TECHNICAL SPECIFICATIONS FOR 220KV, 4400Pf … Office/0...The Composite hollow insulators for CVTs shall confirm to IEC 61462-2007-02. This composite hollow insulator shall consist

GETCO/E/TS-220KV CVT with CHI 0802A/R0 Jun15

Sign & Seal of Bidder

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GUJARAT ENERGY TRANSMISSION

CORPORATION LTD.

SARADAR PATEL VIDYUT BHAVAN, RACE COURSE, BARODA – 390 007.

TECHNICAL SPECIFICATIONS

FOR

220KV, 4400Pf CVT WITH COMPOSITE

HOLLOW INSULATOR




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SPECIAL INSTRUCTIONS TO BIDDER

Please read following instructions carefully before submitting your bid.

1. All the drawings, i.e. elevation, side view, plan, cross sectional view etc.,

in AutoCAD format and manuals in PDF format, for offered item shall be

submitted. Also the hard copies as per specification shall be submitted.

2. The bidder shall submit Quality Assurance Plan for manufacturing

process and Field Quality Plan with the technical bid.

3. The bidder shall have to submit all the required type test reports for the

offered item. In case of non-submission of the type test reports with the

offer, the bid shall be liable to be rejected.

4. The bidder must fill up all the point of GTP for offered item/s. Instead of

indicating “refer drawing, or as per IS/IEC”, the exact value/s must be

filled in.

5. All the points other than GTP, which are asked to confirm in technical

specifications must be submitted separately with the bid.

6. The bidder is required to impart training in view of manufacture,

assembly, erection, operation and maintenance for offered item, at his

works, to the person/s identified by GETCO, in the event of an order, free

of cost. The cost of logistics will be bear by GETCO.

7. Please note that the evaluation will be carried out on the strength of

content of bid only. No further correspondence will be made.

8. The bidder shall bring out all the technical deviation/s only at the

specified annexure.

9. The bidder should indicate manufacturing capacity by submitting latest

updated certificate of a Chartered Engineer (CE).



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QUALIFYING REQUIREMENT DATA (For Supply)

Bidder to satisfy all the following requirements.

1) The bidder shall be Original Equipment Manufacturer (OEM). The

offered equipment have to be designed, manufactured and tested as

per relevant IS/IEC with latest amendments.

2) The minimum requirement of manufacturing capacity of offered

type, size and rating of equipment shall be 3 times tender / bid quantity. The bidder should indicate manufacturing capacity by

submitting latest updated certificate of a Chartered Engineer (CE).

3) Equipment proposed shall be of similar or higher rating and in

service for a minimum period of THREE (3) years and satisfactory

performance certificate in respect of this is to be available and

submitted.

4) The bidder should clearly indicate the quantity and Single Value

Contract executed during last FIVE (5) years, for the offered

equipment. Bidder should have executed one single contract during

last five years for the quantity equivalent to tender / bid.

The details are to be submitted in following format,

SR.

NO

ITEMS

SUPPLIED

TO

ORDER

REFERENCE

NO. & DATE

ITEMS

QUANTITY

ORDER

FULLY

EXECUTED

YES/NO

STATUS, IF

ORDER

UNDER

EXECUTION

REMARK

5) Equipment offered shall have Type Test Certificates from

accredited laboratory (accredited based on ISO/IEC Guide 25 /

17025 or EN 45001 by the National accredition body of the

country where laboratory is located), as per IEC / IS / technical

specifications not older than FIVE (5) years and shall have validity

till expiry of validity of technical bid.



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1. REQUIREMENT :

The equipment offered shall be highly reliable suitable to operate

satisfactorily in hot humid and polluted climate. The equipments offered

shall work satisfactorily within temperature range of 0C to 50C and

relative humidity of 95% non-condensing. It shall be suitable for satisfactory

working in normally polluted atmosphere.

2. SPECIFICATION :

The equipment is required for 220KV system. The system data is given as

under:

2.1 SYSTEM PARTICULARS

Line Voltage ………………………………………….. 220 kV

Max. System Voltage ………………………………… 245 kV

Rated Power Frequency ………………………………. 50 Hz

Rated system continuous current ……………………. 1250 A

Maximum Thermal short

Current for 1 Sec. …………………………………….. 31.5 kA

Dynamic Limiting Current ……………………………. 38.5 kA

2.2 STANDARDS :

The equipment shall meet the following ISS and IEC standards with latest

amendment:

IS: 3156 - Specification for voltage transformer.

