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Annexure- A to ScteaulJ-D (part-D

No. CSC-24/R -| I UHI DH I p &D I 2o2o-2t

Technical specification of

35 KV Vacuum Circuit Breaker

for 33 KV Sub-Stations

Common Specifications

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1. SCOPE:

1'1 This specification covers the design, manufacture, assembry, inspection and testingbefore despatch, packing & delivery F.O.R. destination of 36 KV outdoor type vacuumcircuit breaker comprete with a[ accessories incruding terminar connectors & supportingstructure required for satisfactory operation as per schedure of requirement (Annexure-

D.

1.2 lt is not the intent to specify compretery herein afl the detairs of design and constructionof 35 KV vacuum circuit breaker. However, 36 r(/ vcB shafl conform in arr respect tothe high standard of design and workmanship and be capable of performing in

continuous commerciar operation up to bidder's guarantee in a manner acceptabre toowner' who wirr interpret the meanings of drawings and specifications and shafl have

the pou,er to reject any work or material which in his judgment are not in accordance

therewith. The circuit breaker offered shaI be comprete with aI parts necessary for theireffective and troubre free operation. such components shafl be deemed to be \rvithin thescope of supply irrespective of whether they are specifically brought out in thecommercial order or not.

2. Standards:-

The 36 l(/ Vacuum circuit breaker sha[ conform to the ratest editions and amendments

available at the time of supply of the standards listed hereunder:

Sr.No.

Standardref. No. lss

Ti e lEc

I tss-'131 18 specification for h@breaker

IEC-56

2. rss-2071(PART-t)

Method of high volta@test equiprnent.

IEC-60-1

a lss-3716 Application guide to insulation co-ordinati; lEc-71-24. lss-2099 Bushing for alternating voltage 10oor/olis.- tEC-137

lss-4759 Hot-dip zinc coating on structuralsteEl and other alliedproducts.

6. tss-2633 Method for testing uniformity of coating-n zinE c6EiEI'articles.

7. lss-2147 Degree of protection provided by enclosure for lowvoltage switchgear and control.

a lndian electricity rules, 'l956

Equipment meeting with the requirement of other authoritative standards which ensure

equal or better quality than the standards mentioned above shall also be acceptable.

where the equipment offered by the bidder conforms to other standards, sarient points

3lJ*il

2.1

wect

UTTTB

i) Maximum temperature

ii) Minimumtemperature

iii) Relative humidity

a) Maximum

b) Minimum

iv) lsoceraunic level

v) Number of rainY daYs Per Year:

Nominal system voltage

Highest system voltage

No. of poles

FrequencY

lnterrupting caPacitY

Basic insulation level

Operating dutY

Total break time for anY

Current upto the rated breaking

Current.

Control circuit voltage

Continuous current rating at

Ambient temPerature of 500 C'

600c

-50C

95%

26%

45

120 daYs

33KV (rms)

36 K/ (rms)

50Hz 13%

1 500 l\ilvA.

170 KV (P)

75 K/ (rms)

O-0.3 sec-Co-3 min-CO

3 cycles max. (60 ms)

24 volts DC +10% lo -20%240 volts +10% to -20% for single-

ohase AC suPPlY.

its volts +10o/o lo -ZQo/o lor

3 phase AC suPPlY.

furnished alongwith the offer'

3.0 SERVICE CONDITION.

The equlpment's /material to be supplied against this speciflcation shall be suitable for

satisfactory oPeration under the following climatic conditions:-

vi) Average rainfall per annum 900 mm

vii) Max. altitude above mean sea level 1000 meters

ix) Maximum Wind pressure 195 Kg / m"

The equipment shall be for use in moderately hot and humid tropical climate'

conducive to rust and fungus growth'

4. PRINCIPALPARAMETERS:

i)

ii)

iii)

1600 amPeres

lrh";* **"@rds shall be clearl,

brought out in the offer. Four copies ofieference standards in English language shall be

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Short circuit Breaking Current

Creepage distance

26.3 kA for 3 second

900 mm or more.

5.

5.1.1

GENERAL TECHNICAL REQUIREMENTS:

The circuit breakers may be consisting of porcelain clad for each phase mounted

on common clad and mechanically connected for gang operation. The unit shall

be capable of withstanding all pressure resulting from any specified performance

of lhe breaker. The breaker shall be of M2 class ('10,000 operations).

Material used in construction of circuit breaker shall be capable of withstanding

the degree ofvacuum without distortion orfailure of any part.

The circuit breaker shall be supplied complete in all respect with necessary lifting

tools, foundation bolts and other accessories considered necessary by tenderers

for satisfactory operation.

