03AnnexureABUYHPL011617

1
Tender Specification No. : BUY/HPL-01/16-17
CENTRAL POWER RESEARCH INSTITUTE
CV Raman Road, Sadashiva Nagar,
Bengaluru, Karnataka
Annexure-A
TECHNICAL SPECIFICATION OF
245kV SINGLE POLE LIVE TANK
SF6 CIRCUIT BREAKER
2
CONTENTS
I. SPECIAL INSTRUCTIONS TO BIDDER
II. QUALIFYING REQUIREMENT DATA
III. TECHNICAL SPECIFICATIONS FOR 245 kV SF6 CIRCUIT BREAKER
IV. GENERAL TECHNICAL REQUIREMENTS
V. TESTS
VI. INSPECTION
VII. QUALITY ASSURANCE PLAN
VIII. PACKING AND FORWARDING &UNLOADING
IX. QUANTITY AND DELIVERY REQUIREMENTS
X. SUPERVISION SERVICES
XI. MANDATORY SPARES AND TOOLS
XII. GUARANTEED TECHNICAL PARAMETERS
3
I. SPECIAL INSTRUCTIONS TO BIDDER
Please read following instructions carefully before submitting your bid.
1.1) All the drawings, i.e. elevation, side view, plan, cross sectional view etc., in Auto CAD
format and manuals in PDF format, for offered item shall be submitted. Also the hard copies
as per specification shall be submitted.
1.2) The bidder shall submit Quality Assurance Plan for manufacturing process and Field
Quality Plan with the technical bid.
1.3) 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.
1.4) 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.
1.5) All the points other than GTP, which are asked to confirm in technical specifications
must be submitted separately with the bid.
1.6) 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 CPRI,
in the event of an order, free of cost. The cost of logistics will be borne by CPRI.
1.7) Please note that the evaluation will be carried out on the strength of content of bid only.
No further correspondence will be made.
1.8) The bidder shall bring out all the technical deviation/s only at the specified annexure.
II. QUALIFYING REQUIREMENT DATA
(For Supply)
Bidder to satisfy all the following requirements.
2.1) 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.
2.2) The minimum requirement of manufacturing capacity of offered type, size and rating of
equipment shall be THREE times tender / bid quantity. The bidder should indicate
manufacturing capacity by submitting latest updated certificate of a Chartered Engineer (CE).
2.3) 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
2.4) 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,
S.No
ITEM
ORDER
SUPPLIED REF.
NO.
TO
& DATE
ITEMS
QUANTITY
ORDER
FULLY
EXECUT
ED
YES/NO
STATUS, IF
ORDER
REMARK
UNDER
EXECUTION
2.5) Equipment offered shall have Type Test Certificates from accredited laboratory
(accredited based on ISO/IEC Guide 25 / 17025 or EN 45001 by the National Accreditation
body of the country where laboratory is located) who must be member of STL, 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.
III. TECHNICAL SPECIFICATIONS FOR
245 kV SF6 CIRCUIT BREAKER
3.1 SCOPE:
3.1.1. The scope covers design, engineering, manufacture, assembly, inspection and testing
at manufacture's works, supply, delivery and erection of Two numbers of SF6 circuit breakers
complete with structures, accessories, auxiliary equipment and mandatory spares specified
herein for their satisfactory operation in various sub-stations of our system.
3.1.2. It is not the intent to specify completely here all the details of design and construction
of the circuit breakers, however, the breaker's shall conform in all respects to the high
standard of engineering design and workmanship and shall be capable of performing in
continuous commercial operation up to the guarantee in manner acceptable to the CPRI who
will interpret the meanings of drawings and specifications and shall have power to reject and
work or material which in his judgment is not in accordance therewith. The circuit breakers
offered shall be complete with all components necessary for their effective and trouble-free
operation. Such components shall be deemed to be within the scope of the Bidder irrespective
of whether they are specifically brought out in this specification and / or in the commercial
5
order or not. It should also be type tested and supposed to pass all accepted tests as per
IEC/IS.
3.2 STANDARDS
The circuit breakers shall conform to the latest revisions with amendments available at the
time of testing of relevant standards, rules and codes, some of which are listed herein for
ready reference. Equipment meeting with the requirements of any other authoritative
standards, which ensures equals or better quality than the standards mentioned herein may
also be offered. In that case, salient points of difference between the standards adopted and
the specified standards shall be clearly brought out in the bid and shall be considered
acceptable, if found justified after due technical evaluation.
SR. NO
STANDARD
TITLENO.
1
IEC-62271-100
Specification for alternating current circuit breaker
2
IEC-62271-203
Gas Insulated metal-enclosed switchgear for rated
voltages above 52KV
3
IEC – 62271-1
Common clauses for high voltage Switchgear and
control-gear standards
4
IEC – 62271-102
Alternating current
earthing switches. Induced
current switching
5
IEC - 60137
6
IEC – 62271-209
7
IEC – 60480
Bushing for alternating voltages above 1000V
Cable connections for gas-insulated switch gear
Guide to checking of sulphur hexafluoride taken
from electrical equipment
8
IEC-376
Specification and acceptance of new supply of sulfur
hexafluoride
9
IEC: 60947
Degree of protection provided for enclosures for low
voltage switch gear and control gear
10
IS-325
Specification for three phase induction motors
11
IS-2516
Specification for high voltage alternating current
circuit breakers
12
IS-2629
Recommended practice for hot dip galvanizing of iron
and steel
6
13
IS-2099
High voltage porcelain bushing
14
IS -2486
Specifications for clamp connectors
15
IS-2062
Hot Rolled Medium and High Tensile Structural Steel
3.3 DOCUMENTATION:
3.3.1. All drawings shall conform to International Standards Organisation (ISO) 'A' series of
drawing sheet/Indian Standards Specification. All drawings shall be in ink and suitable for micro
filming. All dimensions and data shall be in S.I. Units.
3.3.2. List of Drawings and Documents:
The Bidder shall furnish four sets of relevant descriptive and illustrative published literature
pamphlets and the following drawings for preliminary study along with the offer.
a) General outline drawings showing dimensions and shipping weights, quantity of insulating
media, air receiver capacity etc.
b) Sectional views showing the general constructional features of the circuit breakers including
operating mechanism, arcing chambers, contacts etc., with lifting dimensions for maintenance.
c) Schematic diagrams of breakers offered for control supervision and re-closing.
d) Structural drawing, design calculations and loading data for support structures.
e) Foundation drilling plan and loading data for foundation design.
f) Terminal pads.
3.3.3. The successful Bidder shall within 2 weeks of placement of order submit two sets of
final version of all the above drawings for purchaser's approval. The CPRI shall communicate
his comments / approval on the drawings to the supplier within reasonable period. The
supplier shall, if necessary, modify the drawings and resubmit two copies of the modified
drawings for purchaser's approval within two weeks from the date of comments. After receipt
of purchaser's approval, the supplier shall, sent two sets of approved drawings in hard copy
and one soft copy (in AUTOCAD format) with each breaker to CPRI, CV Raman road,
Sadashiva nagar, Bangalore.
3.3.4. 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.
3.3.5. Additional data to be furnished along with the offer:
a) Drawing showing contacts in close, arc initiation, full arcing, arc extinction and openposition.
7
b) The temperature v/s pressure curves for each setting of density monitor, along with details of
density monitor.
c) Method of checking the healthiness of voltage distribution devices (condensers) provided
across the breaks at site.
d) Data on capabilities of circuit breakers in terms of time and number of operations at duties
ranging from 100% fault currents to load currents of the lowest possible value without requiring
any maintenance or checks.
e) Sectional view of non return couplings if used for SF6 pipes (for SF6 Circuit Breakers).
f) Details and type of filters used in interrupter assembly and also the operating experience with
such filters.
g) Details on SF6 Gas :
i) Proposed tests to assess the condition of SF6 gas within a circuit breaker after a period
of service particularly with regard to the purity and moisture contents of the gas.
ii) The precise procedure to be adopted by maintenance personnel for handling equipment
who are exposed to the products of arcing in SF6 gas, so as to ensure that they are not
affected by possible irritants of the skin and respiratory system. Recommendations shall
be furnished for suitable protective clothing, methods of disposal of circuit breaker
cleaning utensils and other relevant matters.
h) A complete catalogue on operation analyzer satisfying all the requirements stipulated in this
specification.
i) Curves supported by test data indicating the opening time under close open operation with
combined variation of trip coil voltage.
