TECHNICAL SPECIFICATION FOR - Gujarat Electricity Board

GETCO/E/TS-IPS016/RO DT.11-12-07
TECHNICAL SPECIFICATION
FOR
ALUMINIUM TUBULAR BUS BAR
GUJARAT ENERGY TRANSMISSION CORPORATION
LTD
SARDAR PATEL VIDYUT BHAVAN, RACE COURSE
BARODA:390 007
GETCO/E/TS-IPS016/RODT11-12-07
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GETCO/E/TS-IPS016/RO DT.11-12-07
TECHNICAL SPECIFICATION FOR ALUMINIUM TUBULAR BUS BAR
1.0 SCOPE:
The specification covers the design, manufacture, assembly, inspection,
testing and delivery of Aluminium Tubular bus bar which are required for
outdoor bus of 400 KV Sub – stations in the Gujarat State.
2.0 REQUIREMENTS:
The quantities of tubular bus bar are shown in Schedule – A of this
specification
3.0 STANDARDS:
3.1 Design, manufacture, performance of the tubular bus bar, shall comply with all
currently applicable standards regulations and safety codes in the locality
where the same is to be installed. Unless otherwise, specified, bus bar should
conform to the latest applicable Indian standards and in particular to the
following:
IS : 5082
: Specification for wrought – Alumiumin & Aluminium alloy,
bars, rods, tubes and sactions for electrical purpose.
Acceptance tests/chemical composition.
IS : 731-1971
IS – 2121-1982
: Method of high voltage testing/Corona/RIV
: Specification for conductors and earthwire accessories
for overhead power lines.
3.2 Materials conforming to any other national standards which ensure equal or
better services shall be acceptable.
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GETCO/E/TS-IPS016/RO DT.11-12-07
3.3 If required, modifications shall have to be incorporated, as directed by the
Board for items ordered with you without any extra cost.
4.0 ALUMUNIUM TUBULAR BUS BAR (BALCO/NALCO/HINDALCO/BANCO
MAKE)
4.1 Material of Aluminium Tubular shall be cold drawn aluminium tube with
minimum 57% IACS conductivity at 20 o C temperature. (International
Annealed Copper standards)
4.2 The tube sizes shall be in accordance with the standards.
4.3 Yield strength shall be based on tensile stress of 1335 kg/cm 2 and the
breaking strength shall be based on the tensile stress of 1545 kg/cm 2
4.4 The tubular bus shall have adequate strength to withstand mechanical forces
due to short circuit current of 40 KA for 3 seconds respectively for 4” & 2” IPS
pipe.
4.5 The temperature of tubular bas bar when carrying full load current shall not
exceed 45 o C above the site ambient temperature.
4.6 The aluminium tubular bus bar offered shall not have any sharp edges, cuts,
abrasions, etc and shall be free from visible corona.
4.7 The radio interference voltage level of the tubular bus bar shall be below 500
micro volts, at a voltage 20% above the highest line to earth value of the
megahertz.
4.8 Preference shall be given to the firms having ISO.
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GETCO/E/TS-IPS016/RO DT.11-12-07
5.0 SPECIFIC TECHNICAL REQUIREMENT
5.1 a) Standard pipe size : 114.3mm (4”) 60.33mm (2”)
b) Material : Aluminium of grade 91E
Confirming to IS:5082 of 1969
c) Atmosphere : Corrosive and fungicidal
d) Type of corrosive atmosphere : Saline & industrial pollution
e) Rated voltage : 420 KV KV
f) Impulse withstand voltage : 1425 KV
g) Switching surge withstand : 1050 KV
5.2 The maximum length of tube that can be supplied with and without stationing
limitations on transport stipulation shall be indicated in the Bid. Standard
length of 7 meters for 4” IPS and 7.5 meters 7.5 Meters for 2” IPS will be
preferred.
6.0 TEST
6.1 Individual tubular bus bar shall be subjected to following tests:
a) Temperature rise test for rated current
b) Three second short circuit test
c) Critical disruptive voltage test for 4” IPS pipe
d) Yield strength
e) Chemical composition.
The bidder shall have to submit copies of Type test certificate of any
Government recognized Laboratory for consideration along with the technical
bid. The date of type test conducted should not be later than 5 years as on the
date of opening of technical bid.
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GETCO/E/TS-IPS016/RO DT.11-12-07
7.0 INSPECTION & TESTING:
a) The Board reserves the rights to inspect the materials at any stage of
manufacturing. All acceptance tests as per relevant specification shall
be performed in the presence of the Board’s inspecting authority. The
Bidder will have to give intimation of place, Date and Time of such
testing to the Board sufficiently in advance to enable the Board to
depute its representative to be present at the testing. No material shall
be dispatched without having been passed by Board’s representative.