The vacuum interrupter bottles shall be completely maintenance free. Vacuum

interrupter shall be of same type as per type tested design.

Tips of main contracts shall be copper-chromium alloy of good conducting

properties.

All equipment accessories and wiring shall have tropical protection, involving

special treatment of metal and insulation against fungus, insects and corrosion.

The safety clearance of all live parts of the equipment shall be as per relevant

standards.

Electrical as well as mechanical indicator shall be provided to show open and

close positions of breaker. lt shall be located in a position where it will be visible

to a man standing on the ground with mechanism housing closed. An operation

counter shall also be provided with each breaker.

MOUNTING:

The circuit breaker shall be sultable for mounting on steel structures. The prices

of necessary frames for mounting & including connecting material of the circuit

breakers shall be quoted separately.

BUSHING & INSULATOR:

The basic insulation level of the bushings and support insulator shall be as per

clause 4 (Vl) and the circuit breakers shall be suitable for installation in heavily

polluted atmosphere. The porcelain used shall be homogenous and free from

cavities or other flaws. These shall be designed to have adequate insulation,

mechanical strength and rigidity for satisfactory operation under conditions

specified above. All the bushings of identical ratings shall be interchangeable.

5.1.2

5.1.3

5.1 .4

5.1.5

5.1.6

5.1.7

5.1.8

5.2

5.3

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5.4

5.4.1

rbances' when operating at

a voltage up to a voltage 10% above rated voltage and shall also be free from

external and internal corona. Metal parts and hardware shall be hot dip

galvanised as per I55-2633 latest edition

OPERATING MECHANISM:

The circuit breaker shall be designed for remote control from the control room

and in addition there shall be provision for manual operation of circuit breaker

during maintenance and for local electrical triPping and closing'

Thecircuitbreakershallhaveamechanical,open,and,close'indicatorsin

addition to facilities for remote electrical indications'

The operating mechanism shall be electrical motor operated spring closing

mechanism type. The motor shall operate at 240 volts single phase or 415 volts

three phase AC supply with a voltage variation +10% to -20%' The mechanism

shall be trip free electrically and mechanically' All working parts in the mechanism

shall be of corroslon resistant-material and all bearings' which require greasing'

shall be equipped with pressure grease flttings' The mechanism shall be strong

and quick action and shall be removable without disturbing the other parts of

circuit breakers. The mechanism of the breaker shall be such that failure of any

spring will not prevent tripping and will not cause tripping or closing'

The operating mechanism along with its accessories shall be mounted in the

weather proof sheet-steel cabinet with hinged doors & lock device located near

the circuit breaker. The local control switch and the breaker position indicator

shall also be provided in the cabinet The circuit breaker shall also be provided

with means for manual operation for maintenance purpose'

The control circuit shall be designed to operate on 24 volt DC and it shall be

possible to adopting it to work on other voltage by simply changing the operating

coils. The closing coil shall be designed to operate satisfactorily at control voltage

from 85o/o to '1 10olo of the normal voltage' lt shall also be ensured that the trip coil

can operate lrcm TOok to 110% of the normal DC voltage as provided in lS-

13118/gl.AnACheatershallbeprovidedinthecabinettopreventmoisture

condensation.

Necessary cable glands for the cables of the operating mechanism shall also be

provided. The bidder will use the terminal block of moulded dielectric having

brass studs for termination of Purchaser's control cables to be laid for remote

control of the circuit breaker including its automatic tripping under fault condition'

The entire small wiring to be carried out by the manufacturer at the time of

5.4.2

5.4.3

5.4.4

5.4.5

5.4.6

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5.6

5.4.7

5.5

help of lugs duly crimped on to the cable cores. The bidder will supply sufficientnumber of cable grands & rugs for the purchaser's use at the time of erection ofequipment.

Thermostat controlled space heater, internal illumination lamp and 3 pin S_ampsocket with individual ON-OFF switches shall be provided in the cabinet.TERMINAL CONNECTOR: -

Each circuit breaker shall be provided with requisite number of clamp type Bi_

metallic terminal connectors suitable for 0.2 sq. inch ACSR conductor. Two Nos.terminal earth connectors for earthing connection shall also be supplied.INTERLOCKTNG: -

Provision shall be made to enable electrical interlocking with the opening orclosing ofthe isolatorwhen breaker is closed etc. provision should also be madefor light indication arangement on control & relay panels when the electricalmotor is in operation for charging spring, so that breaker is not operated fromremote during the charging cycre. A[ erectricar & mechanicar interrocks. whichare necessary for safe & satisfactory operation, shall be furnished.

