteed technical particulars as called for in schedule-I shall be furnished along
with the tender. Any tender lacking complete information in this respect is likely to be
rejected. Particulars which are subject to guarantee shall be clearly marked.
20. SCHEDULE OF INSTALLATION:-
Tenderer shall furnish a list of similar equipment supplied by him and presently inservice as per proforma given in schedule - IV.
21. SCHEDULE OF REQUIREMENT:-
Sl No. Rated transformation ratio/core Quantity
1
Single phase 132000V/√3: 110V/√3 - 110V/√3voltage transformer complete with protection fuses,
terminal boxes and terminal connectors as detailed
in specification.
24
2Junction box with sufficient numbers of terminals
as detail in specification
3 Spares as recommended for satisfactory operation
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 90/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
9/14 Technical specification, Volume-II
Section –VII (132KV VT)
22. PACKING & FORWARDING:
The equipment shall be packed in suitable crates so as to withstand handling during
transport and outdoor storage. The supplier must be responsible for any damage to the
equipment during transit due, to improper and inadequate packing. Any material
found short/damaged shall be replaced by the supplier at no extra cost to the purchaser.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 91/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
10/14 Technical specification, Volume-II
Section –VII (132KV VT)
SCHEDULE-I
SCHEDULE OF GUARANTEED TECHNICAL PARTICULARS
1. Type
2. Manufacturers type designation.
3. Rated primary voltage. Volts.
4. Number of secondary winding
5. Rated secondary voltage Volts
Winding I
Winding II
6. Rated burden VA
Winding I
Winding II
7. Accuracy class
Winding I
Winding II
8. Temp rise at 1.2 times rated voltage and rated burden and frequency °C
9. Rated voltage factor at rated frequency, burden and time
10. Temperature rise for item 9 above. °C
11. One minute power frequency withstand test (dry) voltage on primary winding
KV(Rms)
12. One minute power frequency withstand test (wet) voltage on primary winding
KV(Rms)
13. 1.2/50 micro second impulse wave withstand test voltage KV(Peak)
14. One minute power frequency withstands test voltage on secondary winding
KV(Rms)
15. Bushing creepage distance (mm)
16. Variation in ration and phase angle error for variation in:
a) Voltage by 1%
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 92/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
11/14 Technical specification, Volume-II
Section –VII (132KV VT)
b) Frequency by 1 Cycle
16. Whether corona shield is provided or not
17. (a )Weight of oil filling. Kg.
(b) Total weight. Kg.
(c) Overall dimension. Mm
(d) Mounting detail
(e) Shipping dimension of largest package Kg
18. Enclose copies of test reports etc.
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 93/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
12/14 Technical specification, Volume-II
Section –VII (132KV VT)
SCHEDULE - II
SCHEDULE OF DEVIATION BY THE TENDERER
1. General condition of contract.
Sl.
No
.
Specification Clause Deviation by the tenderer Justification
by the
tenderer
`1 2 3 4
2. Technical specification of contract.
Sl.No. Specification Clause
No.
Details of deviation Justification for
deviation.
-----------------------------------------------------------------------------
CERTIFICATE :The tenderer hereby certify that the above mentioned are the only deviationfrom the purchaser specification.
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 94/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
13/14 Technical specification, Volume-II
Section –VII (132KV VT)
SCHEDULE - III
SCHEDULE OF SPARE PARTS AND TOOLS
Sl.No. Description of spare parts Qty. Rate Amount
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 95/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
14/14 Technical specification, Volume-II
Section –VII (132KV VT)
SCHEDULE-IV
SCHEDULE OF PRICES
(to be filled in by Tenderer)
Note : In addition to filling up this Schedule, the Tenderer shall attach separately a detailedlist of materials he is supplying.
S l . N o .
Description U n i t
Q u a n t i t y
E x - W o r k
R a t e ( P )
E x c i s e D u t y
( P )
T a x
( P )
F r e i g h t
&
I n s u r a n c e
( P )
U n i t R a t e
F O R
D e s t i n a t i o n
( P )
T o t a l
A m o u n t ( P )
( i )(ii) ( i i i )
( i v )
(v) (vi) (vii) (viii)
(ix)=(v)+
(vi)+(vii)+
(viii) ( x
) = ( i v )
x ( i x )
1 Single phase
132000V/√3 : 110V/√3 -
110V/√3 voltagetransformer complete
with protection fuses,
terminal boxes, junction
boxes and terminal
connectors as detailed in
‘Schedule of
Requirements’
N o s .
24
(Signature of Tenderer)
Name (In block letters)
Stamp.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 96/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
1/13 Technical specification, Volume-II
Section –VIII (METERS)
TECHNICAL SPECIFICATIONS FOR 0.2s ACCURACY CLASS AC STATIC
TRIVECTOR ENERGY METERS, SUITABLE FOR INTER UTILITY
METERING, BULK CONSUMER METERING, RING FENCING METERING
AND AVAILABILITY BASED TARIFF (ABT) METRING
1.0 SCOPE
This specification covers the design, engineering, manufacture, assembly, inspection and testing before
supply and delivery at site/ FOR destination of class 0.2s accuracy static HT tri-vector CT/ VT operated
meters, along with other associated equipments as per details given in this specification. The meters shall
be used for commercial/ tariff metering for inter utility power flows/ bulk consumers as well for
Availability Based Tariff (ABT) application.