j) Detailed literature and schematic diagrams of switching mechanism for closing resistor
showing the duration of insertion shall also be furnished along with calculations in respect of
thermal rating of resistors for the duties.
k) All duty requirements shall be proved with the support of adequate test reports to be furnished
along with the bid failing which the bid is likely to be rejected.
3.3.6 Test Reports:
i) Two copies of acceptance test reports shall be furnished to the Purchaser. One copy will be
returned, duly certified by the Purchaser and only there afterwards the material be dispatched.
ii) All records and routine test reports shall be maintained by the supplier at his works for
periodic inspection by the Purchaser.
iii) All test reports of tests conducted during manufacture shall be maintained by the Supplier.
These shall be produced for verification as and when requested for by the Purchaser.
8
3.3.7. The bidder may submit any other drawing found necessary in addition to the drawings
stated above.
3.4 TEMPERATURE RISES:
3.4.1. The temperature rise and the maximum temperature on any part of the equipment when
in service of site under continuous full load conditions and exposed continuously to the direct
rays of the sun shall not exceed the permissible limits as per IEC latest publication, 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 the bid and shall be subject to the approval of the purchaser.
3.4.2. Breakers shall be so designed that when operated within their specified rating, the
temperature of each part will be limited to values consistent with a long life of the material used.
The temperature shall not exceed that indicated in IEC-62271-100 under specified ambient
conditions.
3.5 PRINCIPAL PARAMETERS:
The breakers shall conform to the specific technical requirements specified hereunder:
Sl.NO
Description
Requirement
1.
Rated system voltage (kV rms),
220
2.
Rated Frequency
3.
Maximum System Voltage kV rms
245
4.
Continuous current rating (A) rms
2500
5.
Type
6.
Mounting
7.
Number of Poles
Hot dip galvanized lattice steel support
structure, bolted type
1
8.
Type of operation
Individually operated single pole
9.
Required ground clearance from the
lowest live terminal if both the
Terminals are not in the same horizontal
plane. (mm)
Minimum height of the lowest part of the
support insulator from ground level (mm).
11.
(50 Hz)(+/-5%)
1 pole outdoor SF6
4800
2550
9
12.
Operating mechanism
Spring
13.
Auto re-closing duty
Single
14.
Rated operating duty cycle min.
15.
16.
"First pole to clear" factor (type of
tripping)
Max. closing time (ms)
17.
Max. total break time (ms)
18.
1.2/50 microsecond impulse
withstand voltage(kV peak):
19.
20.
1050
1.0 minute power frequency withstand
voltage (kV rms)
Rated breaking current capacity
460
i) Line charging at rated voltage at 90 deg.
leading power factor (A) rms.
125
iii) Cable charging breaking current (A)
iv) Short circuit current
a) AC component (kA rms)
b) % DC component
c) Duration of short circuit
in sec.
Rated short circuit making
current capacity (kA)
22.
Permissible limit of temperature
Rise
Max. acceptable difference in the
instants of closing/opening of contacts
Min. creepage distance of support
insulator (mm)
Short time current carrying capability for
one second (kA)
25.
0.5 to 10
Without switching o/v exceeding 2.0
p.u.
250
50
Corresponding to minimum opening
time as per IEC-62271-100.
21.
24.
As per IS-62271-100
trip free
120
Less than 3 cycles or 60 ms
ii) small inductive current (A) rms
23.
O-0.3 sec.-CO-3min-CO
1 sec.
125
As per table given in Clause 4.32
Single Break is required
6125
50
10
26.
i) Rating of auxiliary contacts
10 A at 220 V DC
ii) No. of auxiliary contacts
10 NO and
10 NC as spare
2 A DC with the circuit time
constant not less than 20 ms.
75 db (max.)
27
Breaking capacity of auxiliary contacts
28.
Noise level at base and upto 50 meters
29.
Seismic acceleration (horizontal)
0.1 g
30.
Min. Corona extinction voltage (kV rms)
156
31.
No. of closing and tripping coils.
Two trip coils and one close coil with
Anti-pumping arrangement.
(Bidders offering lesser clearances for spacing must substantiate the same with adequate
information on impulse test withstand capability of equipment).
3.6 OPERATIONAL CAPABILITIES
The circuit breaker shall have the following operating capabilities;
a) Shunt Capacitor Switching Capacity
b) Breaking Capacity for Kilometeric Fault
c) Transformer Charging Current Breaking Capacity
d) Restriking Voltage Breaking Capacity
e) Recovery Voltage and Power Factor Breaking Capacity
f) Automatic Rapid Reclosing
h) Cable charging breaking capacity
i) Line charging breaking capacity
3.7 TRIP FREE OPERATION:
The circuit breakers shall be trip-free as per IS-2516.
IV. GENERAL TECHNICAL REQUIREMENTS:
4.1) Any part of the breaker, especially the removable ones, shall be freely interchangeable
without the necessity of any modification at site.
4.2) Breaker assemblies with bases, support structure for circuit breaker as well as for control
11
cabinet, central control cabinet and foundation bolts for main structure as well as control
cabinet and central (except concrete foundations) terminals and operating mechanisms are
included in the scope of supply.
4.3) Compressed SF6 gas, spring operating system in all respects, also included in scope of
supply.
4.4) All necessary parts to be provided for a complete circuit breaker installation such as
main equipment, terminal, control parts, connectors and other devices, whether specifically
called for herein or not.
4.5) The circuit breaker shall be designed for single phase reclosing breaker.
4.6) All other parts like control cabinet, mechanism, housing shall be epoxy painted as per
shade 697 IS-5. Bolts, nuts etc shall be hot dip galvanized/steel.
4.7) The terminal pads shall be of aluminium alloy/copper. In case if terminal pads are of
copper, than they will be silver plated with at least 50 microns thickness.
4.8) The current density adopted for the design of the terminal pads shall, in no case exceed
the following values. For copper pads 1.6 A/sq. mm and others 1.0 A/sq. mm.
4.9) All gasketed surfaces shall be smooth, straight and reinforced, if necessary to minimize
distortion and to make a tight seal. The operating rod connecting the operating mechanism to
the arc chamber (SF6 media) shall have adequate seals. The manufacturer shall guarantee that
the gas leakage rate should not exceed 1 % p. a. failing which total cost of refilling the gas
including service charges shall be borne by the supplier.
4.10) In the interrupter assembly, there shall be an absorbing product box to eliminate SF6
decomposition products and moisture. The material used in the construction of the circuit
breakers shall be fully compatible with SF6 gas.
4.11) SF6 density of circuit breaker shall be monitored and regulated by density monitor and
pressure switches respectively in each pole. The SF6 gas density monitor shall be adequately
temperature compensated. It will meet the following requirements:
a. It shall be possible to dismantle the density monitor for checking/replacement without
draining the SF6 gas by using suitable interlocked non-return couplings.
b. It shall damp the pressure pulsation while filling the gas service so that the flickering of the
pressure switch contacts does not take place.
c. A gas pressure indicator shall also be supplied.
4.12) Facility shall also be provided to reduce the gas pressure within the breaker to a value
not exceeding 8 millibars within 4 hours or less.
4.13) Sufficient SF6 gas shall be provided to fill all the circuit breakers installed. In addition
to this 20% of the total gas requirement shall be supplied in separate cylinders as spare
12
requirement.
4.14) Provisions shall be made for attaching an operation analyzer after installation at site to
record contact travel, speed and making measurement of operation timings, pre-insertion
timing of closing resistor, synchronization of contacts in one pole.
4.15) The bidder shall furnish complete literature regarding assembly, maintenance and
charging procedures as applicable to SF6 breakers.
4.16) The supply shall cover necessary remote control switches, temperature compensated
gas pressure switches which shall give an alarm or lockout operation of the breakers in case
density of SF6 fall below a predetermined value or when the air pressure falls below the
present values.
4.17) The bidder shall provide the following spare parts for SF6 gas circuit breakers for each
breaker free of cost.
i) SF6 gas together 1 No. (Cylinder preferably 10 KG along with gas cylinder with
manufacture's certificate for quality of SF6 gas and certificate of explosive for cylinder)
ii) Trip coil 1 set
iii) Closing coil 1 set
4.18) One set of special tools, if any, required for assembly gas charging and maintenance of
the SF6 circuit breakers shall be supplied. The prices of the same may be quoted along with
list separately.
4.19) Tests :
Besides the tests on SF6 circuit breakers as per the latest IS/IEC, the certificate of following
tests shall be submitted for the SF6 gas:
a) Toxicity test
b) Moisture Test
c) Tests to determine the quantities of air, CF4 and free acid in the gas.
