22 kV OUT DOOR VACUUM CIRCUIT BREAKER - GUVNL Office/0... · FOR 22 KV OUT DOOR VACUUM CIRCUIT...

Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07

GUJARAT ENERGY TRANSMISSION

CORPORATION LTD.

SARADAR PATEL VIDYUT BHAVAN,

RACE COURSE, BARODA – 390 007.

TECHNICAL SPECIFICATION

FOR

22 kV OUT DOOR VACUUM CIRCUIT

BREAKER



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 with the technical bid. 3. The bidder shall have to submit all the required type test reports for the offered item. In

absence of this, the evaluation shall be carried out accordingly as non-submission of type test reports.

4. The bidder must fill up all the points 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.


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 FIVE 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

SUPP

LIED

TO

ORDER

REFEREN

CE No. &

DATE

ITEMS QUANTI

TY

ORDER

FULLY

EXECUTED.

YES/NO

STATUS, IF

ORDER

UNDER

EXECUTION

REMAR

K

e) 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 specification. The type test reports shall not be older than FIVE years and shall be valid up to expiry of validity of offer.


SECTION – I

GENERAL TECHNICAL REQUIREMENTS

FOR 22 KV OUT DOOR VACUUM CIRCUIT BREAKER

1.1 SCOPE :

1.1.1 This section covers the design, manufacture, testing, inspection, supply

and delivery of 22 KV Out door Circuit Breakers with associated

accessories and complete in all respects specified in the schedule of

requirements.

1.2 APPLICABLE STANDARDS:

1.2.1 Except where specified otherwise in this specification, the circuit

breakers shall conform to the requirements of the latest edition of IS

13118-1991/IEC 56. However, in the event the offered breakers

confirming to any other standard, salient points of differences between

the standard adopted and the standards specified shall be clearly

indicated in the offer.

1.3 DRAWINGS:

1.3.1 As a part of the proposal, the bidder shall furnish the drawings in

triplicate incorporating the following particulars for the purpose of

preliminary studies.

a) Drawing showing the general outline dimensions of circuit

breakers, with clear identification of parts / items.

b) Drawing showing control cabinets and circuit diagrams for

operating mechanism of circuit breakers.

c) Compression type terminal connectors for the breakers.

1.3.2 Within 15 days of receipt of a purchase order, the bidder shall furnish to

the purchaser following drawings for the approval of the purchaser.


a) Outline dimensional drawings showing all parts / items, transport

weight etc. of circuit breaker & its support structure.

b) Sectional views showing the general constructional features,

Operating mechanism, and extinguishing chambers etc. of circuit

breakers.

c) Detailed drawings of operating mechanism of circuit breakers.

d) Wiring and control diagram.

e) Drawings of foundation details, mounting structures, spacing of

bolts etc.

f) Compression type terminal connectors suitable for (ACSR)

panther conductor, with STC rating & bill of material & complete

dimensions.

1.3.3 The bidder may also, submit any other drawings found necessary in

addition to the drawings stated above.

1.4.1 GENERAL DESIGN FEATURES OF CIRCUIT BREAKERS :

1.4.1.1 The circuit breaker shall be VCB type. The breakers shall be offered as a

complete unit with all piping equipment in place and all internal wiring

installed and terminated in the mechanism housing and breaker shall be

compete in all respect.

1.4.1.2 The circuit breakers shall be capable of rapid and smooth interruption of

currents under all conditions completely suppressing all undesirable

phenomena even under the most severe and persistent short circuit

conditions or when interrupting small currents or leading or lagging

reactive currents. The circuit breakers shall be ‘Restrike-Free’ under

all operating conditions. The details of any device incorporated to limit

or control the rate of rise of restriking voltage across, the circuit breaker

contacts shall be stated. The over voltages caused by circuit breaker

while switching inductive or capacitive loads shall not exceed 2.5 times

the highest phase to neutral voltage. The actual make and break times


for the circuit breakers throughout the ranges of their operating duties

shall be stated in the offer and guaranteed.

1.4.1.3 The arc quenching chambers shall have devices to ensure almost

uniform distribution of voltage across the interrupters.

1.4.1.4 Breaking Capacity: -

The interrupting capacity of the breaker for kilometric faults (short line

faults) shall be equal to its interrupting capacity [as per Clause 4-105 of

IS: 13118] and shall be stated in the offer. The details of tests conducted

for confirming the capability of the breakers under kilometric fault

conditions shall be furnished in the offer.