The meter shall comply with Indian Companion Standard (ICS) of Category B for DLMS specification.
The Category B specifies the parameters to be used for Boundary/ Bank/ Ring Fencing/ ABT metering
along with other additional features. The meter records parameters under import and or export
conditions.
One static type composite meter shall be installed for each circuit, as a self-contained device for
measurement of power transmittals, as described herein, in each successive 15 minute block, and certain
other functions, detailed in the following paragraphs.
The metering system shall be housed in rack with draw out type feature capability for inserting the meter
module. Current terminal connection must be shorted when module is drawn out.
The meter shall have 1A/ 5A secondary current support with maximum current up to 200% of Ibasic.
Meter required with 3 phase 4 wire or 3 phase 3 wire connection type with corresponding secondary CT
value to be commissioned at each substation shall be informed to the successful bidders.
It is not the intent to specify completely herein all the details of the design and construction of material.
The material shall, however, conform in all respects to the best industry standards of engineering, design
and workmanship and shall be capable of performing for continuous commercial operation in a manner
acceptable to the purchaser The offered equipment shall be complete in all respects including all
components/ accessories for effective and trouble free operation according to the specifications. Such
components shall be deemed to be within the scope of this specification irrespective of whether those are
specifically brought out or not.
2.0 APPLICABLE STANDARDS
2.1 STANDARDS
The equipment shall conform (for testing, performance and accuracy) in all respects the relevant Indian/
International metering standards with latest amendments thereof unless otherwise specified.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 97/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
2/13 Technical specification, Volume-II
Section –VIII (METERS)
S. No. Standard No. Title
1 IEC 62053-22 AC Static meters for active energy, class 0.2s & 0.5s
2 IEC 62053-23 AC Static meters for reactive energy
3 CBIP technical report no. 304 Specification for AC static electricity energy meters
Immunity against magnetic interference up to 0.27T4 IS 14697-1999 AC static transformer operated Watt-hour and VAR-hour
meters for class 0.2s and 0.5s
5 IEC 60297 Dimensions of mechanical structures of 482.6 mm (19”)
series – Panels and Racks
6 BIS ICS DLMS companion
standard ETD13 (6211)
AC static transformer operated Watthour and VAR hour
meters for class 0.2s Category B (ABT compliant) metering
2.2 STANDARDS FOR METER READING INSTRUMENT
The Meter Reading Instrument (CMRI) shall conform in all respects to the following standards:
S. No. Standard No. Title
CBIP technical report no 111with latest amendment
Specification for Common Meter Reading Instrument
1.3 Equipments matching with requirements of other national or international standard which ensure
equal or better performance than the standards mentioned above shall also be considered. When the
equipment offered by the bidder conforms to standards other than those specified above, salient
points of difference between standards adopted and standards specified in this specification shall
beclearly brought out in the relevant schedule and copy of such standards along with their English
translation shall invariably be furnished along with the offer.
3.0 CLIMATIC CONDITIONS
The meters to be supplied against this specification shall be required to operate satisfactorily and
continuously under the following tropical conditions of hot, humid, dusty, rust and fungus p roneenvironment.
i) Max. ambient air temperature (°C) : 50
ii) Min. ambient air temperature (°C) : (-) 5
iii) Average daily ambient air temp. (°C ) : 32
iv)
Max. Relative Humidity (% ) : 95v) Min. Relative Humidity (% ) : 10
vi) Max. Altitude above mean sea level (m) : 1000
vii) Average Annual Rainfall (mm) : 1200
viii) Max. wind pressure (Kg/Sq.m) : 195
ix) Isoceraunic level (days per year) : 50
x) Seismic level (Horizontal Accn. in g) : 0.3
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 98/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
3/13 Technical specification, Volume-II
Section –VIII (METERS)
4.0 PRINCIPAL PARAMETERS
The energy meters shall be indoor type connected with the secondary side of outdoor current and voltage
transformers and mounted in control and relay panels
S. No. Item Specification
1 Type of Installation Indoor panel/ cubicle mounted
2 VT secondary 3x110/√3 V Phase to Neutral (3P4W) or 3x110 V Phase to Phase (3P3W)
Variation -30% to +15%
3 CT secondary 3 x /-1 Amps or 3 x /-5
4 Auxiliary AC/ DC Supply 110/ 220V (+ 20%)
5 System frequency 50HZ +/- 5%
6 Earthing System Solidly Grounded
The meter should be suitable for working with above supply variations without damage and withoutdegradation of its metrological characteristics.
5.0 TECHNICAL REQUIREMENTS
5.1 DISPLAY
The meter shall have Graphical LCD with backlight for proper depicting of values in user friendly
manner like graphs, values with unit, OBIS codes etc.
