BIDDING DOCUMENT FOR SUPPLY OF

33kV SF6 CIRCUIT BREAKERS

NIT NO. AEGCL/MD/SS – 142

PRICE: Rs 500.00

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 MAIN CONTENTENTS

Notice Inviting Tenders

Section-1 Instruction to Bidders

Section-2 General technical information and requirements

Section-3 Technical Specification

Section-4 Guaranteed Technical Particulars

Section -5 Other Terms and conditions

Section -6 Price Schedule

 NOTICE INVITING TENDERS
Tender Specification No – AEGCL/M D/SS -142

The Managing Director, Assam Electricity Grid Corporation Limited, Bijulee Bhawan, Paltan
Bazar, Guwahati- 781001 vide bid reference No AEGCL/MD/ SS – 142 invites sealed bids from reputed
manufacturers or their authorised dealer for design, engineering, manufacture, testing/inspection at
manufacturer’s works before despatch, forwarding, packing, transporting and delivery of 4 nos. 33kV
SF6 Breakers for various substations of AEGCL in Assam. .

The bid documents may be obtained by the interested bidder on submission of a written
application along with necessary documents to the Managing Director. AEGCL, Bijulee Bhawan, Paltan
Bazar. Guwahati-1 on payment of non refundable fee of Rs 500.00 by crossed demand draft drawn in
favour of Managing Director, AEGCL The draft shall be payable at Guwahati . Sale of tender
documents will be started from 17th June 2009 and will be closed at 16 hrs of 25th June 2009.The last
date of submission of tenders is up to 14.00 hrs of 3rd July 2009 and opening at 14-30 hrs of 3rd July
2009.

Earnest money: - Rs 50,000.00 (Rupees fifty thousand) only to be submitted in the form of
Bank Guarantee.

The undersigned has the right to accept or reject any or all the bids without assigning any
reason thereof. The detailed terms and conditions shall be available at web site www. aegcl.co.in

Managing Director.
Assam Electricity Grid Corporation Limited.
Bijuli Bhawan. Paltan Bazar.

Memo No AEGCL/MD/ SS-142/1-a dtd. 13-06-09

Copy To:-
1. The Information and Public Relations Officers, ASEB, Bijulee Bhawan, Paltan Bazar .
Guwahati-1. He is requested to publish the NIT in one issue of at least 2 (two) local English
Dailies and one issue of the National Daily for wide circulation.

Managing Director, AEGCL.

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 SECTION – 1
INSTRUCTION TO BIDDERS

1.1.0 SCOPE OF CONTRACT:

The intention of this Specification is to cover design, manufacture, testing at manufacturer’s

works and delivery to destination of Circuit Breakers of 36kV voltage classes with all fittings
and accessories including mounting structures as specified in section of this specification.

1.1.1. The scope of work does not include erection and commissioning of the equipment, but if the
purchaser so desires, he may ask the services of the successful bidder to supervise the same.

1.2.0 CONTRACTOR TO INFORM HIMSELF FULLY:

The contractor should ensure that he has examined the General Conditions, Specifications and
Schedules as brought out in various section of the bid and has satisfied himself as to all the
conditions and circumstances affecting the contract price and fixed his price according to his
own views on these matters and acknowledge that no additional allowances except as
otherwise provided therein will be levied.

The purchaser shall not be responsible for any misunderstanding or incorrect information
obtained by the contractor other than information given to the contractor in writing by the
purchaser.

1.3.0 CONFORMITY WITH INDIAN ELECTRICITY RULES & OTHER REGULATIONS:

The contractor shall note that all equipments and materials shall comply with the latest
provisions of Indian Electricity Rules and with any other regulations as and where applicable.
Local authorities concerned in the administration of the rules and regulation relating to the
electric power installations shall be consulted, if necessary, in regard to the rules and
regulations that may be applicable.

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 SECTION –2

GENERAL TECHNICAL INFORMATION AND REQUIREMENTS

2.1.0. SCOPE
2.1.1. This specification covers design, engineering, manufacture, assembly and testing at
manufacturer’s works, packing, transporting and delivery to different consignees, duly insured
and supervises erection, testing and commissioning of 33 kV SF6 Circuit Breakers.
2.1.2. The scope of work does not include foundation and erection work. However, the purchaser if so
desires, he may ask the services of the successful bidder to supervise the same.

2.2.0. BIDDING
2.2.1. Each tender shall be accompanied by the following information with sufficient details to enable
the purchaser to make an appraisal of the quality and suitability of the material and equipment
offered.
a) Complete information required in the Technical bidding Schedule-Section -3 of this
specification.
b) Type test certificates of equipment of similar design from a Govt. recognised
laboratory
c) Manufacturer’s literature, brochures, catalogues etc.
d) List of customers to whom similar such equipment has been supplied.
e) Detail lists of successfully commissioned breakers of equivalent rating during the last
three years. Tenderer should note that failure to comply with the provision of this clause
might be sufficient reason to reject the bid.

