TECHNICAL SPECIFICATIONS FOR 400KV, 8800PF … Office...2. The bidder shall submit Quality Assurance...

GETCO/E/TS-400KV LINE CVT with CHI 0801A/R0, Feb 16

Sign & Seal of Bidder

Page 1 of 40

GUJARAT ENERGY TRANSMISSION

CORPORATION LTD.

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

TECHNICAL SPECIFICATIONS

FOR

400KV, 8800PF LINE CVT WITH COMPOSITE

HOLLOW INSULATOR

GETCO/E/TS-400KV LINE CVT with CHI 0801A/R0 Feb 16



Page 2 of 40

CONTENTS

CLAUSE

NO.

TITLE PAGE NO.

(A) Special Instruction to Bidder 3

(B) Qualifying requirement Data 4

1.0 Scope 5

2.0 Standards 5 & 6

3.0 Climatic Conditions 7

4.0 Principal Parameters 7,8 & 9

5.0 General Technical Requirements 9 to 20

6.0 A Prequalification Requirements

(PQR)

21

6.0 B Tests 21 & 22

7.0 Inspection 22 & 23

8.0 Quality Assurance Plan 23 & 24

9.0 Documentation 24,25 & 26

10.0 Packing and Forwarding 26 & 27

11.0 Quantity and Delivery

Requirements

27

Annexure I. System Particulars 28

Annexure II. Core wise details of Instrument

Transformer

29

Annexure III List of Additional Tests 30

Schedule - A Guaranteed Technical Particulars 31 & 32

Schedule - B ‘Technical documents /Type test reports

submitted’

33 & 34

Schedule - C SCHEDULE OF REQUIREMENT 35

(This document is meant for exclusive purpose of bidding against this

specification and shall not be transferred, reproduced or otherwise used

for purposes other than that for which it is specifically issued).



Page 3 of 40

(A) 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).



Page 4 of 40

(B) 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.



Page 5 of 40

1.0 SCOPE:

1.1 This specification provides for design, engineering, manufacture, stage

testing, inspection and testing before dispatch, packing and delivery at

destination of outdoor instrument transformers along with all accessories

specified herein for protection and metering services in different 400kV

sub stations in the state.

1.2 It is not the intent to specify completely herein all details of the design and

construction of equipments. However, the equipment shall conform in all

respects to high standards of engineering, design and workmanship and

shall be capable of performing in continuous commercial operation up to

the Bidder‟s guarantee acceptable to the Purchased, who will interpret in a

manner the meanings of drawings and specification and shall have the

power to reject any work or material which in his judgment is not in

accordance therewith. The equipment offered shall be complete with all

components necessary for it effective and trouble free operation. Such

components shall be deemed to be within the scope of Bidder‟s supply,

irrespective of whether these are specifically brought out in this

specification and/or the commercial order or not.

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.

2.0 STANDARDS:

2.1 Unless otherwise specified elsewhere in this specification, the rating as

well as performance and testing of the instrument transformers shall

conform but not limited to the latest revisions and amendments available

at the time of placement of order of all the relevant standards as listed

hereunder.



Page 6 of 40

2.1.1 CAPACITOR VOLTAGE TRANSFORMERS:

Sr. No. Standard No. Title

1. IS:3156 (Part-V) Capacitor voltage transformer

2. IS:2071 Method of high voltage testing

3. IS:335 Insulating oil for transformers and

switchgears

4. IS:2165 Insulating co-ordination for equipments

of 100KV and above.

5. IS:2147 Degree of protection provided by

enclosures for low voltage switchgear and

control.

6. IEC-186 Voltage Transformers

7. IEC-186A Partial supplement to IEC publication 186

8. IEC-270 Partial discharge measurement

9. IEC-44(4) Instrument transformer measurement of

PDs.

10. IEC-171 Insulation co-ordination

11. IEC-358 Coupling capacitor divider

12. IEC-60 High voltage testing techniques

13. IEC-8263 Method for RIV test on high voltage

insulators

14. IS:9348 Coupling capacitors and capacitor

dividers

15. ……… Indian Electricity Rules 1956

16. IS:556L Terminal Connector

17. IEC : 60044-5 Capacitor Voltage transformer

18. IEC : 61869-1 Instrument transformer- Part 1: General

requirements

19. IEC: 61462 Composite Hollow Insulators

2.2 Equipment meeting with the requirement of other authoritative Standards,

which ensure equal or better performance that the standards mentioned

above, shall also be considered. When the equipments offered by the

Bidder conforms to other standards, salient points of difference between

standard adopted and the standards specified in this specification shall be

clearly brought out in the relevant schedule. Four copies of such standards

with authentic translation in English shall be furnished along with the

offer.



