Extension Notice

ASSAM POWER DISTRIBUTION COMPANY LTD.
BID DOCUMENT
FOR
DEVELOPMENT OF INFRASTRUCTURE FOR POWER SUPPLY
TO GREATER TITABOR WATER SUPPLY SCHEME INCLUDING
RAILWAY TRACK CROSSINGS BY U/G CABLE UNDER
GOLAGHAT ELECTRICAL DIVISION
ON
“TURNKEY” MODE
UNDER GOLAGHAT ELECTRICAL CIRCLE, APDCL (UAR)
ON
“TURNKEY” MODE
SCHEME: “Annual Plan for 2014-15”
Package No. GEC/2014-15/01
NIT No.CGM (D)/ APDCL/UAR/TITABOR WSS/2014/01
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SECTION -1
NOTICE INVITING TENDER
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ASSAM POWER DISTRIBUTION CO. LTD
UPPER ASSAM REGION
NOTICE INVITING RE- TENDER
Tender Notice No CGM(D)/APDCL/UAR/TITABOR WSS/2014/01
Sealed Tenders are invited from experienced & financially sound Electrical
Contractor(s) (individual or joint venture)/Firm(s) having valid electrical contractor license up to
33kV issued by the competent authority of the Govt. of Assam for construction of 11KV line with
A.B. Cable for Greater Titabor WSS under Golaghat Electrical Division, APDCL, UAR including
laying of cables through existing Railway track crossing by U/G cable under Annual Plan, 201415.on “Turnkey” mode.
Cost of Tender Paper:- Rs 6000.00 (Rupees Six thousand) only in the form of A/C
payee Demand Draft/Bankers cheque (non refundable) duly pledged in favour of “ ASSAM
POWER DISTRIBUTION COMPANY LIMITED”. Tender papers can be purchased in all working
days up to 4.00 Pm w.e.f. 10-03-2015 to 19-03-2015 from the office of the Chief General
Manager (D), UAR, APDCL, Bijulee Bhawan,Paltanbazar, 6 th floor Guwahati-1.
The bidders who had already submitted their bids may be allowed to withdraw for
resubmission or retain the bids already submitted against the above NIT.
Details may be seen in the website www.apdcl.gov.in
Chief General Manager (D),
APDCL, UAR, 6th floor, Bijulee Bhawan.
Guwahati-1
Memo No. CGM (D)/APDCL/UAR/TITABOR WSS/2014/01/
Dt.
Copy to: 1.
2.
3.
4.
5.
6.
7. .
PS to the Chairman, APDCL/AEGCL/APGCL, Bijulee Bhawan for kind appraisal of the Hon‟ble Chairman.
The Managing Director), APDCL, Bijulee Bhawan.Paltanbazar, Ghy-1
th
The CGM (PP&D), APDCL, 6 floor, Bijiulee Bhawan, Paltanbazaar, Guwahati-1 for favour of information.
The GM, Jorhat Zone, APDCL, Jorhat, for information.
The DGM, Golaghat Electrical Circle, APDCL (UAR), Golaghat, for information & necessary action.
The PRO, ASEB.Bijulee Bhawan.Paltanbazar, Ghy-1. for publication of the above tender in one issue of
“The Assam Tribune” and “Dainik Janambhumi”.
The OSD to Chairman, Bijiulee Bhawan, Paltanbazaar, Guwahati for publication in the official website.
Chief General Manager (D),
APDCL, UAR, 6th floor, Bijulee Bhawan.
Guwahati-1
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ASSAM POWER DISTRIBUTIOM CO. LTD,
Upper Assam Region
EXTENSION NOTICE
Ref:- NIT No.CGM (D)/APDCL/UAR/TITABOR WSS/2014/01/
This is for general information of all the intending bidders that the last date of
submission of bids for the above mentioned NIT for construction of 11 KV line by A B cable for
Titabar WSS under Golaghat Electrical Division, APDCL is hereby extended as follows with the
amendments of item serial no 3.(Vii). (g) Of Bid documents as mentioned hereunder.
The bidders must have adequate experience for completion of 5.0 KM LT line by AB
Cable.
1. Sale of Tender Paper: - from 10-03-2015 to 19-03-2015
2. Submission of Bid
: - up to 13:00 hrs on 24-03-2015
3. Opening of the Techno- Commercial bid: - At 14:00 hrs on 24-03-2015
. The bidders who had already submitted their bids will be allowed to withdraw for
resubmission or retain the bids already submitted against the above NIT.
Details may be seen in the website www.apdcl.gov.in
Chief General Manager (D),
UAR, APDCL, 6th floor, Bijulee Bhawan,
Paltanbazar, Guwahati-781001
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ASSAM POWER DISTRIBUTION CO. LTD
UPPER ASSAM REGION
NOTICE INVITING RE- TENDER
Tender Notice No CGM(D)/APDCL/UAR/TITABOR WSS/2014/01
Sealed Tenders are invited from experienced & financially sound Electrical Contractor(s) (individual or
joint venture)/Firm(s) having valid electrical contractor license up to 33kV issued by the competent authority of the
Govt. of Assam for construction of 11KV line with A.B. Cable for Greater Titabor WSS under Golaghat Electrical
Division, APDCL, UAR including laying of cables through existing Railway track crossing by U/G cable under
Annual Plan, 2014-15.on “Turnkey” mode.
Tender papers can be purchased in all working days up to 4.00 Pm w.e.f. 10-03-2015 to 19-03-2015
th
from the office of the Chief General Manager (D), APDCL, UAR, Bijulee Bhawan, Paltan bazaar, 6 Floor,
Guwahati-1.
Source of fund:
Annual Plan, 2014-15
Eligibility Criteria:
1) Average annual turnover of the bidder for last three consecutive financial years for the works should be
as mentioned below and duly certified by registered Chartered Accountant.
2) Past and present performance of the bidder in ASEB in any of its successor companies will be taken
into account to decide the eligibility as per clause 4(b) of sec-2.
3) The bidders must have adequate experience in doing similar electrical construction and commissioning
work and to be substantiated through certificate issued by an engineer not below the rank of
DGM/CEO along with supporting copies of the work executed under any reputed utility/department.
Lack of experience of the bidders will render the bid liable for rejection. The certificate should form a
part of the Techno-commercial bid. (as per clause no 4 of sec-2.
4) The bidder must not be involved in any litigation with ASEB/ or any successor company of ASEB. The
bidder should submit a declaration to that effect.
5) Earnest money should be as mentioned below. However Earnest money deposit (EMD) will be 50%
for SC, ST, and OBC bidder subject to submission of caste certificate along with the TechnoCommercial bid of the tender.
Average annual
Completi
Earnest
Turnover
Package
Description of work
on
Money
(Rs
in
requirement ( Rs
period
Lacs)
in Lacs)
Construction of dedicated 11KV line with A B Cable
including laying of cables through existing Railway
GEC/20142 (two)
3.75
350
track crossing by U/G cable for power supply to Titabor
15/01
months
water supply scheme under Golaghat Electrical
Division APDCL UAR under annual plan,2014-15
Bid Validity: - 180 days from the date of submission of Bid
Cost of Tender Paper for the Package: Rs.6000.00, only against the package, in the form of „A/C Payee Demand
Draft/Banker‟s Cheque (non-refundable) duly pledged in favour of “ASSAM POWER DISTRIBUTION COMPANY
LIMITED”. Tender paper can be purchased on all working days up to 4.00 Pm w.e.f. 10-03-2015 to 19-03-2015
from the office of the Chief General Manager (D), APDCL (UAR), Bijulee Bhawan, 6 th Floor Guwahati-1.
Alternatively, the Bid document can be downloaded from the APDCL‟s website: www.apdcl.gov.in for tender
submission purpose. The Bid can be down loaded up to 4 pm of 10-03-2015 to 19-03-2015.The bidder using down
loaded document will attach with their Bid an A/C payee demand draft/Banker‟s cheque (non- refundable) of Rs.
6000.00 (Rupees Six thousand) only duly pledged in favour of ASSAM POWER DISTRIBUTION COMPANY
LIMITED.Guwahati-1” as cost of the tender paper. Bidder will ensure that the payment instrument submitted
against the Bid must be procured on or before the closing date of sale for Bid documents & also ensure
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that the documents in full is downloaded and used. Any Bid without the payment of cost of tender paper as
above will be rejected outright.
Date of submission of Tenders: Up to 13-00 Hrs. of 24-03-2015
Date of opening of Bid: Techno commercial bids will be opened at 14-00 Hrs. of 24-03-2015 and the price bid on a date
to be notified later on.
Terms & Conditions:1. The work should be carried out as per latest REC specification and construction standard.
2. In case of a joint venture firm, the relevant deed in support of joint venture, an agreement duly
registered or certified by notary must be submitted along with the bid. In absence of such
documents, the tendered form a joint venture firm shall be rejected.(for joint venture requirement
refer SL 5 of sec-2)
3. The Techno Commercial and Price bid must be submitted in two separate sealed cover
envelope super scribing (a) Tender No. (b) Name of the bidder with full address (c) “TechnoCommercial bid with earnest money” for envelope containing Techno-Commercial bid and “price
bid” for envelope containing the price bid.(d) NIT reference number.
4. Rates should be quoted both in figures and words legible and no overwriting will be accepted.
5. Earnest money as stipulated should be submitted with the Techno Commercial bid in the form
of Bank Guarantee (BG) of nationalized Bank/NSC/KVP/Term Deposit/FD only, pledged in
favour of “ASSAM POWER DISTRIBUTION CO. LTD, Guwahati-1”. Valid up to Oct, 2015. Any
tender without earnest money will be rejected outright.
6. Quoted rate should be inclusive of all taxes and duties and firm. Taxes should be shown
separately
7. Quote rate must valid for minimum 180 days.
8. The tender should be addressed and submitted in the office of the Chief General Manager (D),
APDCL (UAR), Bijulee Bhawan, 6 th floor, Paltanbazar, Guwahati-1 and will be opened on the
scheduled date & time in presence of the intending renderers and/or their representative.
9. The Company reserves the right to accept or reject any tender in part or in full or spilt the work or
cancel/withdraw the notice inviting tender without assigning any reason thereof whatsoever and
in such case, no tendered/intending renderer shall have any claim arising out of such action.
10. In case of SC/ST/OBC bidders the amount will be 50%. However, in case of J.V., the lead partner
bidder along with all other bid partners should be also SC/ST/OBC in order to avail 50 % EMD.
Chief General Manager (D),
APDCL, UAR, 6th floor, Bijulee Bhawan.
Guwahati-1
Memo No. CGM(D)/APDCL/UAR/TITABOR WSS/2014/01/
Copy to: -
Dated:-
1. PS to the Chairman, APDCL, AEGCL, APGCLBijulee Bhawan for kind appraisal of the Hon’ble Chairman.
2. the GM, Jorhat Zone, APDCL, Jorhat, for information.
4. The DGM, Golaghat Electrical Circle, APDCL (UAR), Golaghat, for information & necessary action.
5. The PRO, ASEB.Bijulee Bhawan.Paltanbazar, Ghy. for publication of the above tender in one issue of “The
Assam Tribune” and “Dainik Janambhumi”.
6. The OSD to MD, APDCL, Bijiulee Bhawan, Paltanbazaar, Guwahati for publication in the official website.
Chief General Manager (D),
APDCL, UAR, 6th floor, Bijulee Bhawan.
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SECTION 2
TENDER INVITING PROPOSAL
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ASSAM POWER DISTRIBUTION COMPANY LTD
OFFICE OF THE CHIEF GENERAL MANAGER (D), APDCL, (UAR) GUWAHATI-1
TENDER INVITING PROPOSALS WITH TERMS & CONDITIONS
1. Intent of the Tender Enquiry
The intent of the Tender Enquiry is to invite proposals from the prospective and relevantly experienced and
financially sound contractor(s) (individual or joint venture)/firms to carry out the works of Construction of 11KV
line with A.B. Cable for Greater Titabor WSS under Golaghat Electrical Division, APDCL, UAR including
lying of cables through existing Railway track crossing by U/G cable under Annual Plan, 2014-15.on
“Turnkey” mode.
2. Scope of Work
The various activities under the scope of work shall among other related aspects cover the following.
i. Procurement and supply of all materials required for the work.
ii. Site unloading, storage and handling of all materials supplied including watch and ward for safe custody.
iii. Site fabrication work as per requirement.
iv. Submission of implementation schedule from the date of award of contract for:  Route survey for laying new line.
 Erection, testing and commissioning of all materials/equipment supplied/system installed.
 changing of conductor of a section of existing line
v. Project management and site organization.
vi. Obtaining clearance from statutory Agencies, Govt. Departments, and Village Panchayats etc.
vii. Submission of specification/Test Certificate/Drawings etc. of all materials supplied.
viii. A list of various items normally involved in proposed type of work is provided in this document. This,
however, is not to be considered as limiting but only typical. Vendor’s scope will include all other items and
materials as may be required to effectively complete the work.
ix. Required Jungle cutting.
Above all, the scope of work of the vendor/contractor will include all items and facilities as may be necessary to
complete the electrification work on turnkey basis and as binding requirement. Proposed location for the works is
to be allotted to the successful bidder by the field officer.