1.4.1.5 The circuit breakers shall be designed for interrupting line charging

currents without undue rise in the voltage on supply side and without

any restrike and without showing signs of undue strain. The guaranteed

over voltage which shall not be exceeded while interrupting the line

charging currents as specified under the Clause 2.4.(10) Section-II of

this specification shall be stated in the offer.

1.4.1.6 The circuit breakers shall be capable of interrupting small inductive

currents (occurring while switching off unloaded transformer) without

giving rise to undue over voltage and without restrikes. The maximum

over voltage value which will not be exceeded under such conditions

shall be stated in the offer, In case of requirement type test for small

inductive current interrupting capacity shall be arranged as per provision

of IEC – 56 or IS: 13118.

1.4.1.7 Restriking Voltage :-

The circuit breakers shall be capable of interrupting the rated power

when the restriking voltage has a frequency of not less than 400 Hz and

with a restriking voltage having frequency of 2000 Hz. The circuit

breakers shall be capable of interrupting atleast 50% of nominal

breaking capacity.


1.4.1.8 The measures adopted for ensuring proper operation at high rate of rise

of restriking voltage and for limiting the actual voltage values across the

breaks shall be described in the offer. The type characteristics and rating

of the resistor used, if any, to shunt the breaker contacts and of the

auxiliary switching devices used for interrupting the resistor current

shall be clearly stated.

1.4.1.9 Recovery voltage and power Factor:

The circuit breaker shall be capable of interrupting the rated power with

recovery voltage equal to the rated maximum line to line service voltage

at rated frequency and at a power factor not exceeding 0.15.

1.4.1.10 The circuit breakers shall also be capable of satisfactory operation even

under conditions of phase opposition that may arise due to faulty

synchronising. The maximum power which the breaker can satisfactorily

interrupt under phase opposition shall be stated in the offer.

1.4.1.11 The operating duty of the circuit breaker shall be as specified under

Clause-2.4.1 (11) section II of specific technical requirement for

breakers.

1.4.2 Temperature Rise :-

1.4.2.1 The temperature rise and the maximum temperature on any part of the

equipments when in service under continuous full load conditions and

exposed continuously to the direct sun-rays shall not exceed the

permissible limits as per relevant ISS. When the standard specifies the

limits of temperature rise, this shall not be exceeded when corrected for

the difference between ambient temperature at site and the ambient

temperature specified in the relevant specification. The correction

proposed shall be stated in offer and shall be subject to the approval of

the purchaser.

1.4.3 General Features of Circuit Breakers :-

1.4.3.1 The circuit breakers shall be suitable for outdoor operation under the

climatic conditions specified in section-II of this specification.


1.4.3.2 Exposed live parts shall be placed high enough above ground to meet

the requirements of local safety codes.

1.4.3.3 All similar parts, particularly removable one and shall be

interchangeable with one another.

1.4.3.4 VCB shall consist of three identical single phase units with common

operating mechanism suitable for specified duty. Bidder may give

complete constructional details for VCB offered by them. The

insulation level of porcelain of the circuit breaker shall be so co-

coordinated with that of the equipment that flashover shall occur

externally to the equipment.

1.4.4 Insulation of the Circuit Breaker :-

The insulation to ground, the insulation between open contacts and the

insulation between phases of the completely assembled circuit breaker

shall capable of withstanding satisfactorily die-electric test voltages

corresponding to BIL specified in Clause –2.4.2 SECTION – II of this

specification i.e. Lightening impulse with stand voltage shall be150

KVP & One minute P.F. withstand voltage shall be 55 KV rms.

1.4.5. Adequate clearance shall be provided between phase and from phase to

ground. The clearance shall be such that the breaker shall withstand the

BIL specified under clause no.1.4.4 of this specification. The minimum

clearance from live parts to ground level shall however be subject to the

purchaser’s approval.

1.4.6 Contacts of Circuit Breaker :-

1.4.6.1 The main contacts shall have adequate area and contact pressure for

carrying the rated currents and the short time rated breaking currents of

the breaker without excessive temperature rise. Contacts shall have a

minimum of movable parts and adjustments. The main contacts shall be

first to open and last to close so that burning and wearing of the contact

may be negligible. Main contacts shall be of copper. Moving contacts

shall have permanent marking or scale. Identification shall be invariably


and legibly marked on VCB mechanism so that the extent of wear and

tear can be measured. Necessary instruction there of shall be furnished

on front of panel.