4.20 INSULATION OF THE CIRCUIT BREAKER:
4.20.1 The porcelain to be used in bushing shall be homogeneous, free from laminations,
cavities and other flaws which may impair its mechanical and/or dielectric strength and shall
be glossy, tough and impervious to moisture.
4.20.2 The bushings shall have adequate mechanical strength and rigidity for conditions
under which they will be used. Bushing insulation shall be coordinated with that of Circuit
Breaker. The puncture strength of the bushings shall be greater than the dry flashover value.
4.20.3 When operating at rated voltage and under operation in heavily polluted area, there
shall not be any electrical discharge between bushing terminal and earth. No radio
13
disturbance shall be caused by the bushings when operating up to the maximum system
voltage. It shall also be free from corona.
4.20.4 All iron parts shall be hot dip galvanised.
4.20.5 The basic insulation level of the bushings and insulating porcelain shall be as specified
and shall be suitable for installation in climatic conditions specified in of this specification.
The hollow insulators shall confirm to the latest edition of IS: 5621 or IEC publication no:
815 and 168.
4.20.6 All bushings of identical rating shall be interchangeable.
4.21 CONTACTS
4.21.1 All making and breaking contacts shall be sealed free from atmospheric effects. Contacts
shall be designed to have adequate thermal and current carrying capacity for the duty specified
and to have a life expectancy so that frequent replacements due to excessive burning will not be
necessary. Provision shall be made for rapid dissipation of heat generated by the arc on opening.
4.21.2 Main contacts shall be the first to open and the last to close so that there will be little
contact burning and wear.
4.21.3 If arcing contacts are used they shall be the first to close and the last to open. These shall
be easily accessible for inspection and replacement. If there are no separately mounted arcing
contacts the main contacts shall be easily accessible for inspection and replacements. Tips of
arcing contacts shall be made of Tungsten alloy/Graphite and main contacts shall be silver
plated or have tungsten alloy tipping.
4.21.4. Any device provided for voltage grading to damp oscillations or to prevent restrict prior
to the complete interruption of the circuit or to limit over-voltages on closing shall have a life
expectancy comparable to that of the breaker as a whole.
4.21.5. Contacts shall be kept permanently under pressure of SF6 gas. The poles shall be
partially filled with SF6 gas at the time of dispatch and only topping upto required pressure shall
be permitted at site. The gap between the open contacts shall be such that it can withstand atleast
the rated phase to ground voltage continuously at zero gauge pressure of SF6 gas due to its
leakage.
4.21.6. Specific guarantee that the SF6 gas will not leak more than 1% per year from the breaker
for a minimum period of 10 years from supply or commissioning whichever is later shall be
given. If leakage of SF6 gas occurs beyond this limit within 10 years the defects in the breaker
shall be attended to by the company free of cost and this shall be done irrespective of the number
of leakages during the period of 10 years. The defect shall be rectified within 7 days from the
date of intimation (by Fax, Cable, Telephone) including travel time of the service personnel.
14
If the defects due to which the gas leak occurs, are not attended by the bidder within 7 days, the
cost towards the quantum of gas to be refilled due to the defective system, shall be recovered
from their running bills or shall be made good by the bidder.
4.21.7. Special guarantee for interrupter:
The bidder should give a special guarantee for interrupter for 5 years from the date of supply or
commissioning whichever is later. Free replacement, if fails during five years period.
The bidder would not confirm on Clause 4.21.6 and Clause 4.21.7 shall be treated as nonresponsive.
4.22 OPERATING MECHANISM AND ASSOCIATED EQUIPMENTS
4.22.1. The circuit breakers shall be designed for electrical local as well as remote control. In
addition there shall be provision for local mechanical control (emergency trip).
4.22.2. The operating mechanism for 245 kV SF6 Circuit Breakers shall be spring charging
type by electric control. The mechanism shall be adequately designed for the specified tripping
and re-closing duty. The entire operating mechanism control circuitry, spring charge motor for
spring mechanism Circuit Breaker etc., as required, shall be housed in an outdoor type, CRCA
steel enclosure. This enclosure shall conform to degree of protection of IP-55 if IS-2147.The
enclosure shall be invariably mounted on mounting tail at CPRI High power loboratory. In case
of painted enclosures, the housing shall be painted with shade 631 of IS-5 i.e. epoxy light gray.
All interiors and exteriors of the housing shall be thoroughly cleaned to remove all rust, scales,
corrosion, grease and other adhering foreign matter and the surface treated by recognized
phosphating (i.e. seven tank phosphating sequence). After such preparation of surfaces, two
coats of Zinc Oxide primer shall be given by suitable stoving and air drying before final
painting. The final painted cubicle shall present aesthetically pleasing appearance free from any
dent or uneven surface. Painting inside the metallic housing shall be of anti-condensation type
and the paint on outside surface shall be suitable for outdoor installation.
4.22.3. All working parts in the mechanism shall be of corrosion resistant material. All bearings
which require greasing, shall be equipped with pressure grease fittings.
4.22.4. The design of the operating mechanism shall be such that it shall be practically
maintenance free for a minimum period of ten (10) years from the date of installation under all
operating conditions. The guaranteed years of maintenance free operation, the number of full
load and full rated short circuit current breaking/operation without requiring any maintenance or
overhauling shall be clearly stated in the bid. As far as possible the need for lubricating the
operating mechanism shall be kept to the minimum and eliminating altogether if possible.
15
4.22.5. The operating mechanism shall be non-pumping (and trip free). There shall be no
rebounds in the mechanism and it shall not require any critical adjustments at site. Operation of
the power operated closing device, when the circuit breaker is already closed shall not cause
damage to the circuit breaker or endanger the operator. Provision shall be made for attaching an
operation analyser to facilitate testing of breaker at site.
4.22.6. A mechanical indicator shall be provided to show open and close positions of the
breaker. It shall be located in a position where it will be visible to a man standing on the ground
level with the mechanism housing closed and operation counter shall also be provided in the
central control cabinet.
4.22.7. The Bidder shall furnish detailed operation and maintenance manual of the mechanism
along with operation manual for the circuit breakers.
4.22.8. MOTOR COMPRESSED SPRING CHARGING MECHANISM:
a) Spring operated mechanism shall be complete with motor, opening spring, closing spring and
all other necessary accessories to make the mechanism a complete unit. Breaker operation shall
be independent of motor which shall be used solely for the purpose of charging the closing
spring.
b) Motor rating shall be such that it requires only 15 seconds or less for fully charging the
closing spring. Closing operation shall compress the opening spring and keep ready for tripping.
The mechanism shall be provided with means for charging the spring by hand. This operation
shall be carried out with the doors of the cubicle open. During this process no electrical or
mechanical operation of the mechanism shall endanger the operator or damage the equipment. A
mechanical indicating device shall be provided to indicate the state of the charge of the spring
and shall be visible with the door of the cubicle closed. An alarm shall be provided for indicating
spring failing to be charged by a pre-set timer after circuit breaker closing.
c) The spring mechanism shall be fitted with a local manual release, preferably by a push
button to avoid inadvertent operation. Means shall be provided for discharging the spring
when the circuit breaker is in the open position without circuit breaker attempting to close.
4.22.9 OPERATING MECHANISM HOUSING:
The operating mechanism housing/control cabinet shall conform to the requirement specified in
clause 4.24.
4.23 CONTROL
16
4.23.1. The close and trip circuits shall be designed to permit use of momentary contact switches
and push buttons.
4.23.2. Each breaker pole shall be provided with two (2) independent tripping circuits, valves
and coils each connected to a different set of protective relays.
4.23.3. The breaker shall normally be operated by remote electrical control. Electrical tripping
shall be performed by shunt trip coils. However, provisions shall be made for local electrical
control. For this purpose a local/remote selector switch and close and trip push buttons shall be