3. Basic specification of the various equipment/ works to be supplied and carried out.
i. All equipment supplied shall conform to the requirement of relevant ISS (BIS) as approved by Company and that
of REC specification and construction standards.
ii. For ready reference, the basic specification of major items, namely- A B Cable, Conductor, insulated tapping
arrangement kit for HT cable, straight through joint,Termination kit, anchor clamp, suspension clamp, eye hook,
eye bolt, earth spike pad connector, HT Stay set, Guy insulator, Stay wire, CI earth pipe, GI wire 8/6 SWG, Nuts &
bolts, P S C pole, isolator, LA etc. are to be provided in the Technical Specification Section. Based on this, the
vendor shall draw total specification for procurement after approval of Company.
iii. All materials supplied shall be erected, protected as per approved standard practice for proposed type of
electrical work so as to supply electricity to the consumer most effectively and in an intrinsically safe manner.
iv. All equipment supplied and installed shall provide easy and effective:
 Maintainability
 Reliability
 Availability
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 Long life
All equipment supplied and installed shall be provided stable and adequate weather protection, system earthing etc.
v. All items, which may require frequent opening up/ dismantling for maintenance, shall be adequately sealed
against any tampering/ theft etc.
vi. All supporting structures shall be of steel as per IS 2602 appropriate grade.
vii. Generally supply and erection of materials and system shall meet the requirement of construction standard
being followed in the electrification works.
vii. Basic qualifying requirement:
The prospective bidder must fulfill the following pre-bid qualifying requirement
a. The bidder must have valid electrical Contractor License and Supervisor License (HT) up to at least 33KV issued
by the Licensing Authority of Govt. of Assam. .
b. The bidder must have adequate experience of doing H T/LT Line construction job on turnkey basis of similar
works (at least 5 Km).
c. Average annual turnover of the bidder for last three consecutive financial years should be at least as per the
requirement shown in the table against particular package or packages and the annual turnover should be certified
by a registered Chartered Accountant with balance sheet.
e. The bidder shall furnish latest Income Tax clearance certificate and sales tax registration and valid Labour
License, Employees’ P.F registration and WCT registration Certificate, VAT & Service Tax certificate.
f. The bidder shall furnish details of the work / works along with its value already in hand either of APDCL, or in
any other successor companies of ASEB along with date of completion as per Letter of Award and actual date of
completion duly certified by the competent authority as per format enclosed as Annexure-IA. This requirement
shall be treated as one of the major qualifying criteria for technical evaluation of the bid.
g. The bidder must have adequate experience for completion of 5.0 KM L.T. A.B. Cable which will
be one of the major criteria for qualification. Alternatively, the bidder may also tie up with
experience vendor and necessary credential for completion of similar job must be submitted in this
respect.
4. Joint
Venture Requirement
i. The bid and, in case of successful Bid, the form of agreement shall be signed so as to be legally binding
both the partners.
ii. One of the partners shall be authorized to be as the lead partner and this authorization shall be evidence by
submitting a Power of Attorney signed by legally authorized signatories of the partners.
iii. The lead partner shall be authorized to incur liabilities, receive payments and received instruction for and on
behalf of any or all partners of the joint venture and the entire execution of the contract.
iv. All the partners of the joint venture shall be jointly and severally liable for the execution of the contract in
accordance with the contract terms and a relevant statement to this effect shall be included in the authorization
mentioned under (ii) above as well as in the Bid form and the form of agreement ( in case of successful bidder).
v. A copy of the agreement entered into by the joint venture partners shall be submitted with the bid.
vi. The figure of average annual turnovers for the joint venture partners shall be added together to determine the
bidder’s compliance with the minimum average turnover requirement of the package. However, the lead partner
must be meeting at least 40% and other partner must be meeting at least 25% of the minimum average annual
turnover criteria given in the tender.
5. Other requirements:
The Tendered
i) Should be acquainted himself or his associate with relevant conditions of the local geography and socioeconomic setup of the different location of the State and being capable accordingly to mobilize, organize and
expedite the activities.
ii) Should have adequate working personnel comprising of Electrical/ Mechanical engineers, electrical
supervisor, skilled and unskilled labours to be deputed to the proposed assignment.
iii) Should be conversant with the code/ standards applicable to proposed type of work. ISS, REC guidelines.
6. Submission of bid:
The bid shall be submitted in a sealed envelope as follows:
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a. Techno-commercial bid
The Techno Commercial Bid should be submitted in a sealed envelope; Super scribing “ Techno-Commercial bid
with EMD” with name of bidder ,full address and NIT reference and under this will be included and defined
vendors scope of work, responsibilities, guarantees, specification of equipment(GTP), commercial terms and
conditions, vendor’s company credentials, experience of similar assignments, registration details, etc. as per
requirement. Tender format for techno-commercial Bid is enclosed as Annexure-I.
released on finalization of the tenders. The EMD to the successful bidder will be released on submission of Security
Deposit at the time of execution of the agreement as per clause 11.3
b. Submission of documents with Technical bids:.
a) With bids.i) Detail list of makes and materials offered with catalogues, technical specification with necessary GTPs &
drawing of materials, etc.
ii) Certificates and testimonials in support of credentials of the bidder’s organization. Turnover of the vendor has to
be certified by Chartered Account.
iii) Details past experience to be substantiated through certificate issued by an engineer not below the rank of
DGM/CEO along with supporting copies of the work executed under any reputed utility/department..
iv) Brief write-up on methodology to carry out the assignment, if awarded.
v) Details of manpower to be engaged for the assignments, Employees’P.F. registration.
vi) Any other information, the vendor may feel facilitative in evaluating the bid.
vii) Copies of contractor and supervisor’s license, Income Tax clearance certificate, turnover, etc.
viii) Photo copy of the PAN card.
ix.) Solvency certificate from Bank.
x). Certificate in support of performance of the bidder.
xi) Latest VAT registration and clearance certificate, WCT, CST registration certificate, Service Tax registration,
Employee Provident Fund and valid labour license.
c Earnest Money Deposit (EMD):
The Tender must be accompanied with earnest money as mentioned in the NIT against each package to be
deposited in the form of Bank Guarantee (BG) of nationalized Bank/ NSC/KVP/Term Deposit/FD/Bank Call
Deposit, pledged in favour of “ASSAM POWER DISTRIBUTION CO. LTD. Guwahti-1”. The earnest money
should be submitted along with Techno-Commercial Bid. The earnest money to the unsuccessful bidders will be
returned after finalization of the bid/issue of work order to successful bidder.
d. Price Bid
The Price Bid should be submitted in a separate sealed envelope super scribing “price bid” with name of bidder,
NIT reference No. Under this will include rates of supply and erection of different items for electrification
according to the BOQ. The tender proforma for price Bid is enclosed as Annexure-II.
e. Submission of bid
Both the envelope should be placed in a bigger envelope duly sealed super scribing name of bidder, NIT
reference and address to the CGM (D), APDCL, UAR Bijulee Bhawan, Paltanbazar, Guwahati-1
Note:-:
a. If there is discrepancy between the unit price and the total price that is obtained by multiplying the unit price and
quantity, the unit price shall prevail and total price should be corrected. If there is a discrepancy between the words
and figures, the amount in word should prevail. If the bidder does not accept the correction of the errors as above,
his bid will be rejected and the amount of bid guarantee/security will be forfeited.
b. No separate declaration offering discount on price will be allowed. Offered price in the price schedule will
be final.
7.
(A) Estimation of material requirement: The total quantity of materials required is indicated in the BOQ
B) Quantity Variation: There may be increase or decrease in quantity of individual item subject to the
condition that the corresponding change in total contract value does not increase or decrease by more than 10 %
keeping the unit rate of individual material and labour unchanged.
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8. Award of work:
i) The evaluation of bids will be carried out, first of techno-commercial bid and thereafter opening the price bid of
only those bidders who qualify and meet the technical requirements.
ii) Company reserves the right not to order/ award the job to the price-wise lowest party if the party during any part
of evaluation is found technically non responsive.
iii) Work should be started within ten (10) days from the date of issue of the work order, failing which order will
be cancelled without further correspondence.
iv) The line after completion also should be under custody of the contractor till the date of commissioning and
charging. The properties will be taken over by APDCL only after satisfactory commissioning and charging.
9.0 Period of completion: 60(Sixty) days from the date of issue of the work order.
9.1
Implementation schedule:
COMPREHENSIVE IMPLEMENTATION SCHEDULE OF WORK: Construction of 11KV line with A.B.
Cable for Greater Titabor WSS under Golaghat Electrical Division, APDCL, UAR including lying of cables
through existing Railway track crossing by U/G cable under Annual Plan, 2014-15.on “Turnkey” mode.
Survey works
3
4
5
3 days
2
15 days
Signing of Agreement
15 days
1
20 days
Description
2 days
Sl
no.
5 days
EXECUTION PERIOD
Manufacture & supply
of materials
Erection of
equipments
Testing &
commissioning
10. Termination of work order:
Company reserves the right to terminate the work order at any stage in accordance with the Company’s General
Condition of Supply and Erection.
11. Terms of Payment:
11.1
During currency of the Contract, maximum 2(Two) nos. of progressive Bills will be allowed for
progressive Bill should contain items of works which are completed in all respect of supply, erection for the
identified locations. 80% of each progressive Bill shall be paid retaining 20% by the company (APDCL). Final
Bills will be paid comprising balance works beyond the works already claimed in the progressive Bills along with
20% of the amount retained against the progressive Bills subject to testing and commissioning & fulfilment of
clause-14(d).
11.2 All payment shall be made from the office of the CGM (F&A), APDCL on the bill submitted to the concerned
CGM (D) after due verification by the concerned SDE and duly passed by the AGM concerned and countersigned
by the DGM concerned and on submission of work progress report (as per format which will be enclosed at the
time of awarding work order). Bills whether progressive or final shall be entertained only after completion of both
supply and erection of work of specified items.
11.3
Security deposit and agreement:
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The successful bidders shall have to deposit security money in the form of Bank Guarantee issued by any
Nationalized Bank/Scheduled Bank in Company’s standard format on non-judicial stamp of appropriate value for
an amount equal to 2.5% of the contract value at the time of execution of agreement. The security deposit is liable
to be forfeited in case of non-execution of contract/ work order. The security deposit will be released on successful
commissioning and testing of the materials ordered and after depositing performance B/G as per clause 13(d).
12. Project Management and site Organizations:
In Consideration of the tight schedule of the project, the successful bidder(s) /Contractor(s) shall exercise
systematic closely controlled project management system with the aid of commonly used soft tools. Following are
the major activities/deliverables to be organized /generated for submission to the Board.
(I) Liaison/Construction offices will be established in each Circle of APDCL.
(II) Work Progress Report:
 Progress monitoring by the contractor as per implementation schedule and approved milestones.
 Fortnightly progress report will invariably be submitted to the concern Deputy General Manager, Senior
Manager & Sub-Divisional Engineers.
The progress report will highlight the points like, work completion vis-à-vis planned, plan for next working period,
delay analysis vis-à-vis committed schedule with reasons and remedies etc.
(III) Site Organization.
The vendor at each working site shall establish the following.
 Store house
 Site fabrication facilities
 Construction supervision office
All offices shall be adequately furnished and staffed so as to take all site decisions independently without frequent
references to head Work’s/offices.
13. Guarantees and Penalties
a) Liquidated Damages (LD): The proposed work is on top priority of Government of Assam and therefore has to
be completed within stipulated/agreed schedule. Any delay beyond that will attract penalty as per Company’s
general condition of supply and erection.
b) Equipment and system installed shall be guaranteed individually for integrated operations for a period of 18
(Eighteen) months from date of commissioning of the same. In case of detection of any defect in individual
equipment or system as a whole, the same shall be replaced by the vendor free of cost within 15 days of intimation
by the Company’s representative.
c) Warranty from the manufacturer shall be produced along with manufacturer’s test certificate for all equipments/
materials covered under Manufacturers Warranty.
d) A performance Bank Guarantee from a Nationalized Bank/Scheduled Bank in APDCL’s standard format on
Non judicial stamp paper of appropriate value with a validity of 18 (eighteen) months @ 10% of total value of
work executed shall have to be furnished by the Contractor before final payment.
e) All Bank Guarantees (BG) to be submitted as per the clauses above should be from any branch of nationalized or
scheduled Bank of RBI having their regional offices in Assam.
14. Approvals/Clearances:
1. Concerned DGM, APDCL, shall approve all site and documents prepared by the contractor for construction of
the Line.
2. GTP and drawings of all equipment/ materials shall be approved by CGM (D), APDCL (CAR).
3. The contractor shall obtain all statutory approvals and clearances from the statutory authorities before charging
the system at his/her own
15. Environmental Considerations:
While carrying out the assignment, no damage to environment /forests will be caused by the contractor. If so done,
the contractor will have to compensate the same to the satisfaction of the concerned authority.
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16 During project execution
i) All documents for approval shall be submitted in 6 copies
ii) All final documents to be submitted to statutory organization will be furnished as per requirement of the
authority.
17 - Funding of the project;
18. Disclaimer:
Annual Plan, 2014-15
While the Company will make every endeavor to extend necessary facilitation in expediting the work, the
contractor shall be
responsible to organize and arrange all necessary inputs right from mobilization activities up
to completion of the project. Company will not entertain any failure / delay on such accounts. Also, Company will
not be responsible for any compensation, replenishment, damage, theft etc. as may be caused due to negligent
working, insufficient coordination with Government / non Government / Local Authority by the contractor and/ or
his personnel deputed for work. The contractor shall take necessary coverage under LIC/GIC etc. for his working
personnel and the goods in store as well as in transit. The contractor will be deemed to have made him acquainted
with the local working conditions at site(s) and fully provide for into the bid submitted.
Terms and conditions, which are not specified, herein above will be governed by the Company’s General
Terms and Conditions of supply and erection in force.