IEC: 61462 - Composite Hollow Insulators

IS : 335 - Insulation Oil for transformers and switch Gears.

IEC : 186 & - Specification for voltage transformers.

IEC : 186 A

IEC : 270 - Partial Discharge Measurement

IEC : 358 - Coupling capacitors and capacitor Dividers.

IEC : 60044-5 - Capacitor Voltage transformer

IEC : 61869-1 - Instrument transformer- Part 1: General requirements



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Unless otherwise stated elsewhere in the specification, the rating as well as

performance & testing of the instrument transformer shall confirm but not

limited to the latest revision and amendments available at the time placement

of order of all relevant standards listed above.

The design, manufacture and performance of the equipment shall comply

with all currently applicable standards, regulation and safety codes in the

locality where the equipment will be installed. Nothing in this specification

shall be construed to relieve the supplier of his responsibility.

2.3 G E N E R A L :

The 220KV CVTs are required for PLCC, station metering, synchronisation

and protection of 220KV Transmission Lines. The equipment is required for

connecting high frequency equipment to high voltage line. It shall be

suitable for operating from 40 KHz to 500 KHz. It shall have high frequency

capacitance of 4400pF. HF terminal shall be provided for connecting PLCC

equipment.

2.4 CONSTRUCTION :

CVT shall comprise of a capacitor divider unit and an electromagnetic unit

so designed and interconnected that the secondary voltage of electromagnetic

unit is substantially proportional to and in phase with the primary voltage

applied to the capacitor divider units. If a carrier frequency coupling device

is introduced into the earth lead of intermediate voltage capacitor the error

introduced by this device shall be negligible at rated frequency in relation to

the errors of CVT. The dielectric material shall be mixed type i. e. paper and

polypropylene material. The material and construction and assembly of CVT

shall be such that capacitance does not change with time and the effect of

temperature is minimum.

The live metal surface, nuts and bolts used for the connection of two

capacitor stacks shall be either of brass or tinned copper to provide good

electrical connection. Corona shield and high voltage terminal studs shall be

of copper/Aluminum.

The intermediate electromagnetic circuit of CVT shall be provided with

necessary device like, series choke coil or reactance unit to minimise the

draining of carrier signal through the electromagnetic unit. It will be

provided with an over voltage suppressor to protect the electromagnetic unit.

The HF terminal of CVT shall be brought out through a bushing rated for 11

kV-class minimum.



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The internal insulation level of CVT shall be higher compared to external

insulation to prevent damage to internal insulation. Material used in the

insulation and assembly of the winding shall be insoluble, non-catalytic, and

chemically inactive in hot transformer oil and shall not be subjected to a

shrinking and seasoning process to avoid further shrinking during service.

The capacitor stacks and windings shall be suitably supported and

permanently secured at frequent intervals so that no shifting occurs due to

dynamic forces developed by short circuit and that during transportation. All

the winding shall be of electrolytic copper.

CVTs shall be hermetically sealed with non-breathing type of bellow

arrangement with first filling insulating oil confirming to latest IS: 335 or

better quality of oil. Suitable arrangements shall be provided for expansion

and contraction of oil due to operating temperature variations, without

affecting property of insulating materials, oil etc. In case, inert gas sealing is

used, pressure relief device shall be provided. The arrangement provided

shall be described in details.

All exposed ferrous parts like tank, expansion chamber, terminal box etc.,

shall be of high quality steel, and shall be hot dip galvanized confirming to

IS: 2633. Steel surface coming in contact with oil shall be coated with oil

resisting varnish. All fasteners shall be hot dip galvanised. The construction

of the tank including fitting of capacitor unit shall be such that there shall not

be any oil leakage. In case of any leakage, it should be possible to attend it

on site.

The Composite hollow insulators for CVTs shall confirm to IEC 61462-

2007-02. This composite hollow insulator shall consist of a load-bearing

insulating tube made of resin impregnated fibres, a housing (outside the

insulating tube) made of elastomeric material (silicone or ethylene-

propylene) and metal fixing devices at the ends of the insulating tube. The

loads shall be transmitted to the tube by metal fittings. External insulating

part of composite hollow insulator shall provide necessary creepage distance

and protects tube from environment. Composite hollow insulators are

intended for use with CVT filled with insulating oil for outdoor installation

suitable for operation under following tropical conditions, with high

temperature, humidity and rainfall.