Page 7 of 40

3.0 CLIMATIC CONDITIONS:

3.1 Equipment to be supplied against this specification shall be suitable for

satisfactory continuous operation under the following tropical conditions:

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

NOTE: Moderately hot and humid tropical climate conducive to rust and

fungus growth. The climatic conditions are also prone to wide variations

in ambient conditions. Smoke is also present in the atmosphere. Heavy

lightning also occurs during June to October.

4.0 PRINCIPAL PARAMETERS:

4.1 The Capacitor voltage transformers covered in this specification

shall meet the technical requirements listed hereunder.

4.2.1 PRINCIPAL TECHNICAL PARAMETERS OF

CAPACITOR VOLTAGE TRANSFORMERS:

Sr.

No.

ITEM SPECIFICATION 400 KV

1. Type of CVT Installation Single Phase, Oil filled

hermetically sealed/outdoor

stainless steel bellow type.

2. Type of mounting ← Pedestal Type →

3. Suitable for system Frequency ← 50 Hz →



Page 8 of 40

Sr.

No.


4. Highest System Voltage(KVrms) 420

5. Voltage Ratio

(i) Rated Primary Voltage (KV rms) 400/√3

(ii) Secondary Voltage (Volt) Core-I Core-II Core-III

110/√3

110/√3

110/√3

6. Method of earthing the system to

be connected to

Effective earthed

7. 1.2/50 Microsecond lightning

impulse withstand voltage (KVp)

1425

8. 250/2500 Microsecond lightning

impulse withstand voltage (KVp)

(Dry & Wet)

1050

9. 1 minute dry power frequency

withstand voltage primary (KV

rms)

630

10. Min. creepage distance of

porcelain house in (mm)

10500

11. Rated voltage factor 1.5 for 30 seconds

12. Rated total capacitance (PF) 8800 + 10% - 5%

13. Acceptable limit of variation of

total capacitance over the entire

carrier frequency range

+ 50% and – 20% of the

rated capacitance.

14. Equivalent series resistance over

the entire carrier frequency range

(ohms)

Less than 40

15. Stray capacitance and stray

conductance of low voltage

terminal over the entire carrier

frequency range.

As per IEC 358

16. Standard reference range of

frequency for which assurances are

valid

97% to 103% for protection

99% to 101% for metering

17. 1 minute power frequency

withstand voltage:

(i) Low voltage terminal (HF)

and earth terminal (KV rms)

4 if the low voltage terminal

is exposed to weather

(ii) Withstand voltage for

secondary winding (KV rms)

2



Page 9 of 40

Sr.

No.


18. Maximum radio interference

voltage at 1 MHZ and 1.1 times

maximum phase to ground

voltage

1000 micro Volts

19. Visual corona extinction

voltage (KV rms)

320

20. Partial discharge level at rated

voltage for capacitance divider

(Pico Coulombs)

Less than 10

21. Maximum temperature rise over

ambient of 50°C

As per IEC 186

22. Rated total thermal burden 500 VA

23. No. of terminals in control

cabinet

All contacts and control circuit

to be wired up to control cabinet

plus 6 terminals exclusively for

purchaser‟s use.

24. Seismic acceleration

(Horizontal)

0.08 X 2g.

5.0 GENERAL TECHNICAL REQUIREMENTS:

5.1 For Capacitor Voltage Transformers:

5.1.1 The insulation of the capacitor voltage transformers shall be so

designed that the internal insulation shall have higher electrical

withstand capability than the external insulation. The designed

dielectric withstands values of external and internal insulations

shall be clearly brought out in the guaranteed technical particulars.

The dielectric withstand values specified in this specification are

meant for fully assembled capacitor voltage transformers.

5.1.2 Composite Hollow Insulator:

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



Page 10 of 40

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 tropical conditions described under 3.0

above, with high temperature, humidity and rainfall.

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 1500 N in any direction when applied to

primary terminal.

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.



Page 11 of 40

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



Page 12 of 40

Type test pressure = 4.0 x MSP Irreversible plastic phase

Specified internal pressure

(SIP)

≥ 4.0 x MSP Irreversible plastic phase

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.

5.1.3 The metal tanks shall have bare minimum number of welded joints

so as to minimize possible locations of oil leakage. The metal tanks

shall be made out of mild steel/stainless steel/aluminium alloy,

depending on the requirement. Welding in horizontal plane is to be

avoided as welding at this location may give way due to vibrations

during transport resulting in oil leakage. Supplier has to obtain

specific approval from purchaser for any horizontal welding used in

the bottom tank.

5.1.4 Cleaning and Painting:

5.1.4.1 All ferrous parts of CVTs including lifting hooks shall be

painted. Before painting or filling with oil or compound all

nongalvanised parts shall be completely cleaned and free

from dust scale and greases. All external rough surfaces on



Page 13 of 40

castings shall be filled by metal disposition. The interior of

voltage transformer tank shall be cleaned of all scale and rust

by sandblasting or other approved method. These surfaces

shall be painted with oil resisting varnish or paint.