2.3.0. CLIMATIC AND ISOCERAUNIC CONDITIONS

2.3.1. The climatic and isoceraunic conditions at site under which the equipment shall operate
satisfactorily are as follows:-
a) Maximum temperature of air in shade: 40º C
b) Minimum temperature of air in shade: 2º C
c) Maximum Humidity: 93%
d) Isoceraunic level: 60
e) Average of rainy days per annum: 150

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 f) Average number of days of thunderstorm per annum: 25
g) Average number of days of dust storm per annum: 10
h) Average annual rainfall: 2280 mm
i) Number of months of tropical monsoon per annum: 5(May to Sept.)
j) Maximum wind pressure: 150 Kg/sq. m.
k) Altitude (above mean sea level): 50 to 200m
2.3.2. The reference ambient temperatures assumed for the purpose of this specification are:
a) Maximum ambient temperature: 45ºC
b) Maximum average daily ambient temperature: 35ºC
c) Maximum average yearly ambient temperature: 30º C

2.4.0. STANDARDS
2.4.1. All the equipment supplied under this specification shall conform to the latest issue of relevant
Indian standards except where specified otherwise.
2.4.2. In the event of equipment conforming to any other standards, the salient features of
comparison shall clearly be set out in the tender.

2.5.0. TEST AND TEST CERTIFICATES

2.5.1. Type test certificates & results from a Govt. of India recognised institution as per the relevant
standards for the similar class and capacity equipment offered shall be furnished by the bidder
along with the tender. The Type test certificates should not be more than 5(five) years old.
2.5.2. The successful tenderer shall furnish to the purchaser Routine test certificates for prior
approval before despatch of any equipment from the works and the approval in writing from the
purchaser is essential to affect the despatch of the equipment. The test reports shall be
submitted completed with identification data including serial number of equipments.
2.5.3. Test shall be performed in presence of purchaser’s representative, if so desired by the
purchaser. The successful tenderer should give at least thirty days advance notice of the date
when the tests are to be carried out.

2.6.0. DRAWING, MANUALS, LITERATURES, ETC.

2.6.1. The successful tenderer shall be required to furnish all necessary drawings of the equipment
for approval of the purchaser.

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2.6.2. After approval of the drawings the successful tenderer shall submit to the purchaser for his
reference and record all the final drawings including the following manuals and /or instruction
booklets:-
a) Instruction books/ operation and maintenance manuals and spare parts
bulletin.
b) Descriptive literature along with illustrations for assembly, erection, testing and
commissioning.
c) Descriptive literature and data on construction of equipment.
The successful tenderer should submit
i) 6(six) copies of above mentioned drawings etc. to respective
consignee.
ii) 2(two) copies to DGM, Design (Tr), AEGCL.
iii) 1 (one) copy to DGM, MRT Circle. AEGCL.
iv) 1(one) copy to MD.AEGCL.
v) 1 (one) copy along with each equipment.
vi) All the drawings, manuals and literature shall form a part of scope
of the tender.

2.7.0. SPARE PARTS

2.7.1. The tenderer shall also furnish an item wise list of recommended spare parts and quantity for
five years satisfactory operation of the equipment with unit price of each part. Also, they will
submit an undertaking to supply these spares for a minimum period of 10(ten) years as and
when any request is made before them on a chargeable basis.

2.8.0. NAME PLATES

2.8.1. All equipment shall have non-corrosive name plates fix at a suitable position indelibly mark with
full particular there on in accordance with the standard adapted.
2.9.0. MOUNTING STRUCTURES
2.9.1. All the equipment covered under this specification shall be suitable for mounting on steel
structures. Supply of mounting structures is also in the scope of this tender.
2.9.2. Each equipment shall be furnished complete with base frame, anchor bolts, clamps, and
washers etc. and other hardware ready for mounting on steel structures.
2.9.3. Tenderer will also give full details of foundations for mounting structure.
2.10.0. SAFETY EARTHING

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2.10.1. The non-current carrying metallic parts and equipment shall be connected to station earthing
grid. For this two terminals suitable for 25mm X 4mm GI strip shall be provided on each
equipment.
2.11.0. TERMINAL CONNECTORS
2.11.1. The equipment shall be supplied with required number of terminal connectors of approved type
suitable for ACSR or AAA wolf or Equivalent conductors. Details of terminal connectors will be
furnished along with the purchase order.
2.12.0. COMPLETENESS OF TENDER
2.12.1. All fittings and accessories which may not be specifically mentioned in this specification but
those are usually necessary for the equipment of similar plant shall be specified and shall be
deemed to be included in the specification and shall be furnished by the tenderer without extra
charges.

2.13.0. LATENT DEFECTS, ERRORS AND OMISSIONS

2.13.1. Any latent defect, errors or omissions in the apparatus or part thereof not disclosed before the
final acceptance by the purchaser but revealed within one year after the apparatus is placed in
service shall be corrected promptly or the apparatus or part thereof shall be replaced by the
contractor free of charge. Expenses for the transportation handling and installation of such
replacement shall be borne by the contractor.