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The climatic and isoceraunic conditions at site are given below:

a. Maximum ambient temperature in shade. (◦C) 50

b. Minimum ambient temperature in shade. (◦C) 04

c. Maximum average ambient temperature. (◦C) 40

d. Maximum yearly average ambient temp. (◦C) 30

e. Maximum relative humidity. (%) 95

f. Average rainfall per annum. (Cm) 150

g. Average number of thunder storm days per annum 15

h. Height above Sea level. (Meters) Not exceeding 1000

i. Maximum wind pressure. (Kg / m2 ) 150

j Earthquake acceleration. (g) 0.08 x 2 g

The equipment offered shall be suitable for continuous operation at their full

rated capacity under the above conditions.

Since the sub-station may be near the sea-shore and/or in an industrial area, the

equipment offered shall be suitable for heavily polluted atmosphere.

The design of composite hollow insulator shall be defined by materials of

fittings, jointing, materials of insulating body and end fittings with method of

attachment, housing layer thickness over insulating tube.

A type of an insulating pressurized enclosure shall be considered as appropriate

for intended use only after the electrical equipment of which it is a part has

satisfactorily passed the type tests called for by the particular standards with

which the equipment must comply.

FRP tube which is being used for manufacturing composite hollow insulator,

the quality of impregnation of the FRP tube shall be checked by methods, “Dye

penetration” and “water diffusion” of IEC 62217. In addition, the minimum

design value of the glass transition temperature, Tg, of the FRP tube shall be

verified by using the Tg measurement method as per IEC 61006.

The equipment manufacturer shall specifies the mechanical loads for the

composite hollow insulator on the basis of weighted stresses arising from

various service loads viz.. Terminal loads, wind loads, ice loads, short-circuit

loads and seismic loads. CVT with voltage terminal shall withstand static test

load of 1250 N in any direction when applied to primary terminal.



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Electrically the insulator type shall be defined by its arcing distance, creeepage

and housing profile, while mechanically, by its length, tube/core diameter, its

material & design and method of attachment.

Imported insulator meeting electrical and mechanical characteristics will be

accepted if only they are offered against suppliers import license and the transit

breakages if any, are also covered by the supplier for replacement of material

from their stock.

The successful bidder shall indicate all relevant dimensions and values

necessary for identifying and testing the insulator in accordance with applicable

standard. Each insulator shall be marked with the name or trademark of the

manufacturer, the year of manufacture, Maximum Mechanical Load (MML),

Maximum Service Pressure (MSP), Specified Mechanical Load (SML) and

Specified Internal Pressure (SIP). These markings shall be legible and indelible.

The transport, storage and installation shall be in line with IEC 62217.

Relation of mechanical loads, i.e. “Mechanical Loads from outside applied to

the insulator” and “Pressure applied to the insulator” shall meet requirements as

follows.

Table-1- Mechanical loads applied to the insulator

Load Relation Tube is in:

Maximum mechanical load

(MML) which is the design load

for the equipment manufacturer

= 1.0 x MML Reversible elastic phase

Damage limit ˃ 1.5 x MML Reversible elastic phase

Type test SML (Specified

Mechanical Load) bending load

= 2.5 x MML Irreversible plastic phase

Failure bending load ˃ 2.5 x MML Irreversible plastic phase

Table-2- Pressures applied to the insulator

Load Relation Tube is in:

Maximum service Pressure (MSP)

which is the design pressure for the

equipment manufacturer

= 1.0 x MSP Reversible elastic phase

Routine test pressure = 2.0 x MSP Reversible elastic phase

Damage limit ˃ 2.0 x MSP Reversible elastic phase

Type test pressure = 4.0 x MSP Irreversible plastic phase

Specified internal pressure (SIP) ≥ 4.0 x MSP Irreversible plastic phase



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The terminals for external connections shall be so mounted as to enable easy

connection and disconnection.

CVTs including composite hollow insulators shall be sufficiently strong to

withstand external stresses due to wind pressure, earthquake, short-circuit

and conductors pull at the terminals. The minimum creepage distance for

insulator housing shall be as per IEC: 358 for very heavy polluted

atmosphere (i.e. 31mm/KV). CVTs shall be suitable for hotline washing.