5.2 POWER FACTOR RANGE
The metering system shall be suitable for full power factor range from zero (lagging) through unity to
zero (leading). The metering module shall work as an active energy import and export meter along
with reactive (lag and lead) meter. The energy measurement should be true four quadrant type.
5.3 ACCURACY
Class of accuracy of the metering system shall be 0.2s for energy measurement. Each metering module
should have a built-in calendar and clock having an accuracy of 1 min per month or better. Then the
calendar and clock shall be sets at the manufacturer‟s work. The accuracy should not drift with time.
5.4 POWER CONSUMPTION OF METER
i) The meter must be capable to operate with the power drawn from the Auxiliary Power supply
(AC/DC) instead of Station VT power supply.
ii) Voltage Circuit: The active and apparent power consumption in each voltage circuit including
the power supply of metering module at reference voltage, reference temperature and reference
frequency shall not exceed 1 Watt per phase and 1 VA per phase respectively.
iii) Current Circuit: The apparent power taken by each current circuit at basic current, reference
frequency and reference temperature shall not exceed 1 VA per phase.
5.5 STARTING CURRENT
The metering module should start registering the energy at 0.1% Ib and unity power factor.
5.6 MAXIMUM CURRENT
The rated maximum current of the metering module shall be 200% of basic current (Ib).
5.7 The meter shall work accurately irrespective of phase sequence of the mains supply.
5.8 GENERAL CONSTRUCTIONAL REQUIREMENTS
Meters shall be designed and constructed in such a way so as to avoid causing any danger during use
and under normal conditions. However the following should be ensured:
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 99/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
4/13 Technical specification, Volume-II
Section –VIII (METERS)
1) Personnel safety against electric shock
2) Personnel safety against effects of excessive temperature
3) Protection against spread of fire
4) Protection against penetration of solid objects, dust and water in normal working
condition.
All the materials and electronic power components used in the manufacture of the meters shall be of
highest quality and reputed make to ensure higher reliability, longer life and sustained accuracy.
The meters shall be designed with application specific integrated circuits. The electronic components
shall be mounted on the printed circuit board using latest Surface Mount Technology (SMT).
All insulating materials used in the construction of meters shall be non-hygroscopic, non-aging and of
tested quality. All parts that are likely to develop corrosion shall be effectively protected against
corrosion by providing suitable protective coating.
The metering system when mounted in panel shall conform to the degree of protection IP51 in the
normal working condition of IS 12063/ IEC 529 for protection against ingress of dust and moisture.
5.9 MANUFACTURING ACTIVITIES
Meter should be manufactured using SMT (Surface Mount Technology) components and by
deploying automatic SMT pick and place machine and reflow solder process; the Bidder should own
such facilities.
1) Quality should be ensured at the following stages:2) At PCB manufacturing stage, each board shall be subjected to computerized bare board
testing.
3) At insertion stage all components should under go computerized testing for conforming to
design parameters and orientation.
4) Complete assembled and soldered PCB should under go functional testing using AutomaticTest Equipment.
5) Prior to final testing and calibration, all meters shall be subjected to accelerated ageing test
to eliminate infant morality.
6) The calibration of meters shall be done in-house.
5.10 SEALING
Proper sealing arrangement shall be provided in metering system as follows:
1) Two numbers sealing screws shall be provided on the front cover of metering module.
2) Provision shall be available to seal the back connections on the metering rack using the back
plate.
3) Provision shall be available to seal optical port.
The sealing arrangement should be suitable for application of Polycarbonate seals.
5.11 MARKING OF METER
The marking on every meter shall be in accordance with IS 14697/ IEC62053-22. The basic marking
on the metering module name plate shall be as follows:
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 100/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
5/13 Technical specification, Volume-II
Section –VIII (METERS)
i) Manufacturer‟s name and trade mark
ii) Serial Number
iii) Year of manufacture
iv) Type Designation
v) Number of phases and wires
vi) VT commissioning information
vii) CT commissioning information
viii) Reference frequency
ix) Accuracy Class
Additionally, following information shall also be available on name plate.
i) Property Of “Purchaser name”
ii) P.O. No. “Number”
5.12 The connection diagram of connecting the meter shall be depicted via suitable sticker pasted on
meter. The meter terminals shall be properly marked to identify voltage, Current, Auxiliary and
communication ports.
5.13 The meters shall be suitable for being connected directly through its terminals to VT‟s having a rated
secondary line- to- line voltage of 110 V, and to CTs having a rated secondary current of 1A or 5A. Any
further transformers/ transducers required for their functioning shall be in-built in the meters. Necessary
isolation and/or suppression shall also be built-in, for protecting the meters from surges and voltage spikes
that occur in the VT and CT circuits of extra high voltage switchyards.
5.14 The active energy measurement shall be carried out on 3 phase, 4 wire principle with an accuracy as
per class 0.2s of IEC 62053-22. The meters shall compute the active energy and load import; active energy
and load export from the substation bus bars during each successive 15 minute integration period block
and store it in its non volatile memory.