Routine/Acceptance tests shall have to be arranged by the Bidder, in
accordance with the relevant standards free of cost for each lot of
supply.
b) Inspection by the Board’s representative shall not relieve the Bidder
from his obligation of furnishing material in accordance with the
relevant specification.
8.0 PERFORMANCE:
The Bidder has to clearly state their experience, resources, engineering
organization to undertake this work of supply. The Bidder shall have minimum
experience of 3 years in the manufacture of similar items. However, the Board
reserves the right to waive stipulation in respect of experience for new firms.
9.0 DRAWINGS :
Immediately, on receipt of the order, the Bidder should come with the
necessary drawings for approval of the user department.
10.0 a) The technical Bid should be comprising of all the information as per the
format given with this specification.
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GETCO/E/TS-IPS016/RO DT.11-12-07
b) True copies of all Type test certificates of Govt.recognised Laboratory
in respect of offered items only shall be furnished.
c) Descriptive literature, dimensional drawings, catalogues, etc. shall be
Submitted for the offered items.
Bids which doe not give complete details, or which are vague and
technically not in line with the Board’s requirements shall be liable for
rejection. Telegraphic or short bids will also be not considered.
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GETCO/E/TS-IPS016/RO DT.11-12-07
SCHEDULE - `B’
(TO BE FILLED IN COMPLETELY AND SHALL BE SUBMITTED WITH
TECHNICAL BID)
TECHNICAL REQUIREMENTS AND GUARANTEED TECHNICAL
PARTICULRS:----
SR.NO.
REQUIREMENTS
1. Manufacturer’s Name
and Country
2. Standards to which
confirming
3. 91E WP of IS 5082-
1969 57% IACS at 20
ºC
4. Size of tubular bus 114.3mm (4” size) 60.33mm(2” size)
conductor
4A Wall thickness 6.35mm 5.54mm
4B Tolerance on wall -0.0
-0.0
Thickness
+shall be +shall be
acceptable acceptable
5. Outside diameter 114.3mm 60.33mm
6. Tolerance on outer ± 0.38mm ±0.1mm
diameter
7. Inside diameter 101.6mm 49.25mm
8. Tolerance on side +0.38 +1
diameter
9. Area 2152mm² 954mm²
10. Conductivity to IACS 57% 57%
11. Resistivity at 20ºC Micro ohm-cm 3.133
12. Weight Kgs/Mtr. Kgs/mtr.
13. Current rating at site
condition
2300 Amp. 1680 Amp.
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GETCO/E/TS-IPS016/RO DT.11-12-07
14. Tubular bus conductor Should not exceed Should not exceed
temperature when 45ºC above 45ºC above
carrying rated current ambient
ambient
at site condition.
15. Short circuit current 40KA
40KA
rating for 3 seconds
duration
16. Yield strength at tensile
stress or 1335 Kg/.cm²
To be furnished by
the Bidder
To be furnished by
the Bidder
17. Minimum breaking To be furnished by To be furnished by
strength at tensile the Bidder the Bidder
stress of 1545 Kg/.cm²
18. Deflection of tubular
bus conductor for 10
To be furnished by
the Bidder
To be furnished by
the Bidder
Mtr. Span.
19. Standard piece length 7 mtrs. 7.5 mtrs.
of tubular bus
conductor
20. List of Type test carried
out at Govt. recognized
Laboratory (certificate
to be enclosed.
a) Tensile Test Kg/.cm² 20.5(minimum)
b) Resistivity Test µ /cm 3.133(Micro ohmcm)
c) Temperature rise test
d) Three second short 40KA
40kA
circuit test
e) Critical disruptive Above / Equal to
voltage test (Corona 320 KV
test for 4” IPS pipe)
f) Yield Strength To be furnished by
Bidder
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GETCO/E/TS-IPS016/RO DT.11-12-07
g) Chemical
Copper-0.05%, Sicomposition(max.
0, 3-0.7%, Alvalues)
Balance
21. For testing, please To be furnished by
indicate the name and Bidder
Address of laboratory.
22. Dimensional drawings To be furnished by
Bidder
23. Type tests to be
submitted along with
the offer
a. Short circuit test 40KA
for 3 seconds.
b. Temp.rise test
c. Critical disruptive
voltage test (for 400KV
only)
d. Yield strength
e. Chemical composition
24. Experience certificate
25. Finance report
indicating loss and
profit A./C for last three
years.
Mg-0, 4.0.9% Fe-
0.5%
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GETCO/E/TS-IPS016/RO DT.11-12-07
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