5.1.4.2 Except for nuts, bolts of washer all external surfaces shall

received a minimum of three coats of paint. The primary coat

shall be applied immediately after cleaning. The second coat shall

be of oil paint of weather resisting nature.

The final coat shall be of glossy oil and weather resisting

Non-feeding paint.

5.1.4.3 All internal surfaces except those which have received

anticorrosion treatment shall received three coats of paints

applied to the thoroughly cleaned metal surface. The final coat

shall be of light colored anti condensation mixture. Any damage

to painting during transport and erection shall be made good by

thoroughly cleaning the damaged portion and by applying the full

number of coats of paints.

5.1.5 Insulating Oil:

5.1.5.1 The quantity of insulating oil for the first filling and the complete

specification of the oil shall be stated in tender. The oil shall

comply in all respects with the provisions of the latest edition of

IS: 335 or IEC Publication No. 296 (as amended up to date). The

oil shall have the following main characteristics for equivalent.

(The requirement indicated is determined in accordance with the

test methods adopted by IS: 335).

Sr. No. Characteristics Requirements Method of Test

1 Appearance The oil shall clear

& transparent &

free from

suspended matter

or sediment.

A representative sample of

oil shall be examined in

100mm thick layer, at

ambient temperature of

equivalent authoritative

standards.

2. Density at 27°C

Max

0-89g/Cm3

IS: 1448(P-16) 1967 or

equivalent Authoritative

standard.



Page 14 of 40

Sr.

No.

Characteristics Requirements Method of Test

3. Kinematics viscosity

at 27°C Max

27 CST IS: 1448(P-16) 1960 or


standard.

4. Interfacial tension at

27°C Max

0.04 N/m IS: 6104 - 1971 or


standard.

5. Flash point pensky

marten (closed) Min.

140°C IS: 1448 (P-10) - 1970

or equivalent

Authoritative standard.

6. Pour point Max. - 10 °C IS: 144 (P-10) 1970 or


standard.

7. Neutralization value

(Total acidity) max.

0.03mG/KOH/g IS: 355 1972, Appendix-

A or equivalent


8. Corrosive sulphor (in

terms of classification

of copper strip)

Non-corrosive IS: 355 1972, Appendix-

B or equivalent


9. Electric strength

(break-down voltage

Min.

a) New untreated

oil.

b) After treatment

30KV (rms). If the

above value is not

attained, the oil

shall be treated.

50 KV (rms).

IS: 6792 – 1972 or


standard.

10. Dielectric dissipation

factor (tan delta) at

90°C Max.

0.002 IS: 335 – 1983 or


standard.

11. Specific resistance

(resistivity)

(a) At 90°C Min

(b) At 27°C

Min

35x1012

Ohm-cm

1500 x 1012

Ohm-

cm

IS: 6103 – 1971 or


standard.



Page 15 of 40

Sr.

No.

Characteristics Requirements Method of Test

12. Oxidation stability

a) Neutralization

Value after

Oxidation Max.

b) Total sludge

After oxidation

Max.

0.40mg/KOH/g.

0.10 percent by

weight.

IS: 335 – 1972

Appendix-C, or


standard.

13. Ageing

characteristic after

accelerated aging

a) Specific

resistance

(Resistivity)

i) At 27°C Min.

ii) At 90°C Min.

b) Dielectric

dissipation

factor (tan

delta) at 90°C

Max

c) Total slug

acidity Max. %

by weight

d) Total slug

Value Max. %

by weight

2.5 X 1012

ohm-cm.

0.2 x 1012

ohm-cm.

0.2

0.05

0.05

IS: 335 – 1983

IS: 335 – 1983

IS: 335 – 1983

14. Water content max. 50 ppm. IS: 335 – 1983 or


standard.

5.1.6 Surface Finish:

5.1.6.1 The metal tanks shall be coated with at least two coats of

zinc rich epoxy painting. All the ferrous hardware, exposed



Page 16 of 40

to atmosphere, shall be hot dip galvanized. All other fixing

nuts, bolts, washers shall be made out of stainless steel.

5.1.7 Insulating Oil:

5.1.7.1 Insulating oil required for first filling of the capacitor

voltage transformer shall be covered in Bidder‟s

scope of supply. The oil shall meet the requirements

of latest edition of IS: 335.

5.1.8 Prevention of Oil Leakages and Entry of Moisture:

5.1.8.1 The supplier shall ensure that the sealing of capacitor

voltage transformer is properly achieved. In this

connection the arrangement provided by the supplier

at various locations including the following ones

shall be described, supported by sectional drawings.

i) Locations of emergence of primary and

secondary terminals.

ii) Interface between housing of composite

insulator and metal tank.

iii) Cover of the secondary terminal box (IP-55

Class).

5.1.8.2 Nuts and bolts used for fixation of the interfacing

composite hollow insulator for taking out terminals

shall be provided on flanges cemented to the insulator

and not on the insulator.