2.14.0. FAILURE TO MEET GUARANTEE & REQUIREMENT OF SPECIFICATION

2.14.1. Should the tests or the operation of any piece of apparatus under service conditions show that
it does not meet the guarantee and/or requirement of this specification the purchaser reserves
to himself the option to accept or reject the apparatus and to direct the contractor at once to
proceed to furnish such new parts as may be necessary to make apparatus to meet the
guarantee and the requirements. All expenses of furnishing and new installing new parts or
alternation of the existing parts, and all tests made necessary by failure of the apparatus to
meet the guarantee and other requirement of the specification shall be borne by the bidder.
2.14.2. If after installation, operation of the apparatus proves to unsatisfactory to the purchaser, the
purchaser shall have the right to operate the apparatus until it can be taken out by the
purchaser for correction of the defect, errors, omission or for replacement in case of rejection.
2.15.0. PURCHASER’S AUXILIARY POWER SUPPLY
2.15.1. The auxiliary power supply for the equipment generally available in the purchaser’s
establishment is as follows

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 a) 220 / 110 Volts ± 10% D.C,
b) 415 Volts ± 10%, 3- phase, 50 Hz ± 3% AC
c) 240 Volts ± 10%, 1- phase, 50 Hz ± 3% AC
If other than the above, the tenderer will be notified in due course.

2.16.0. SPECIAL TOOLS AND TACKLES

2.16.1. The tenderer shall furnish a list of any tools and tackles required for maintenance and operation
purposes with recommended quantities for each sub station.

2.17.0. QUALITY ASSURANCE PLAN

2.17.1. The bidder shall furnish the following information along with his offer failing which the offer may
be liable for rejection.
(1) Statement giving the list of important raw material, names of sub suppliers of raw materials,
list of standards according to which the raw materials are tested, copies of Test certificates.
(2) Information and copies of Test certificate for bought out items.
(3) List of testing equipment available with bidder for final testing of equipment specified.
2.17.2. The supplier shall within 30 days of placement of order submit the following information to the
purchaser.
(1) Name of the raw material supplier as well as that of bought out accessories.
(2) Type test certificates of the raw material and bought out accessories.

2.18.0. ELIGIBILITY CRITERIA FOR COLLABORATORS WITH FOREIGN BASED

MANUFACTURER.
2.18.1. In the event of the tenderer / firm having technical collaboration with a foreign counterpart, he
must submit documentary evidence of such collaboration along with the tender (Technical and
Commercial Bid) as a proof.
2.18.2. Counter guarantee certificate of the product from the foreign counterpart must be submitted
along with the offer.
2.18.3. Credentials regarding manufacture, performance of the equipment offered and test report as
per relevant IS from recognised laboratory of the Govt. of India must be submitted.
2.19.0. DELIVERY
Delivery should be given at destination sub-station at a place assigned by the consignee
(including unloading). The supplier is to arrange all road clearances / permit etc. necessary for
transportation. AEGCL may assist in arranging Road Permit.

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2.20.0. DEVIATION
Any Deviation from the specified condition may be sufficient reason for out right rejection of the
offer.

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 SECTION - 3

SPECIFIC TECHNICAL SPECIFICATION

3.1.0 SCOPE
3.1.1 This section of the specification covers the technical specification for the design, manufacture
and testing of 33 kV SF6 Circuit Breakers complete with all fittings and accessories.
3.1.2 It is not intended to specify completely all the details of the design and construction of the
equipment. However the equipment offered should conform in all respect to high standard of
engineering, design and workmanship and the offered equipment should be complete with all
the components necessary for effective and trouble free operation. Such components shall be
deemed to be within the scope of the tenderer to supply, irrespective of whether these are
specifically brought out in the specification and / or commercial order or not.

3.2.0 STANDARDS
3.2.1 The circuit breakers and associated accessories shall generally conform to the latest issues of
the following standards as given below, except to the extent explicitly modified in this
specification.
(1) IS: 13118 High Voltage Alternating Current Circuit Breakers.
(2) IEC-Pub 56 High Voltage Alternating Current Circuit Breakers.
(3) IS-13072 Sulphur Hexafluoride for Electrical Purpose.
(4) IEC-Pub 376 Specification and Acceptance of New Electrical Purpose.
3.2.2 In case equipment conforms to other international standard which ensure equivalent or better
performance than that specified under Clause 3.2.1, then relevant extracts of the same shall be
forwarded with the bid and the salient features of comparison shall be brought out separately in
additional information schedule.

3.3.0 GENERAL TECHNICAL REQUIREMENTS

3.3.1 The circuit breakers shall be SF6 type.
3.3.2 Breakers shall be 3-phase gang operated. It implies they will be linked together for
simultaneous operation with a common operating mechanism. The breakers should be
supplied as complete units with all accessories and equipment in place and all internal wiring

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 installed and terminated in the control cubicle. The breaker shall be suitable for mounting on
Galvanised steel structure which shall from a part of the breaker supply.
3.3.3 The breakers should be supplied as complete units with all accessories and equipment in place
and all internal wiring installed and terminated in the control cubicle.
3.4.0 BUSHINGS AND INSULATORS
3.4.1 All bushings shall comply with the provisions of IS 2099. The porcelain insulators shall be made
from wet process and shall be homogeneous free from laminations, cavities and other flaws.
3.4.2 The basic insulation level of bushings shall be specified and co-ordinated with that of circuit
breakers. The puncture strength of the bushings shall be greater than the dry flash over value.
All bushings of identical ratings shall be interchangeable.