provided in the breaker central control cabinet. Remote located push buttons and indicating
lamps shall be provided by the Purchaser.
4.23.4. The trip coils shall be suitable for trip circuit supervision. The trip circuit supervision
relay would be provided by the Purchaser. Necessary terminals shall be provided in the central
control cabinet of the circuit breaker by the Bidder.
4.23.5. Closing coil shall operate correctly at all values of voltage between 85% and 110% of
the rated voltage. Shunt trip shall operate correctly under all operating conditions of the circuit
breaker upto the rated breaking capacity of the circuit breaker and at all values of supply voltage
between 70% and 110% of rated voltage.
4.23.6. Suitable relay for monitoring of DC supply voltage to the control cabinet shall be
provided. The pressure switches used for interlock purposes shall have adequate contact ratings
to be directly used in the closing and tripping circuits. In case the contacts are not adequately
rated and multiplying relays are used then the interlock for closing/opening operation of breaker
shall be with "NO" logic of the relay i.e. if the DC supply to the interlock circuit fails then it is
essential that breaker trips in order to protect the switch gear and connected equipment like
transformers etc., for any possible faults at that time. Provision for automatic tripping of the
breaker shall be made along with the flag indication for non-availability of DC supply. The
connection must be such that capacitor provided for this purpose gets charged from the DC
source provided by the Board only and the capacitor supply is released for the tripping circuit as
soon as DC supply fails. It must be possible to close the breaker only after restoration of DC
supply. The entire arrangement of CTD (Capacitor Tripping Device ) facility shall be mounted
on control cubicle for 220 kV SF6 Circuit Breakers.
4.23.7. A local manual closing device which can be easily operated manually by one standing
on the ground shall also be provided for maintenance purposes and direction of motion of handle
shall be clearly marked for the spring operating mechanism of Circuit Breaker.
4.23.8. The auxiliary switch of the breaker shall be preferably positively driven by the breaker
operating rod and where due to construction features, same is not possible a plug-in device shall
17
be provided to simulate the opening and closing operations of circuit breaker for the purpose of
testing control circuits.
4.24 SPECIFICATION FOR CONTROL CABINETS
4.24.1. Control cabinets shall be of the free standing floor mounting out door type.
4.24.2. Control cabinets shall be sheet steel enclosed and shall be dust, weather and vermin
proof. Sheet steel shall be atleast 3.0 mm. thick . 15 mm. thick neoprene or better type of gaskets
shall be provided to ensure degree of protection of atleast IP 55 as per IEC:60947. Control
cabinets shall be provided with hinged door and padlocking arrangement. The door hinges shall
be of union joint type to facilitate easy removal. Door shall be properly braced to prevent
wobbling. There shall be provision in the bottom sheet for entrance of cables from below.
4.24.3. Equipment and devices shall be suitable for operation on a 415 V, 3 phase 3/4 wire 50
Hz. AC system. The wiring shall be of stranded copper with minimum cross section of 2.5
sq.mm. with 1100 V PVC insulation.
4.24.4. Bus bars shall be of tinned copper of adequate cross-section to carry the normal current,
without exceeding the permissible temperature rise over an ambient temperature of 50 deg.C.
outside the cubicle. The buses shall be braced to withstand forces corresponding to short circuit
current of 10 kA.
4.24.5. Motors rated 1 kW and above being controlled from the control cabinet shall be suitable
for operation on a 415 V, 3 phase 50 Hz. system. Fractional kW motors shall be suitable for
operation on a 240 V, 1-phase, 50 Hz. supply system.
4.24.6. Isolating switches shall be group operated units Quick make quick break type, capable of
breaking safely and without deterioration, the rated current of the associated circuit. Control
cabinet door shall be interlocked with the operating handle of the switch so as to prevent
opening of the door when the switch is closed. A device for bypassing the door interlock shall
also be provided. Switch handle shall have provision for locking in both fully open and fully
closed positions.
4.24.7. Fuses shall be HRC cartridge link type having prospective current rating of not less than
46 kA (rms). They shall be provided with visible operation indicators to show when they have
operated. One fuse pulling handle shall be supplied for every ten fuses or a part thereof.
4.24.8. Push button shall be rated for not less than 6 Amps. 240 V AC or 2 Amps, 220 V DC and
shall be flush mounted on the cabinet door and provided with appropriate name plates. Red,
Green and Amber indicating lamps shall be flush mounted and provided with series resistors to
eliminate the possibility of short circuiting of control supply in the event of fusing of lamps.
4.24.9. For motors upto 5 kW, contactor shall be direct-on-line, air break, single throw type and
shall be suitable for making and breaking the starting current of the associated motor which shall
18
be assumed equal to 6.5 times the full load current of the motor at 0.2 p.f. For motors above 5
kW, automatic star delta type starters shall be provided. 3 pole contactor shall be furnished for 3
phase motors and 2 pole contactor for single phase motors. Reversing contactor shall be
provided with electrical interlocks between forward and reverse contactor. If possible,
mechanical interlocks shall also be provided. contactor shall be suitable for uninterrupted duty
and shall be of duty category class AC4 as defined in IEC:60947. The main contacts of the
contactor shall be silver plated and the insulation class for the coils shall be class E or better. The
dropout voltage of the contactor shall not exceed 70% of the rated voltage.
4.24.10. Contactor shall be provided with a three element, positive acting, ambient temperature
compensated, time lagged, hand reset type thermal overload relay with adjustable setting. Hand
reset button shall be flush with the front door of the cabinet and suitable for resetting with starter
compartment door closed. Relays shall be either direct connected or CT operated depending on
the rated motor current.
4.24.11. Single phasing preventor relay shall be provided for 3 phase motors to provide
positive protection against single phasing.
4.24.12. Mini starters shall be provided with no volt coils wherever required.
4.24.13. All necessary cable terminating accessories such as glands, crimp type tinned copper
lugs etc., for control cables shall be included in Bidder's scope of supply. Suitable brass cable
glands shall be provided for cable entry.
4.24.14. Wiring for all control circuits shall be carried out with 1100/650 volts grade PVC
insulated tinned copper stranded conductors of sizes not smaller than 2.5 sq.mm. Atleast 10%
spare terminal blocks for control wire terminations shall be provided on each panel. The
terminal blocks shall be ELMEK type or equivalent. All terminals shall be provided with
ferrules indelibly marked or numbered and these identifications shall correspond to the
designations on the relevant wiring diagrams. The terminals shall be rated for adequate capacity
which shall not be less than 10 Amps.
4.24.15. Control cabinet shall be provided with 240 V, 1-phase 50 Hz, 20 W fluorescent light
fixture and 5 Amps. 3 pin socket for hand lamp.
4.24.16. Space heaters shall be provided inside each cabinet complete with thermostat
(preferably differential type) to prevent moisture condensation. Heaters shall be controlled by
suitably rated double pole miniature circuit breakers.
4.24.17. Signal lamps provided shall be of neon screw type with series resistors, enclosed in
bake lite body. Each signal lamp shall be provided with a fuse integrally mounted in the lamp
body.
19
4.24.18. All AC control equipment shall be suitable for operation on 240 V, 1 phase 50 Hz.
system.
4.24.19. Items inside the cabinet made of organic material shall be coated with a fungus resistant
varnish.
4.24.20. All doors, panels, removable covers and breaker openings shall be gasketed all around.
All louvers shall have screens and filters. Cabinets shall be dust, moisture and vermin proof.
4.25 INTERLOCKS
It is proposed to electrically interlock the circuit breaker with Purchaser's associated air break
isolating switches in accordance with switchyard safety interlocking scheme. All accessories
required on breaker side for satisfactory operation of the scheme shall be deemed to be included
in the scope of supply of this Specification.
4.26 SUPPORT FITTINGS AND STRUCTURE
The Bidder shall include the price of support structure along with the foundation bolts required
in the bid proposal sheet and these shall be considered in evaluation. The support structure shall
meet the following requirements.
4.26.1. The minimum vertical clearance from any energized metal part to the bottom of the