5.1.8.3 For gasket joints, wherever used nitrite butyl rubber

gaskets shall be used. The gasket shall be fitted in

properly machined groove with adequate space for

accommodating the gasket under compression.

5.1.9 Oil Level Indicators:

5.1.9.1 Capacitor voltage transformers shall be supplied with

stainless-steel bellow to take care of increase/decrease

in volume of oil due to temperature variation. A glass



Page 17 of 40

window shall be provided to monitor the position of

stainless-steel bellow.

5.1.10 Earthing:

5.1.10.1 Metal tank of the capacitor voltage transformer shall

be provided with two separate earthing terminals for

bolted connection to 50 x 8 mm MS flat to be

provided by Purchaser for connection to station earth-

mat.

5.1.11 Capacitor voltage transformer shall be provided with suitable

lifting arrangement to lift the entire unit. The lifting arrangement

shall be clearly shown in the general arrangement drawing. Lifting

arrangement (lifting eye) shall be positioned in such a way as to

avoid any damage to the porcelain housing or the tanks during

lifting for installation/transport. Necessary string guides shall be

offered which shall be of removable type.

5.1.12 Name Plate:

5.1.12.1 The capacitor voltage transformer shall be provided

with non-corrosive, legible name plate with the

information specified in relevant standards, duly

engraved/punched on it.

5.1.13 Terminal Connector:

5.1.13.1 The terminal connectors required for connection of the

capacitor voltage transformer to Purchaser bus bar

shall be in supplier‟s scope. In the case of twin

conductor the TC shall be suitable for both vertical and

horizontal take off. TC for IPS tube shall be of

expansion type and suitable for horizontal take off.

Exact distribution according to type of TC shall be

communicated to the successful Bidder. TC preferably

shall be compression/bolt less type.

5.1.13.2 The terminal connectors shall meet the following

requirements:

1) Terminal connectors shall be manufactured and

tested as per IS: 5561.



Page 18 of 40

2) All castings shall be free from bow holes, surface

blisters, cracks and cavities. All sharp edges and

corners shall be blurred and rounded off.

3) No part of a clamp shall be less than 10 mm thick.

4) All ferrous parts shall be hot dip galvanized

conforming to IS: 2633.

5) For bimetallic connectors, copper alloy liner of

minimum thickness of 2 mm shall be cast integral with

aluminium body.

6) Flexible connectors shall be made from tinned

copper/aluminium sheets.

7) All current carrying parts shall be designed and

manufactured to have minimum contact resistance.

8) Connectors shall be designed to be corona free in

accordance with the requirements stipulated in IS:

5561.

5.1.14 Enamel, if used for conductor insulation, shall be either polyvinyl

acetate type or amide type and shall meet the requirements of IS:

4800. Polyester enamel shall not be used. Double cotton cover, if

used, shall be suitably covered to ensure that it does not come in

contact with oil.

5.1.15. The temperature rise on any part of equipment shall not exceed the

maximum temperature rise specified below under the conditions

specified in test clauses. The permissible temperature rise indicated

is for a maximum ambient temperature of 50°C.

Sr.

No.

Nature of the Part or of the Liquid Temp.

(°C)

Temp. Rise at a max.

Ambient air not

exceeding 50°C

1. Contacts in air, silver faced copper,

copper alloy or aluminium alloy (see

noted (i) and (ii)

105 55

Bare Copper or tinned aluminium alloy 75 25

2. Contacts in oil:

Silver faced copper, copper alloy or

aluminium alloy (see note (ii))

90 40

Bare Copper or tinned aluminium alloy 80 30



Page 19 of 40

Sr.

No.

Nature of the Part or of the Liquid Temp.

(°C)

Temp. Rise at a

max. Ambient air

not exceeding 50°C

3. Terminal to be connected to external

conductors by screw or bolts silver

faced (see note (iii))

105 55

Bare 90 40

4. Metal parts acting as springs (See

note iv)

(See note iv)

5. Metal parts in contact with insulation

of the following classes:

Class Y: For non impregnated

materials

90 40

Class A: For materials immersed in oil

or impregnated

100 50

Class E: In Air 120 70

In Oil 100 50

Class B: In Air 130 80

In Oil 100 50

Class F: In Air 155 105

In Oil 100 50

Enamel: Oil base 100 50

Synthetic, in Air 120 70

Synthetic, in Oil 100 50

6. Any part of metal or of insulating

material in contact with oil, except

contacts

100 50

7. Oil 90 40

Notes: i) When apply the temperature rise of 55°C, care should be taken to

ensure that no damage is caused to the surrounding insulating

materials.

ii) The quality of the silver facing shall be such that a layer of

silver remains at the point of contact after the mechanical

endurance test. Otherwise, the contacts shall be regarded as “bare”.

iii) The values of temperature and temperature rise are valid whether or

not the conductor connected to the terminals is silver faced.

iv) The temperature shall not reach a value where the elasticity of

the material is impaired. For pure copper, this implies a

temperature limit of 75°C.