3.5.0 GAS DENSITY MONITORS

3.5.1 A suitable SF6 gas density monitoring system shall be provided with each SF6 circuit breaker.
3.5.2 In case of loss of gas to a certain level, facilities for ‘alarm’ and ‘lockout’ shall be provided by
means of temperature compensated gas pressure switch.

3.6.0 CONTROL CUBICLE

3.6.1 A free standing outdoor type, weather proof sheet steel cubicle shall be provided, where all the
control equipment and compressed air unit / spring mechanism shall be housed.
3.6.2 The control cubicle shall be constructed out of at least 3.0 mm thick sheet steel and shall have
front, rear and side doors for easy access to the mechanism. Suitable seals shall be provided
to make the cubicle waterproof, dust proof and vermin proof.
3.6.3 Each control cubicle shall be provided with space heaters controlled by thermostat and on/off
switches. Device shall be provided to lock the doors of the cubicles.
3.7.0 CONTROL WIRING
3.7.1 All control, alarm indicators and interlocking devices provided with the breaker shall be wired
up to the terminal block in the control cubicle.
3.7.2 The wiring shall be done with 1000-volt grade, PVC insulated, stranded copper conductor of
size not less than 2.5 sq. mm and not than two wires shall be connected to any one terminal.

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 All wires shall be connected to terminals. All wires shall be identified at both ends with identical
markings at both ends.
3.7.3 The terminal blocks shall be made of moulded non-inflammable plastic materials with bases
and barriers moulded integrally. Each block shall have at least 20% spare terminals.
3.8.0 AUXILIARY SWITCHES AND CONTACTS
3.8.1 The breakers shall be provided with auxiliary switches with 10 normally open and 10 normally
closed auxiliary free contacts. These contacts shall be wired up to terminal blocks. This will be
in addition to those required for the breakers own operational and indicating purposes.
3.9.0 TECHNICAL PARTICULARS
3.9.1 The circuit breakers shall have the following technical particulars.
Technical Particulars
SL 33 kV
No
1 Nominal system voltage, kV 33
2 Highest system voltage, kV 36
3 Rated frequency, Hz 50
4 Number of phases 3
5 Number of poles 3
6 Service Outdoor
7 Rated normal current, A 1250
8 Rated short circuit breaking capacity, kA 25
9 Rated short circuit making current, kA 2.5 times the rated short circuit
breaking current
10 Rated short time withstand current, kA 25
11 Rated peak withstand current, kA
2.5 times the rated short circuit
breaking current
12 Duty cycle 0-0.3Sec-CO-3Min-CO
13 First Pole to clear factor 1.3
14 Operating time
i) Opening time ms Not exceeding 50 ms
ii) Closing time Not exceeding 120 ms
15 Rated insulation level
a) Lightening impulse withstand voltage, kV 170
peak
b) Power frequency withstand voltage, kV rms. 70

16 Minimum clearance between phases, mm 320

17 Minimum clearance between phase to earth , 320
mm
18 Minimum ground clearance (from bottom most 4000
live part to plinth level) . mm

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 Technical Particulars
SL 33 kV
No
19 Minimum clearance from bottom of support 2500
insulator to plinth level) . mm
20 Minimum creepage distance (total) .mm 900
21 Arcing Horn Yes.
22 Operating mechanism
a) Type Motor operated spring
b) rated 3 phase , 50 Hz voltage for drive 415V
motor .
c) Rated voltage for shunt trip coil & operating 220 or 110 ( 50% - 110%)
range , VDC
d) Rated voltage for closing coil & operating 220 or 110 (80% - 110%)
range , VDC
e) No of trip coil 2 per CB
f) No of closing coil 1 per CB
g) No of spare auxiliary contacts & contact 10 N/O +10 N/C ( per CB)
rating. Nos. Amps 10A at 240V AC & 2A at 220VDC
h) Minimum thickness of sheet steel for control 3
cabinet. mm
i) Enclosure Protection IP55
23 Re closing Three phase
24 Steel structure ( painted/galvanised) Galvanised
25 All other parts ( painted/galvanised) Synthetic enamel shade
631 of IS5
(125 microns)
26 Minimum size of control wiring ( copper) 2.5

3.10.0 LOCKOUT DEVICES

3.10.1 Low gas pressure interlocking device: The SF6 breakers shall be provided with low gas
pressure device with low pressure alarm and to prevent closing and opening of circuit breaker
in case of low gas pressure. The device shall have two switches of different pressure settings
for low gas pressure alarm and lockout.
3.11.0 ACCESSORIES
3.11.1 Each circuit breakers shall be supplied with the following fittings and accessories:
a) Clamp type bi-mettalic terminal connectors for ACSR or AAA conductor
b) Two earth terminals per pole for earthing
c) Base frame, anchor bolts, nuts etc.
d) Auxiliary contacts and relays
e) “Local-Remote” electrical switch