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Annexure - 1
Tender Proforma part – 1 (Techno-commercial)
Tender Notice No: CGM(D)/APDCL/UAR/TITABOR WSS/2014/01
Due date of Tender:
1. Name and full address of the Tenderer.
2. Particulars of payment made for Purpose of
Tender documents money Receipt No: and Date.
3. Amount of earnest money paid with
Money receipt No and date Deposit No. and Date:
4. Whether Sales Tax and Income Tax
Clearance certificate submitted:
Yes / No
5. Sales Tax Registration No:
6. WCT registration certificate with validity:
7. P.F Registration No.:
8. Acceptance of guarantee clause of
Materials /equipment and system Installed individually
and for integrated operation.
9. Acceptance of penalty clause:
10. Acceptance of terms of payment:
11. Certificate/ documents regarding works
Done with value with last three years if any
(Awarded by APDCL and other successor Companies of ASEB)a separate sheet if required may be enclosed as per Annexure-I(A)
12. Details about carrying out electrification
Work of at least one (one) similar to this work:
13. Details of manpower and T&Ps including
Vehicles available with the firm to be enclosed separately:
14. List of documents enclosed with serial number:
(All enclosures should be in chronological order
as per the list of documents enclosed.)ANNEXURE I(B) .
Signature With full name and designation
of the Bidder / (Authorized person)
Page | 15
ANNEXURE-I(B)
Sl.
No
Qualification requirement
A
LEGAL
1
Document in support of legal status of firm
2
Memorandum of Association & Registered/ Notarized Joint venture Agreement if JV
3
Registered/Notarized Power of Attorney of the signatory of the Bidder to participate in the bid
4
Board resolution of the company to authorized the signatory
5
Information regarding any litigation, current or during the last five yrs. In which the bidder is
involved, the parties concerned, and disputed amount
6
Valid Electrical Contractor License
7
Valid Electrical & Supervisory License
8
VAT/CST/WCT/Service Tax registration certificate
9
Provident fund Registration Certificate
B
Financial
1
Audited Balance Sheet, Profit & loss account, Auditors report for last three yrs.
2
CA certified turnover of bidder during the last 3(three) years
3
Evidence of adequacy of working capital for this contract (access to line(s) of credit &
availability of other financial resources)
4
Authority of seek references from the bidders Bankers
5
Income Tax return for last 3(three) years
6
Value of similar work performed by the bidder in each of the last 5 years-statement
7
Proposals for subcontracting components of the works amounting to more than 10 percent of
the contract price
8
Details of EMD(BK/KVP/TD/NSC/Bank call Deposit)
C
Technical ability and experience
1
Experience in works of a similar nature and volume for each of the last 5(five) yrs & details of
work under way or contractually committed including full address of client for communication
statement
2
Certificate issued by an Engineer not below the cadre of DGM/SE along with supporting photo
copies of agreement for the works executed in in any one year
3
Detailed activity plan & mythology supported with layout & necessary drawing & calculation
(detailed) to allow the employer to review their proposals
4
Quality Assurance plan with Bar Chart
5
List of technical personnel & their qualification & experience with organization chart
6
Proof of availability of the tools,tackles,spareparts etc for carrying out the works
D
Technical particulars of equipments and Materials offered in the Bill of Material and their GTPs
Furnished at
Annexure
Page
Remarks
Page | 16
SECTION-3
BILL OF QUANTITIES
&
PRICE BIDDING SCHEDULE
Page | 17
BOQ for Construction of HT line with A B Cable including lying
of cables through existing Railway track crossing by U/G cable for power supply to
Titabor water supply scheme under Golaghat Electrical Division APDCL UAR under
annual plan,2014-15 on “Turnkey” mode
Length of Line from 33/11KV Golaghat-II S/S to Dhanshri Intake Point
= 2.0 Km.
Length of line from 33/11KV Golaghat-I S/S to Borphukonkhat Pumping Station
= 3.5 Km.
Length of line from 33/11KV Golaghat-I S/S to Oating PWSS Point & Doyang Intake point= 7.5 Km.
Total line Length = 13.0 Km.
Package No. GEC/2014-15/01
(A)
BOQ for per KM construction of 11KV line with A B Cable
( Annexure-A)
Sl.
Item Specification
1
PSC Pole, 9.75Mtr.
Unit
no.
2
Cable ABC 11KV XLPE 3x 120 sqmm with insulated messenger
Mtr.
1100
3
Insulated tapping arrangement kit for HT ABC to DTR or TEE joint single core
Set.
9
4
Straight through joint single core ( heat shrinkable
Set.
6
5
Termination kit outdoor HT-ABC single core ( heat shrinkable)
Set
6
6
Anchor Clamp 3 U Bolt type
No.
15
7
Suspension Clamp 2 U Bolt type
no.
25
8
Eye Hook/ Eye Bolt
No.
40
9
Earth Spike
no.
6
Kg.
20
GGG I Wire 6 SWG
10
Qnty.
30
11
H T Stay set
Set
30
12
Stay wire 7/10 SWG
Kg.
250
13
Pole Clamp
No.
40
14
Danger Plate
No
30
15
Pad Connector
No.
3
16
Cable Tie
No.
400
17
M.S. Channel 100x50x6x2.2M
No
30
18
Nuts & Bolts (assorted)
Kg
40
Page | 18
(B)
Sl.
1
2
3
4
5
6
7
8
9
BOQ of 11KV XLPE Cable with cable kit for Termination of ABC line
Item Specification
11KV XLPE armoured cable 3 core, 120 sqmm
Cable kit, 3 core outdoor for 120 sqmm cable (Heat Shrink)
11KV isolator, 800 A with earth switch with mounting structure
11 KV XLPE armourd cable single core, 185 sqmm for Railway Track
crossing of abandoned 11 KV Bibigaon feeder to facilitate drawl of ABC
line
Cable kit, 1 core outdoor for 185 sqmm XLPE cable. (Heat Shrink)
11 KV LA
HDPE pipe
C. I. Earth pipe
G. I Wire for earthing
Unit
Mtr
No
Set
Qnty.
50
4
3
Mtr
360
No
Set
No
No
Kg
8
5
32
8
20
Page | 19
Annexure - II
Tender Proforma part-II (Price Bid)
NIT No. CGM (D)/APDCL/UAR/TITABOR WSS/2014/01
Proforma for unit rate inclusive of all duties & taxes in respect of supply, erection, testing and commissioning
Sl.
No
1
Item
2
A
Construction of 11Kv line with A. B. Cable,
line length = 13.0Km.
1
Supply & erection of 9.75M P.SC. pole perpendicular
to ground level including excavation of earth pit having
depth 1/6 in the length of pole and a cross section of
0.65 Mtr. X 0.65 Mtr with edge brick soling, bolder
packing, including complete with refilling with soil &
ramming as per TS
2
Supply and stringing of HT 11KV Grade (3x120 )
sqmm AB Cable with alluminium conductor & standard
insulated messenger conductor with all alluminium
alloy and phase conductor being insulated with XLPE
( sioplas) including insulated tapping arrangement kit
for HT ABC to DTR or TEE joint, heat shrinkable of
straight through joint & termination kit outdoor HT ABC
single core and necessary 3U bolt type Anchor clamp,
2 U bolt type suspension clamp and as required of
pad connector & cable Tie as per TS and as directed
Unit
Qty
3
4
NO
390
KM
14.3
FORD cost of
materials.
erection of materials
& testing &
commissioning
Unit Rate
Total
Unit Rate
Total
5
6=(4x5)
7
8=(4x7)
Total
Price
(Rs)
9= (6+8)
Work
contract
tax (Rs)
Service
Tax (Rs)
10= (9 x
Rate)
11= (8 x
Rate)
Grand Total (Rs)
12=(9+10+11)
Page | 20
and standard sagging in each and every span.
3
Supply, fitting & fixing of H T stay set complete
including digging of earth pit of area 0.9 m x 0.6m and
depth 1.4 M placing in stay rod with G I stay wire &
guy insulator on the pole clamps, fixing thimble bow
with boulder packing & hard ramming to fill up have
the pit and earth packing up to ground level including
supply of boulder,clamps,nuts & bolts as per TS
SET
390
4
Supply fitting & fixing of H T danger plate on pole as
directed.
NO
390
B
Referred Annexure (A) for standard BOQ for per KM
AB Cable line
C
Termination of ABC Line Both Panel & DTR
Mtr
50
Supply, fitting & fixing cable Kit,3 core outdoor for 120
sqmm cable (Heat Shrink) for termination both at
panel & DTR.
No
4
Supply, fitting & fixing of 11 KV Isolator with Earth
switch with mounting structure over PCC foundation
including concreting of foundation & supply of
necessary clamps, nuts & bolts as per TS and to
ensure smooth operation of fixed contact & moving
blade.
Set
5
6
7
Supply, fitting, fixing & commissioning of 11KV XLPE
armourd cable, 3 core, 120 sqmm for termination both
at panel & DTR.
3
Page | 21
8
9
Supply fitting & fixing of 11 KV L.A (9KN) on M.S.
channel cross arm with drilling of holes as per
requirement at site & TS.
Supply & Laying of cable with 185 Sq Mm 1 core
11KV XLPE U/G cable through existing Railway Track
crossing ( at the abandoned 11KV track crossing of
the erstwhile 11KV Bibigaon feeder) with fitting of
cable end box (OUTDOOR, Heat Shrink type) of
required capacity including supply & fitting of HDPE
pipe (6Kg/cmsq), cable marker etc. as per direction &
TS.
SET
5
Mtr.
360
01 (one) no. crossing.
10
Supply & fitting of cable Kit, 1 core outdoor for 185
sqmm XLPE cable (Heat Shrink)
No
8
11
Supply, fitting & fixing C I earth pipe by digging of pit
as per specification making the G I 6swg in turns (coil)
and putting the earth pipe with necessary connection
as per TS
NO
8
Signature with full name
And designation of the Bidder
(Authorized person)
Page | 22
SECTION-4
GENERAL REQUIREMENTS
Page | 23
GENERAL REQUIREMENTS
The bidder shall comply with the following general requirements along with other
specifications.
1.0
QUALITY ASSURANCE PLAN
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 test and inspection.
xi)
List of testing equipment available with the bidder for final testing of equipment
specified and test plant limitation, if any vis-à-vis the type. 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
requirement.
1.02
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 certificated of the raw material and bought out accessories if
required by the purchaser.
iii)
Quality Assurance Plant (QAP) with hold points for purchasers’ inspection.
QAP and purchasers hold points shall be discussed between the purchaser
and contractor before the QAP is finalized.
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 sub-contractor.
1.01
1.03
The Quality Assurance Programmed shall give a description of the Quality
System and Quality Plans with the following details.
i)
Quality System
The structure of the organization.
The duties and responsibilities assigned to staff ensuring quality of work.
The system of purchasing, taking delivery of verification of materials
Page | 24
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
contractor’s 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 contractor’s 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.
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 personnel free of cost. However, travel and incidental charges of the
personnel will be borne by the purchaser.
3.0
Inspection
2.0
3.01
The Owner's representative or third party nominee shall at all times be
entitled to have access to the works and all places of manufacture, where
insulator, and its component parts shall be manufactured and the
representatives shall have full facilities for unrestricted inspection of the
Contractor's and sub-Contractor's works, raw materials, manufacture of the
material and for conducting necessary test as detailed herein.
3.02
The material for final inspection shall be offered by the Contractor only
under packed condition as detailed in the specification. The Owner shall
select samples at random from the packed lot for carrying out acceptance
tests. Insulators shall normally be offered for inspection in lots not exceeding
5000 nos. the lot should be homogeneous and should contain insulators
manufactured in the span of not more than 3-4 consecutive weeks.
The Contractor shall keep the Owner informed in advance of the time of
starting and the progress of manufacture of material in their various stages so
that arrangements could be made for inspection.
3.03
3.04
3.05
No material shall be dispatched from its point of manufacture before it has
been satisfactorily inspected and tested unless the inspection is waived off by
the Owner in writing. In the latter case also the material shall be dispatched
only after satisfactory testing for all tests specified herein have been
completed.
The acceptance of any quantity of material shall be no way relieve the
Contractor of his responsibility for meeting all the requirements of the
specification and shall not prevent subsequent rejection, if such material are
later found to be defective.
Page | 25
4.0
Additional Tests
4.01
The Owner reserves the right of having at his own expense any other test(s)
of reasonable nature carried out at Contractor's premises, at site, or in any
other place in addition to the type, acceptance and routine tests specified in
these bidding documents against any equipments to satisfy himself that the
material comply with the Specifications.
4.02
The Owner also reserves the right to conduct all the tests mentioned in this
specification at his own expense on the samples drawn from the site at
Contractor's premises or at any other test center. In case of evidence of noncompliance, it shall be binding on the part of the Contractor to prove the
compliance of the items to the technical specifications by repeat tests or
correction of deficiencies, or replacement of defective items, all without any
extra cost to the Owner.
Test Reports
5.0
5.01
Copies of type test reports shall be furnished in at least six (6) copies along
with one original. One copy shall be returned duly certified by the Owner
only after which the commercial production of the concerned materials shall
start.
5.02
Copies of acceptance test reports shall be furnished in at least six (6) copies.
One copy shall be returned duly certified by the Owner, only after which the
material shall be dispatched.
5.03
Record of routine test reports shall be maintained by the Contractor at his
works for periodic inspection by the Owner's representative.
5.04
Test certificates of test during manufacture shall be maintained by the
Contractor. These shall be produced for verification as and when desired by
the Owner.