Secondary terminals of CVTs shall be brought out in a weather proof

outdoor terminal box having enclosure protection of minimum IP-55 as per

IS: 2147. The terminal box shall be provided with blank gland plates of

adequate size. The secondary terminal box of CVT shall include necessary

HRC fuses for protection of secondary circuits. For purpose of fuse

supervision, both the sides of the fuse shall be terminated on terminal block.

The terminals for metering core shall be brought out in separate sealable

compartment/box.

Each CVT winding shall be provided auxiliary terminals on terminal block

complete with necessary incoming connections.

HF Auxiliary bushing shall be provided suitably so that HF connection can

be made without affecting main bushing. The arrangement for taking HF

connection shall be described.

CVT s shall be provided with two secondary windings i.e. one for metering

and one for protection, each having following particulars:

Winding Purpose Burden Accuracy Primary

Voltage

Secondary

Voltage

No. 1 Metering 50 VA 0.2 220 kV

3

110 V

3

No. 2 Protection. 50 VA 3 P 220 kV

3

110 V

3

The Simultaneous burden shall be 100VA at 0.2/3P class of accuracy.

The voltage factor shall be 1.2 for continuous and 1.5 for 30 Seconds rating.

CVTs shall be provided with necessary clamps complete in all respect

for Single ACSR Moose Conductor for connecting to high voltage line.



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CVT shall be fully protected against high voltage oscillations and lightening

surges. The bidder shall provide complete write up for protection provided.

Steel pedestal for mounting the CVT if ask to supply for the Quantity shown

in the Schedule, then the same shall be offered as per the technical

specification of the structure and the drawing for given details of Base Plan,

Top View & Foundation bolt . The pedestal shall have facility to mount

Coupling Devices and Protective Device. The detailed drawing shall be

furnished.



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3. TESTING

3.1 TYPE TESTS

3.1.1 TYPE TESTS FOR CVT:

The Bidder shall have to submit report from NABL laboratory for following

type tests performed on CVT with the tender bid.

1. Temperature rise test on EMU

2. Lightning impulse voltage withstand test

3. Chopped impulse withstand voltage test (Wet)

4. Power frequency withstand voltage test (Before & After SC)

5. Capacitance & dielectric dissipation factor measurement before and after

HV test

6. Capacitance & dielectric dissipation factor measurement (Before & After SC)

7. Partial discharge test (Before & After SC)

8. Ferro resonance test (Before & After SC)

9. Short circuit withstand capability test

10. Transient response test

11. High frequency capacitance & equivalent series resistance test

12. Test for determination of Temperature coefficient (For Model capacitor

to be used for offered CVT)

13. RIV

14. Visual corona

15. Accuracy Test (Before & After SC)

16. Discharge test

17. Measurement of stray capacitance & stray conductance

18. IP55 test on secondary terminal Box.

19. Tightness test on EMU

20. Tightness test of liquid filled capacitor voltage divider (Before & After SC)

21. Verification of terminal marking

22. Power frequency withstands test on electromagnetic unit (Before & After SC)

23. Power frequency withstands test on secondary terminals (Before & After SC)

24. Seismic & Mechanical withstand test (Special Test)

3.1.2 TYPE TESTS FOR CARRIER FREQUENCY ACCESSORIES

When a carrier frequency accessory is connected by the manufacturer into the earth

lead of the intermediate voltage capacitor, it should be type tested for following

tests.



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1. Type tests for drain coil

a. Impulse voltage test

b. Voltage withstand test

2. Type test for voltage limitation device

a. Impulse voltage test

3.2 TESTING REQUIREMENT FOR COMPOSITE HOLLOW INSULATOR:

The bidder shall clearly state in their tender whether they have in their factory

adequate facilities for carrying out type tests and routine tests as specified in

related IS & IEC and its latest amendments. Offers of those firms who have

necessary equipment in their factory for carrying out type tests will be preferred.

Bidder shall submit along with the bid all the reports of design tests, type tests,

Sample tests and routine tests in line with IEC 61462: 2007 amended up to date

from the NABL laboratory. The reports shall not be older than Five years from

the date of validity of offer. If the reports are not available from NABL

laboratory, bidder shall submit confirmation for carrying out the same in the

event of an order, free of cost to GETCO, before commencement of supply,

without affecting delivery schedule.