1.4.7 Operating Mechanism of Circuit Breakers :-

1.4.7.1 Circuit breakers shall be power operated either by pneumatic mechanism

or by a motor compressed spring charging mechanism depending on the

type of breaker offered. The mechanism will be trip-free electrically and

mechanically. The mechanism shall be strong, quick in action and shall

be removable without disturbing other parts of the circuit breakers. All

the working parts in the mechanism shall be of corrosion resistant

materials and all bearings which require greasing, shall be equipped with

pressure grease fittings. The mechanism and breaker shall be such that

the failure of any spring will not prevent tripping and will not cause

tripping or closing.

1.4.7.2 The circuit breakers shall be designed for remote control from the

control room and there shall be provision for manual operation of circuit

breakers during maintenance and for local tripping and closing by

normal means.

1.4.7.3 The circuit breaker shall have a mechanical ‘ON-OFF’ indicator in

addition to facilities for remote electrical indicator.

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

a weather proof cabinet with hinged doors located near the breakers..

The local control switch and the breaker position indicator shall be

provided in this cabinet. The control circuit shall be designed to operate

on 110 V.D.C. as specified in section-II of this specification. The

closing and opening coils shall be designed to operate satisfactorily at

any control voltage from 80% to 115% of the normal voltage. A heater

of adequate capacity with thermostat shall be provided in the cabinet to

avoid moisture condensation.


1.4.7.4(a) The terminal block shall of 1.1 KV voltage grade & shall be with stud

type connections instead of with screw types connections.

1.4.8 Auxiliary switches:-

A minimum number of 6 NC + 6 NO Auxiliary switches contacts shall be

provided on each circuit breaker for use in remote indication control scheme

of the circuit breakers and for safety interlocking. Special contacts for use with

trip coils shall also be provided. Provision shall be made for adding more

auxiliary switches, if required. Auxiliary switches shall be placed in weather

proof galvanized casing and current rating of switches shall be mentioned in

the bid.

1.5 BUSHING & INSULATORS :

1.5.1 The porcelain insulator used in manufacturing the bushings shall be

homogeneous, free from laminations, cavities and other flaws or

imperfection that might affect the mechanical or dielectric qualities. All

bushings of identical ratings shall be interchangeable. The bushings

shall conform to the latest edition of IS: 5621 or any other equivalent

standard (Latest). The puncture strengths of the bushings shall be greater

than their flashover values. The bushings shall be entirely free from

external and internal corona. The total minimum creepage distance of

the bushings shall be suitable for heavily polluted atmosphere.

1.6 TERMINAL CONNECTORS AND EARTHING TERMINALS :

1.6.1 6 Nos. of Compression type terminal connectors per breaker suitable for

ACSR “PANTHER” Conductor shall be supplied and they shall be

suitable for both vertical and horizontal connections of the Transmission

line conductor or station bus bar. Suitable terminal earth connectors (two

Nos.) for earthing connections shall also be supplied. The drawing of

this connector shall be submitted. SS bolt for connector shall be

provided with two Nos. of SS nuts (including lock nut) & one SS

washer.

1.7 TROPICALISATION:


1.7.1 All control wiring, electric motors and accessories shall be protected

against fungus growth and other harmful effects due to tropical

environments.

1.8 GALVANISING:

1.8.1 All ferrous parts of breakers and compressed air plant including bolts, nuts etc.

shall be hot-dip galvanised as per latest edition of IS: 2629.

1.9 PAINTING :

1.9.1 Mechanisms, enclosures, cabinets and other metal parts shall be

thoroughly cleaned to remove all rust scales, corrosion and other

adhering foreign matter, steel surfaces, as far as possible shall be

painting with not less than two coats of heat resistant, oil insoluble,

insulating varnish light-grey pains as per shade no.631 of IS:5 shall be

selected to withstand tropical heat and extremes of weather/heavily

polluted atmosphere.

1.10 TEST AND TESTS REPORTS :

1.10.1 Reports of following type tests carried out in Govt. approved

laboratory within five years prior to Date of Bid opening and shall be

valid up to expiry of validity of offer as per IS: 13118 for circuit

breakers shall be submitted along with the offer :

(i) Lightening impulse withstand voltage test

(ii) Power frequency voltage withstand voltage test. (DRY as well as

wet).

(iii) Temperature rise test.

(iv) Measurement of resistance of main circuit

(v) Short time current withstand and peak current with stand Test

(vi) Mechanical endurance test

(vii) Single phase short circuit test.