List of Drawings and Documents:
6.0
6.01The bidder shall furnish the following along with bid.
i)
Two sets of drawings showing clearly the general arrangements,
fitting details, electrical connections etc.
ii)
Technical leaflets (user’s manual) giving operating instructions.
iii)
Three copies of dimensional drawings of the box for each quoted
item.
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.
Approval of drawings/work by purchaser shall not relieve the supplier of his
responsibility and liability for ensuring correctness and correct interpretation of the
drawings for meeting the specification.
6.02 The requirements of the latest revision of application standards, rules and
Page | 26
codes of practices. The equipment shall conform in all respects to high standards
of engineering, design, workmanship and latest revisions of relevant standards at
the time of ordering and purchaser shall have the power to reject any work or
materials which, in his judgment is not in full accordance therewith.
6.03 The successful Bidder shall within 2 weeks of notification of award of
contract submit three sets of final versions of all the drawings as stipulated in the
purchase order for purchaser's approval. The purchaser shall communicate his
comments/approval on the drawings to the supplier within two weeks. The
supplier shall, if necessary, modify the drawings and resubmit three copies of the
modified drawings for their approval. The supplier shall within two weeks.
Submit 30 prints and two good quality report copies of the approved drawings
for purchaser's use.
6.04 Eight sets of operating manuals/technical leaflets shall be supplied to each
consignee for the first instance of supply.
6.05
One set of routine test certificates shall accompany each dispatch
consignment.
6.06
The acceptance test certificates in case pre-dispatch inspection or
routine test certificates in cases where inspection is' waived shall be got
approved by the purchasers.
7.0 Any Item specification if not available in this document Contractor shall supply and
execute the items meeting the relevant IS specification with the approval of the
purchaser
Page | 27
SECTION-5
STANDARD TECHNICAL
SPECIFICATION
.
Page | 28
6.2
1.0
TECHNICAL SPECIFICATION FOR EXECUTION OF WORK (FOR 11KV
LINES)
SCOPE: ERECTION OF 11 KV LINES WITH 9.75 M P.S.C. POLES
The scope covers the survey of the proposed route, tree clearance wherever
necessary transport of materials to the locations, erection of the line testing of
the line and handing over to the APDCL (UAR) as per specification. Materials
such as steel, cement, top cleats, clamps, washers, earth wires, HBG metal,
sand, water, cost of bolts and nuts etc., as given in Annexure-1 are to be
procured by the contractor cost of which shall be included in the bid.
2.0
General :
The Contractor should be well acquainted with the IE Rules 1956 as amended
from time to time and with the Indian Telegraph Act 1889 so that necessary
provisions therein may be followed.
1.0 SURVEY OF THE ROUTE:
The Tentative route map of the line to be erected will be furnished by the APDCL
(UAR) to the Contractor along with the copy of the concluded agreement.
The Contractor is required to carry out the detailed survey of the route of the line
and fix up the locations at the average span indicated in the schedule and mark
the locations and submit a detailed route map to the Engineer in charge of the
work within 30 days for approval. In the course of surveying by the contractor,
any conspicuous variations in the change and physical feature to those indicated
in the route map and as actually existing are noticed, the deviations must be
brought to the notice of the APDCL (UAR) Engineer. The APDCL (UAR)
Engineer if considered necessary shall make alterations, which shall be carried
out accordingly and the APDCL (UAR) after inspecting the surveyed route and
the revised route map shall be given for final approval in writing. The contractor
shall not commence the work until the final approval of the route map is given by
the Engineer in charge in writing to the contractor.
2.0
WAY LEAVES AND TREE CUTTINGS
Proposals for way leaves and right of way shall be submitted by the contractor.
Permission will be obtained by the APDCL (UAR) within reasonable time for
which due notice shall be given by the Contractor. The Contractor shall arrange
for tree cutting or tree branches cutting also.
The widths of tree clearance to be adopted for lines of various voltages are as
detailed below:
Page | 29
a) 11 KV LINE
All growth within 6.096 M (20 ft) from the center line of support and all trees
which may fall and foul the line.
The Contractor shall take all possible steps to see that standing crops, etc.
are not damaged while attending to tree cutting. When such damage is
inevitable the compensation will be borne by the APDCL (UAR) provided the
damage is with the prior concurrence of the Engineer. The Contractor shall
bear the compensation for damage caused by the gangs without prior
concurrence of the Engineer concerned.
No trees shall be cut until the APDCL (UAR) has made necessary
arrangement with the authorities concerned and permission is given to the
Contractor to fell such trees. The contractor shall arrange to remove the
obstacles as soon as possible.
At such times, when it may not possible for APDCL(UAR) to arrange right-ofway for excavation of pole pits or erecting the poles of stringing the line, then
at all such times, the contractor shall shift his gangs to other areas. The rates
quoted shall cover all such contingencies and no extra payments shall be
claimed for such contingencies.
3.0 EXCAVATION OF POLE PITS, STAY PITS AND D.P. PITS
After the final survey of the line and after marking the pole locations
with pegs, excavation work has to be commenced in accordance to the
approved route map. Excavation is generally done by pick axes, crow Vbars and showers although sometimes earth augers are used. Excavation
of pole pits in very hard or rocky soil or in rock beds, may involve blasting
with suitable explosives. The pits for the supports are excavated in the
direction of the line as this will facilitate the erection of support are
excavated in the direction of the line as this will facilitate the erection of
support, in addition to giving greater lateral stability, the depth of the
foundation to be excavated for poles shall be in accordance with relevant
sketch for the erection of pole or stay of D.P. etc.
3.01
4.0 ERECTION OF SUPPORTS
After the excavation of pits is completed the supports to be erected may be
brought to the pits location. Then the pole may be erected inside the pit. Wooden
support may be utilized to facilitate lifting of the pole at the pit locations.
Before the pole is put into pit, RCC padding may be laid below the pole to
increase the surface contact between the pole and the soil. The padding will
distribute the weight of the pole uniformly on the soil.
Having lifted the pole, the same should be kept in a vertical position with the help
of manila rope of 25 mm dia. using the rope as a temporary anchor.
As the poles are being erected say from the pole already erected to the next
location where the pole is being erected, the alignment of the poles are to be
Page | 30
checked and set right by visual check. The verticality‟s of the poles are to be
checked with a spirit level on both transverse and longitudinal directions.
Having satisfied that the verticality and alignment are all right, earth filling or
concreting is to be done.
In swampy and special locations, however, before earth filing, the poles are to be
concreted up to ground level of the pit.
After the poles have been set the temporary anchors are to be removed. The
supports shall be buried to a depth as per sketch enclosed.
5.0
ERECTION OF D.P. STRUCTURES FOR ANGLE LOCATIONS (FOR 11 KV
LINES):
Generally, for angles of deviation more than 20° double pole structures of
spacing 1.2 mts (4.0 ft) may be erected. The pits are to be excavated as per
bisection of the angle of deviation.
After the poles are erected, the horizontal / cross bracing should be fitted and the
supports held in a vertical position with the help of temporary guys of manila rope
of at least 25 mm dia. Ensuring that the poles are held in a vertical position (this
can be checked with a spirit level) the concreting of the poles with cement,
granite chips of size 20/30 mm mesh and sand in the ratio M400 conforming to
ISS is to be done from the bottom of the support to the ground level. Before
lifting the pole in the pit, concrete padding of not less than 75 mm thickness may
be put for the distribution of the load of the support on the soil.
After the concreting is done, the pit may be filled with earth after curing of the
concrete is completed.
Four stays along the line, two in each direction and two stays along the bisection
of angle of deviation are to be provided.
Stay concreting may be done with M 400 concrete mixture.
The D.P. shall be erected as per the sketch enclosed.
6.0
ANCHORING AND PROVIDING GUYS FOR SUPPORTS
Guys are to be provided to the supports at the following places (i) Angle
locations, (ii) Dead end locations, (iii) Tee-off points, (iv) Steep gradient locations
to avoid uplifted on the poles.
The installation of guy will involve the following works:
Excavation of pit and fixing of stay rod.
Fastening guy wire to the support.
Tightening guy wire and fastening to the anchor
The marking of the guy pit for excavation, the excavation of pits and setting of
the anchor rod must be carefully carried out. The stay rod should be placed in
i)
ii)
iii)
Page | 31
the position such that the angle of inclination of the rod with the vertical face of
the point is 30°/45° as the case may be. The concreting of the stay at the bottom
should then be carried out. The back filling and ramming must be well done
thereafter, and allowed to set for at least 7 days. The free end of the guy wire is
passed through the eye of the anchor rod, bent back parallel to the main portion
of the guy and bound after inserting the G.I. Thimble. The loop is protected by
the G.I. Thimble, where it bears on the anchor rod. Where the existence of guy
wire proves hazardous, it should be protected with suitable asbestos pipe, filled
with concrete of about 2 mts length above the ground level, duly painted with
white and black stripe so that it may be visible at night. The turn buckle shall be
mounted at the pole end of the stay and guy wire so fixed that the eye bolt turn
buckle is half way in the working position, thus giving the maximum movement
for tightening or loosening.
Guy insulators are placed to prevent the lower part of the guy from becoming
electrically energized by a contact of the guy when the conductors snap and fall
on them of due leakage. No guy insulator shall be located less than 2.6 mts. from
the ground.
The anchoring and providing guys for supports (Single guy Bow guy fly guy) shall
be done as per sketch enclosed. Bow guy and fly guy shall be provided as per
field conditions.
7.0
7.1
STRINGING OF THE LINE CONDUCTORS
For the guidance of the contractor certain do‟s and don‟ts are given below
before the workmen actually commence the stringing work.
7.2 Do’s and Don’ts
DO’s
i.
ii.
iii.
iv.
v.
vi.
vii.
viii.
ix.
x.
Use proper equipment for handling aluminum conductors at all
times.
Use skids, or similar method for lowering reels or coils from
transport or ground.
Examine reel before unreeling for presence of nails or any other
object, which might damage the conductor.
Rotate the reel or coil while unwinding conductor.
Grip all strands while pulling out the conductor.
Control the unreeling speed with suitable braking arrangement.
Use wooden guards of suitable braking arrangement.
Use long straight, parallel jaw grip with suitable liners when
pulling conductor thus avoiding nicking or kinking of the
conductor.
Use free running sleeves or blocks with adequate grooves for
drawing/paving conductors.
Use proper sag charts.
Page | 32
xi.
xii.
xiii.
xiv.
Mark conductors with crayons or adhesive tape of such (other)
material, which will not damage the strand.
Make all splicing with the proper tools.
Use a twisting wrench for twisting the joints.
Chromites or graphite conducting oxide-inhibiting grease should
be used before cleaning with wire brush.
DON’Ts
i.
ii.
iii.
iv.
v.
Do not handle conductors without proper tools at any stage.
Do not pull conductors without ensuring that there are no
obstructions on the ground.
Do not pull out excess quantity of conductor than is required.
Do not make jumper connections on dirty or weathered
conductor.
Do not handle aluminum conductors in a rough fashion but
handle it with care it deserves.
8.0 CONDUCTOR ERECTIONS
8.1
The erection of overhead line conductor is a very important phase in
construction. The erection of conductors can be sub-divided into 4 separate parts as
follows:
Transport of conductors to work site.
Paving and stringing of conductors.
Tensioning and sagging of conductors.
Joining of conductors.
At the important crossing of roads, canals, navigable rivers, railways etc.,
flagmen should be in attendance to ensure that normal services are not
unduly interrupted. These crossing should only be carried out in conjunction
with and with the approval of the proper authorities concerned.
The conductor drums shall be transported to the tension point without injuring
the conductor, if, it is necessary to roll the drum on the ground for a small
distance, it should be slowly rolled in the direction of the marked on the drum.
The drum should be so supported that it can be rotated freely. For this
purpose the drum should either be mounted on the cable drum supports of
jacks or hung by means of chain pulley of suitable capacity, suspended from a
tripod. In case if it is not possible to raise the conductor drum by any of the
above method, a trench of suitable depth slightly bigger than the conductor
drum may be dug, so as to facilitate free rotation of the cable drum when it is
suspended in the trench by means of M.S. Shaft. While paving, care should
be taken to see that conductor does not rub against any metallic fitting of the
pole or on the bad/rocky ground. Wooden trusses should be used for this
purpose to support the conductor. The conductor should be passed over the
poles on wooden or aluminum snatch pulley blocks provided with low friction
bearings. While conductor is being paved out slowly, some braking
i.
ii.
iii.
iv.
Page | 33
arrangement should be made so that the rotation of the drum may be stopped
in emergency.
In case the length of one piece of the conductor is less than the length of the
section in which conductor paving is being done, it is easy to stretch one
length of all phases from one end the remaining length from another end of
the section any part of the conductor shall be left at a height of less than that
of 5 meters, above the ground by rough sagging.
8.2
Mid Span Jointing of Conductors
The mid span jointing of conductors can be carried by twisting the joint at the
ends and the wire should project a few centimeter, beyond the end of the
sleeves. The projected wires are given a sharp bend to keep them from
slipping out of the sleeve. The end of the sleeves are then held tightly by
twisting wrenches and then 4 to 5 turns in one direction generally anti-clock
wise direction. Crimping Tools are preferably to be used for joints and
jumpers.
8.3
SAGGING AND TENSIONING
On the completion of the paving of the conductors and making mid span joints
if any, tensioning operations will commence. Temporary guys will have to be
provided for both the anchoring supports in the section where the stringing
has to be done. At the tensioning end, one of the conductors is pulled
manually up to a certain point and then come along clamp is fixed to the
conductor to be tensioned. The grip to the come along clamp is attached to
double sleeve pulley block or the pulley lift machine and gradually tensioned.