Page 20 of 40

5.2 CAPACITOR VOLTAGE TRANSFORMER (CVT) DESIGN:

5.2.1 The CVT is required for protection, metering, telemetering and

telecontrol purposes.

5.2.2 The capacitor voltage divider of the CVT shall be mounted in

shaded, oil filled Composite Hollow Insulator. The electro-

magnetic unit consisting of compensating reactor, intermediate

transformer, protective and damping devices etc., shall be

mounted in a hermetically sealed metal enclosure, which shall

also be used us a mechanical support for the capacitor voltage

divider. The terminals of the secondary winding of the

electromagnetic units shall be brought out in a separate, weather

proof terminal box, which shall be properly mounted on the

wall of the metal of the electromagnetic unit. The terminal box

shall be dust and vermin proof. Suitable arrangement shall be

provided for drying of air inside the terminal box.

5.2.3 The capacitor voltage divider shall be capable of being used

over a wide carrier frequency bandwidth. The value of

capacitance shall be suitably chosen for reliable wide band

carrier coupling and shall be as per the values indicated in

clause 4.0. The reactance of the teed branch of the CVT shall be

adjusted to minimize carrier loss. With carrier frequency

coupling device connected to the earth lead of the intermediate

coupling device connected to the earth lead of the intermediate

coupling capacitor, the accuracy of the electromagnetic voltage

transformer unit shall remain within the specified limits.

5.2.4 Volumetric variations of the insulating oil inside the capacitor

voltage divider unit shall be suitably compensated. The

arrangement provided for this purpose shall be clearly described

in the tender bid. Each unit of the capacitor voltage divider shall

be hermetically sealed.

5.2.5 The oil volume variation in metal enclosure of the

electromagnetic unit shall be counter balanced by a suitably

dimensioned gas cushion.



Page 21 of 40

5.2.6 Electromagnetic Unit:

5.2.6.1 The primary winding shall be of suitably insulated

electrolytic copper wire. Type of insulation used shall be

described in the offer. A carrier frequency choke shall be

provided in the series with the primary winding to prevent

the loss of signal.

5.2.6.2 Suitably insulated copper wire of electrolytic grade shall be

used for secondary windings. Type of insulation used shall be

described in the offer. Each core of secondary winding shall

be protected by two sets of HRC fuses, in parallel.

5.2.6.3 The secondary terminals shall be brought out in a

weatherproof terminal box. The HRC fuses meant for

protection of secondary windings shall also be located in the

terminal box. 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 mm to

10 mm stranded copper or aluminium conductor cable. The

size of the terminal box and its openings shall be adequate to

enable easy access and sufficient working space for use of

normal tools. Polarity shall be indelibly marked on each of

the secondary terminals in the terminal box.

5.2.6.4 Secondary Terminals:

5.2.6.4.1 Secondary winding terminal studs shall be

provided with at least three nuts, plain and spring

washers. The studs, nuts and washers shall tinned

copper of 99.9% purity and conductivity. The

minimum outside diameter of the studs shall be 6

mm. The length of at least 20 mm shall be

available on the studs for inserting the leads

.

5.2.7 The CVT shall be provided with a rating plate with

dimensions and marking as per IS: 3156 (part-iv). The

making shall be punched and not painted.



Page 22 of 40

6.0 TESTS:

6.1 Type Tests:

All CVTS‟ offered shall be fully type tested as per relevant standards

(latest edition) as specified at the NABL accredited Laboratory.

6.1.1 The Bidder shall have to submit following Type test reports with the

tender bid.

LIST OF TYPE TEST REPORTS FOR 400KV, 8800PF CVT:

1. Temperature rise test on EMU

2. Lightning impulse voltage withstand test

3. Switching impulse withstand voltage test (Wet)

4. Chopped impulse withstand voltage test (Wet)

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

6. Capacitance & dielectric dissipation factor measurement before and

after HV test

7. Capacitance & dielectric dissipation factor measurement (Before &

After SC)

8. Partial discharge test (Before & After SC)

9. Ferro resonance test (Before & After SC)

10. Short circuit withstand capability test

11. Transient response test

12. High frequency capacitance & equivalent series resistance test

13. Test for determination of Temperature coefficient (For Model

Capacitor to be used for offered CVT)

14. RIV

15. Visual corona

16. Accuracy Test (Before & After SC)

17. Discharge test

18. Measurement of stray capacitance & stray conductance

19. IP55 test on secondary terminal Box.

20. Tightness test on EMU

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

22. Verification of terminal marking

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



Page 23 of 40

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

25. Seismic & Mechanical withstand test (Special Test)

6.1.2 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.

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

6.2 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.

6.2.1 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)



Page 24 of 40

6.2.2 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)




6.2.3 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)

6.2.4 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.