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 f) “Close-Normal-Trip” control switch
g) Manual closing / tripping devices
h) Mechanical On-Off indicators in each pole and central cabinet
i) Operation counter.
j) Weather proof control cubicle complete with lock and key
k) Set of switches / fuses / MCB units for A.C. & D.C. supply
l) Space heater with thermostat and cubicle illumination lamp
3.11.2 Other standard accessories not specifically mentioned in this specification but supplied with the
breakers of similar type and rating for efficient and trouble free operation shall also deemed to
be in this specification and will be supplied with each circuit breaker.
3.12.0 TYPE AND ROUTINE TESTS
3.12.1 Type and routine tests shall be done on the breakers supplied as per relevant standard, The
test shall include the following
Routine Test :-
i) Mechanical operation test
ii) Power frequency voltage withstand test (dry)
iii) Tests on auxiliary and control circuits
iv) Measurement of resistance of main circuit
Type Test :-
The bidder shall furnish type test certificates and results of the following tests along with the bid
for breaker of identical design
i) Breaking and making capacity test.
ii) Short time current test
iii) Temperature Rise test.
iv) Lightning Impulse voltage test.

Test Certificates:-
Copies of routine / acceptance test certificates shall be produced with the endorsement of the
inspecting authority to the purchaser before affecting despatch .
The test report shall contain the following information
i) Complete identification data, including Sl No of the breaker.
ii) Method of application, where applied, duration and interpretation of results in
each test.

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 SECTION-4
BIDDING SCHEDULE ON GUARANTEED TECHNICAL PARTICULARS
SCHEDULE-A
(TO BE FILLED IN BY THE BIDDER AGAINST EACH CATEGORY OF CIRCUIT BREAKER)

1.0 GENERAL
1.1. Bidder’s name and address:
1.2. Manufacturer’s name and address:-
1.3. Validity of Tender
1.4. Guaranteed Delivery Schedule

2.0 CIRCUIT BREAKERS

2.1. Type of Construction
2.2. Type of circuit breaker
2.3. Standard applicable
2.4. Principle of operation
2.5. Rated voltage, kV
2.6. Reference ambient temperature
2.7. Continuous current in Ampere
a) Reference ambient temperature 40°C
b) Reference ambient temperature 50°C
2.8. Maximum temperature rise over an ambient of
50°C
2.9. Short time current rating
a) For 1 second
b) For 3 second
2.10. Dynamic peak circuit withstand capacity (kA peak)
2.11. Operating duty
2.12. Opening time in millisecond
2.13. a) Arcing time in ms. At 100%/50%
25%/10% of rated breaking current.
b) Arc length
2.14. Interrupting capacity based on duty cycle at 2.11
a) Symmetrical (kA)
b) Asymmetrical (kA)
c) D.C. component
d) Asymmetrical factor

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2.15. Re-striking voltage characteristics at
a) Symmetrical (kA)
b) Asymmetrical (kA)
c) D.C. component
d) Asymmetrical factor
2.16. Re-striking voltage characteristics at
a) Amplitude factor
b) Rate of rise of re-striking voltage (kV/µs)
c) First pole to clear factor
d) Type of device used, if any to control RRRV
2.17. Number of breaks in series per pole.
2.18. Length of contact travel (mm)
2.19. Total length of break (mm)
2.20. Rate of contact travel
a) Tripping (metre/sec)
b) Closing (metre/sec)
2.21. Rated line charging breaking current (Amps)
2.22. Rated small inductive breaking current (Amps)
2.23. Maximum shunt capacitor bank (single bank)
breaking current (Amps)
2.24. Maximum current breaking capacity under normal
condition when connected to back to back
capacitor bank, Amps
2.25. a) Type and material of main contact
b) Thickness of silver plating (micron)
2.26. Type & material of arcing contact
2.27. Contact pressure (N/finger)
2.28. Insulation level
(I) Power frequency voltage withstand for 1 min
(kV rms)
(II) Lightening impulse (1.2/50 µs) voltage
withstand (kV peak)
2.29. Radio interference voltage test at 28 kV (µV)
2.30. Whether circuit breaker is trip free or fixed trip
2.31. Type & designation of the drive
2.32. Rated control voltage for closing coil (V dc)