AUXILIARY SWTTCHES: -

At least eight pairs of auxiliary contacts each of the normally open and normallyclosed type shall be provided in circuit breaker for customeds use for rhe remote

indicator & control scheme of the circuit breaker and for providing safetyinterlocking with associated equipment by the purchaser. Contact shall beprovided with trip coilfor pre-close and post close supervision of trip circuit.

TERMPEMTURE RISE LIMIT: ,

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

temperature rise limit specified in ISS-13118 over an ambient temperature of

500c.

ERECTION TOOLS:

Special tools and standard accessories required for assembly and formaintenance of lhe breakers should also form a part of the supply. Necessary

list should be supplied with the tender.

RATING PLATE: .

Circuil breaker and its operating device shall be provided with a rating plate

marked with but not limited to following data.

5.7

5.8

5.9

5.10

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Manufacturer's name, type of breaker.Serial number.Rated voltageRated normal continuous cunentRated insulation level.Rated frequencyRated short time breaking current with rated duralion.Total weight of breaker.

WRING:Wiring shall be complete in all respects to ensure proper functioning of thecontrol, protection, monitoring and interlocking schemes. Wiring shall be done

with flexible 1100 V grade, pVC insulated switch board wires with 2.5 sq.mm.

stranded copper conductor. Control wires: FRHR / FRLS (Fire retardant, Low

Smoke) grade wires are procured confirming to IEC standards. Make.

Hardware:

All fasteners Exposed to Air are of stainless steel.

TESTS

TYPE TESTS:

AII the equipment otfered should be fully type tested as per relevant standards.

ln case the equipment of the type and design, offered, has already been type

tested (not later than five years) the Bidder shall furnish four sets of the type testreports along with the offer. The purchaser reserves lhe right to demand

repetition of the same or all type tests in the presence of purchase/s

representative. For this purpose Bidder may quote unit rates for carrying out

each type test. For any change in the design/type already type tested viz a viz

the design/type offered against this specification the purchaser reserves the right

to demand the repetition of the tests without any exlra cost. ln case the

equipment have not been type tested earlier, all the type tests as per relevant

standard shall be carried out by the successful Bidder in the presence ofPurchaser's representative. The following type test in respect of the VCBS are

required to be submitted alongwith the tender.

Lightening impulses voltage test.

Power Frequency voltage test (Dry and Wet).

Temperature rise test.

Measurement of resistantance of main circuit.

Short time withstand current test.

Peak time withstand current test.

Mechanical operation test at ambient air temperature.

&".

s.11

5.12

6.0

6.1

t.

ii.

iii.

iv.

vi.

vii.

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Basic short circuit duties (test duties 1,2,3,4a, 4b,5 ) and criticii current test.

Capacitor current switching test.

The tender without type test certificate of the offered equipment is liable to be

rejected.

Type test reports (should be less than five years old as on due date of tendeD of

tests canied out on offered design of outdoor vcB at srl [i.e. cpRl/ cESl/ KEMA] Accredited

Labs only shall be furnished by the bidder along with offer othenrvise otfer shall be rejected.

Provisional report will not be acceptable. Type test carried out at the factory/ in house premises

will not be accepted.

ACCEPTANCE AND ROUTINE TESTS: -

All acceptance and routine tests as specified hereunder shall be carried out by

the bidder in the presence of Purchaser's representative.

1) Dry power frequency voltages withstand tests on the main circuit.

2) Voltage withstand test on control and auxiliary swjtch.

3) Measurement of resistance of the main circuit.

4) Mechanical operation test.

5) Design and visual checks.

6.2.2 ln addition to above stated tests; the following shall also be performed:

Speed curves for each breaker shall be obtained with the help of a suitable

operation analyser to delermine the breaker contact movement during opening,

closing and trip free operation under normal as well as limiting operation

condition. The test shall show the speed of contacts directly at various siages of

operation, travel of contacts, opening time, closing time, shortest time between

separation and mating of contacts at breaUmake operatjon etc.

6.3 ADDITIONAL TESTS:

The purchaser reserves the right for carrying out any other type tests of a

reasonable nalure at the works of the supplier/laboratory or at any other

recognized laboratory/research institute in addition to the above mentioned type,

acceptance and routine tests at the cost of the purchaser to satisfy that the

material complies wilh the intent of this specification & also if there is any dispute

regarding quality of the equipment.

a. Capacitive current switching test

i) Cable charging test [CC'l& CC2]

ii) Single capacitor bank current switching test IBC1 & BC2].

viii.

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6.2

6.2.1

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b. Seismic test at 0.6 g.

c. Out of phase making & breaking test.

d. Mechanical Operation test at ambient air temperature [M2 class _ 10000

operations.

e. Degree of Protection lp 55.

f. Electrical Endurance test [E21.