However, the purchaser reserves the right to demand repetition of some or all

the type tests in the presence of purchaser‟s representative. For this, the bidder

may quote unit rates for carrying out each type tests. This will not be

considered for evaluation.



Page 25 of 40

6.3 ACCEPTANCE AND ROUTINE TESTS:

6.3.1 All acceptance and routine tests as stipulated here under shall be

carried out by the bidder in presence of purchser‟s representative.

6.3.1.1 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

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

6.3.1.2 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



Page 26 of 40

a. Measurement of the spark-over voltage with power

frequency (Air-gap arrester)

b. AC test with the continuous rated withstand voltage

6.3.1.3 ACCEPTANCE TESTING REQUIREMENT FOR CVT :

All the tests mentioned at 6.3.1.1 & 6.3.1.2 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.

6.3.2 Immediately after finalization of the program of type/acceptance/routine

testing, the supplier shall give sufficient advance intimation to the

Purchaser to enable him to depute his representative for witnessing the

tests.

6.3.3 Three (3) sets of certified copies of acceptance/routine tests reports and

oscillograms shall be submitted to the purchaser for approval before

dispatch.

6.3.4 The purchaser and/or authorized Consulting Engineer reserves the right

to witness any/or all tests. The purchaser will have the right to get any

other test(s) of reasonable nature, carried out at his own expense at

manufacturer‟s works or at site or at any other place in addition to the

routine tests, to confirm that the material/items complies with the

requirement of specification.

6.3.5 All tests on galvanized components shall be conducted according to the

latest edition of IS – 2633 (as amended up-to-date) or any other

equivalent authentic standards.

7.0 INSPECTION:

i) The purchaser shall have access at all times to the works and all other

places of manufacture, where the instrument transformers are being

manufactured and the supplier shall provide purchaser representative

all facilities for unrestricted inspection of the works, raw materials,

manufacture of all the accessories and for conducting necessary testes

as detailed herein.

ii) The successful Bidder shall keep the purchaser informed in advance

of the time of starting and of the progress of manufacture of



Page 27 of 40

equipment in its various stages so that arrangements could be made

for inspection.

iii) No material shall be dispatched from its point of manufacture unless

the material has been satisfactorily inspected and tested.

iv) The acceptance of any quantity of the equipments shall in no way

relieve the successful Bidder of his responsibility for meeting all the

requirements of this specification and shall not prevent subsequent

rejection if such equipments are later found to be defective.

8.0 QUALITY ASSURANCE PLAN:

8.1 The Bidder shall invariably furnish following information along with his

offer. Information shall be separately given for individual type of equipment

offered.

i) Statement giving list of important raw materials, names of sub

suppliers for the raw material, list of standards according to which the

raw material in presence of Bidder‟s representative, copies of test

certificates.

ii) Information and copies of test certificates as in (1) above in respect of

bought out items.

iii) List of manufacturing facilities available.

iv) Level of automation achieved and list of areas where manual

processing exists.

v) List of area in manufacturing process, where stage inspections are

normally carried out for quality control and details of such tests and

inspections.

vi) Special features provided in the equipment to make it maintenance

free.

vii) List of testing equipment available with the Bidder for final testing of

equipment specified and test plant limitation, if any, vis-à-vis type,

special, acceptance and routine tests specified in the relevant

standards. These limitations shall be very clearly brought out in

schedule of deviations for specified test equipments.

8.2 The successful Bidder shall within 30 days of placement of order, submit

following information to the Purchaser.

i) List of raw material as well as bought out accessories and the names

of sub suppliers selected from the lists furnished along with offer.



Page 28 of 40

ii) Type test certificates of the raw material and bought out accessories.

iii) Quality Assurance Plan (QAP) with hold points for purchaser‟s

inspections. The quality assurances plan and hold points shall be

discussed between the Purchaser and Supplier before the QAP is

finalized.

8.3 The successful Bidder shall submit the routine test certificates of bought out

items and of raw material at the time of routine testing of the fully

assembled equipment.

9.0 DOCUMENTATION:

9.1. All drawings shall conform to international standards Specification (ISO)

„A‟ series of drawing sheet/Indian Standards Specification ISI 1065. All

drawings shall be in ink and suitable for microfilming. All dimensions and

data shall be in S.I. Units.

9.2 List of Drawings and Documents:

The Bidder shall furnish four sets of following drawings along with his offer

& CD for soft copy of all followings drawings.

a) General outline and assembly drawings of the equipment.

b) Sectional views showing:

i) General Constructional Features.

ii) Materials/Gaskets/Sealing used.

iii) The insulation of the winding arrangements, method of

connection of the primary/secondary winding to the

primary/secondary terminals etc.

iv) Composite hollow insulator used and its dimensions along with

the mechanical and electrical characteristics.

c) Secondary terminal Box having separate sealable compartment with

locking arrangement for metering core having class of accuracy 0.2

and with arrangement of terminals and details of connection studs

provided.

d) Rating & Diagram Plate for 400KV, 8800PF CVT.

e) Terminal connectors for specification as per Clause 5.1.13.1

f) Schematic drawing.

g) Type test reports in case the equipment has already been type tested.

h) Test reports, literature, Pamphlets of the bought out items and raw

material.