circuit breaker (structure) base, where it rests on the foundation pad, shall be as per the principal
parameters clause – 3.5 in this specification.
4.26.2. The minimum vertical distance from the bottom of the lowest porcelain part of the
bushings, porcelain enclosures or supporting insulators to the bottom of the circuit breaker base,
where it rests on the foundation pad shall be 2.55 meters for all voltages.
4.27 ACCESSORIES
4.27.1. Following is the major fittings and accessories to be furnished by Bidder in the central
control cabinet.
a) Central control cabinet in accordance with clause No.4.24 complete with:
i) Cable glands for the following sizes of cables tentatively proposed.
2 x 4 sq.mm. Al. cable
4 x 4 sq.mm. Al. cable
6 x 4 sq.mm. Al. cable
2 x 2.5 sq.mm. Cu. cable
4 x 2.5 sq.mm. Cu. cable
20
6 x 2.5 sq.mm. Cu. cable.
10 x 2.5 sq.mm. Cu. cable.
ii) Local/remote changeover switch.
iii) Four digit operation counter.
v) Control switches to cut off control power supply.
vi) Fuses and links as required.
vii) The number of terminals provided shall be adequate enough to wire out all contacts and
control circuits plus 24 terminals spare for Purchaser's use.
viii) Operation hour meter for motor.
ix) Three pin plug with socket.
x) Illuminating lamp with door switch.
xi) Lock and key for mechanism box.
xii) Capacitor tripping device.
xiii) Thermostatically controlled space heater.
xiv) Antipumping arrangement in the closing circuit.
b) Anti-pumping relay.
c) Rating and diagram plate in accordance with IEC incorporating year of manufacture.
.
4.28 SURFACE FINISH
4.28.1. All interiors and exteriors of tanks, control cubicles and other metal parts shall be
thoroughly cleaned to remove all rust, scales, corrosion, greases or other adhering foreign
matter. All steel surfaces in contact with insulating oil, as far as accessible, shall be painted with
not less than two coats of heat resistant, oil insoluble, insulating paint.
4.28.2. All metal surfaces exposed to atmosphere shall be given two primer coats of zinc
chromate and two coats of epoxy paint with epoxy base thinner. All metal parts not accessible
for painting shall be made of corrosion resisting material. All machine finished or bright surfaces
shall be coated with a suitable preventive compound and suitably wrapped or otherwise
protected. All paints shall be carefully selected to withstand tropical heat and extremes of
weather within the limits specified. The paint shall not scale off or wrinkle or be removed by
abrasion due to normal handling. All external paintings shall be as per shade No.631 of IS:5.
4.28.3. All ferrous hardware, exposed to atmosphere, shall be hot dip galvanised.
21
4.29 GALVANISING
All ferrous parts including all sizes of nuts, bolts, plain and spring washers, support channels,
structures, shall be hot dip galvanised conforming to latest version of IS:2629 or any other
equivalent authoritative standard.
4.30 EARTHING
The operating mechanism housing, control cabinets, dead tanks, support structure etc., shall be
provided with two separate earthing terminals suitable for bolted connection to 50x8mm.
Galvanised MS flat to be provided by the Purchaser for connection to station earth mat.
4.31 NAME AND RATING PLATES:
4.31.1. Circuit breaker and its operating device shall be provided with a rating plate or plates
marked with but not limited to following data:
a) Manufacturer's or trade mark.
b) Serial number or type designation making it possible to get all the relevant information from
the manufacturer.
c) Year of manufacture.
d) Rated voltage.
e) Rated insulation level.
f) Rated frequency.
g) Rated normal current.
h) Rated short circuit breaking current.
i) First pole to clear factor.
j) Rated duration of short circuit.
k) Rated auxiliary DC supply voltage of closing and opening devices.
l) Rated pressure of compressed air gas for operation and interruption.
m) Rated out of phase breaking current.
n) Rated supply voltage of auxiliary circuits.
o) Rated supply frequency of auxiliary circuits.
p) Purchase order number and customer's name.
4.31.2. The coils of operating devices shall have a reference mark permitting the data to be
obtained from the manufacturer.
4.31.3.The rating plate shall be visible in position of normal service and installation. The rating
plate shall be weather proof and corrosion proof.
22
4.32 LIMITS OF TEMPERATURE RISE
The temperature rise on any part of equipment shall not exceed the maximum temperature rise
specified below under the conditions specified in test clauses.
Sl. No.
Nature of the part or of the
liquid
Maximum value of
Temperature
1.
2.
3.
4.
5.
Contacts in air, silver faced
copper, copper alloy or aluminum
alloy(see notes (i)&(ii) Bare
copper or tinned Al. alloy
Contacts in oil:
Silver faced copper, copper
alloy or aluminum alloy (see noteii) Bare copper or tinned Al. alloy
105
Temperature rise at a max.
ambient air temp. not
exceeding 50 deg. C.
55
75
25
90
40
80
30
Terminals to be connected to
external conductors by screws or
bolts silver faced (see note-iii)
105
55
Metal parts acting as springs
(See note iv)
Metal parts in contact with
insulation of the following classes:
Class Y : (for non-impregnated
materials)
Class A : (for materials immersed
in oil or impregnated)
90
40
100
90
Class E : in air
in oil
120
100
70
50
Class B: in air
in oil
130
100
80
50
Class F : in air
in oil
enamel: Oil base
Synthetic in air
155
100
100
120
105
50
50
70
23
6.
7.
Synthetic in oil
Any part of metal or of insulating
material in contact with oil, except
contacts.
Oil
100
100
50
50
100
50
Notes:
i) When applying the temperature rise of 55 deg.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 points 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 deg.C.
4.33 MOTORS
Motors shall be "Squirrel Cage" three phase induction motors of sufficient size capable of
satisfactory operation for the application and duty as required for the driven equipment.
4.34 SULPHUR HEXAFLUORIDE GAS (SF6 GAS)
a) The SF6 gas shall comply with IEC-376, 376A and 376B and be suitable in all respects for
use in the switch gear under the worst operating conditions.
b) The high pressure cylinders in which the SF6 gas is shipped and stored at site shall comply
with requirements of the following standards and regulations:
i) IS:4379 -
Identification of the contents of industrial gas cylinders.
ii) IS:7285- Seamless high carbon steel cylinders for permanent and high
pressure liquifiable gases.
The cylinders shall also meet Indian Boiler Regulations.
c) Test: SF6 gas shall be tested for purity, dew point, breakdown voltage, water contents as per
IEC-376, 376A and 376B and test certificates shall be furnished to Purchaser indicating all the
tests as per IEC376 for each lot of SF6 gas.
24
4.35 DUTY REQUIREMENTS
4.35.1. The circuit breakers shall be totally re-strike free under all duty conditions and shall be
capable of performing specified duties without opening resistors.
4.35.2. The circuit breakers shall meet the duty requirements for any type of fault or fault
location, for line charging and dropping when used on an effectively grounded system and
perform make and break operations as per stipulated duty cycles satisfactorily.
4.35.3. The circuit breakers shall be capable of:
i) Interrupting the steady and transient magnetizing current corresponding to 220 kV class
transformers of 100 MVA and rating respectively.
ii) Interrupting line charging current as given in clause 3.5, "Principal Parameters" of this
specification with a temporary over voltage as high as 1.5 p.u. without re-strikes and without use
of opening resistors.
iii) Clearing short line faults (Kilometric faults) with source impedance behind the bus,
equivalent to symmetrical fault current specified.
iv) Breaking inductive currents of 0.5 to 10 A without switching over voltage exceeding 2.0 p. u.
v) Breaking 25% of the rated fault current at twice rated voltage under phase opposition
condition.
4.35.4. The critical current which gives the longest arc duration at lockout pressure of
extinguishing medium and the arc duration shall be indicated.
4.35.5. The breakers shall satisfactorily withstand the high stresses imposed on them during fault
clearing, load rejection and re-energisation of lines with trapped charges. The breakers shall also
withstand the voltage specified in clause 3.5 "Principal Parameters" of the specification.
4.36 TOTAL BREAK TIME
4.36.1. The "Total Break Time" as specified in clause 3.5, "Principal Parameters" of this section
shall not be exceeded under any of the following duties:
i) Test duties T10,T30,T60, T100s and T100a (with TRV as per IEC-62271-100).
ii) Short line fault L90, L75 (with TRV as per IEC-62271-100).
4.36.2. The bidder may please note that there is only one specified break time of the breaker
which shall not be exceeded under any duty conditions specified such as with the combined
variation of the trip coil voltage. The proof for the total break time of complete circuit breaker
shall be furnished.
4.36.3. The values guaranteed shall be supported with the type test reports.
25
4.37 ADDITIONAL REQUIREMENTS
4.37.1. The circuit breakers shall be single pressure type and single break. The design and