3.2.1 LIST OF DESIGN TESTS:

1. Reference dry power frequency flashover test (Cl. 7.2.2)

2. Thermal-mechanical pre-stressing test (Cl. 7.2.3)

3. Water immersion pre-stressing test (Cl. 7.2.4)

4. Steep-front impulse voltage test (Cl. 7.2.5.2)

5. Dry power frequency voltage test (Cl. 7.2.5.3)

6. Internal pressure- stage 1- gas leakage test (Cl. 7.2.5.4.1)

7. Internal pressure- stage 2- water leakage test (Cl. 7.2.5.4.2)

8. Tests on shed and housing material (Cl. 7.3)

9. Tests on the tube material (Cl. 7.4)

3.2.2 LIST OF TYPE TESTS:

1. Internal pressure test- stage 1 (Cl. 8.4.1.1)



4. Bending test – stage 1 (Cl. 8.5.1.1)






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3.2.3 LIST OF SAMPLE TESTS:

1. Mechanical test – stage 1 (Cl. 9.4.1.1)



4. Galvanizing test (Cl. 9.5)

5. Check of the interface between fittings/housing (Cl. 9.6)

3.2.4 LIST OF ROUTINE TESTS:

1. Routine pressure test (Cl. 10.3)

2. Routine mechanical test (Cl. 10.4)

3. Routine tightness test (Cl. 10.5)

The equipment offered must have been type tested after manufacture in India.

Equipment shall be again type tested if required by the purchaser in presence of

purchaser or/and any third party. Measurement of HF capacitance and

equivalent series resistance within the frequency range 40 to 500 kHz should

have been carried out and it should meet IEC 358 Clause: 10. If required this

test will be carried out again. The test report for high frequency measurement

shall be enclosed with technical bid.

3.3 FACTORY ROUTINE TESTS

3.3.1 FACTORY ROUTINE TESTING REQUIREMENT FOR CVT

Each unit of CVT‟s lot shall be tested for following tests before offering it

for acceptance testing.

1. Capacitance and dielectric dissipation factor measurement before and after

HV tests

2. Power frequency voltage withstands test

3. Partial discharge test

4. Power frequency voltage with stands test on NHF terminal

5. Power frequency voltage withstands test on secondary winding of EMU

6. Power frequency voltage withstands test on primary winding of EMU

7. Ferro resonance test (three times at 0.8 Um and three times at 1.5 Um)

with wave form results

8. Sealing tests

9. Measurement of ratio and phase angle error

9.1 Metering winding (0.2 accuracy class) : For 25%, 100% &

Simultaneous burden at each 80%, 100% and 120% of rated voltage



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9.2 Protection winding (3P accuracy class) : For 25%, 100% &

Simultaneous burden at each 5 %, 100% and 150% of rated voltage

10. Measurement of coupling capacitance and dielectric dissipation factor for

both capacitor dividers as well as for CVT completely assembles with

EMU. The corresponding values measured for complete CVT shall be

incorporated rating plate as CC= XXXX PF and Tan δ (With EMU in

GST mode)

11. Terminal marking & polarity verification

3.3.2 FACTORY ROUTINE TESTING REQUIREMENT FOR CARRIER

FREQUENCY ACCESSORIES

1. Routine tests for drain coil

a. Measurement of impedance at power frequency

b. AC test

2. Routine test for voltage limiting devices

a. Measurement of the spark-over voltage with power frequency

(Air-gap arrester)

b. AC test with the continuous rated withstand voltage

3.4 ACCEPTANCE TESTING REQUIREMENT FOR CVT :

All the tests mentioned at 3.3 above shall be carried out, on selected samples of

CVT as per approved MQP, in presence of purchaser's representative and/or

any third party as decided by the purchaser.

4 DRAWINGS :

The following drawings indicating all the dimensions and weight etc. with

complete technical details shall be enclosed together with technical bid:

1. General Arrangement Drawing

2. Rating & Diagram Plate for 245KV CVT

3. Secondary terminal Box having separate sealable compartment with

locking arrangement for metering core having class of accuracy 0.2

4. Sectional view for 245KV CVT

5. Terminal connector suitable for Single moose ACSR conductor

6. Composite hollow insulator with detail of all dimensions and technical

parameters

The offer without the above drawings and insufficient technical data, will not be

considered to evaluate the bid technically



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CD for the softcopy of the same shall be provided with the tender bid.

5. OIL LEAKAGE AND OIL FILLING :

The bidder shall indicate clearly whether oil leakage problem can be attended at

site and topping of oil carried out.

In case of oil leakage during guarantee period, supplier shall attend the

same free of cost. If CVT will require to be taken to works, supplier shall

do so at his cost and arrange for replacement CVT if required by the user.