INSPECTION:

The inspection may be carried out by the authorized representative purchaser at

any stage of manufacture. The successful bidder shall grant free access to thepurchaser's representative at a reasonable time when the work is in progress.

lnspection and acceptance of any equipment under this specification by the

purchaser shall not relieve the bidder of his obligation of furnishing equipment in

accordance with the specification and shall not prevent subsequent rejection if the

equipment is found to be defective. The Bidder shall keep the purchaser informed

in advance about the manufacturing programme so that arrangement can be made

for inspection.

The purchaser reserves the right to insist for witnessing the acceptance/routine

testing of the bought out items.

No material shall be despatched from the point of manufacture unless the material

has been satisfactorily inspected tested and further despatch authorized by

purchaser.

DOCUMENTATION: -

All drawings shall conform to international standards organization (l.S.O.),A,

series of drawing sheeulndian Standards specification lS: 656. All drawings shall

be in ink and suitable for microfilming. All dimensions and data shall be in S.l.

Units.

LIST OF DRAWNGS AND DOCUMETS:.

The bidder shall furnish four sets of relevant descriptive and illustrative published

literature pamphlets and the following drawings for preliminary study alongwith the

offer.

General outline drawings showing dimensions and shipping weights, quantity of

insulating media etc.

Sectional views showing the general constructional features of the circuit breaker

including operating mechanism, arcing chambers, contacts with lifting dimensions

for maintenance.

Schematic diagrams of breaker offered for control supervision and reclosing.

7.2

8.0

o. I

8.2

a)

b)

c)

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e)

f)

8.3

Struclural drawing

Foundation drilling plan and loading data for foundation design.Type test reports.

8.4

The successful bidder shall within four weeks of placement of order submit foursets of final version of all the above drawlngs for purchaser,s approval. Thepurchaser shall communicate his comments/approvals on the drawings to thebidderwithin reasonable period. The biddershallif necessary, modify the drawingsfor purchaser's approvalwithin two weeks from the date of comments. After receiptof purchaser's approval the bidder shall within three weeks, submit 20 prints andtwo good quarity reproducibre of the approved drawings for purchaser,s use.The successfur bidder sha, arso furnish five copies per breaker of bound manuarscovering erection, commissioning, operation and maintenance instructions and aIrelevant information and drawings pertaining to the main equipment as well asauxiliary devices. Marked erection drawings shall identify the component parts ofthe equipment to enable purchaser to carry out erection with his own personnel.Each manual shall also contain one set of all the approved drawings, type testreports as well as acceptance reports of the corresponding constgnmentdispatched.

The manufacturing of the equipment shal be stricfly in accordance with the8.5

approved drawings and no deviafion shall be permitted without the writtenapprovar of the purchaser. A[ manufacturing and fabrication work in connectionwith the equipment prior to the approvar of the drawing shafl be at the bidder,s risk.

8'6 Approval of drawings Alork by the purchaser shal not rerieve the bidder of any of hisresponsibirity and Iiabirity for ensuring correctness and correct interpretation of thedrawings for meeting the requirements of the latest revision of the applicablestandards rules and code of practices. The equipment shall conform in all respectto high standard of engineering, design, workmanship and ratest revisions ofrelevant standards at the time of supply and purchaser shall have the power toreject any work or material which, is nol in full accordance therewith.

8,7 TEST REPORTS;

l. Four copies of type test reports shalr be furnished to the purchaser within onemonth of conducting the tests. One copy will be returned duly certified by thepurchaser to the bidder wiihin three vyeeks thereafter and on receipt of the same,bidder shall commence with the commercial production of the concerned material.

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Four copies of acceptance Gstiport@copy will be returned, duly certified by the purchaser and only there afterwards thematerial shall be despatched.

All records of routine tesl repods shall be maintained by the bidder at his works forperiodic inspection by the purchaser.

All test reports of tests conducted during manufacture shall be maintained by thebidder. These shall be produced for verification as and when requested for by thepurchaser.

PACKING AND FORWARDING:

The equipment sha[ be packed in suitabre crates so as to withstand handringduring transit. The bidder shall be responsible for any damage to the equipmentduring transrt, due to improper and inadequate packing and handling. The easilydamageable materials shall be carefully packed and marked with the appropriatecaution symbols. Wherever necessary, ploper arrangement for lifting such asliftlng hooks etc. shall be provided. Any material found short inside the packing

cases shall be supplied by the bidder without any extra cost.

Each consignment shall be accompanied by a detailed packing list containing thefollowing information:

Name of the consignee

Details of consignment

Destination

Total weight of consignment

Sign showing upper/lower side of the crate.