5.15 The meter shall compute the average frequency during each successive 15 minute block and store in
its memory.
5.16 The meter shall have Inputs/ Outputs pulsing pins availability. This shall help in transferring the
suitable energy parameters being recorded inside the meters on pulse output as well for SCADA
application at remote site.
5.17 The meter shall compute the reactive power on 3-phase, 4-wire principle, with an accuracy as per
relevant IS/ IEC standards, and integrate the reactive energy algebraically into two separate reactive
energy registers, one for the period for which the average RMS voltage is greater than 103% (Reactive
High), and the other for the period for which the average RMS voltage is below 97.0% (Reactive Low).
When lagging reactive power is being sent out from substations bus bars, reactive registers shall move
forward. When reactive power flow is in the reverse direction, reactive registers shall move backwards.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 101/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
6/13 Technical specification, Volume-II
Section –VIII (METERS)
5.18 Further, the reactive energy shall also be available in four different registers as
i) Reactive import while active import
ii) Reactive import while active export
iii)
Reactive export while active importiv) Reactive export while active export.
5.19 Active and Apparent energies shall also be made available by meter in separate energy registers as –
i) Active energy Import
ii) Active energy Export
iii) Apparent energy (while active import)
iv) Apparent energy (while active export)
5.20 Meter shall have provision to compute apparent energy based on lag only or lag+lead. The same shall
be configured at factory end.
5.21 The meters shall be compatible with ABT tariff as well as TOD tariff.
5.22 For reactive power and reactive energy measurement, limits of errors in all the four quadrants shall
be in accordance to IEC 62053-23/ IS14697.
5.23 Each meter shall have a calibration LED (visual) for checking the accuracy of active energy
measurement. Further, it shall be possible to switch over the same test output device to reactive energy via
suitable means provided on the metering system. This LED shall be visible from the front side.
5.24 The metering system shall normally operate with the power drawn through the auxiliary AC or DC
supply. The metering system design should enable the auxiliary supply to be switched automatically
between the AC and DC voltage, depending upon their availability. Typical auxiliary voltages available
are 110V AC and 110/ 220V DC. The system shall continue to work even if any one of the above
auxiliary supply (AC/ DC) is present.
5.25 Each metering module shall have a built-in calendar and clock, having an accuracy of one (1) minute
per month or better. The calendar and clock shall be correctly set at the manufacturer‟s works. An
automatic backup for continued operation of the meter‟s calendar -clock shall be provided through a long
life battery, which shall be capable of supplying the required power for at least two years under meter un-
powered conditions. The meters shall be supplied duly fitted with the batteries, which shall not require to
be changed for at least ten years, as long as total supply interruption does not exceed two years.
5.26 TOD (Time of day registers): The meter shall have TOD registers for active energy import and
export, apparent energy import and export and apparent MD import and export. Maximum eight time of
day registers including universal (0-24 hrs) register can be defined. It shall be possible to program number
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 102/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
7/13 Technical specification, Volume-II
Section –VIII (METERS)
of TOD registers and TOD timings through suitable high level software/ MRI as an authenticated
transaction.
5.27 Maximum Demand (MD) Registration: The meter shall continuously monitor and calculate the
average demand of configured parameter during the integration period set and the maximum, out of theseshall be stored along with date and time when it occurred in the meter memory. The maximum demand
shall be computed on fixed block principle. The maximum registered value shall be made available in
meter readings. The integration period shall be set as 15 minutes that shall be capable to change to other
integration period (30/ 60 minutes), if required, through suitable high level software/ MRI as an
authenticated transaction.
5.28 Maximum Demand Reset: Following provisions shall be available for MD reset in meter –
i)
Auto billing at predefined date and timeii) Manual via common MD reset button (optional)
iii) Authenticated transaction through suitable high level software/ MRI (optional)
5.29 The display shall be of Graphical LCD type with colored back-lit and soft push button. Individual
display shall be provided for all the meters housed in a metering rack. The display shall indicate direct
values (i.e. without having to apply any multiplying factor) of measured/ computed parameters as per the
meter commissioning. It should be possible to easily identify the single or multiple displayed parameters
through legends on the metering system display like OBIS codes etc. The register shall be able to record
and display starting from zero, for a minimum of 1500 hours, the energy corresponding to rated maximum
current at reference voltage and unity power factor. The register shall not roll over in between this
duration.