The conductor should then be sagged in accordance with the sag temperature
chart for the particular conductor and span. The sag should then be adjusted
in the middle span of the section. The sag chart is to be provided. The stretch
of the conductor has to be taken out before stringing in order to avoid the
gradual increase in sag due to the setting down of the individual wires. There
are ways of accomplishing this:
a) Pre-stressing
In this method the conductor is pulled up to tension considerably above the
correct figures, but never exceeding 50% of breaking load for a short period of
say twenty minutes. As this method requires more time and involves the use
of stronger tackle to secure the higher tension the other method of over
tensioning is commonly adopted.
Page | 34
B) Over-tensioning
This method consists of pulling up the conductor to a tension a little above the
theoretical tension for prevailing temperature and fixed it up at that tension
with correspondingly reduced sag. After a certain time the conductor will settle
down to the correct sag and tension. A tension of five to eight percent more
than the theoretical value has been found to be suitable for the sizes of ACSR
and AAAC conductors standardized by REC. The ambient temperature during
sagging may be recorded correctly.
Conductors can be sagged correctly only when the tension is the same in
each span throughout the entire length of section. Use of snatch blocks
reduces the friction and chances of inequality of tension in various spans.
Sagging can be accomplished by several different methods but most
commonly used method is “Slighting”. The slighting sag method of measuring
sag is by the use of targets placed on the supports below the cross arms. The
targets may be light strip of wood clamped to the pole at a distance equal to
the sag below the conductor when the conductor is placed in snatch block.
The lineman sees the sag from the next pole. The tension of the conductor is
then reduced or increased, until the lowest part of the conductor in the span
coincides with the lineman‟s line of sight.
When sagging is completed, the tension clamps shall be fixed. The clamp can
be fitted on the conductor without releasing the tension. A mark is made on
the conductor at a distance from the cross-arm equal to the length of
complete strain insulator. Before the insulator set is raised to position, all nuts
should be free. Come along clamp is placed on the conductor beyond the
conductor clamp and attached to the pulling unit. The conductor is pulled in
sufficiently to allow the insulator assembly to be fitted to the clamp. After the
conductor is clamped to insulator, assembly unit may be released gradually.
If the tension is released with a jerk, an abnormal stress may be transferred to
conductor and support, which may result in the failure of the cross arm, stay
or pole in some cases. After the stringing is completed, all poles, cross arms,
insulators, fittings etc. are checked upto ensure that there have been no
deformities etc.
The next step is to place the conductor on the top of the pin insulator from the
snatch block and removing snatch blocks. Conductors are then fastened to
insulator by the use of aluminum wires. The following points should be
observed:
i)
ii)
Proper size of the tie binding wire which can be readily handled
and with adequate strength is to be used.
The length of tie wire should be sufficiently long for making
complete tie including the end allowances for gripping with ends.
Page | 35
A good tie should provide a secure binding between the line
conductor and insulator and should reinforce the conductor on
either side of the insulator.
iv)
The use of cutting pliers for binding the tie wire should be avoided.
v)
The tie wire which has been used previously should be reused
Before tying the conductor to the insulator two layers of Aluminum tapes
should be wrapped over the conductor in the portion where it touches the
insulator. The width and thickness of aluminum tape to be used for a specific
size of conductors has been specified in hand books of aluminum conductor
manufacturers and the same be referred to. The Aluminum tapes should also
be used at the tension clamp and for proper grip.
iii)
Normally in straight runs of line, the conductors are run on the top of
insulators. When there is small of deviation the conductor is placed inside
groove and bound. Accordingly, there are two methods of tying the
conductors to insulators. The binding wire/tie wire has to be procured by the
contractor and the bid price shall include the cost of this.
8.4
The contractor shall be entirely responsible for any damage to the supports,
other accessories and conductor. He shall also be responsible for proper
distribution of the conductor drums to keep number and lengths of cut pieces of
the conductor to a minimum.
8.5 CONDUCTOR DAMAGE AND REPAIR
If the conductor is damaged for whatever reasons, and damage is not
repaired by aluminum sleeves, etc., it shall be brought to the notice of the
Engineer and shall not be used without his approval. Even repairing of
conductor surfaces shall be done only in case of minor damages, scuff marks
etc., which are safe from both electrical and mechanical points of view. The
final; conductor surface shall be clean, smooth, without any projection sharp
points, cut or abrasion etc. giving satisfactory corona and R.I. performance.
8.6 No joints or splice be made in span‟s crossing over main roads, railways, small
rivers or intension spans. Not more than one joint per conductor shall be allowed in
one span. The strength of the joint shall conform to IE Rule 75.
8.7 STRINGING.
Whatever necessary ground clearances have to be measured to ensure
obtaining adequate line clearance as per IE Rule 77 (i)
9.0 EARTHING
9.01 Pipe Earthing
At D.P Locations, Pits are to be excavated the steel and metal parts are to be
earthed by pipe earthing as per the drawing or sketch enclosed to this
Page | 36
specification. Duly filling the pits with finely broken coke having granule sizes
not more than 25 mm thick. The coke shall be maintained up to a distance of
300 mm for the pipe on all sides. The top edge of the pipe shall be at least
200 mm below the ground level. The CI strips shall be fixed not less than 300
mm deep from the ground level.
The tenders shall quote the charges for earthing inclusive of the cost of coke,
excavation and back filling.
12.01 Pole Earthing: Supports shall be properly earthed.
10.0 CONCRETING
13.01 The cement concrete used for the foundations shall be of M 400 grade.
13.02 The full concreting for the poles if erected in excavated act shall be
done so that the complete block will be of dimensions( 0.6 X 0.6 X 1.6) +
0.2 X 0.2 Mtr. (0.6 X 0.6 X 1/35) + 0.2 X 0.2 X 0.2 Mtrs. so as to maintain
as exposed portion for 0.2 Mtrs height above the ground level.
13.03 If augur is used for making pole pits, ramming shall be done after
erection of pole.
11.0 WORKMANSHIP
The contractor shall entirely be responsible for correct erection of all support
as per the approved drawings, and their correct setting and alignment, as
approved by the engineer. If the supports and D.P. structures after the
erection are found to differ from approved route maps and drawings or to be
out of alignment, the contractor shall dismantle and re-erect them correctly at
his own cost without extension of time. The supports must be truly vertical and
in plumb after erection and no straining will be permitted to bring them to
vertical position. Verticality of each support shall be measured by the
contractor and furnished to the Engineer.
12.0
Location numbers for each pole shall be painted on the pole.
Anti-climbing devices and danger boards are to be provided at all railway
crossings and road crossings. No extra charges shall be admissible even
though separate gangs may have to be sent by the contractor for fitting these
accessories and attachments on the support at the appropriate time.
13.0
FINAL CHECKING, TESTING AND COMMISSIONING
After the completion of the work final patrolling and checking of the line shall
be done by the contractor to ensure that all foundations work, pole erection
and stringing have been done as approved by the Engineer, and also to
Page | 37
ensure that they are completed in all respects. Contractor shall prepare pole
schedules and hand it over to the Engineer. All works shall be thoroughly
inspected keeping in view of the following main points.
Sufficient back filled earth is lying over each foundation pit and it is
adequately compacted.
ii)
Concreting and coping of poles are in good and finally shaped
conditions.
iii)
All the accessories and insulators are strictly as per drawings and are
free from any defects or damages, what-so-ever.
iv)
All the bolts and nuts should be of G.I material and as per contractual
provisions.
v)
The stringing on the conductor has been done as per approved sag
and desired clearances are available.
vi)
No damage, minor or major to the conductor, earth wire, accessories
and insulator strings still unattended are noticed.
vii)
For all points double jumpers shall be provided to each phase. The
jumpers provided at the cut points are connected rigidly to the tension
hardware utilizing all the jointing bolts provided for the purpose.
The contractor shall submit a report to the above effect to the Engineer. In
case, it is noticed later that some or any of the above are not fulfilled the
Engineer will get such items rectified through other agencies and recover the
cost of such works from the bills payable to the contractor against that
contract or any other contract executed by him for APDCL(UAR).
i)
After final checking, the lines shall be tested for insulation in accordance with
tests prescribed by the Engineer. All arrangements for such testing or any
other tests desired by the Engineer shall be done by the Contractor and
necessary labour, transport and equipment shall be provided by him. Any
defects found out as a result of such tests, shall be rectified by the Contractor,
forthwith, without any extra charges to APDCL (UAR).
In addition to the above, the Contractor shall be responsible for testing and
ensuring that the total and relative sags of the conductors are within the
specified tolerance. Such tests shall be carried out at selected points along
the route as required by the Engineer and the Contractor shall provide all
necessary equipment and labour to enable the tests to be carried out.
The APDCL (UAR) will arrange statutory inspection of the line and indicate
the defects noticed. The Contractor has to rectify all such defects and intimate
to APDCL (UAR) Engineer.
After satisfactory tests on the line and an approval by the Engineer the line
shall be energized at full operating voltage before handing over.
Page | 38
14.0
SUPPLY OF CONSTRUCTION MATERIALS BY THE CONTRACTOR
The Contractor has to make his own arrangements for procurement, supply
and use of construction materials like cement, M.S. rods, HBG metal and
sand.
14.1
CEMENT
The contractor has to make his own arrangements for the procurement of
cement to require specifications required for the work subjected to the follows:
a) The contractor shall procure cement, required for the works only from
reputed cement factories (Man producer) acceptable to the Engineer-inCharge. The contractor shall be required to be furnished to the Engineer-in –
Charge bills of payment and test certificates issued by the manufacturers to
authenticate procurement of quality cement from the approved cement
factory. The contractor shall make his own arrangement for adequate storage
of cement.
b) The contractor shall procure cement in standard packing of all 50 kg per
bag from the authorized manufactures. The contactor shall make necessary
arrangement at his own cost to the satisfaction of Engineer-in-Charge for
actual weighment of random sample from the available stock and shall
conform to the specification laid down by the Indian Standard Institution or
other standard foreign institutions as the case may be. Cement shall be got
tested for all the tests as directed by Engineer-in-Charge at least one month in
advance before the use of cement hags brought and kept on site
Go
down. Cement bags required for testing shall be supplied by the contractor
free of cost. However, the testing charges for cement will be borne by the
APDCL (UAR). If the tests prove unsatisfactorily, then the charges for cement
will be borne by the contractor.
c) The contractor should store the cement of 60 days requirement at least one
month in advance to ensure the quality of cement so brought to site and shall
not remove the same without the written permission of the Engineer-inCharge.
The contractor shall forthwith remove from the works area any cement that
the Engineer-in-Charge may disallow for use, an account of failure to meet
with required quality and standard.
d) The contractor shall further, at all times satisfy the Engineer-in-Charge on
demand, by production of records and books or by submission of returns and
other proofs as directed, that the cement is being used as rested and
approved by Engineer-in-Charge for the purpose and the contractor shall at all
times, keep his records upto date to enable the Engineer-in-Charge to apply
such checks as he may desire.
Page | 39
(a)
Cement which has been unduly long in storage with the contractor or
alternatively has deteriorated due to inadequate storage and thus become unfit
for use in the works will be rejected by the department and no claim will be
entertained. The contractor shall forthwith remove from the work area, any
cement the Engineer-in-Charge may disallow for use on work and replace it by
cement complying with the relevant Indian Standards
14.2
STEEL
The contractor shall procure mild steel reinforcement bars, high yield strength
deformed(HYSD) bars, rods and structural steel etc. required for the works
only from the main or secondary producers manufacturing steel to the
prescribed specifications of Bureau of Indian Standards or equivalent and
licensed to affix ISI or other equivalent certification marks and acceptable to
the Engineer-in-Charge. Necessary ISI list certificates are to be produced to
Engineer-in-Charge before use on works. The unit weight and dimensions
shall be as prescribed in the relevant Indian Standard specification for steel.
All salvaged materials are to be recorded and handed over to the
Engineer in charge. Due certificate to this effect must be obtained for
passing of bills.
15.0
INFORMATION AND DATA
a) The information furnished is the best available however, the APDCL(UAR)
does not guarantee the correctness of interpretations, deductions or
conclusions which are given as supplementary information in the Bid
Documents or in any reports, maps, drawings, diagrams or in other
reference information available to the bidder from APDCL(UAR) of or
otherwise.
The information has been produced as found, communicated to
ascertained or otherwise/learned by the APDCL (UAR).
b) it will be the Bidder‟s responsibility to satisfy himself from the “Reference
Information” supplied and or inspection of the site that sufficient quantities
of construction materials required for the works shall exist in the
designated borrow areas or quarry sites.
The APDCL (UAR) does not accept any responsibility either in handing
over the quarries or procuring the materials or any other facilities. The
Tenderer will not be entitled for any extra rate or claim for the misjudgment
on his part for the quantity and quality of materials available in the
quarries.
Failure by the Bidder to have done all the timings which is in accordance
with this condition he is deemed to have done shall not relieve the
successful Bidder of the responsibility for satisfactorily completing the work
as required at the rates quoted by him.