6. PACKING :

The CVTs shall be dispatched properly packed so that there is no damage

during transportation. All warning and instruction shall be in Red Bold letters

on outside of packing for handling the CVT during transportation. The rest of

warning and instruction etc. shall be on CVT tank in Red Colour.

7. INSTRUCTION MANUAL :

One Erection and Commissioning Manual shall be provided for each CVT and

shall be dispatched together with CVT. Two copies of instruction Manual with

CD for soft copy shall be provided with the tender bid.

8. SCOPE OF SUPPLY :

The following items are included in the scope.

(i) CVT complete in all respect with composite hollow insulator.

(ii) Clamps & connectors

(iii) Pedestal structures for mounting CVT ( if required)

(iv) O&M Manual along with drawings

The manufacturer's scope of supply covers design, manufacture, assembly,

stage inspection, testing at supplier's works, packing for shipment and delivery

of equipment to the store in safe condition in accordance with this specification.

The Bidder shall have to provide all the „Guaranteed Technical Particulars‟ as

per Schedule-A (GTP) & details of „Technical documents /Type tests for CVT/

Type tests including Design tests, Sample tests and Routine tests reports for

composite hollow insulator to be submitted‟ as per Schedule-B.

The GTP submitted by the bidder in the offer, if not found as per the Schedule-

A & if any of the type tests report for CVT and type tests report including

design tests report, sample tests report & routine tests report for composite



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hollow insulator from the list given above found to be more than 5 Years old on

the date of opening of the tender, then offer will be rejected without any prior

confirmation. Also if any report from stated above not submitted then it shall be

indicated clearly by the bidder in the schedule of deviation.

9. SPECIAL CONDITIONS

The following information shall invariably be furnished by the tenderer along

with the tender, if the same is not furnished along with the tender, the offer may

be ignored without making correspondence.

a. Name and full address of the manufacturer of composite hollow insulators

to be used with CVT

b. Make and Electrical & Mechanical characteristics of composite hollow

insulator.

c. Testing facilities available with the factory for carrying out Design tests,

type tests, Sample tests and routine tests.

d. Dimensional drawings with full particulars.

e. The list of orders executed by the manufacturer of the composite hollow

insulator giving full details such as voltage, type, quantity etc.

f. Bidder shall furnish, MQP and FQP along with technical bid.



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SCHEDULE – A (Part-1 & Part-2)

GUARANTEED TECHNICAL PARTICULARS FOR CVT (part-1)

( To be submitted with the tender)

Sr. No. D e s c r i p t i o n Details

GENERAL

1. Manufacturer's name & address

2. Model No.

3. Mounting

4. Type

5. Installation

6. Suitable system Frequency

7. Applicable standards

8. Rated Primary voltage kV (rms)

9. Highest voltage kV (rms)

10. Maximum temperature rise above :

ambient temperature of 50 C

11. Type of dielectric material :

CAPACITOR DIVIDEER

1. Capacitance values at rated frequency

And at rated temperature for:

High voltage capacitor 'C1' pF

Intermediate voltage capacitor 'C2' pF

Total Equivalent capacitance pF

Rated temperature at which above

values are indicated C

Capacitance temperature coefficient

2. 1.2x50 micro sec. Lightning impulse

With stand test voltage for capacitor

unit kVp

3. 1 minute power frequency withstand

voltage kV (rms)

4. Radio interference voltage (max)

at 156 kV (rms) volts

5. Visual corona extinction voltage kV



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6. Variation in capacitance of total

rated capacitance over entire range

of carrier frequency

7. Tan delta value of capacitor unit

8. Total creepage distance of insulator mm.

9. Rated intermediate voltage kV

10. Equivalent series resistance over

entire range of carrier frequency ohms

11. Partial discharge level at rated voltage pico col.

ELECTROMAGNTIC UNIT

1. Rated primary voltage kV

2. Rated secondary voltages

First winding volts

Second winding volts

3. Rated voltage factor

continuous

short time

Duration sec.