Handling and unpacking instructions.

Bill of material indicating contents of each package and spare material.

The bidder shall ensure that the packing list and bill of material are approved by

the purchaser before dispatch.

TRAINING: -

The successful brdder shall be required to provide facilities for in plant training, at

no extra cost to the purchaser to at least two engineers to be nominated by the

purchaser at his works, where the equipment offered shall be manufactured.

lf the equipment offered is being designed and manufactured in coflaboration with

any other manufacturer, the Bidder shal provide facirities for additionar two

t.

a)

b)

c)

d)

e)

0

s)

'10

10.1

10.2

3nL,&N

trainees, shall

suitable for lodging and boarding as well as local conveyance to the placeof training.

nominated by the purctraser 6r. in ptant traidffi- it e

as allowances for out of pocket expenses in respect of theborne by the purchaser. However, the bidder shall provide for

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10.3 ln case of within lndia, to an fro travel expenses, lodging and boardingcharges as

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Annexure-l

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L"^"1,y:_"]r::I pTgker. Jor -o-u!d9or

r"e "nd'strtctt!s to Nigam's specification No. csc_zan:riroriiuinii;ibl

With latest amcnrlmanr.

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L-/Annexure-ll

GUAMNTEED TECHNICAL PARTICULARS FOR CIRCUIT BREAKERS(vAcuuM TYPE)

1. Name of the manufacturer:2. Manufacturefs type & designation:3. Rated voltage KV4. Max. (continuous) service rated voltage KV5. Normal cunent rating.

a) Under normal conditions as specified in ISS Amps.b) Under site conditionsc) ln rush current capability Amps.

6 Short time current rating for 3 sec. KA.7. Maximum temperature rise over ambient

temperature of 500C.8. Breaking capacity.

a) Symmetrical KAb) Symmetrical at rated service voltage MVAc) Asymmetrical KA

9. Making capacity KA (peak)

Total break time in ms.

a) At 10% rated interrupting capacity msb) At rated interrupting capacity ms

1 1. Arcing time ms12. Make time ms.

Minimum reclosing time atfull rated interruptingCapacity from the instant of trip coil energisation. ms.

14. Datra on re-striking voltage 100% &S0% ofrated capacity.

i) Amplitude factorii) Phase factoriiD Natural frequencyiv) RRRV Volts / micro second

15 Dry 1 minute power frequency withstand test voltage KV (rms)a) Between line terminal and grounded object K/ (rms)b) Between terminals with breaker contact open KV (rms)

16. 1.2/50 full micro second wave impulse withstand test voltagea) Between line terminal and grounded objects

(Peak)

b) Between terminals wlth breaker contact open(Peak)

17. Short time rating of vacuum interrupters18. Number of full short circuit operations as per test

Duty 1 to 5 of IEC-56, which it can safely withstand.19. Degree of vacuum inside the vacuum inlerrupters.20. BUSHING:

l. Type of bushings & make.

ll. Dry 1 minute power frequency withstandTest voltage KV (rms)

lll '1.2/50 micro second wave impulse

KV

KV

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lV CreePage distance

KV (peak)

mm.

KV (rms)

KV (rms)

Kg

KV

V Dry flashover value

Vl Wet flashover value

Vll Weight of Bushing

viir Puniture value ofbushing under oil

21. Minimum clearance in air'

l. Between Phases mm

i. tir" Parts to earth mm

22. Number of breaks Per Phase

,i. Number of poles of circuit breaker'

24. Total length of break per Phase'

25. TvPe of auxiliary contacts

26. Itriaterial of auxiliary contacts

,7 . Whether contacts silver-plated or not

28. Thickness of silver Plating

29. Contact Pressure.

;0. iottig; iisttioution between breaker poles

31. Tvpe of device, it "nv

u""i, iJ ri'iiinl rate of rise ot Re-striking Voltage'

g2. Voltage grading devlce, if any

;4. tlumier-ot auxitiary contacts provided'

i- Those closed when breaker is closed'

ii. tho." opun when breaker is closed'

;i ihot" "iir"trur"

*ith respect to the position of main contacts'

34. Type of operating mechanism

Kg.

mm

a)

b)

35.36.

37.38.

39.

40.41.

42.

OpeningClosingControl circuit voltage

Power required for irip coil at 24 volt DC'

Power required for closing coil at 24 voll DC

Total weight of one complete breaker'

Overall dimensions

Details of mounting

List of soecial tools to be supplied

li.i ot iJr"run." ot similar supplies already made

Oor"tn,ng standards to which the breaker shall be manulactureo