5.30 Each of the metering module shall display on demand & in Auto scroll mode the following
quantities/ parameters:
i) LCD segment check
ii) Date
iii) Time
iv) Cumulative active energy import
v) Cumulative active energy export
vi) Cumulative net active energy
vii) Cumulative reactive energy lag while active import
viii) Cumulative reactive energy lead while active import
ix) Cumulative reactive energy lag while active export
x) Cumulative reactive energy lead while active export
xi) Cumulative apparent energy (while active import)
xii) Cumulative apparent energy (while active export)
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 103/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
8/13 Technical specification, Volume-II
Section –VIII (METERS)
xiii) Cumulative Reactive High energy
xiv) Cumulative Reactive Low energy
xv) Last 15 minutes block average of active import energy
xvi) Last 15 minutes block average of active export energy
xvii) Last 15 minutes block average of the net active energy
xviii) Last 15 minutes block average frequency
xix) MD reset count
xx) Maximum demand apparent (while active import) for current month (0-24 hrs)
xxi) Maximum demand apparent (while active export) for current month (0-24 hrs)
xxii) Cumulative active import energy reading of predefined date and time for monthly billing
purpose
xxiii) Cumulative active export energy reading of predefined date and time for monthly billing
purpose
xxiv) Cumulative net active energy reading of predefined date and time for billing purpose
xxv) Cumulative apparent energy (while active import) reading of predefined date and time for
monthly billing purpose
xxvi) Cumulative apparent energy (while active export) reading of predefined date and time for
monthly billing purpose
xxvii) Maximum demand for apparent (while active import) of predefined date and time for monthly
billing purpose
xxviii) Maximum demand for apparent (while active export) of predefined date and time for monthly
billing purposexxix) Present anomaly status
xxx) Date of first occurrence of anomaly
xxxi) Time of first occurrence of anomaly
xxxii) Time of last restoration of anomaly
xxxiii) Date of last restoration of anomaly
xxxiv) Total anomaly count
There should be a facility to configure the display parameters in favourite pages.
5.31 Load Survey: Each metering module shall have a non-volatile memory in which the following shall
be automatically stored for each successive fifteen (15) minute block:
i) Active import
ii) Active export
iii) Average frequency
iv) Apparent while active import
v) Apparent while active export
vi) Reactive High energy
vii) Reactive Low energy
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 104/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
9/13 Technical specification, Volume-II
Section –VIII (METERS)
viii) Average line voltage
ix) Average line current
15-minute average of the above parameters shall be available for last thirty five (35) days. It shall
be possible to select either energy or demand view at Base Computer Software (BCS) end. Theload survey data should be available in the form of bar charts as well as in spreadsheets. The BCS
shall have the facility to give complete time synchronized load survey data both in numeric and
graphic form.
5.32 Billing parameters: The predefined date and time for registering the billing parameters of shall be
00.00 hours of the first day of each calendar (billing) month. Each meter shall store the following
parameters corresponding to defined bill dates for up to last six (6) months:
i)
Active energy importii) Active energy export
iii) Apparent energy (while active import)
iv) Apparent energy (while active export)
v) Maximum demand Apparent (while active import)
vi) Maximum demand Apparent (while active export)
5.33 Daily midnight parameters: The metering modules shall store following end day parameters for last
thirty five (35) days:
i) Active energy import
ii) Active energy exportiii) Reactive high energy
iv) Reactive low energy
5.34 Data Communication Capability:
The metering system should have a multiple communication ports for local reading, remote and on-line
communication facilities.
1. RS 485 port for periodic data transfer to Sub Station data logger / Computer. RS 485
communication port shall be suitable for interfacing multiple Energy Meters. It shall be
possible to download stored meter data on polling basis with the aid of a software schedule by addressing one meter at a time and downloading the stored data into the Sub Station data
logger / Computer / Data Acquisition Server.
2. Network port (TCP / IP based) for periodic transfer through communication mediums
like OFC, MPLS etc. to the Data Acquisition Server at remote station.
3. Galvanically isolated optical communication port in front of the meter for data transfer to
or from a hand held data Collection Device (Common Meter Reading Instrument „CMRI‟)
– conforming to IEC 62056 or CBIP Technical Report No. 111.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 105/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
10/13 Technical specification, Volume-II
Section –VIII (METERS)
The following ports are desirable as back up means of meter data acquisition
4. RS-232 port for periodic transfer through communication mediums like
GSM/GPRS/CDMA etc.
5. A USB port which will be an integral part of meter and available at front side of meter
covered suitably for sealing purpose. This USB port shall support reputed make pen-drive
for reading the meter data as an alternate media for MRI meter reading from optical port.
The Base Computer Software should be able to schedule the pen drive for meter reading.
The protocol used shall be open protocols (DLMS and MODBUS).
5.35 Each meter shall have a unique identification code i.e. serial number, which shall be marked on
name plate as well as in its memory. Further all meters of the same model shall be totally identical in all
respects except for their unique identification codes.
5.36 The meters shall safely withstand the usual fluctuations arising during faults etc. In particular, 115%
of rated VT secondary voltage applied continuously and 190% of rated voltage applied for 3.0 seconds,
and 20 times of rated CT secondary current applied for 0.5 seconds shall not cause any damage to or
malfunctioning of the meters. Further the immunity of metering system to external magnetic field shall
be as per latest CBIP recommendations.
5.37 Each meter shall have a non volatile memory in which the parameters as mentioned in this
specification shall be stored. The non volatile memory shall retain the data for a period not less than 10
years under un-powered condition; battery back up memory shall not be treated as NVM.