(viii) Out of phase making and breaking current test.

(ix) Capacitor current switching test for isolated neutral capacitor

banks.

In case of non-submission of some of the type test reports, the bidder

shall confirm the submission of same before commencement of supply

without affecting delivery schedule of breaker.


1.10.2 Routine tests as per the latest edition of IS : 13118 for circuit breakers

shall be carried out on each circuit breaker (in presence of purchaser’s

representative if degreed by the purchaser).

1.10.3 The test reports for type tests and routine tests in respect of associated

equipments as motors, instruments, relays etc. as per the latest edition

of the relevant IS shall be supplied by the bidder.

1.10.4 All tests reports for acceptance / routine tests shall be submitted and got

approved from the purchaser before dispatching the breaker.

1.11 SPARE PARTS:

1.11.1 The bidder shall furnish an item wise list and quantity of recommended

spare parts, if any, for five years' operation of the air break Isolators,

with unit price of each part.

1.12 ERECTION :

1.12.1. The bidder shall quote for the services of an erection engineer who shall

take full responsibility for the erection, testing, and commissioning of

the breakers. Skilled labour for erection work will have to be arranged

for by the successful bidder. Erector shall bring all special tools and

instruments required. Rates of pay, on daily and monthly basis as well as

the estimated duration of execution shall be indicated.

1.12.2. The erection and commissioning of the breaker shall be supervised, if

required by the purchaser, through supplier’s representative who shall

direct the sequence of erection and make necessary adjustments to the

apparatus and correct in the field any errors or omissions on the part of

the supplier in order to make the breakers and material to function in

accordance with the intent of this specification.

1.12.3. The purchaser shall not be responsible for any damage to the breaker

during commissioning if such damages result from faulty or inadequate

erection. Purchaser shall provide local workmen as well as ordinary

tools and equipments required for erection.


1.12.4. Supplier shall not be liable for any loss, damage or injury to property or

persons at the installation site unless such damage or injuries are caused

by any act or negligence of the supervising erector.

1.13 TECHNICAL & GUARANTEED PARTICULARS :

The bidder shall furnish all guaranteed technical particulars as called for in

section-IV (Schedule-‘A’) of this specification. Particulars which are

subject to guarantee shall be clearly stated offers not containing this

information will not be considered.

Deviation against any clause of this technical specification shall be

clearly described in annexure – 12 only.

1.14 INSTRUCTION MANUALS:

1.14.1 There copies of operation, maintenance and erection manuals in English

language shall be supplied one month prior to the dispatch of the circuit

breakers. In addition, two copies of the same per sub-station shall be

supplied. The manuals shall be bound volumes and shall contain all the

drawings and instructions required for erection, operation and

maintenance and in addition the following particulars:

a) Marked erection prints identifying the component parts of the

circuit breakers and current transformers as dispatched with the

assembly drawings.

b) Details dimensions, assembly and description of all the

components and catalogues for operation of the circuit breaker

and accessories.

c) List of recommended spare parts of circuit breaker.


SECTION – II

TECHNICAL SPECIFICATION

FOR 22 KV OUTDOOR CIRCUIT BREAKERS

SPECIFIC REQUIREMENTS.

2.1 SCOPE:

This section covers the specific technical requirements, climatic and

isocerunic conditions and system particulars for which the circuit

breakers shall be offered as per the General Technical Requirements

given in Section-I of this specification and the schedule of requirements

specified herein for the various sub stations.

2.2 CLIMATIC & ISOCERAUNIC CONDITIONS:

2.2.1 The climatic conditions under which the breaker shall operate

satisfactorily are as follows:

a) Maximum ambient temperature of

air in shade (0C).

: 50

b) Minimum ambient temperature of

air in shade (0C).

: 4

c) Maximum daily average ambient

temperature (0C).

: 40

d) Maximum yearly average ambient

temperature (0C).

: 30

e) Maximum relative humidity (%). : 95

f) Average number of thunderstomn

days / annum.

: 15

g) Average annual rainfall (Cm.) : 150

h) Maximum wind pressure (Kg/m2) : 150


i) Height above mean see level (m). : Not exceeding 1000

meters.

2.2.2 All breakers offered shall be suitable for continuous satisfactory

operation at the full rated capacity under the above climatic conditions.

2.2.3 Since the sub-station may be near seashore or Industrial area, the

breaker offered shall be suitable for heavily polluted atmosphere.

