22 kv out door vacuum circuit breaker - guvnl office/0... · for 22 kv out door vacuum circuit...
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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
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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:
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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
:
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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) :
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.)
:
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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)
:
:
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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)
:
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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.)
:
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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 :
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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).
:
Getco/Engg/TechSpec/22kV/O/D VCB/R1/Nov07
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’.