5.38 Meter shall have the capability and facility to compensate for errors of external measurement
transformers i.e. CT and VT:
i. Linear compensation for measurement PT errors (ratio and phase); there shall be linear adjustment
which shall be applied across the complete measurement range of the transformer.
ii. Non-linear compensation for measurement CT errors (ratio and phase) compensation; this shall allow
multiple ratio and phase adjustments to be applied for different load points per phase input of the meter.
It should be possible to program the errors of CT and VT in meter through front optical communication
port using compatible high level software. Metering system design should support this feature and further
it shall be possible to configure & incorporate this feature in meter at later stage whenever required.
5.39 The metering modules shall be draw out type with automatic CT shorting feature so as to ease the
testing/ replacement of meters without disturbing the system.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 106/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
11/13 Technical specification, Volume-II
Section –VIII (METERS)
6.0 ANOMALY DETECTION FEATURES
6.1 The meter shall have features to detect and log the occurrence and restoration of following anamolies,
along with date and time of event:
i) Phase wise Missing Potential – The meter shall detect missing potential (1 or 2 phases)
provided the line current is above a specified threshold. The voltage at that stage would
be below a specified threshold.
ii) Phase wise Current Circuit Reversal – The meter shall detect reversal of polarity
provided the current terminals are reversed. This shall be recorded for 1 or 2 phase CT
reversal.
iii) Voltage Unbalance – The meter shall detect voltage unbalance if there is unbalance in
voltages.
iv) Current Unbalance – The meter shall detect current unbalance if there is unbalance in
load conditions. Meter should ensure true system conditions before going for currentunbalance checks.
v) CT Miss – The meter shall detect current miss if the current is below a defined
threshold, provided the phase voltage is above a specified threshold.
Snapshots of phase wise voltage, phase wise active current and phase wise power factor shall be
provided with above specified anomaly events. Further, each meter module shall record the
following events along with total duration:
i)
Power On/Off – The meter shall detect power off if both the auxiliary supplies fail. Theevent shall be recorded on the next power up. At the same time power on event shall be
recorded. No snapshot shall be logged with this event.
ii) Feeder Supply Fail -This event shall be logged when feeder supply, i.e. all the voltages
goes below certain threshold. No snapshot shall be logged with this event.
6.2 Last four hundred fifty (450) events (occurrence + restoration), in total, shall be stored in the meter
memory on first in first out basis.
6.3 There shall be at least five separate compartments for logging of different type of anomalies :
Compartment No.1 100 events of Missing Potential
Compartment No.2 100 events of CT Reversal
Compartment No.3 100 events for Power Failure / Power On-Off
Compartment No.4100 events of Transaction related changes as per ICS
Category B
Compartment No.5 50 events of Magnet Interference
Once one or more compartments have become full, the last anomaly event pertaining to the same
compartment shall be entered and the earliest (first one) anomaly event should disappear. Thus, in this
manner each succeeding anomaly event shall replace the earliest recorded event, compartment wise.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 107/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
12/13 Technical specification, Volume-II
Section –VIII (METERS)
Events of one compartment/ category should overwrite the events of their own compartment/ category
only. In general persistence time of 5 min. for occurrence and restoration respectively need to be
supported in meter.
6.4 Anomaly count should increase as per occurrence (not restoration) of anomaly events. Total no. of counts shall be provided on BCS.
7.0 TRANSACTIONS
The meter shall record critical events (as performed in authenticated manner) of Time set, MD reset
operation and tariff change. These events shall be logged in roll over mode for up to twenty numbers.
8.0 SELF DIAGNOSTIC FEATURE
The meter shall be capable of performing complete self diagnostic check to monitor the circuits for any
malfunctioning to ensure integrity of data in memory location all the time. The meter shall have
indications for unsatisfactory/ nonfunctioning/ malfunctioning of the following:
i) Non volatile memory
ii) RTC battery
The above malfunctioning should be flagged in the meter memory and should be made available in meter
reading data.
9.0 TYPE TEST CERTIFICATES
The meters shall be fully type tested as per relevant standards IS 14697. The type test report of the meters shall
be submitted by bidder along with the offer. Type test reports shall not be more than 2 years old.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 108/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
13/13 Technical specification, Volume-II
Section –VIII (METERS)
GURANTEED TECHNICAL PARTICULARS
Sl. No. Technical Specification Requirements Bidder’s Offer
1. Manufacturer's name & Country
2. Type of Meter 3. Name and model no. of offered product
4. Standards to which meter complies
5. Accuracy classActive energy measurement
Reactive energy measurement
6. Metrology indicator provided on meter and switching facility for reactive &apparent energy
7. Variation of voltage at which systemfunctions normally
8. Minimum Starting current
9. Maximum current
10. P.F. range
11. Power consumption per phase
Voltage CircuitCurrent Circuit
12. AC and DC Auxiliary supply ratings for powering up the metering system
13. Sealing arrangement
14. Energy parameters recorded in meter
15. ABT compatibility
16. TOD compatibility
17. MD Reset provisionsAuto
Manual
18. Demand integration period
19. Load survey parameters recorded in meter
20. Billing parameters recorded in meter
21. Daily Midnight parameters recorded inmeter
22. Communication Capability for Local readingOn Line Remote reading
23. Facility of external CT/ VT error compensation
24. Anomaly detection features
25. Self diagnostics features
26. Magnetic immunity
27. Maximum nos of communication ports i.e.Optical, USB, RS232 etc.
28. DLMS Category B compliance as per IS15959
29. Product BIS & DLMS certificationnumber
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 109/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
1/3 Technical specification, Volume-II
Section –XI (MODEM)
TECHNICAL SPECIFICATION FOR GSM/GPRS MODEM
The offered modem shall be suitable for communication with electronic energy meter. The modem shall
be used for remote meter reading of electronic energy meters via GSM/ GPRS infrastructure with
suitable monitoring Software.