2.3 SYSTEM DETAILS:

i) Nominal system voltage(KV) : 22

ii) Maximum rated voltage (KV) : 24

iii) Frequency (Hz ) : 50

iv) Number of phases : 3

v) Neutral Earthing : Solidly earthed.

vi) Auxiliary power supply : 1) 240 Volts 1-φ & 415 Volts 3-φ,

50 Hz A.C., with the variation of

frequency 48.5 to 51.5 and

voltage +10% & -15%

occasionaly.

2) 110 Volts or 220 Volts 2-wire

D.C. supply subject to variations

of ± 10%.

The circuit breakers shall complete with following technical requirements. :

11) Number of Poles 3

2) Basic Insulation level


1) 1.2/50 Microsecond impulse

withstand voltage (KVP).

2) On Minute Power Frequency

withstand voltage (KV rms).

:

:

150

55

3) Rated normal current (Amps.) : 1250

3a) Rated symmetrical breaking

capacity at highest system voltage.

(MVA)

: 1000

4) Rated short circuit breaking capacity

KA (rms.)

: 25

5) Rated duration of short circuit

seconds.

: 3

6) Total break time for any current

upto the rated breaking current

cycles.

: 3

7) Closing time. : Not more than 10 cycles.

8) Rated characteristics for short line

faults

: As per Clause 4.105 of IS:

13118/IEC-56.

9) Rated transient recovery voltage for

terminal fault.

: As per Clause-4. 102 of IS:

13118/IEC56.

10) Rated line charging current breaking

capacity (Amps.)

: 10

11) Rated short circuit making current

KAP.

: 63

12) Rated operating duty : 0-0.3 Sec-Co-3 Min. Co.


13) Total creepage distance for heavily

polluted atmosphere (mm ).

: 560

14) Type of circuit breaker : Vacuum

2.5 EARTH QUAKE & WIND DESIGN LOADS:

Each circuit breaker including its supporting structure shall be designed

to withstand required earthquake acceleration of 0.08 x 2 g and with

wind loads of 150 Kg/m2 on the projected area (non-simultaneous)

without damage to component parts and without impairment of

operation.


APPENDIX - I

BIDDING SCHEDULES

(TO BE FILLED IN & SIGNED BY THE BIDDER)

SCHEDULE ‘A’

GUARANTEED TECHNICAL PARTICULARS FOR 66KV CIRCUIT

BREAKERS

1. Name of Manufacturer :

2. Type Designation :

3. Governing Standard :

4. Rated Voltage (KV) :

5. Maximum continuous rated

service voltage (KV)

:

6. Frequency (Hz) :

7. Operating duty cycle

8. Nominal current rating (Amps.)

Under standard condition.

(Amp)

Under site condition (Amp).

Derating factor, if any for site

conditions.

:

:

:

:

9. Short time current rating (KA)

for 3 seconds

:


10. Maximum temperature / rise

over ambient temp. due to

rated current in main contacts

measured after breaking test.

(0C)

:

11. Rated short circuit breaking

current

Rated short circuit current (AC

component) (KV rms).

Percentage DC component

Assymetrical breaking current

(including DC component

(KA rms).

Rated symmetrical breaking

capacity in MVA FOR

MOCB & FOR

SF6 CB

:

:

:

:

:

12. Making capacity (KA Peak) :

13. Total breaking time (Milli-

seconds) :

a) For interruption of 10% of

the rated capacity.

b) For interruption of 30% of

the rated capacity.

c) For interruption of 60% of

rated capacity.

d) For interruption of the full

rated capacity.

:

:

:

:

:

14 Arcing time ( Milli seconds ) :

15. Making time (Milli seconds) :


16. Minimum reclosing time at

rated interrupting capacity from

the in fault of the trip coil

inrgisation (Milli-second)

:

17. A) Minimum dead time

a) 3 phase reclosing (Milli

seconds).

b) Limit of adjustment of

dead time for 3-phase

reclosing.

B) Whether restrike free and

trip free. (IS/IEC

applicable may be stated).

:

:

:

:

18. Rate of rise of restriking

voltage for 100%, 50% & 30%

rated capacity

a) Amplitude factor (max)

b) Phase factor (max)

c) Natural Frequency (Hz)

d) Rated of rise of restriking

voltage (V/Micro Sec)(max)

:

:

:

:

:

19. Maximum interrupting capacity

under phase opposition

condition (MVA).