Page 29 of 40

9.3 The successful Bidder shall within 2 weeks of placement of order, submit

three sets of final versions of all the above drawings for Purchaser‟s

approval. The Purchaser shall communicate his comments/approval on the

drawings to the supplier within reasonable time. The supplier shall, if

necessary, modify the drawings and resubmit three copies of the modified

drawings for purchaser‟s approval within two weeks from the date of

purchaser‟s comments. After receipt of purchaser‟s approval, the supplier

shall within three weeks, submit in soft scan copy of approved drawings

9.4 The type test reports shall be submitted by the purchaser, before

commencement of supply. Adequate copies of acceptance and routine test

certificates, duly approved by the purchaser shall accompany the dispatched

consignment.

9.5 The manufacturing of the equipment shall be strictly in accordance with the

approved drawings and no deviation shall be permitted without the written

approval of the Purchaser. All manufacturing and fabrication work in

connection with the equipment prior to the approval of the drawing shall be

at the supplier‟s risk.

9.6 Twenty (20) copies of nicely printed and bound volumes of operation,

maintenance and erection manuals in English language, for each type and

rating of equipment supplied shall be submitted by the Supplier for

distribution, prior to the dispatch of the equipment. The manual shall contain

all the drawings and information required for erection, operation and

maintenance of the instrument transformer. The manual shall also contain a

set of all the approved drawings, type test reports etc.

9.7 Approval of drawings/work by Purchaser shall not relieve the supplier of his

responsibility and liability for ensuring correctness and correct interpretation

of the latest revision of applicable standards, rules and codes of practices.

The equipment shall confirm in all respects to high standards of engineering,

design, workmanship and latest revisions of relevant standards at the time of

ordering and purchaser shall have the power to reject any work or material

which in his judgment is not in full accordance therewith.



Page 30 of 40

10.0 PACKING AND FORWARDING:

10.1 The equipment shall be packed in MS painted crates suitable

vertical/horizontal transport, as the case may be and suitable to withstand

handling during transport and outdoor storage during transit. The supplier

shall be responsible for any damage to the equipment during transit, due to

improper and inadequate packing and handling. The easily damageable

material shall be carefully packed and marked with the appropriate caution

symbols. Wherever necessary, proper arrangement for lifting such as lifting

hooks etc., shall be provided. Any material found short inside the packing

cases shall be supplied by supplier without any extra cost.

10.2 Each consignment shall be accompanied by a detailed packing list

containing the following information:

a) Name of the consignee.

b) Details of consignment.

c) Destination.

d) Total weight of consignment.

e) Handling and unpacking instructions.

f) Bill of material indicating contents of each package.

10.3 The Supplier shall ensure that the packing list and bill of material are

approved by the purchaser before dispatch.

11.0 QUANTITY AND DELIVERY REQUIREMENTS:

i) Quantity and delivery requirement is set out in the schedule of

requirements.

ii) The scope of supply shall include a supply of 2.5% extra quantity of

bolts, nuts, washers, split pins, cotter pins and such other small loose

Items free of cost.

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

per Schedule-A (GTP) & details of „Technical documents /Type test reports

submitted‟ as per Schedule-B.

The GTP submitted by the bidder in the offer if found to be not provided as per the

Schedule-A & if any of the type test reports 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



Page 31 of 40

rejected without any prior confirmation. Also if any of the type test reports from

the list given above not submitted then it shall be indicated clearly by the bidder in

the schedule of deviation.

12.0 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.



Page 32 of 40

ANNEXURE – I

400KV CAPACITOR VOLTAGE

TRANSFORMERS

SYSTEM PARTICULARS

(A) Electrical System Data

a) System Voltage (KV rms)

400

b) Max. Voltage (KV rms)

420

c) Lighting impulse withstand voltage (dry & wet)

(Kvp)

1425

d) Power Frequency withstand voltage (wet) (Kvp)

630

e) Switching surge withstand voltage (wet) (Kvp) 1050

f) Min. Corona extinction voltage at 50Hz A.C.

system dry Condition (KV rms)

320

g) Radio interference voltage at one MHZ for phase

to earth voltage.

1000

h) Short Circuit level (KA) for 3 sec.

40



Page 33 of 40

ANNEXURE – II

400KV CAPACITOR VOLTAGE TRANSFORMERS

COREWISE DETAILS OF CAPACITOR

VOLTAGE TRANSFORMERS

REQIREMENT OF 400KV (CVT) Sr.

No.

Particulars Requirement

1. Rated primary voltage

400/ √3 kV

2. Type

Single Phase capacitor VT

3.