Various features of intelligent GSM / GPRS modem are described as below:
1. Power Supply Section:
a. The modem shall have three phase AC input supply and should be capable of proper
functioning within the power supply range of 50 to 540V AC, 50 Hz.
b. Withstand capacity against surges should be upto 6.0 kV.
2. Communication Interface:
a. The RS232 output shall be provided on a 9-pin female connector for connection to
electronic energy meter’s optical/ serial communication port through suitable
communication cable.
b. Communication to external world using GSM / GPRS.
3. GSM / GPRS Section:
a. The modem shall operate in Dual Band GSM 900/1800MHz. b. The modem shall be compliant with ETSI GSM Phase 2 Standard.
c. Class4 (2W) @ 900 MHz
d. Class 1 (1W) @1800 MHz
e. Circuit switch data transmission rate up to 14.4 Kbit/Sec.
f. GPRS class B and Multislot class 10 support
g. Packet Channel Support: PBCCH
h. Coding Schemes: CS1 to CS4
4. RF section:
a. SMA (F) interface shall be provided on the enclosure for Antenna connection.
b. The antenna should be of minimum 5 dbi gain.
5. SIM Card Section:
For placing the SIM Card, a SIM card holder shall be provided on the modem and shall be accessible
from outside without opening the modem enclosure.
a. The SIM Card supported shall be of 3V Interface.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 110/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
2/3 Technical specification, Volume-II
Section –XI (MODEM)
b. SIM card holder shall be provided with suitable sealing provision on the device cover.
6. Network Identification Section:
a. The modem shall perform auto network registration at power up.
b. Three different coloured LEDs shall be provided on the modem which shall depict the
current functioning status.
c. Power / Network Registration / Signal strength - RED colour
d. Data transfer between Meter and Modem - Yellow colour
e. Data transfer on GSM / GPRS - Green Colour
7. IS/IEC Specifications:
The modem shall meet the following IS/IEC specifications:
1. Impulse voltage test IEC61000-4-5(95-03)
2. AC voltage test IS13779:1999
3. Insulation resistance test IS13779:1999
4. Electrostatic Discharge (ESD) IEC61000-4-2(1995-02)
5. Electromagnetic radiated HF susceptibility IEC61000-4-3(1995-02)
6. Fast transient Burst test IEC61000-4-4(1995-02)
7. Radio Interface Measurement (CS) IS6842
8.
Surge Immunity test IEC61000-4-69. Dry Heat Test IS-13779:1999
10. Cold Test IS-13779:1999
11. Damp Heat Cyclic Test IS-13779:1999
12. Vibration test IS-13779:1999
13. Shock test IS-13779:1999
14. Spring Hammer test IS-13779:1999
8. Environmental specifications:
a. Operating temperature range : -10 degrees to +55 degree
b. Humidity : 95% RH (non – condensing)
9. Mechanical Specifications:
a. Mounting Arrangement: A suitable wall mounting arrangement shall be provided.
b. The modem shall comply with IP55 rating.
c. Sealing Arrangement: The base and top cover shall have a suitable sealing arrangement
d.
The modem shall be housed in an enclosure of engineering plastic.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 111/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
3/3 Technical specification, Volume-II
Section –XI (MODEM)
10. Memory:
The modem shall have minimum memory of 256 KB.
11. Functional specifications:
a. The modem should be an intelligent device and capable of providing the following
functionalities on GSM/ GPRS network with suitable AMR Software:
b. The modem should establish the communication channel between meter and Central station
software for data transfer.
c. It shall be possible to configure the modem to work with any make of meter in transparent
mode.
d. It shall be possible to configure the modem for communication media (GSM/GPRS), Baud
rate, and GPRS settings (i.e APN number, user name and password)e. Modem shall send SMS on power off and power on condition.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 112/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
1/8 Technical specification, Volume-II
Section – VIII (SRS)
TECHNICAL SPECIFICATION OF SOFTWARE
Table of Contents
1. Introduction 3
1.1. Objectives 3
1.2. System Requirements 3
2. Online Data acquisition at Local station 3
2.1. Polled parameters 4
3. AMR Architecture 4
4. Online monitoring 5
4.1. Screen Display 5
4.2. Parameters acquired 5
5. Master Data entry modules 6
6. Off-line reporting modules 7
7. Login Admin 8
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 113/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
2/8 Technical specification, Volume-II
Section – VIII (SRS)
1. Introduction
1.1. Objectives
The purpose of this software is to perform following functions.