:

20. Maximum line charging current

breaking capacity without over

voltage exceeding 2.5 neutral

voltage (Amps.)

:


21. Maximum line charging current

breaking capacity

corresponding over-voltage

recorded

a) On supply side.

b) On line side.

:

:

:

22. Maximum cable charging

current breaking capacity &

corresponding over-voltage

recorded in test.

a) On supply side.

b) On line side.

:

:

:

23. Maximum shunt capacitor Bank

switching capacity (MVA)

:

24. Maximum breaking capacity on

kilometric fault (MVA)

:

25. Maximum over-voltage on

switching transformers on no

load & the charging current.

:

26. Dry 1 Minute power frequency

test withstand voltage, for

complete circuit breaker

Between line & Grounded parts

(KV rms)

Between line with breaker

contacts open (KV rms)

:

:


27. Wet 1-minute power frequency

withstand voltage for complete

circuit breaker

a) Between line terminal &

grounded parts (KV rms)

b) Between terminals with

breaker contacts open

(KV rms.)

:

:

:

28. 1.2/50 Micro-second wave

lightening impulse withstand

test voltage for complete circuit

breaker

a) Between line terminal and

ground (KV peak)

b) Between terminal with

circuit breaker contacts

open (KV peak).

:

:

:

SUPPORTING INSULATORS :

29. Make & Type :

30. Insulation Class :

31. Visible Corona discharge

voltage

:

32. Wet 1-minute power frequency

f1ashover voltage (KV rms).

:

33. Dry 1-minute power frequency f1ashover

voltage (KV rms) :

34. 1.2/50 micro-second impulse

f1ashover voltage (in KV peak)

:


35. Total creep age distance for

heavily polluted atmosphere

:

36. Minimum clearance in air

a) Between phases (mm)

b) Live parts & earth (mm)

Live parts to ground level

(mm).

:

:

:

:

37. No. of poles per circuit breaker :

38. Breaks per pole Nos.

:

39. Total length of breaks per phase

(mm).

:

40

41.

Type of main contacts

Material of main contacts

:

:

42. Whether main contacts silver

plates (Yes/No)

:

43. Thickness of silver coating on

main contacts (mm).

:

44. Contact pressure on main

contacts (Kg/M2).

:

47. Type of auxiliary switches :

48. Material of switch contacts :

49. Whether contacts silver plates

(Yes/No.)

:


50. No. of auxiliary switch contacts

operating with all three poles of

breaker

a) Which are closed when

breaker is closed.

b) Which are open when

breaker is closed

:

:

:

51 No. of spare auxiliary switch

contacts operating

a) Which are closed when

breaker is closed.

b) Which are open when

breaker is closed.

:

:

:

52. No. of operations possible

without maintenance

At full rated interrupting

capacity.

At 50% of rated interrupted

capacity

At 100% of rated current

At 50% of rated current.

:

:

:

:

:

53. Details of foundation :


54. Type of operating mechanism

(motor operated spring

charged).

a) Opening

b) Closing

c) Control voltage aux.

:

:

:

:

55. Tripping & closing circuit

voltage (V).

:

56. Power required for trip coil (in

watts).

:

57. Power required for closing coil

(in watts).

:

58. Weight of 3-φ breaker complete

with operating mechanism,

supporting, insulators, frame

work etc.

:

59. Impact loading for foundation

design to include dead load plug

impact value on opening it

maximum interrupting rating in

terms of equivalent static load.

:

60. Weight of heaviest package

(Kgs)

space requirements (Length,

Width, Height).

:


61. DETAILS OF VACUUM:

a) Quantity of vacuum per C.B.

(bars)

b) Standard applicable for

vacuum

:

:

SEAL OF THE FIRM SIGNATURE OF TENDERER

Note :

1) Instead of giving reference of drawing No./ IS Literature etc. actual values /

figures must be furnished wherever required otherwise it will be completed to

consider that the details in GTP are not furnished & technical Bid will be

evaluated accordingly.

2) The tenderer should furnish the various make for bought out items wherever

required in GTP instead of indicating ‘ or its equivalent’.

22 kV OUT DOOR VACUUM CIRCUIT BREAKER - GUVNL Office/0... · FOR 22 KV OUT DOOR VACUUM CIRCUIT...

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Transcript of 22 kV OUT DOOR VACUUM CIRCUIT BREAKER - GUVNL Office/0... · FOR 22 KV OUT DOOR VACUUM CIRCUIT...