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2.33. Pick up voltage of the closing coil
2.34. Power required at
i) Rated voltage (W)
ii) 70% of rated voltage (W)
ii) 85% of rated voltage (W)
iii) 110% of rated voltage (W)
2.35. Type of tripping mechanism
2.36. i) Total interrupting time measured from instant of
trip coil energising to arc extinction (ms.)
ii) Closing time measured from instant of
application of power to closing coil up to arcing
contact touches (ms)
iii) Opening time (switches)
2.37. Maximum over voltage factor of the circuit
breaker when switching off
i) Unloaded transformer
ii) Loaded transformer
2.38. Maximum current breaking capacity when
switching off asynchronous system (out of phase
condition)
2.39. Number of operations, the circuit breaker is
capable of performing without inspection,
replacement of contacts, main parts of SF6 gas /
vacuum bottles
i) At rated current
ii) At 50% rated current
iii) At rated breaking capacity
iv) At 50% rated breaking capacity
2.40. Creepage distance (mm)
2.41. Weight of complete breaker including
poles,operating mechanism and structure
i) Weight of structure (kg)
ii) Weight of operating mechanism (kg)
iii) Weight of SF6 gas per breaker (kg)
(For exact details submit GA drawing)
2.42. Impact loading for foundation design (to include
dead load and impact value)
i) On opening (Newton)
ii) On closing (Newton)
2.43. Insulator
i) Material
ii) Type
iii) Insulation class
iv) 1 min dry power frequency withstands voltage
(kV rms.)

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 v) 10 Sec. Wet power frequency withstand voltage
(kV rms.)
vi) Full wave impulse withstand voltage (kV rms.)
vii) Permissible cantilever loading (kg)
2.44. SF6 gas
i) Name of gas
ii) Supplier of gas
iii) General properties of SF6 gas, Purity (mass in
%)
a) CF4
b) Air
c) Water
d) Hydrolytic fluorides (PPM.)
e) Acidity (PPM.)
iv) Equivalent standard
v) Storage of gas
vi) Thermal characteristics, Specific heat (Joules /
kg °C, kcal / kg °C)
vii) Sublimation temperature (at 760 Torr) °C
viii) Breaking temperature (at 2.29 atm) °C
ix) Physical properties
a) Molecular mass (relative)
b) Vapour pressure at 20°C
c) Critical temperature, °C
2.45. Whether circuit breaker suitable for 1 or 3 phase
reclosing
2.46. Minimum dead time (ms)
2.47. Minimum reclosing time at full rated interrupting
capacity (ms)
2.48. Minimum reclaim time (seconds)
2.49. Limits of adjustment of dead time
2.50. Device provided to give alarm and block tripping
closing of circuit breaker in case of loss of
a) SF6 gas
b) Air pressure of operating mechanism
2.51.
2.52. Rated pressure (bar at 20°C gauge) & limits of
pressure
2.53. Rate of SF6 gas leakage (% per annum)
2.54. Whether the breaker will self-close on low
pressure of SF6 gas

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 2.55. Pole to pole distance
i) Centre to centre
ii) Clearance (mm)
2.56. Maximum pole discrepancy
i) Between poles for tripping (ms)
ii) Between poles for closing (ms)
iii) Between poles for C-O (ms)
iv) Spare auxiliary switches provided (nos.)
2.57. Auxiliary switch contact rating
i) Continuous
ii) Inductive breaking (Amp)
iii) Number of spare contacts
2.58. Clearance between
i) Live part to earth (mm)
ii) Live part to base of structure (mm)
iii) Terminal to base of structure (mm)
2.59. Material of operating rods/ levers
2.60. Permissible humidity for SF6 gas (ppm)
2.61. Refilling period for SF6 gas (years)
2.62. Type and rating of heater
2.63. Details of compressor system
2.64. Details and ratings of motors

Signature _______________________
Date ___________ Designation & Seal _______________

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 Section-5

SPECIAL TERMS AND CONDITIONS

5.1. Sealed tenders in quadruplicate (four copies), each complete with full details as per specification
vide specification no. AEGCL/MD/SS-142 is invited by the Managing Director, Assam Electricity Grid
Corporation Limited, Bijulee Bhawan, Paltanbazar, Guwahati-781001 for the following item from
manufacturer /or authorised dealer/ representative of the manufacturer
(1) When the bidder is not a manufacturer, but an authorised representative/dealer of the
manufacturer, the bidder must submit “Manufacturer’s Authorisation” for the specific supply from the
manufacturer. Format of which is attached with the document as Annexure – III
Moreover, in the event of award of contract to such bidder, the bidder must submit the requisite
performance guarantee as per clause 5.14 of this section in the shape of Bank Guarantee from or in
the name of manufacturer only.
Name of the item: - Design, manufacture, test, supply and delivery of 33kV SF6 circuit breaker for
Dhaliaon substation
5.2. The cost of the tender documents is Rs. 500.00 (rupees five hundred) only in the form of
Bank draft in favour of Managing Director, office of the Managing Director, AEGCL, Guwahati-
781001.
5.3. The tender shall be submitted in two separate parts, each in separate sealed covers super scribed
as follows.
Part I – Technical & Commercial bid.
Part II – Price bid.
5.4. The tenders should reach/be submitted in the office of the Managing Director, AEGCL,
Bijulee Bhavan, Paltanbazar, Guwahati-781001 on or before 14-00 hours on 03.07.09.
5.5. The Part-I (Technical & Commercial bid) of the tender will be opened at 14-30 hours on 03.07.09
in the office of the Managing Director, AEGCL, Bijulee Bhawan, Paltanbazar, Guwahati-781001, in
presence of the authorised representatives who desire to be present.
5.6. The Part-II (Price bid) of the tender of suitable bidders as per Part-I (Technical & Commercial bid)
will be opened separately.
5.7. Tenders shall preferably be submitted in person or by registered post with AD. Tenders received
late due to delay in postal/courier service/ late due to any other reason shall not be considered. The
tenders received after due date and time shall be returned unopened by post.