construction of the circuit breaker shall be such that there is minimum possibility of gas leakage
and entry of moisture. There should not be any condensation of SF6 gas on the internal
insulating surface of 220 kV SF6 circuit breakers.
4.37.2. All gasket surfaces shall be smooth, straight and reinforced, if necessary to minimize
distortion and to make a tight seal. Where the operating rod of the operating mechanism
connected to the arc chamber (SF6 media) adequate O-ring seals shall be provided.
4.37.3. In the interrupter assembly there shall be an absorbing product box to eliminate SF6
decomposition products and moisture. The material used in the construction of the 220 kV SF6
circuit breakers shall be fully compatible with SF6 gas.
4.37.4. Each pole of 220 kV SF6 Circuit Breakers shall form an enclosure filled with SF6 gas
independent of the other two poles. The SF6 gas density of each pole shall be monitored and
regulated by pressure switches .
4.37.5. The SF6 gas density monitor of 220 kV kV SF6 Circuit Breakers shall be adequately
temperature compensated. The density monitor shall meet the following requirements:
i) It shall be possible to dismantle the density monitor for checking/replacement without
draining the SF6 gas by using suitable interlocked non-return couplings.
ii) It shall damp the pressure pulsation while filling the gas in service so that the flickering of the
pressure switch contacts does not take place.
iii) A pressure indicator shall also be supplied.
iv) The alarm and trip setting shall be such that:
a) Advance warning can be given for the low pressure below an unacceptable level.
b) After alarm, the breaker shall open if the pressure falls below pre-determined value.
4.37.6. Means for pressure relief shall be provided in the gas chamber of circuit breaker to avoid
damages or distortion during occurrence of abnormal pressure increase or shock waves
generated by internal electrical faults, if required for the Circuit Breakers design. The position
of pressure relief devices shall be so arranged as to minimize danger to the operators in the event
of gas or vapour escaping under pressure.
4.37.7. Sufficient SF6 gas for 220 kV SF6 Circuit Breakers shall be provided to fill all the circuit
breakers installed. In addition to this 20% of the total gas requirement shall be supplied in
separate cylinders as spare requirement.
4.37.8. Provisions shall be made for attaching an operation analyzer after installation at site to
record contact travel, speed and making measurement of operation timings and synchronization
of contacts in one pole.
26
V. TESTS
5.1 TYPE TESTS
5.1.1. All the equipment offered, shall be fully type tested by the bidder as per the relevant
standard. The bidder shall furnish one set of the following type test reports for each equipment
offered along with bid. The type tests must have been conducted not earlier than five years form
the date of bid opening.
i) Mechanical Endurance Test (M2).
ii) Power frequency voltage withstand tests (wet & dry)
iii) Lightning Impulse withstand test.
iv) Basic short circuit tests, short line fault test duties and out – of phase switching tests.
v) Short time withstand current and peak withstand current tests.
vi) Line and cable charging current tests.
vii) Temperature rise test.
viii) Seismic withstand test.
ix) Capacitive current switching tests.
x) RIV (Radio Interference ) Voltage Test. (for 220 kV SF6 Circuit Breakers only)
5.1.2. The Bidder shall indicate the costs for conducting the following type tests. Cost for each
type test shall be indicated clearly.
i) Mechanical Endurance Test
ii) Power frequency voltage withstand tests (wet & dry)
iii) Lightning Impulse withstand tests.
iv) Temperature rise tests.
v) Seismic withstand tests.
vi) RIV (Radio Interference Voltage) Tests.
5.2 ACCEPTANCE AND ROUTINE TESTS
5.2.1. All acceptance and routine tests as stipulated in the relevant standards shall be carried out
by the Supplier in the presence of Purchaser/Purchaser's representative.
Once the breaker is installed one full current shot of 50kA at 245kV TRV and 5kA at
245kV TRV will be taken on the breaker using the synthetic test facility, the breaker
should not show any restrikes, any restrike supplier has to replace the breaker free of cost.
5.2.2. In addition to the mechanical and electrical tests specified by IEC, the following shall also
be performed. Speed curves for each breaker shall be obtained with the help of a suitable
27
operation analyzer to determine the breaker contact movement during opening, closing, auto-reclosing and trip free operation under normal as well as limiting operating conditions (control
voltage,etc.). The tests shall show the speed of contacts directly at various stages of operation,
travel of contacts, opening time, closing time, shortest time between separation and meeting of
contacts at break/make operation etc. This test shall also be performed at site for which the
necessary operation analyzer along with necessary transducers, cables, console, etc., shall be
furnished as mandatory maintenance equipment.
5.2.3. Immediately after finalisation of the programme 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.
5.3 ADDITIONAL TESTS
The Purchaser reserves the right for carrying out any other tests of a reasonable nature at the
works of the Supplier/laboratory or at any other recognised 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 with the intent of this specification.
VI. INSPECTION
6.1. The inspection may be carried out by the Purchaser at any stage of manufacture. The
Supplier shall grant free access to the Purchaser/Purchaser's representative at a reasonable time
when the work is in progress. Inspection and acceptance of any equipments under this
specification by the Purchaser shall not relieve the Supplier 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.
6.2. The supplier shall keep the Purchaser informed in advance, about the manufacturing
programme so that arrangement can be made for inspection.
6.3. The Purchaser reserves the right to insist on witnessing the acceptance/routine testing of the
bought out items.
6.4. No material shall be dispatched from its point of manufacture unless the material has been
satisfactorily inspected and tested.
6.5. The supplier shall give 15 days (for local supplies)/ 30 days. (In case of foreign supplies)
advance, intimation to enable the purchaser to depute his representative for witnessing
acceptance and routine tests.
28
All charges in connection with inspection by purchaser's personal such as travel,
accommodation and incidentals shall be borne by the Purchaser.
VII. QUALITY ASSURANCE PLAN
7.1 The bidder shall invariably furnish the following information along with his offer
failing which the offer shall be liable for rejection. Information shall be separately
given for individual type of equipment offered.
i) The Structure of organization
ii) The duties and responsibilities assigned to staff ensuring quality of work
iii) The system of purchasing, taking delivery and verification of materials
iv) The system for ensuring quality of workmanship
v) The quality assurance arrangements shall confirm to the relevant requirement of ISO-9001 on
ISO 9002 as applicable.
vi) Statement giving list of important raw materials, names of sub-supplies for the raw materials,
list of standards according to which the raw material are tested, list of tests normally carried out
on raw material in the presence of suppliers representative, copies of test certificates.
vii) Information and copies of test certificates as on (i) above in respect of
bought out items.
viii) List of manufacturing facilities available
ix) Level of automation achieved and list of areas where manual processing exists.
x) List of areas in manufacturing process, where stage inspections are normally carried out
for quality control and details of such tests and inspections.
xi) List of testing equipment available with the bidder for final testing of equipment specified
and test plant limitation. Special acceptance and routine tests specified in the relevant
standards. These limitations shall be very clearly brought out in "Schedule of Deviations"
from the specified test requirements.
7.2. The Contractor shall within 30 days of placement of order, submit the following information
to the purchaser.
i) List of the raw material as well as bought out accessories and the names of sub-suppliers
selected from those furnished along with the offer.
ii) Type test certificates of the raw material and bought out accessories if required by the
purchaser.
29
iii) Quality Assurance Plan (QAP) with hold points for purchasers inspection. QAP and
purchasers hold points shall be discussed between the purchaser and contractor before the QAP
is finalised.
The contractor shall submit the routine test certificates of bought out accessories and central
excise asses for raw material at the time of routine testing if required by the purchaser and
ensure that the quality assurance requirements of specification are followed by the subcontractor.
7.3 The Quality Assurance Programme shall give a description of the Quality System and
Quality Plans with the following details.
i) Quality System:

The Structure of the Organisation

The duties and responsibilities assigned to staff ensuring quality of work.

The system of purchasing, taking delivery of verification of materials.

The system of ensuring of quality workmanship.

The system of control of documentation.

The system of retention of records.

The arrangement of contractor internal auditing.

A list of Administrator and work procedures required to achieve contractors quality
requirements. These procedures shall be made readily available to the purchaser for
inspection on request.
ii) Quality Plans:

An outline of the proposed work and program sequence.

The structure of contractors organizations for the contract.

The duties and responsibilities ensuring quality of work

Hold and notification points.

Submission of engineering documents required by this specification.

The Inspection of the materials and components on request.

Reference to contractors work procedures appropriate to each activity.

Inspection during fabrication/construction.

Final inspection and test.
7.4. Training of Personnel:
The contractor shall provide necessary facilities for training personnel at their works/principals
works relating to design, manufacture, assembly and testing and operation maintenance for six
30
personnel free of cost. However, travel and incidental charges of the personnel will be borne by
the purchaser.
VIII. PACKING AND FORWARDING &UNLOADING
The equipment shall be packed in suitable crates so as to withstand handling 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 materials 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 the Supplier without
any extra cost. 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 and spare material.
The Supplier shall ensure that the packing list and bill of material are approved by the Purchaser
before despatch.
The Supplier shall arrange for unloading the material/equipment at his cost.
IX. QUANTITY AND DELIVERY REQUIREMENTS
i) Two numbers of 245kV SF6 Single pole Circuit breakers.
ii) The scope of supply shall include supply of 25% extra-quantity of bolts, nuts, washers, split
pins, cotter pins and such other small loose items free of cost.
X. SUPERVISION SERVICES
The supplier is expected to provide services of qualified personnel for the supervision of
erection, testing at site and commissioning the breakers supplied at free of cost.
XI. MANDATORY SPARES AND TOOLS
Mandatory spares and tools as mentioned in Price Schedule shall also be included in the scope
31
** The price for the same including on site delivery shall be shown separately in the price bid
XII. GUARANTEED TECHNICAL PARAMETERS
The Guaranteed Technical particulars for the equipment being supplied shall be provided with
the Bid as specified in this technical specification at Annexure-I. The Bids received without
guaranteed technical particulars shall be treated as Non-responsive.
32
Annexure-I
GUARANTEED TECHNICAL PARTICULARS FOR 220 kV SF6 CIRCUIT BREAKER
Particulars
S.NO
Description
220 kV SF6 CBs
1.
2.
a) Maker's name country
of manufacture.
b) Manufacturer's type designation.
Applicable Technical Standards
3.
a) Rated voltage (kV)
b) Rated Frequency (Hz)
4.
Number of Poles
5.
Class (Outdoor/Indoor)
6.
Rated normal current:
a) Under site conditions (A)
b) Rated (A)
7.
Rated short circuit breaking current:
a) R.M.S. value of A.C.
component of rated short circuit
current (kA)
b) Percentage DC component
c) Asymmetrical breaking current
(including DC component)
d) Certificate or report no.
e) Oscillogram no.
8.
Rated short circuit making current
(kA)
First Pole to clear factor
9.
10.
12.
Rated transient recovery voltage for
terminal faults (kV peak)
Rated characteristics for short line
faults.
Rated operating sequence .
13.
Rated duration of short circuit (sec.)
11.
33
14.
15.
16.
Rated out of phase breaking current
(kA)
Opening time (ms)
Arcing time (ms)
a) At 10% rated breaking current
b) At 25% rated breaking current
c) At 50% rated breaking current
d) At 100% rated breaking current
17.
e) Maximum Arcing time at lowest
fault currents
Break time (ms)
a) At 10% rated breaking current
b) At 25% rated breaking current
c) At 50% rated breaking current
d) At 100% rated breaking current
18.
19.
20.
21.
22.
23.
24.
25.
e) Maximum break time at lowest fault
current
Closing time (ms)
Maximum Pole discrepancy time:
a) Opening (ms)
b) Closing (ms)
Rated line charging breaking current
(kA)
Maximum cable charging current
a) On supply side
b) On line side
Rated small inductive breaking
current (kA)
Max. rise of temperature over ambient
temperature for current rating under
clause 6.
Interrupting capacity based on duty
cycle as per clause 11.
a) AC Component (kA)
b) Percentage D.C. Component
Latching current (kA)
34
26.
27.
28.
29.
30.
31.
No of breaks in series per pole
Length of contact travel (mm)
Total length of break per pole (mm)
Rate of contact travel :
a) At tripping (meters/sec.)
b) At closing (meters/sec.)
Type of devices, if any, used to obtain
uniform voltage distribution between
breaks
Recovery
voltage
distribution
between breaks in percent of rated
voltage:
35.
a) Single line to ground fault
b) Interruption of short lines
c) Switching off an unloaded
Transformers
Type of main contact
Type of arcing-contacts and/or arc
control device
Material of contacts
a) Main
b) Arcing
c) Auxiliary
Whether contacts are silver plated
36.
Thickness of silver coating (mm)
37.
38.
Contact pressure (kg/sq. mm.)
Insulation level of the breaker :
a)1 minute power frequency withstand
voltage (kV rms)
b) Switching surge withstand
test
voltage (kV peak)
c) Impulse withstand test voltage (kV
peak)
d) Max. dynamic p.f. over
voltage
withstand (kV peak)
Minimum clearance in Air (mm)
a) Between Phases (live parts)
b) Between live parts and earth
c) Centre to centre distance between
phases
d) The safety boundaries during a
breaking operation for circuit breakers
32.
33.
34.
39.
35
40
41.
42.
43.
44.
45.
46.
47.
48.
49.
50.
with an external exhaust for ionized
gases or flames
Whether the circuit breaker is
suitable for fixed trip operation
or trip free operation and whether it is
provided with a lock-out device
preventing closing of the breaker
Method of closing
a) Normal
b) Emergency
Type of closing mechanism