No. of secondary 3

4.

Rated voltage factor 1.1 continuous

1.5 – 30 seconds

5.

Phase angle error +/- 20 Minutes for metering

6. Capacitance (Minimum) in

pico farads (Pf);

8800. + 10%, - 5%

Sec. – I, Sec. – II, Sec. - III

7.

Rated Voltage (volt) 110/√3 110/√3 110/√3

8.

Application Prot. Prot. Metering.

9.

Accuracy 3P 3P 0.2

10.

Output burden (VA) 50 50 100

Note: The accuracy of 0.2 on winding III should be maintained up

to and including total burden of 100 VA on all three

windings for 400 KV line CVTs has been specified. The

pass band of PLCC frequency shall be from 48 KHZ to 500

KHZ.



Page 34 of 40

ANNEXURE – III

400KV CVT

LIST OF ADDITIONAL TESTS TO BE CARRIED OUT

Sr.

No.

Name of the Test Standard to

which it

conforms

(A) CAPACITOR VOLTAGE TRANSFORMER:

I. ADDITIONAL TEST TO BE CARRIED OUT

AS TYPE TESTS

1. Impulse withstand voltage test:

The test shall be performed in dry condition with

voltage of positive polarity only and repeated in

WET condition with voltage of both the positive

and negative polarity. The test shall be performed

in dry condition with voltage of positive polarity,

using the standard 1.2/50 microsecond switching

impulse wave. The voltage applied during the test

shall be 1050 KV (Peak). 15 consecutive impulses

shall be applied to the line terminal with the base

of the CVT earthed. The CVT shall be considered

to have passed the test successfully if no internal

discharge occurs and if the numbers of discharge

Occurs on external insulation to earth does not

exceed two.

2. High frequency capacitance and equivalent series

resistance measurement.

IS:9348

3. Stray capacitance and stray conductance

measurement of low voltage terminal.

IS:9348

4. Determination of temperature co-efficient. IS:9348

5. Measurement of radio interference test. IS:8263

II. ADDITIONAL TESTS TO BE CARRIED OUT

AS ROUTINE TESTS:

1.

Capacitance and loss angle measurement before

and after high voltage test.

IS:9348

2. Partial discharge test on capacitor dividers. IS:9348

3.

Oil leakage test IS:9348



Page 35 of 40

(Schedule-A) (To be filled in by the Bidder) (Part-1)

GUARANTEED TECHNICAL PRTUCULARS FOR CVT (I) CAPACITOR VOLTAGE TRANSFORMERS 420 KV

1. Type / Installation

2. Manufacturer‟s Name and Country of Manufacture

3. Conforming to standard

4. Type of Voltage Transformer

5. Type of insulation used

6. Rated primary voltage (KV)

7. Rated secondary voltage (Volts) For For For

Wind- Wind- Wind-

ing ing ing

I II III

8. Rated transformer ratio -Do- -Do- -Do_

9. Rated secondary burden (VA) -Do- -Do- -Do_

9A Rated thermal burden (VA) -Do- -Do- -Do_

10. Accuracy at rated burden -Do- -Do- -Do_

11. Rated frequency Hz

12. Number of phases

13. Temp. rise of winding by resistance (°C)

14. Primary winding one minute power frequency

withstand voltage KV (rms)

15. Impulse withstand voltage 1.2/50 Microsecond full

wave positive and negative impulse withstand

voltage KV (Peak).

16. Switching impulse wet and dry withstand voltage

KV (Peak)

17. One minute power frequency withstand voltage of

secondary winding KV (rms)

18. Maximum dynamic P.F overvoltage KV (Peak)

19. Maximum radio interference voltage at 266 KV

rms (microvolt)

20. Corona inception and extinctions voltage (KV rms)

21. Capacitance (for CVT only) (P.F.)

22. Primary capacitance (C1) (PF)

23. Secondary (Intermediate ) capacitance (C2) (PF)

24. Intermediate tap voltage of EMU(Kv rms)



Page 36 of 40

(Schedule-A) (To be filled in by the Bidder) (Part-1)

GUARANTEED TECHNICAL PRTUCULARS FOR CVT (To be filled in by the Bidder Separately for each type and

Voltage rating)

(I) CAPACITOR VOLTAGE TRANSFORMERS 420 KV

25 Total creepage distance (mm) (Protected)

26. Overall hight (mm)

27. Total weight (kgs)

28. Type test reports (report no.)

29. Minimum recommended spacing between voltage

transformers.

30. Outline dimensions drawing number giving

clearance for installation (drg. No.)

31. Mounting flange dimensional details

Name of the firm:

____________________________

Signature of Bidder:

__________________________

Designation and Seal:

_________________________

Date:

__________________________



Page 37 of 40

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



Page 38 of 40

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 39 of 40

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 Test reports 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 40 of 40

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

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: ______________________

Date post:	06-Apr-2020
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