4. Rated burden of secondary winding

First winding VA

Second winding VA

Simultaneous VA

Rated power factor of burden

5. Accuracy class of secondary

First winding

Second winding

Phase angle error

6. Insulation withstand test voltages

Rated voltage class of primary kV

Capacitor divider unit kV

Earth terminal of capacitor

Voltage device kV

Primary winding of electromagnetic

unit kV



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7. Whether the earth terminal of the

voltage divider provided Yes/No

If yes, the rated voltage

1 minute power frequency

Withstand voltage kV

8. Whether series reactance/choke/

Compensating coil provided Yes/No

If yes, Rated voltage kV

1 minute power frequency test voltage kV

9. Terminal box details

@ Degree of protection as per IS: 2147

@ Whether cable glands provided Yes/No

10. Class of insulation.

11. Rated intermediate voltage kV

12. Rated primary voltage of Electro-

Magnetic unit. kV

13. Insulation withstand test voltages for kV

Electromagnetic unit



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GUARANTEED TECHNICAL PARTICULARS FOR COMPOSITE

HOLLOW INSULATOR (Part-2)

( To be submitted with the tender)

Sr.

No.

Description Unit Guaranteed

Value

1 Highest System Voltage KV

2 Manufacturer of composite hollow insulator

3 Manufacturer of electrical equipment utilizing

composite hollow insulator

4 Overall length of unit from flange face to face

of end fitting mm

5 Applicable standard

6 Material of tube of insulator

7 Diameter of tube mm

8 Material of housing

9 Thickness of housing mm

10 Housing profile

a) Shed overhang

b) Shed thickness

c) Shed spacing

d) Shed inclination

e) Shed repetition

11 Damage limit of the composite insulator

under mechanical stress

N

12 Specified mechanical load (SML) N

13 Maximum mechanical load (MML) N

14 Type test SML bending load N

15 Deflection under bending load mm

16 Failing Load N

17 Residual deflection

18 Specified internal pressure (SIP) MPa



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Sr.

No.

Description Unit Guaranteed

Value

19 Maximum service pressure (MSP) MPa

20 Routine test pressure MPa

21 Damage limit of the composite hollow

insulator when pressure applied to insulator

MPa

22 Type test pressure MPa

23 Specified temperature ◦C

24 Eccentricity (e) mm

25 Parallelism (p) mm

26 Coaxiality mm

27 Concentricity mm

28 a) Power frequency external flashover

voltage (Dry) (Uref)

b) Power frequency flashover voltage (Wet)

KV

KV

29 Steep-front impulse high voltage

(Positive/ Negative)

KV/µs

30 Dry power frequency voltage KV

for 30

min

31 Power frequency punctures voltage KV

32 Visible discharge voltage KV



Page 22 of 23

SCHEDULE-B

‘Technical documents /Type test reports submitted’

( To Be filled up by Bidder & to be submitted with tender)

Sr.No. Particulars YES NO Remarks

1 Certificate of OEM attached

2 Fresh certificate of chartered

Engineer indicating manufacturing

capacity submitted

3 List of order with details of Qty,

value of the Order and Order No.

Compulsory with date (Executed

during last 5 years)

a) For same rated equipment supplied

to GETCO

b) For higher rated equipment than

offered to GETCO

c) Same rated equipment supplied to

other utility with performance

certificate

4 All Type Tests report for CVT and

Type tests report including Design

tests report, Sample tests report and

Routine tests report submitted are as

per list given in TS & not more than 5

years old.

5 List of performance certificate along

with copy of performance certificate

submitted.

6 Set of drawings as per the list given

in TS along with the CD of Soft copy

submitted.



Page 23 of 23

Sr.No. Particulars YES NO Remarks

7 Copy of the technical specification

submitted with the seal of OEM &

sign of CE

8 QAP Submitted for Offered

equipment

9 GTP Provided as per Schedule-A

10 In case of oil leakage during

guarantee period supplier shall

attend the same free of cost & if

require supplier shall have to take

the CVT to works at his cost. (To

be confirmed by bidder)

11 Your offer fully complies to meet

all the requirements as per TS &

documents to be submitted as

above.

I ____________________________, the authorized signatory here by

confirmed that the details pertain to Sr. No. 1 to 11 of Schedule-B

submitted herewith the tender is correct in all respect and as per

corporation’s requirements. If any detail there in found incorrect or

inadequate/insufficient by corporation then decision of corporation will be

acceptable to us without any further clarification.

Signature of Authorized representative of Company

NAME: _______________________

STATUS: ______________________

Documents

TECHNICAL SPECIFICATIONS FOR 220KV, 4400Pf … Office/0...The Composite hollow insulators for CVTs shall confirm to IEC 61462-2007-02. This composite hollow insulator shall consist