1. Acquire & Validate data by polling meters.
2. Store validated data in database.
3. Generate auto-refreshing online monitoring report
4. Generate historical data reports (offline) with print.
5. Ability to generate Transformation/Transmission loss report.
6. Ability to accept the data from DCD and store it in its memory
7. Display the collected data on PC’s screen, with configurable parameters on tabular views.
8. Ability to transmit 1 minute or 15 minute data through an appropriate communication
link to the control data center.
9. The Software shall ensure that absolutely no tampering of metering data possible during
the downloading/pulling by the PC.
10. Central data center will have facility to manage ABT schedules and will perform UI
charges and Energy charge calculations.
11. Central data center will have facility to generate ABT reports exportable to excel format.
1.2. System Requirements
(i) Substation
a. Intel® Xeon® X5492 (Quad Core) 3.40 GHz & 12MB Cache
1600 MHz FSB
8 GB DDR2 RAM
146GB SAS 15k rpm & 3.5" Hot Swap
1024X786 Display
MOXA RS-485/RS-232 converter.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 114/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
3/8 Technical specification, Volume-II
Section – VIII (SRS)
Windows 2008 server or later
Microsoft Office.
SQL server version 2008 or later installed on same PC connected over LAN
(ii) Central data center
Application cum web server
a. Intel® Xeon® X5409 Quad Core (2No) 3.40 GHz & 12MB Cache
1600 MHz FSB
8 GB DDR2 RAM
146GB SAS 15k rpm & 3.5" Hot Swap
1024X786 Display
Windows 2008 OS or later.
Database server
b. Intel® Xeon® X5409 Quad Core (2 no) 3.40 GHz & 12MB Cache
1600 MHz FSB
32 GB DDR2 RAM
146GB SAS 15k rpm & 3.5" Hot Swap
1024X786 Display
SQL server 2008 or later
2. Online Data acquisition at Local/Remote station
Only MeECL meter with RS485/TCPIP connected to ABT system will only communicated
with ABT software.
Client software will work if the Local Area network is working properly. S/W will poll
meters on modbus and DLMS protocol at 1 minute and 15 minutes intervals. S/W will
validate this data and store it in database which is located at local/central station.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 115/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
4/8 Technical specification, Volume-II
Section – VIII (SRS)
System shall provide necessary configuration mechanism for smooth operation of system
like:
Software configuration (installation), Database shutdown/restart
Defining monitoring location and its structure: The parameters include (but notlimited to) name, number of units and associated properties like equity, generation
capacity, line loading capacity etc.
Defining Fuel cost, customer tariffs for final gain/loss results
Defining business rule: The base for calculation of Unscheduled Interchange Charge,
Incentive etc.
User Management: Creating and managing different users, assigning rights for
performing different operations.
Maintaining alarm rules
2.1. Polled parameters
Meter data will be polled by software at every 1 minute and 15 minutes based upon
appropriate communication infrastructure/technology available and the same will be stored in
local/remote database. All ABT meter should be connected with the ABT system with RS485
converter and TCPIP.
• Instantaneous MW,
• Instantaneous MVAR,
• Instantaneous Freq,
• Previous interval KWh,
• Previous interval Freq
• 1 minute snapshot of data
• 15 minute load survey
• Read frequency will be 1 minute and 15 minutes
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 116/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
5/8 Technical specification, Volume-II
Section – VIII (SRS)
3. System Architecture.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 117/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
6/8 Technical specification, Volume-II
Section – VIII (SRS)
4. Online monitoring
This Online (Server and Client) will be available at all stations depend on LAN cabling.
Online monitoring screen will have following details and similar format as shown.
4.1. Parameters acquired
Following parameters will be acquired on 1minute or 15 minute from interface feeder meters
Parameters Details
Block Current Block number
Start Time Current Block Start Time
Rem’n Time Remaining time in current Block
Average Frequency of block
Average Voltage of block
Instantaneous Current of block
Unscheduled interchange (UI)
MW
Block
UI=AG – SG
Total export MW
Total Million Units export
Total import MW
Total Million Units export
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 118/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
7/8 Technical specification, Volume-II
Section – VIII (SRS)
6. Off-line reporting modules
Following off-line reporting modules will be provided.
7/27/2019 MeteringProject Volume II
http://slidepdf.com/reader/full/meteringproject-volume-ii 119/119
MEGHALAYA POWER TRANSMISSION CORPORATION LIMITED
Column B.
Count of blocks as per condition
Column C.
Calculate sum of AG & DC in particular frequency band
= ( sum of AG / Sum of DC) * !00
Column D.
Maximum AG % of DC in particular frequency band. Same as mentioned in Basic offline
report.
Column E.
Locate maximum DC in complete day
= (average DC / Maximum DC) * 100
V. UI Performance Report. (Graph)
X Frequency
YAG%DC
7. Login Admin.
Admin Module : Last Two Login of Each User
Recommended