Page | 40
Page | 41
SECTION -6
GUARANTEED TECHNICAL
PARTICULARS
Page | 42
GUARANTEED TECHNICAL PARTICULARS FOR PSC POLES [9.75M,]
(To be filled in by the bidder)
SL
NO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
ITEM
Name and address of
manufacturer
Type of Pole
Applicable Standard
Length of pole
Depth of Plantation
Bottom Depth
Top Depth
Breath
Diameter of pre-stressing wire
No. of tensioned wire per pole
Minimum Ultimate Tensile
strength of 4 MM HT wire
Minimum initial pull of 4 mm
wire
Spacing HT wires
Quantity of HT wire/ pole
Min Quantity of cement
Quantity of Stone chips
Quantity of sand
Link & spiral
M.S spiral
Maximum Aggregate size
Total weight per pole
Minimum clear cover
Factor of safety
Concrete grade
Ultimate Load
Earthing shall be provided by 4
MM dia. Galvanized iron wire
embedded in concrete
one marks to be provided at
ground level
28 days cube strength of
concrete
( Min) as per IS :
456/2000.
PARAMETERS
Parameters
9.75 M PSC pole
8.5 MT PSC Pole
Page | 43
GUARANTEED TECHNICAL PARTICULARS FOR 11 KV LIGHTNING ARRESTORS
(To be filled in by the Tenderer)
Sl. No.
1
Description
Name & Address of Supplier & Manufacturer
Surge Arrestor
Line Disconnector
Metal Oxide Block
Terminal Clamp
2
Name & address of collaborator, if an
3
Standard to which surge arrestors conforms
4.0
Surge Arrestor
4.1
Voltage rating (KV rms)
4.2
Continuous Operating Voltage (KV rms)
a) Continuous Operating Voltage (KV rms)
b) Leakage current at continuous operation voltage
c) Permitted leakage current of arrestor beyond which
arrestor is faulty.
5
6
Frequency (Hz.)
Nominal discharge current (wave shape – 8/20 micro second)
(KA)
7
Pressure relief rated current (KA rms)
8.
Steep current protection level at 10 KA
a) Lightning impulse protection level with 40 X 80 mico-sec.
Wave at 500/1000 A
9
Long duration current impulse withstand capacity and virtual
duration
10
Line discharge class
11
Thermal runway limit arrestor
12
Energy capability (kj/KV)
13
Pressure relief rating
14
Dry arcing distance
15
Reference current and reference voltage
16
Arrestor Housing
16.1
Power frequency one minute wet withstand voltage (kV rms)
16.2
Lightning impulse dry withstand voltage (kVP)
16.3
Creepage distance
a) Protected
b) Total
Particulars
Page | 44
16.4
Short Circuit withstand capacity
16.5
Bending moment (mm)
17
Dis-connector
a) Constructional Details
b) Other information as applicable to surge arrestor
18
Surge Monitor
a) Constructional Details
b) Degree of protection
19
Suitable for hot line washing
20
Dimension and Weight
G.A Drawing indicating height of complete unit from base to
line, minimum recommended center to center spacing,
21
clearance from ground equipment at various height of
Arrestor, earthing arrestor, earthing arrangement on earthed
side of arrestor etc.
22
23
24
Details of Packing
License number and date for using ISI certification mark if
any
Ammeter for discharge current
a) Type & Make
b) Accuracy
c) Range (mA)
25
Residual voltage
26
Follow Current
27
PERFORMANCE GUARANTEE
Page | 45
GUARANTEED TECHNICAL PARTICULARS OF H.T. & LT GUY INSULATOR
S.NO.
PARAMETER
1
Manufacturer‟s Name & Address
2
Type of insulator
3
Standards to which insulator will conform
4
Dimensions
5
Hole diameter (mm)
6
Color of glaze
7
Dry Power Frequency withstand Voltage (kV)
8
Wet Power Frequency withstand Voltage (kV)
9
Minimum failing load (Newton)
10
Minimum Creepage distance (mm)
11
Weight per piece (Kg)
12
Temperature cycle test (as per ISS)
13
Porosity test (as per ISS)
14
Tolerance, if any (as per ISS)
15
Performance guarantee
GUARANTEED VALUE
Page | 46
UARANTEED TECHNICAL PARTICULARS FOR G.I. WIRE
(TO BE FURNISHED BY BIDDER)
G.I.Wire (4 mm dia)
:
1.
Size of Wire
:
2.
Tolerance in size of wire
:
3.
Tensile strength
:
4.
Wrapping list
:
5.
Galvanising conforming to IS :
4826 – 1968
:
6.
Guarantee
:
B.
G.I.Wire (5 mm dia)
:
1.
Size of Wire
:
2.
Tolerance in size of wire
:
3.
Tensile strength
:
4.
Wrapping list
:
5.
Galvanising conforming to IS :
4826 – 1968
:
6.
Performance guarantee
:
A.
Page | 47
GUARANTEED TECHNICAL PARTICULARS FOR C.I. PIPE (EARTH)
(TO BE FURNISHED BY BIDDER)
G.I.Wire (4 mm dia)
:
1.
Length of Pipe
:
2.
Diameter of Pipe
:
3.
External Dia of Pipe
:
4.
Thickness of Pipe
:
5.
Internal Dia of Socket
:
6.
Thickness of Socket
:
7.
Internal Depth of Socket
:
8.
Internal Radius of Socket
:
9.
Width of Grooves of Socket
:
10.
External Dia of Grooves
Socket
11.
Weight of Pipe
:
12.
Hydraulic Test
:
13.
Guarantee
:
Sl.
Page | 48
GUARANTEED TECHNICAL ARTICULARS FOR 1.1 KV GRADE SINGLE CORE
XLPE INSULATED & PVC SHEATHED HEAVY DUTY ALUMINIUM CONCUCTOR,
UNARMOURED POWER CABLE
Sl.
No.
1
1.
2.
3.
4.
5.
6.
7.
8.
9.
9.1
9.2
9.3
9.4
9.5
10.
10.1
10.2
10.3
10.4
10.5
10.6
10.7
10.8
10.9
10.10
10.11
11.0
11.1
12.
12.1
12.2
12.3
12.4
12.5
Particulars
2
Name & address of manufacturer.
Type and make of cable
Location of factory.
Standard specification to which cable shall conform.
Standard specification to which core shall conform.
Voltage rating.
Permissible variation in voltage, frequency & combined voltage &
frequency.
Standard specification to which drum shall conform.
CONDUCTOR :
Material and its composition.
Shape of conductor.
Total area of conductor.(In Sq. mm)
Stranding details :i)
No. of nominal strands in a core.
ii)
Dia of each strand in a core (before stranding) (in mm)
Maximum D.C Resistance/Core at 20°C (In Ohms/Km.)
INSULATION :
Type of Insulation
Composition of Insulation
Nominal thickness of Insulation (in mm).
Tolerance on thickness of Insulation.
Dia of core over insulation.
Minimum volume resistivity at 27°C (Ohm.Cm.)
Minimum volume resistivity at 70°C (Ohm.Cm.)
Minimum tensile strength of Insulation material.
Minimum Elongation percentage
Average di-electric strength (KV/MM)
Suitability with regard to Moisture, Ozone, Acid, Oil and Alkaline
surroundings.
SHEATHING DETAILS
OUTER SHEATH :
i) Material & composition
ii) Type of sheathing by extrusion ST-1
iii) Thickness of sheathing
(in mm)
iv) Tolerance on thickness of sheathing.
v) Calculated diameter under the sheath (in mm).
vi) Nominal diameter of cable over outer sheath (in mm)
vii) Whether anti termite treatment has been given
in the outer
sheath.
ELECTRICAL PROPERTIES
i) Under continuous full load (in DC)
ii) Under transient conditions ( in DC)
Thermal resistivity of Soil (DC Cm/W)
Thermal Resistivity of XLPE
(DC Cm/W)
Depth of laying (in Cm.) (To the highest point of cable laid direct in
the ground or to the top surface of ducts.
Current ratings of the cable under basic assumptions :
i) Laid in ground (at ground tamp. 30
ii) Laid in duct ( duct temp.30°C)Amp.
iii) Laid in air (air temp. 40°C) Amp.
3
12.6
12.7
12.8
13.0
13.1
13.2
13.3
13.4
13.5
13.6
13.7
13.8
13.9
13.10
Page | 49
Rating factors under various conditions of installation.
Capacitive reactance per Km. of cable at 50 C/S (Ohms per Km.)
Inductive reactance per Km. of Cable at 50 C/S (Ohms per KM)
MECHANICAL DATA :
Approx overall dia of cable (mm)
Minimum bending radius of cable.
Whether identification marking i.e.
i) Property of APDCL
ii) Name of manufacture
iii) Voltage and grade and size
iv) Year of manufacture is being provided at the regular intervals of
two metres of outer most sheath of cable.
v) Whether length of cable at every interval of 1 meter shall be
printed over outer sheath.
Name of manufacturers of bought out raw materials.
i) Aluminium
ii) PVC
iii) Galvanised Steel strip/ wire for armouring
iv) Any other.
a) Whether similar cable has been type tested Yes/No
b) If yes, when and where was it tested.
c) It is expected that you will enclose an electro state copy of type
test report of similar cable. Please inform whether or not you have
entered the same.
d) If yes, how many sheets does it contain. No. of sheets.
e) Only a design better than or equal to what type tested and
proven shall be accepted, please inform whether you will abide by
this condition. Yes/No
Whether wood preservative shall be applied to whole drum?
Whether all ferrous parts shall be treated with rust preventive finish
or coating
Whether waterproof paper layer shall be applied to the surface of
drum & over the outer cable layer.
Reference of license to use-ISI certification mark, if any.
Do you agree to all the provisions of technical specification. In case
of any deviation, state clearly.
Page | 50
3.1. TECHNICAL SPECIFICATIONS FOR ACCESSORIES
AND HARDWARE FITTINGS FOR HT – ABC
Summary:
1.
2.
3.
4.
5.
6.
7.
8.
9.
General conditions
Tee Connections with Surge protection .
Straight Through Joints.
Outdoor End Terminations.
C-wedge boltless connector
Anchoring clamps
Suspension clamps
Eye Hooks.
Pole Clamps.
General Conditions
The products shall be in accordance with Indian standards and most of the European recognised
standards used in HT ABC with any relevant standard.
Marking: Each product shall be clearly identified with Manufacturer name or trade
mark, reference and capacity of the item and batch No.
Packaging: Manufacturer shall mention the packaging of each item. Installation
instruction should be included in the packaging.
Type tests: Each supplier should provide type test reports with the offer, carried
out in accordance with one of the referenced standards in NABL accredited
laboratory.
Routine tests: Suppliers shall provide a control plan, which will be implemented on
each item. Routine Test reports should be submitted by the manufacturer with the
Inspection Call.
Quality: All suppliers should be ISO 9000 certified.
Anchoring and Suspension clamps should be installable on existing poles using
appropriate devices (hooks, Pole clamps etc.)
All crimped connectors should be installed with mechanical or hydraulic hand crimping
tools.
Page | 51
Specification of Tee Connection with Insulated Bus bar & Surge Protection
for 11kv AB Cable
Scope
In the process of drawing HT 11KV AB cable, in between Distribution
Transformers has to be charged by the help of Tee off. While charging
the Distribution Transformer it has to be noted that the main power
cable is not discontinued. In this regard Tee connection with Insulated
Bus bar application with suitable Aluminium Busbars, Insulating Heat
shrinkable bus bar tubings, Polymeric Insulators for Busbar fixing &
Polymeric Surge Arrester for Surge/ Lightning protection are used
properly. The service may be taken from the Tee connector with the
help of AAC bare/ Insulated conductor to the Distribution Transformer.
Technical requisites
Busbars
Insulation:
Insulator:
Suitable Aluminium rectangular Busbars of dimension 1m X 50mm X
6mm with provision for connecting two nos. of Cable end terminations
at both ends & tap off point at the centre of the busbar. The Edges of
the busbars should be free from any sharp edges/ nicks.
The Bus bars should be fully insulated with Heat shrinkable busbar
tubings to prevent any bird fault or accidental contact.
Suitable polymeric pin type insulators should be used for fixing
Busbars on the Pole structure. The housing of the Insulators should
be made up of polymeric materials preferably Track resistant EVA
materials & should conform the following properties:
Mechanical Properties [kN]
Specified Cantilever Load
12.5
Maximum Design Cantilever Load 5.5
Specified Tension Load
25
Routine Test Load
12.5
Electrical Properties [kV]
AC Wet Withstand Voltage 61
AC Dry Withstand Voltage 95
AC Wet Flashover Voltage 72
AC Dry Flashover Voltage 104
Impulse Withstand Voltage 137
Surge
A metal oxide surge arrester with a housing made of polymeric
Protection:
material preferably Silicone rubber, without air voids neither between
the housing and the metal-oxide resistors nor the housing itself.
Arresters must have directly moulded housings. The arresters should
be tested as per IEC 60099-4 & conform to the following criteria:
Rated Voltage : 9KV
Nominal Discharge Current : 5KA
Distribution Class
Creepage length : >300mm.
Impulse Voltage 1.2/ 50µsec : 95KV
Power frequency withstand voltage : 38KV
Voltage Ratings: Nominal system voltage (kV) : 6.6KV(UE)/11KV (E) (phase to phase)
Maximum system voltage (kV): 6.6KV(UE)/11KV (E) (phase to phase)
Maximum performance : For 11KV (E)
QUALITY ASSURANCE
Page | 52
The manufacturer shall be certified in accordance with ISO 9001. The supplier has to
provide a copy of a valid certificate along with his quote.
Relevant Manuals or Drawings shall be presented upon request to customer/utility.
PACKING AND SHIPMENT
Tee Jointing Kits shall be securely packed, complete with all accessories, in strong nonreturnable boxes, in such a manner as to prevent damage during shipment.