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(a) Telegraphic tenders / tenders sent by means of FAX shall not be considered
(b) If for any unforeseen reasons the date of opening of bid turns into a holiday, the tenders shall be
opened on the next working day at the specified time
5.8. Tender must be accompanied by earnest money deposit (EMD) in the form of Bank Guarantee
amounting to Rs. 50,000/- (fifty thousand) only. Tenders without EMD / EMD of fewer amounts shall be
rejected outright.
No adjustment towards Earnest Money Deposit shall be allowed against any other outstanding amount
with Assam Electricity Grid Corporation.
5.9. The bidders are to quote ‘Firm’ prices inclusive of all taxes, duties, demurrage charges, bank
interest and freight & insurance charge upto delivery at site. Detail break up of price is to be furnished.
Any other tax, duties, levies what so ever arises but not mentioned are to be borne by the supplier.
Offer for ‘Variable’ price shall be rejected outright.
5.10. The validity of the tender should be 180 days from the date of opening of tender.
5.11. Payment terms: Payment terms are as follows.
(a) 100% payment would be admissible on receipt of materials at site in full and in good condition and
as per terms and conditions stipulated in the purchase order.
The payment as per sub clause (a) will be made only the following conditions.
(i) Proforma invoice in triplicate may be submitted to the consignee for arranging fund.
(iii) Advance copies of bills in triplicate and other information such as challan, packing list etc. shall be
furnished to the consignee.
(iv) Any demurrage charges on account of late information and / or delivery of documents by the bank
are to be borne by the supplier.
(v) No payment shall be made unless Security deposits and performance Bank Guarantee as per
clause no 5 -13 & 5-14 are furnished
(vi) All bank charges are to be borne by the supplier
5.12 Delivery period: The delivery at site shall be completed within 3 (three) months from the date of
technically and commercially purchase order. Delivery is to be done through reputed transporters by
road. Necessary road permit for transportation shall be arranged by the supplier. However, advance
intimation is to be made from your end.
5.13 Security deposit: Security deposit to the extent of 2½% (two & half percent) of the total value of the
order in favour of the consignee shall be submitted within 15 (fifteen) days from the placement of
purchase order. The Security deposit is to be submitted in the shape of Bank Guarantee (B.G.)/
Demand draft valid up to the guarantee period of the equipment.

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5.14. Performance guarantee: A Performance Guarantee for the amount equivalent to 5 % (five
percent) of the total value of the order shall be submitted to the consignee prior to despatch of material.
The ‘Performance Guarantee’ is to be submitted in the shape of Bank Guarantee (B.G.) valid up to 90
days after the end of the ‘guarantee period’ of the equipment.
5.15. Name and address of the consignee: to be intimated at the time of order
5.16. Guarantee: The materials/ equipment shall be guaranteed for satisfactory performance for a
period of 12 months from the date of commissioning or 18 months from the date of receipt of materials/
equipment in AEGCL’s stores in full and good and acceptable conditions, whichever is earlier.
During the period of guarantee you shall rectify all defects in design, materials and
workmanship that may develop under the normal use of the equipment upon written notice from the
consignee. This rectification/ free replacement must be carried out within a reasonable period and you
will do the rectification free of cost.
5.17 Liquidated damage: In case of failure to complete the supply of the materials/ equipment within
stipulated delivery period or extended delivery period as the case may be, you shall liable to pay as
liquidated damage a sum equivalent to ½%(half percent) of total value of the undelivered materials or
materials delivered late per fortnight delay subject to maximum of 10%(ten percent) of the total value of
the such delayed portion of the materials /equipment or the total value of the liquidated damage to
AEGCL. In case such a liquidated damage is found to be higher than the 10% value of the undelivered
material, the 10% of the contract price shall be recovered. This is however subjected to force majure
clause 5.18
5.18 Force majure: Normally Force majure shall cover only act of God, fire, wars, strike, riots and civil
commotion, act of Government etc. Any constraints other than those specified above will not constitute
force majure condition. In view of the other constraints beyond the control of the supplier primarily due
to statutory compulsion, extension of delivery period may also be considered on individual merit of
case. In case of force majure condition you shall notify the undersigned such conditions within 10(ten)
days from the beginning of such delay in writing for consideration and acceptance

5.19. Telephone no/ Fax no/ address of the Managing Director, AEGCL is
“The Managing Director, AEGCL, Bijulee Bhawan, Paltanbazar, Guwahati- 781 001
Telephone no/ Fax no: 0361- 2739513
5.20 All other details are available in the tender specification.
5.21. The Managing Director, AEGCL is not bound to accept the lowest quoted tender and reserves the
right to reject any or all tenders without assigning any reason thereof.