a) Normal voltage of closing
b) Pick up range, (volts)
a) Normal voltage of closing
b) Pick up range, (volts)
c) Power at normal voltage of
closing mechanism, (watts)
d) Power at 85% of normal
voltage, (watts)
Type of tripping mechanism
Normal voltage of tripping coils,
(volts)
a) Power at normal voltage for
tripping coils, (watts)
b) Power at 70% normal voltage for
tripping coils, (watts)
Arc duration at 100% (ms)
Interruption capacity:
a) Opening Arcing time No. of loops
and time including resistor current
duration (cycle)
Resistor current duration, (cycle)
Total length of the arc, (mm)
Max. length of the arc, (mm)
Total interrupting time measured from
instant of trip coil energisation to arc
extinction of resistor current (cycles).
b) Closing time measured from instant
of application of power to closing
device up to arcing contacts touching,
(cycles).
Critical current (current giving the
longest arc when a break takes place)
(kA)
a) Recovery voltage when circuit
36
51.
52.
53.
54.
breaker tested at 100% rated breaking
capacity, (kV inst.)
b) Rate of rise of re-striking voltage at
breaking
i) For 30% breaking capacity,
(kV/Micro. sec.)
ii) For 100% breaking capacity,
(kV/Micro. sec.)
c)Maximum over voltage factor of the
circuit breaker when switching off.
i) Unloaded transformers.
ii) Loaded transformer
iii) Open circuited lines
When switching of synchronous
systems:
a) Max. current (kA)
b) Max. contacts of 1 pole (kV)
No. of openings the circuit breaker
is capable of performing without
inspection, replacement of contacts or
other main parts.
a) at 50% rated current
b) at 100% rated current
c) at current corresponding to
50% rated breaking capacity
d) at current corresponding to 100%
rated breaking capacity
a) Weight of complete circuit breaker
(kg.)
b) Impact loading for foundation
design, to include deed load plus
impact value on opening at maximum
interrupting ratings, in terms of
equivalent static load, (kg.)
c) Overall dimensions:
Height (mm)
Width (mm)
Length (mm)
Porcelain:
a)Make
b)Type
c)Descriptive pamphlet No.
d)Weight (kg.)
e)Transport dimensions, (mm)
f) Height above floor,required to
37
remove porcelain, (mm)
g) Insulation class
h) One minute dry power frequency
withstand,kV (r.m.s.)
i) 10 seconds wet power frequency
withstand,kV (peak)
j)Flash over voltage, (kV)
k)Full wave impulse withstand voltage
kV (peak)
l)Switching surge withstand voltage
(peak)
m)Corona discharge voltage, (kV
r.m.s.)
n) Nature of the dielectric
o) Creepage distance, total protected
(mm)
p) Volume of insulating medium per
porcelain (litres)
q)Permissible safe cantilever loading
on installed porcelain(kg.m.)
55.
Operating mechanism :
For stored energy mechanism :
1. Spring charging motor
i) Rating (kW)
ii) Voltage (V)
iii)Power frequency withstand voltage
kV.
iv)Time required for the motor to
charge the spring fully (Sec.)
v) Power required at the normal
control voltage to charge the spring Watts.
vi) Specification reference.
2.Spring closing/opening
i) Number of springs
ii) Type
iii) Number of turns
iv) Guage
v) External diameter mm.
vi) Stiffness
vii) Material
viii) Force developed in full charged
38
position.
ix) Specification reference.
56.
57.
58.
59.
60.
61.
62.
63.
64.
65.
66.
67.
68.
69.
70.
Rated pressure of SF6 gas in the
circuit breaker (kg/sq.cm)
Rated pressure of SF6 gas in the gas
cylinders (kg./sq.cm.)
Quantity of SF6 gas required per
single pole unit (kg.)
Quantity of SF6 gas per cylinder (kg.)
Weight of empty cylinder (kg.)
Quantity of absorbent required per
pole (kg.)
Recommended interval for renewal
of absorbent in case of outdoor
circuit breakers operating in tropical
conditions.
Chemical composition of absorbent
Quantity of absorbent covered in the
scope of supply (including spare
quantity) (kg.)
Limits of gas pressure for pressure
operation
of
circuit
breaker
(kg./sq.cm.)
Pressure and temperature at which the
temperature compensated gas pressure
switch
a) Alarm (kg./sq.cm., deg.C)
b) Cut off (kg/sq.cm. deg.C)
Name of SF6 supplier and country of
origin
Quantity of SF6 gas supplied for
a) Actual use in breakers (kg.)
b) As spare (kg.)
Chemical composition of gas:
a) Qty. of air by weight (ppm)
b)Qty. of H20 by weight (ppm)
c)Qty. of CF4 by weight (ppm)
d) Qty of free acid by weight (ppm)
No. of auxiliary contacts provided
a) Those close when breaker is closed.
b) Those open when breaker is closed.
c) Those adjustable with respect to the
position of main contacts.
39
71.
d) Continuous rating of contacts.
e) Breaking capacity of contacts.
Whether the equipment covered by
this Bid have been fully type tested
and if so, whether the copies of the
type test cert. enclosed to the bid offer.
Name of the firm
Signature of Bidder
..................
...............
Designation & Seal
Date
..............................
ACRONYMS
MVA
kVA
kV
Cu. mt
Deg. C
Mega Volt Ampere
Kilo Volt Ampere
Kilo Volt
Cubic meter
Degrees Centigrade
................
40
mm.
cm.
Dm.
km.
g.
kg.
V
Hz
DC
AC
ONAN
ONAF
HV
IV
Db
KA
sec.
Amps.
kVp.
kV. Rms.
KW
Max.
Min.
UTS
QAP
ACSR
AAAC
HP
ppm.
OLTC
WTI
OTI
Torr
LOI
CIF
CIP
SF6
TRV
CTD
ICU
NO
NC
sq.mm Al. Cable
sq.mm Cu. Cable
MS Flat
C
O
HRC
PVC
p.f
CT
Milli meter
Centi meter
Deci meter
Kilo meter
Grams
Kilo gram newton
Volts
Hertz
Direct Current
Alternate Current
Oil Natural Air Natural
Oil Natural Air Forced
High Voltage
Intermediary Voltage
Decibel
Kilo Ampers
Seconds
Amperes
Kilo volts peak
Kilo volts root mean square
Kilo watt
Maximum
Minimum
Ultimate Tensile Strenth
Quality Assurance Plan
Aluminium Conductor Steel Reinforced
All Aluminium Alloy Conductor
Horse Power
Parts Per Million
On Load Tap Change
Winding Temperature Indicator
Oil Temperature Indicator
Torr.
Letter of Intent
Cost including Insurance & Freight
Carriage Insurance Paid
Sulphur Hexa Flouride
Transient Recovery Voltage
Capacitor Tripping Device
Individual Compressor Unit
Normally Open
Normally Close
Square millimeter Aluminium cable
Square millimeter Copper cable
Mild Steel Flat
Close
Open
High Rupturing Capacity
Poly Vinyle Chloride
.Power factor
Current transformer
41
NCT
TEFC
P.U.
ISO
CB
Auto
kg./Sq.mm
T
Kn
Natural Current Transformer
Totally enclosed fan cooled
Per Unit
Indian Standard Organisation
Circuit Breaker
Automatic
Kilogram per square centimeter
Metric Tonn
Kilo Newtons