Specification of Straight Through Joint for 11kv AB Cable
Scope
Technical
requisites
Conductor
Connection:
Void filling &
Stress Control:
Insulation Build
up & Insulation
screen:
Screen
Continuity:
Environmental
sealing
Voltage Ratings:
In the process of drawing HT 11Kv AB cable, at the end of one
drum of cable, to continue the drawing of the cable the cable from
other drum has to be joined by Midspan Inline Straight through
joints. In this regard, Straight through joint should be supplied with
suitable Mechanical Connector, proper Stress Control, adequate
Insulation, suitable screen continuity & sufficient environmental
sealing should be achieved.
Suitable Shear bolt type Al. Mechanical Connector has to be used.
Suitable void filling Mastic & Heat shrinkable Stress control tube.
By Heat shrinkable dual wall tube with extruded Insulation &
semiconducting layers.
With the help of Copper wire mesh..
Outer sealing should be with the help of Heat Shrinkable outer tube
& with Proper sealing mastics.
Nominal system voltage (kV) : 6.6KV(UE)/11KV (E) (phase to phase)
Maximum system voltage (kV): 6.6KV(UE)/11KV (E) (phase to
phase)
Maximum performance : For 11KV (E)
testing Standards: The Straight Through Joint should conform/ withstood the following
test std.Tests
Recommended Test values
AC High voltage
Load cycling 900C + 50C (no.
of cycles)
Load cycling 900C + 50C (no.
of cycles) under 0.25 mtr. of
water
Impulse voltage
Partial discharge voltage
Thermal short circuit
DC voltage
QUALITY ASSURANCE
28.5KV (rms)
18 Cycles
12 Cycles
95KV (peak)
At 12.75KV < 5 pc
For 1 sec. KA will depend on
conductor size.
38KV for 15 mins.
Page | 53
The manufacturer shall be certified in accordance with ISO 9001. The supplier has to
provide a copy of a valid certificate along with his quote.
Relevant Manuals or Drawings shall be presented upon request to customer/utility.
PACKING AND SHIPMENT
Straight through Jointing Kits shall be securely packed, complete with all accessories, in
strong non-returnable boxes, in such a manner as to prevent damage during shipment.
Specification of Outdoor End Termination for 11kv AB Cable
Scope
Technical requisites
Conductor
Connection:
Void filling
Stress Control,
Environmental
Sealing & Anti
tracking
Earthing
Connection
Continuity:
Voltage Ratings:
testing Standards:
In the process of drawing HT 11Kv AB cable, at the end of the
cabling system the cable has to be connected with the Transformer
end or with the bare overhead line by Outdoor end terminations. In
this regard, Outdoor end terminations should be supplied with
suitable Crimping type lugs, proper Stress Control, adequate
Insulation & sufficient environmental sealing should be achieved.
In the process of drawing HT 11Kv AB cable, at the end of the
cabling system the cable has to be connected with the Transformer
end or with the bare overhead line by Outdoor end terminations. In
this regard, Outdoor end terminations should be supplied with
suitable Crimping type lugs, proper Stress Control, adequate
Insulation & sufficient environmental sealing should be achieved.
Suitable Crimping type Al. lugs has to be used.
Suitable void filling Mastic.
By Heat shrinkable dual wall single tube has to be used for both
stress controlling & Environmental sealing purpose. Minimum
(one) no. of Heat shrinkable Rain shed can be used for increasing
Creepage distance.
With the help of Tinned Copper braid.
Nominal system voltage (kV) : 6.6KV(UE)/11KV (E) (phase to
phase)
Maximum system voltage (kV): 6.6KV(UE)/11KV (E) (phase to
phase)
Maximum performance : For 11KV (E)
The Outdoor End Termination should conform/ withstood the
following test std.Tests
Recommended Test values
AC High voltage
Load cycling 900C + 50C (no.
of cycles)
Load cycling 900C + 50C (no.
of cycles) under 0.25 mtr. of
water
Impulse voltage
28.5KV (rms)
18 Cycles
12 Cycles
95KV (peak)
Page | 54
Partial discharge voltage
Thermal short circuit
DC voltage
At 12.75KV < 5 pc
For 1 sec. KA will depend on
conductor size.
38KV for 15 mins.
QUALITY ASSURANCE
The manufacturer shall be certified in accordance with ISO 9001. The supplier has to
provide a copy of a valid certificate along with his quote.
Relevant Manuals or Drawings shall be presented upon request to customer/utility.
PACKING AND SHIPMENT
Outdoor End Termination Kits shall be securely packed, complete with all accessories, in
strong non-returnable boxes, in such a manner as to prevent damage during shipment.
Specification of C Wedge Boltless connectors
Scope
The C-Type fired wedge boltless connectors shall be of high
strength and high
conductivity Aluminium alloy. The same shall be suitable for use on
all combinations of
Aluminium to Aluminium, or Aluminium to Copper conductors. The
components shall be properly proportioned to minimize stress
concentration, corrosion and deterioration by galvanic action &
should be used for taking tap off in AB Cable from Bare overhead
line. Bolted connectors should be avoided.
The C-Type fired wedge boltless connectors shall be of high
strength and high
conductivity Aluminium alloy. The same shall be suitable for use on
all combinations of
Aluminium to Aluminium, or Aluminium to Copper conductors. The
components shall be properly proportioned to minimize stress
concentration, corrosion and deterioration by galvanic action &
should be used for taking tap off in AB Cable from Bare overhead
line. Bolted connectors should be avoided.
Technical requisites “C” TYPE FIRED WEDGE BOLT LESS CONNECTOR:
The connector consists of tapered “C” shaped member and wedge
that made of Aluminium alloy.
The connector should be bolt less and Fired wedge system.
The “C” member should be provided built-in spring tension to
maintain constant pressure for a firm electrical contact.
The connector shall be used for multiple combinations of
solid/stranded AAC, AAAC, ACSR, copper combination etc.
Copper to Copper connectors the “C” member is composed of
Aluminum Bronze alloy and the wedge of Copper alloy very close
to pure copper.
“C” member wedge shall be factory coated with an inhibitor
containing abrasive particles to help clean and contact surfaces
during installation.
The C-Type fired wedge boltless connectors shall conform to the
latest editions of ANSI C 119.4 - 2004 Standards.
The wedge type boltless connectors shall consists of C-Member
and wedge. The wedge shall be inserted at a speed of 40 m./Sec
Page | 55
approx so as to be effective in abrading all sliding surface and
disrupting surface oxide film to generate large number of contact
spot in the electrical interfaces. The mechanical stresses during the
wedge insertion shall cause elastic deformation of the C-Clamp
and shall increase the geometrical conformation of the clamp to the
conductor. An Oxidation inhibitor shall be applied to the surface
thereby elimination of oxidation of metallic surface. The normal
current carrying capacity of clamp shall not be less than the
specified in the specification. If the connectors are to be installed
by Powder actuated tool using cartridges with explosive, valid
explosive license issued by the Government of India/State
Government should be possessed.
Clamps shall be corona free and shall carry an overload of at least
20% over the rated current. The connectors should be easily
removable and reusable type. Reusable means that the connector
may be removed from service and installed again. Prior to reuse,
any instructions to be followed for reconditioning the reusable
connector shall be furnished.
QUALITY ASSURANCE
The manufacturer shall be certified in accordance with ISO 9001. The supplier has to
provide a copy of a valid certificate along with his quote.
Relevant Manuals or Drawings shall be presented upon request to customer/utility.
PACKING AND SHIPMENT
Outdoor End Termination Kits shall be securely packed, complete with all accessories, in
strong non-returnable boxes, in such a manner as to prevent damage during shipment.
Anchoring Clamp for Bare messenger
The clamps should be designed to anchor HT-AB Cable with Bare neutral
messenger. The clamp should consists of an Aluminium alloy corrosion
resistant casted body and 3 U bolts which shall anchor/hold the neutral
messenger without damaging the conductor strands.
The clamp should be installed properly.
No losable part in the process of clamping arrangement.
The clamp should conform to the standard IS 2629 & 2633.
The clamp body should be made of Galvanised Steel to the standard IS
2629 & 2633 & wedges should be made of corrosion resistant Aluminium
alloy as per IS 617- 1975.
Clamps should be fixed with pole by Eye hooks.
Ultimate Tensile Strength of the clamp should not be less than 20 KN.
Maximum Allowable load of the clamp should not be less than 20 KN.
Design as per furnished drawing.
Suspension clamp for Bare neutral messenger:
Page | 56
The clamps should be designed to hang HT-AB Cables with bare neutral messengers.
The neutral messengers should be fixed by an adjustable grip device with 2 U bolts.
The clamp should be installed properly.
No losable part in the process of clamping arrangement.
The clamp should conform to the standard IS 2629 & 2633 & REC Constr.
Standard E-34.
The clamp body should be made of Galvanised Steel to the standard IS 2629
& 2633 & wedges should be made of corrosion resistant Aluminium alloy as
per IS 617- 1975.
Clamps should be fixed with pole by Eye hook.
Ultimate Tensile Strength of the clamp should not be less than 20 KN.
Maximum Allowable load of the clamp should not be less than 20 KN.
The clamp should sustain to maximum angle of deviation of 60 degrees of the
conductors.
Design as per furnished drawing.
Eye Hooks:
Eye hooks should be designed as to hold Suspension Clamps and Dead end Clamps on
the poles:Eye hooks should be made of forged Galvanised Steel.




The clamps should be corrosion resistance & should confirm to the standard IS: 2629 and
IS: 2633
Bolt and nuts should be made of hot dip galvanised steel, according to VDE 0210 and
VDE 0212.
Ultimate Tensile Strength (UTS) of the clamp should be 15 KN.
Design as per furnished drawing.
Pole Clamps:
Pole Clamps should be designed as to hold Eye hooks by two nut bolts on the poles:Pole Clamps should be made of forged Galvanised Steel.




The clamps should be corrosion resistance & should confirm to the standard IS: 2629
and IS: 2633
Bolt and nuts should be made of hot dip galvanised steel, according to VDE 0210 and
VDE 0212.
It can be fabricated from 50 x 6 mm GI flat.
Design as per furnished drawing.
Technical Data schedule:
Page | 57
A. GUARANTEED TECHNICAL PARTICULARS FOR SUSPENSION CLAMP FOR
BARE MESSENGER WIRE
Sl.No
Description
1.
Name & address of the
Manufacturer
Applicable standard
Type of Clamp
Type of design
Voltage Grade (kV)
Loop anchor attachment
(open/close)
Installation (with/without disassembly)
Type & grade (metallic / nonmetallic material)
Type of hot dip galvanizing &
thickness of Zinc coating
Marking
Colour of non-metallic parts
Dimensions
Approximate weight
Ultimate tensile strength (KN)
Maximum allowable load (KN)
Max. angle of deviation of
conductor (degrees)
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
Guaranteed particulars
Authorised Signatory
B. GUARANTEED TECHNICAL PARTICULARS FOR DEAD END
CLAMP FOR BARE MESSENGER WIRE
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Name & address of the
Manufacturer
Applicable standard
Type of Clamp
Type of design
Voltage Grade (Kv)
Loop anchor attachment
(open/close)
Installation (with/without disassembly)
Type & grade (metallic / nonmetallic material)
Type of hot dip galvanizing &
thickness of Zinc coating
Marking
Colour of non-metallic parts
Dimensions
Approximate weight
Ultimate tensile strength (KN)
Maximum allowable load (KN)
Authorised Signatory
Page | 58
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
C. GUARANTEED TECHNICAL PARTICULARS FOR END
TERMINATION KIT
Name & address of the Manufacturer
Applicable standard
Type of Cable jointing kit
Application
Nominal system voltage (kV)
Maximum system voltage (kV)
Number of main core
Number of branch conductor
Whether single tube is used for Stress
control & anti-tracking
Type of insulation
Type of screening
System neutral earthing
Maximum performance
AC voltage
Load cycling 900C + 50C (no. of cycles)
Load cycling 900C + 50C (no. of cycles)
under 0.25 mtr. of water
Impulse voltage
Partial discharge voltage
Thermal short circuit
DC voltage
Dynamic short circuit
Authorised Signatory
D. GUARANTEED TECHNICAL PARTICULARS FOR STRAIGHT JOINT FOR
HT 11KV (E)
1.
Name & address of the
Manufacturer
2.
Applicable standard
3.
Type of Cable jointing kit
4.
Application
5.
Nominal system voltage (kV)
6.
Maximum system voltage (kV)
7.
Number of cores
8.
Type of insulation
9.
Type of screening
10.
System Neutral Earthing
11.
Maximum performance
12.
AC voltage
13.
Load cycling 900C + 50C (no. of
cycles)
14.
Load cycling 900C + 50C (no. of
cycles) under 0.25 mtr. of water
15.
Impulse voltage
16.
Partial discharge voltage
17.
Thermal short circuit
18.
DC voltage
19.
Dynamic short circuit
Page | 59
Authorised Signatory
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
22.
23.
24.
25.
26.
E. GUARANTEED TECHNICAL PARTICULARS FOR TEE CONNECTION
WITHSURGEPROTECTION
Name & address of the
Manufacturer
Applicable standard
Application
Nominal system voltage (kV)
Maximum system voltage (kV)
Number of main core
Number of branch conductor
Type of Busbar
Type of insulation
Type of Insulators
Cantilever Load of Insulator
Max. Design Cantilever load of
Insulator
Creepage Length of Insulator
Specified Tension Load of Insulator
AC Wet withstand voltage of
Insulator
AC Dry withstand voltage of
Insulator
AC Wet Flashover voltage of
Insulator
AC Dry Flashover voltage of
Insulator
Impulse withstand voltage of
Insulator
Type of Surge arresters
Rated voltage of SA
Nominal Discharge Current of SA
Distribution Class of SA
Creepage Length of SA
Impulse Voltage of SA
Power frequency withstand Voltage
of SA
Authorised Signatory
1.