Sd/-
Managing Director
AEGCL

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 ANNEXURE - 1
ABSTRACT OF TERMS & CONDITIONS

Following information is to be furnished in the ‘Technical and Commercial bid’

(PART – I) as first page.
(Please tick mark where necessary.)
1) Earnest money (EMD) :Submitted/Not submitted
a) Amount of EMD :Rs.
b) Submitted in the form of
i) Bank Guarantee : Yes/No.
2) Validity of the offer : ……. days from the date of opening of
‘Technical & Commercial Bid’ & ‘Price
bid’.
3) Nature of price offered
i) ‘FIRM’ Price : Yes/No
4) Terms of payment : Yes/No
(Whether agreeable to accept payment as specified in
clause- 5.11 of ‘Special terms & conditions’ of
Specification)
5) Date of completion of supply. : Yes/No
(Please specify the date of completion of supply as per
specification)
6) Guarantee : Yes/No
(Whether agreeable to accept as specified in Clause
no- 5.16 of the Specification)
7) Delay in delivery or commissioning : Yes/No
(Whether agreeable to accept as specified in Clause
no- 5.17 of the Specification)

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 8) ‘Security and performance guarantee’ : Yes/No
(Whether agreeable to accept as specified in Clause
no- 5.13 & 5.14 of ‘Special terms & conditions’ of
Specification)
9) Sales tax clearance certificate of the current year : Yes/No
furnished
10) Whether the material bear ISI mark : Yes/No
11) Whether the material bear ISO certificate : Yes/No
12) Whether guaranteed technical particulars as per the : Yes/No
specifications are furnished
13) Whether drawing etc. as per specification are furnished : Yes/No
14) List of orders executed for similar works furnished : Yes/No
15) Performance certificate from the various SEB and : Yes/No
other organisations furnished
16) Deviation from the specification
a) Technical : Yes/No
b) Commercial : Yes/No
17) Information in respect of technical capability is : Yes/No
furnished
18) Information in respect of Financial capability certificate : Yes/No
from the Banker is furnished

It is certified that the rates have been quoted as per terms and conditions laid down in the tender
specification and without any deviation.

Date: Signature of tenderer with seal

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 Annexure-II

BANK GURANTEE FORM

(Bid Security/ Performance Guarantee)

Bank guarantee no…………………….. dated………………

The Bank of …………………. here by agrees unequivocally and unconditionally to pay, within
48(forty eight) hours, on demand in writing for the ASSAM ELECTRICITY GRID CORPORATION
LIMITED (AEGCL) OR ANY OFFICER AUTHORISED by it in this behalf, of any amount up to and not
exceeding Rs………………..(Rupees…………………………………………………….) only to the
said…………………………………………………who have participated in the tender for
‘…………………….’ against specification no. AEGCL/MD/SS-……. Invited by the Managing Director,
AEGCL.
This agreement shall be valid and binding on this Bank up to and including
Rs………………..(Rupees………………………………………..) and shall not terminable by notice or any
change in the constitution of the Bank or the firm or contractors or by any persons whatsoever & liability
here under shall not be impaired for discharged by any extension of time or variations or alternations
made given, concerned to agree with or without our knowledge or consent, by or between the parties to
the said written contract.
Our liability under the Guarantee is restricted to Rs………………..(Rupees
……………………………..…………………..) only. Our Guarantee shall remain in force and valid
till………….…unless a suit or action to enforce a claim under the Guarantee is filed against us within
6(six) months from the aforesaid date & all your rights under the said Guarantee shall be forfeited and
we shall be relieved and discharged from all liability thereon.

Signed……………………………
For……………………………….
Bank……………………………...

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 Annexure-III
Manufacturer’s Authorisation

Date…………………………..
NIT No:-………………………………

To _______________________________________________________________________________

WHEREAS ___________________________________________________________who are official

manufacturer of ______________________________________________________________having
factories at ________________________________________________________________________
do hereby authorize _______________________________________________________________ to
submit a Bid in relation to the invitation for Bids indicated above , the purpose of which is to provide the
following goods , manufactured by us ________________________________________________ and
to subsequently negotiate and sign in the Contract

We hereby extend our full guarantee and warranty in accordance with the terms and conditions of
contract with respect to the goods to be supplied by the above firm in reply to this invitation of tender.

Name __________________________________________________________________________
In capacity of _____________________________________________________________________
Signed :-__________________________________________________________________________
Duly authirised to sign the authirisation for and on behalf of ___________________________________

Date ______________________________________________________________________________

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 SECTION-6
PRICE BID SCHEDULE
(To be submitted in the Part-II, ‘Price bid’ in a separate sealed envelope in quadruplicate)
Item Uni Qty Rate per unit (Rs.) Amount
t Ex E.D. E. CST F&I Any other FORD (Rs.)
works Cess charges
1 36 KV, out door SF6 Circuit breaker, No 4
with terminal connector suitable for
ACSR Wolf Conductor
2 Spares
a) Gas filling device No 2

b) Trip Coil No 8

c) Closing coil No. 4

NB. Quantities are tentative which may be changed at the time of placing order and quoted rates shall be applicable for different Substation under AEGCL.

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