2.
3.
4.
5.
6.
7.
F. GUARANTEED TECHNICAL PARTICULARS FOR EYE HOOK
Name & address of the
Manufacturer
Applicable standard
Type of Clamp
Type of design
Type & grade (metallic / nonmetallic material)
Type of hot dip galvanizing &
thickness of Zinc coating
Marking
Page | 60
8.
9.
10.
11.
Colour of non-metallic parts
Dimensions
Approximate weight
Ultimate tensile strength (KN)
Authorised Signatory
G. GUARANTEED TECHNICAL PARTICULARS FOR C FIRE WEDGE CLAMP
No
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Feature/Technical Details
Manufacturer‟s Name
Manufacturer‟s Location
Brand Name
Part Number
Application
Installation and Application Tooling
Connector Removal
Installation on Energized Lines
Conductor Size
Connector, Metallic Material
Connector, Non-Metallic Material
Voltage/Ampacity
Operating Temperature
Marking
Industry Standards
Overall Size
Authorised Signatory
3.2. TECHNICAL SPECIFICATION FOR 33KV & 11 KV ISOLATORS
1.0
1.1.
1.2.
1.3.
2.0
2.1.
2.2.
2.3.
SCOPE
This section of the specification is intended to cover design specifications for
manufacture and testing of 33 KV and 11 KV gang operated switch (Isolators)
with all fittings and accessories.
The Isolators are for outdoor installation suitable for horizontal/vertical mounting
on mounting structures and for use at sub-stations.
Isolators shall be supplied with Earth Switch as and where specified.
GENERAL
The Isolators and accessories shall conform in general to IS 9921 (or IEC: 62271102) except to the extent explicitly modified in specification.
All isolating switches and earthing switches shall have rotating blades and
pressure releasing contacts. All isolating and earth switches shall operate through
90 angle from closed position to fully open position.
Complete isolator with all the necessary items for successful operation shall be
supplied including but not limited to the following:
(i). Isolator assembled with complete base frame, linkages, operating mechanism,
control cabinet, interlocks etc.
(ii). All necessary parts to provide a complete and operable isolator installation,
control parts and other devices whether specifically called for herein or not.
(iii). The isolator shall be designed for use in the geographic and meteorological
conditions as given in Section 1.
Page | 61
3.0
3.1.
3.2.
3.3.
3.4.
3.5.
3.6.
DUTY REQUIREMENTS
Isolators and earth switches shall be capable of withstanding the dynamic and
thermal effects of the maximum possible short circuit current of the systems in
their closed position. They shall be constructed such that they do not open under
influence of short circuit current.
The earth switches, wherever provided, shall be constructionally interlocked so
that the earth switches can be operated only when the isolator is open and vice
versa. The constructional interlocks shall be built in construction of isolator and
shall be in addition to the electrical and mechanical interlocks provided in the
operating mechanism.
In addition to the constructional interlock, isolator and earth switches shall have
provision to prevent their electrical and manual operation unless the associated
and other interlocking conditions are met. All these interlocks shall be of failsafe
type. Suitable individual interlocking coil arrangements shall be provided. The
interlocking coil shall be suitable for continuous operation from DC supply and
within a variation range as stipulated elsewhere in this specification.
The earthing switches shall be capable of discharging trapped charges of the
associated lines.
The isolator shall be capable of making/breaking normal currents when no
significant change in voltage occurs across the terminals of each pole of isolator
on account of make/break operation.
The isolator shall be capable of making/breaking magnetising current of 0.7A at
0.15 power factor and capacitive current of 0.7A at 0.15 power factor at rated
voltage.
CONSTRUCTIONAL DETAILS
All isolating switches and earthing switches shall have rotating blades and
pressure releasing contacts. All isolating and earth switches shall operate through
90 angle from closed position to fully open position.
3.8.
Contacts:
The contacts shall be self-aligning and self-cleaning and so designed that binding cannot
occur after remaining closed for prolonged periods of time in a heavily polluted
3.7.
3.9.
a) No undue wear or scuffing shall be evident during the mechanical endurance
tests. Contacts and spring shall be designed so that readjustments in contact
pressure shall not be necessary throughout the life of the isolator or earthing
switch. Each contact or pair of contacts shall be independently sprung so that
full pressure is maintained on all contacts at all time.
b) Contact springs shall not carry any current and shall not lose their
characteristics due to heating effects.
c) The moving contact of double break isolator shall have turn-and -twist type or
other suitable type of locking arrangement to ensure adequate contact
pressure.
Blades:
a) All metal parts shall be of non-rusting and non-corroding material. All current
carrying parts shall be made from high conductivity electrolytic
copper/aluminium. Bolts, screws and pins shall be provided with lock washers.
Keys or equivalent locking facilities if provided on current carrying parts, shall
be made of copper silicon alloy or stainless steel or equivalent. The bolts or
Page | 62
pins used in current carrying parts shall be made of non-corroding material. All
ferrous castings except current carrying parts shall be made of malleable cast
iron or cast-steel. No grey iron shall be used in the manufacture of any part of
the isolator.
b) The live parts shall be designed to eliminate sharp joints, edges and other
corona producing surfaces, where this is impracticable adequate corona shield
shall be provided..
c) Isolators and earthing switches including their operating parts shall be such
that they cannot be dislodged from their open or closed positions by short
circuit forces, gravity, wind pressure, vibrations, shocks, or accidental touching
of the connecting rods of the operating mechanism.
d) The switch shall be designed such that no lubrication of any part is required
except at very infrequent intervals i.e. after every 1000 operations or after 5
years whichever is earlier.
3.10. Insulators:
a) The insulator shall conform to IS: 2544 and/or IEC-60168. The insulators shall
have a minimum cantilever strength of 400 Kgs. for 33/11 kV insulators
respectively.
b) Pressure due to the contact shall not be transferred to the insulators after the
main blades are fully closed.
3.11. Base:
Each isolator shall be provided with a complete galvanised steel base provided
with holes and designed for mounting on a supporting structure.
4.0
EARTHING SWITCHES
4.1.
Where earthing switches are specified these shall include the complete operating
mechanism and auxiliary contacts.
4.2.
The earthing switches shall form an integral part of the isolator and shall be
mounted on the base frame of the isolator.
4.3.
The earthing switches shall be constructionally interlocked with the isolator so that
the earthing switches can be operated only when the isolator is open and vice
versa. The constructional interlocks shall be built in construction of isolator and
shall be in addition to the electrical interlocks.
Suitable mechanical arrangement shall be provided for de-linking electrical drive
for mechanical operation.
4.4.
Each earth switch shall be provided with flexible copper/aluminum braids for
connection to earth terminal. These braids shall have the same short time current
carrying capacity as the earth blade. The transfer of fault current through swivel
connection will not be accepted.
4.5.
The frame of each isolator and earthing switches shall be provided with two
reliable earth terminals for connection to the earth mat.
4.6.
Isolator design shall be such as to permit addition of earth switches at a future
date. It should be possible to interchange position of earth switch to either side.
4.7.
The earth switch should be able to carry the same fault current as the main blades
of the Isolators and shall withstand dynamic stresses.
5.0
5.1.
5.2.
5.3.
OPERATING MECHANISM
The bidder shall offer manual operated Isolators and earth switches..
Control cabinet/operating mechanism box shall be made of aluminum sheet of
adequate thickness (minimum 3 mm).
Gear should be of forged material suitably chosen to avoid bending/jamming on
operation after a prolonged period of non-operation. Also all gear and connected
material should be so chosen/surface treated to avoid rusting.
Page | 63
OPERATION
The main Isolator and earth switches shall be gang operated.
The design shall be such as to provide maximum reliability under all service
conditions. All operating linkages carrying mechanical loads shall be designed for
negligible deflection. The length of inter insulator and interpole operating rods shall
be capable of adjustments, by means of screw thread which can be locked with a
lock nut after an adjustment has been made. The isolator and earth switches shall
be provided with “over center” device in the operating mechanism to prevent
accidental opening by wind, vibration, short circuit forces or movement of the
support structures.
6.3.
Each isolator and earth switch shall be provided with a manual operating handle
enabling one man to open or close the isolator with ease in one movement while
standing at ground level. Detachable type manual operating handle shall be
provided. Suitable provision shall be made inside the operating mechanism box for
parking the detached handles. The provision of manual operation shall be located
at a height of 1000 mm from the base of isolator support structure.
6.4.
The isolator shall be provided with positive continuous control throughout the
entire cycle of operation. The operating pipes and rods shall be sufficiently rigid to
maintain positive control under the most adverse conditions and when operated in
tension or compression for isolator closing. They shall also be capable of
withstanding all torsional and bending stresses due to operation of the isolator.
Wherever supported the operating rods shall be provided with bearings on either
ends. The operating rods/ pipes shall be provided with suitable universal couplings
to account for any angular misalignment.
6.5.
All rotating parts shall be provided with grease packed roller or ball bearings in
sealed housings designed to prevent the ingress of moisture, dirt or other foreign
matter. Bearings pressure shall be kept low to ensure long life and ease of
operation. Locking pins wherever used shall be rustproof.
6.6.
Signaling of closed position shall not take place unless it is certain that the
movable contacts, have reached a position in which rated normal current, peak
withstand current and short time withstand current can be carried safely. Signaling
of open position shall not take place unless movable contacts have reached a
position such that clearance between contacts is atleast 80% of the isolating
distance.
6.7.
The position of movable contact system (main blades) of each of the Isolators and
earthing switches shall be indicated by a mechanical indicator at the lower end of
the vertical rod of shaft for the Isolators and earthing switch. The indicator shall be
of metal and shall be visible from operating level.
6.8.
The contractor shall furnish the following details along with quality norms, during
detailed engineering stage.
(i) Current transfer arrangement from main blades of isolator along with millivolt
drop immediately across transfer point.
(ii) Details to demonstrate smooth transfer of rotary motion from motor shaft to the
insulator along with stoppers to prevent over travel.
7.0 TEST AND INSPECTION
7.1.
The switches shall be subjected to the following type test in accordance to with IS:
9920.
I)
Dielectric test (impulse and one minute) power frequency withstands
voltage.
II) Temperature rise test
III) Rated off load breaking current capacity
IV) Rated active load breaking capacity
6.0
6.1.
6.2.
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V) Rated line charging breaking capacity
VI) Rated short time current
VII) Rated peak withstand current
7.2.
7.3.
VIII) Mechanical and Electrical Endurance
The equipment shall be subjected to the following routine test.
I)
Power frequency voltage dry test
II) Measurement of resistance of the main circuit
III) Operating test.
The porcelain will have pull out test for embedded component and beam strength
of porcelain base.
8.0 CONNECTORS
8.1.
Each isolator shall be provided with appropriate number of bimetallic clamping
type connectors as detailed in the schedule of requirement. The maximum length
of jumper that may be safely connected or any special instruction considered
necessary to avoid under loads on the post isolators should be stated by the
tenderer.
9.0 SUPPORTING STRUCTURES
9.1.
All isolators and earthing switches shall be rigidly mounted in an upright position
on their own supporting structures. Details of the supporting structures shall be
furnished by the successful tenderer. The isolators should have requisite fixing
details ready for mounting them on switch structures.
10.0 PRE-COMMISSIONING TESTS
10.1. Contractor shall carry out following tests as pre-commissioning tests. Contractor
shall also perform any additional test based on specialties of the items as per the
field instructions of the equipment Supplier or Employer without any extra cost to
the Employer. The Contractor shall arrange all instruments required for conducting
these tests along with calibration certificates and shall furnish the list of
instruments to the Employer for approval.
(a) Insulation resistance of each pole.
(b) Manual operation and interlocks.
(c) Insulation resistance of control circuits and motors.
(d) Ground connections.
(e) Contact resistance.
(f) Proper alignment so as to minimise to the extreme possible the vibration
during operation.
(g) Measurement of operating Torque for isolator and Earth switch.
(h) Resistance of operating and interlocks coils.
(i) Functional check of the control schematic and electrical & mechanical
interlocks.
(j) 50 operations test on isolator and earth switch.
11.0
TECHNICAL DATA SHEET FOR ISOLATORS
SL
Technical Particulars
Isolators class
No.
33 kV
11kV
1
Nominal system voltage, kV
33
11
2
Highest system voltage, kV
36
12
3
Rated frequency, Hz.
50
50
4.
Type of Isolator
Double Break,
Double Break,
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SL
No.
Technical Particulars
5
6
Rated continuous current, A
Rated short time current, kA
for 3sec
Rated duration of short time
current, Second
Rated lightning impulse
withstand voltage, kV (peak)
i) To earth & between poles
ii) Across isolating distance
Rated 1 minute power
frequency withstand voltage,
kV (rms)
i) To earth & between poles
ii) Across isolating distance
Rated 1 minute power
frequency withstand voltage,
kV (rms)
i) To earth & between poles
ii) Across isolating distance
Minimum creepage distance
of insulators, mm
Temperature rise
7
8
9
9
10
11
Isolators class
33 kV
11kV
center pole
center pole
rotating
rotating
630
630/400 A
25
16
3
3
170
170
95
95
70
80
28
40
70
80
28
40
900
400
As per relevant IS
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