ASSAM POWER DISTRIBUTION COMPANY LTD.

BID DOCUMENT FOR

SUPPLY OF DIFFERENT 33 KV AND 11 KV SUBSTATION EQUIPMENTS

SCHEME: “ANNUAL PLAN 2012-13” NIT NO.CGM (PP&D)/ APDCL/AP-12-13/SS/EQUIPMENTS/01 Dated 21. 08.13

2

INDEX

Section – 1 Notice Inviting Tender

Section – 2 Tender Inviting Proposal

Section – 3 Schedule of Items to be Procured

Section – 4 Qualifying Requirement of the Bidder

Section – 5 Bid Proposal Sheet

Section – 6 Schedule of Price

Section – 7 Technical Specifications.

Section – 8 Guaranteed Technical Particulars

Section ---9 Forms of Bid

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SECTION -1 NOTICE INVITING TENDER

4

ASSAM POWER DISTRIBUTION CO. LTD. Bijulee Bhawan, Paltanbazar, Guwahati-781001

NIT NO.CGM (PP&D)/ APDCL/AP-12-13/SS/EQUIPMENTS/01 dtd.21.08.2013

The Chief General Manager (PP&D), APDCL, Bijulee Bhawan, Paltanbazar, Guwahati-1,

invites sealed tenders from reputed manufacturers or their authorised dealers for design,

manufacture and testing, supply and delivery of 33 & 11 kV VCB, Autorecloser, Isolator, CT,

PT, 11 kV 9 unit VCB Panel, Battery Bank & Battery Charger at APDCL store under Annual

Plan 2012-13. The intending bidders must quote for all the items as above.

The tender paper / bid documents can be obtained from the office of the undersigned on

payment of ₹ 12,000.00 (Rupees Twelve thousand) only in the form of Bank Draft /

Banker’s cheque pledged in favour of “ASSAM POWER DISTRIBUTION CO.

LTD.GUWAHATI-1” on any working days w.e.f 22.08.13 to 19.09.2013. Alternatively, the

Bid document can be downloaded from the APDCL’s website: www.apdcl.gov.in . The

Bidders using downloaded document will attach an A/C Payee Demand Draft /Banker’s

cheque (non refundable) of ₹ 12,000.00 (Rupees Twelve thousand) only duly pledged in

favour of “ ASSAM POWER DISTRIBUTION CO. LTD.GUWAHATI-1”

Details may be seen in the website www.apdcl.gov.in

Chief General Manager (PP&D), APDCL.Bijulee Bhawan, Guwahati-1

Memo No. CGM (PP&D)/ APDCL/T-22/2012-Extension/AP-12-13//EQP/ dtd 21.08.13 Copy to :-

1. The CGM (D), LAR /CAR/UAR, APDCL -----for favour of kind information.

2. PS to the CMD, APDCL for kind appraisal of CMD

3. The PRO, ASEB, he is requested to publish the above mentioned notice in one issue

of “The Assam Tribune and one National daily news paper.

Chief General Manager (PP&D), APDCL. Bijulee Bhawan, Guwahati-1

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ASSAM POWER DISTRIBUTION CO. LTD

PROJECT PLANNING & DESIGN

NIT NO.CGM (PP&D)/ APDCL/AP-12-13/SS/EQUIPMENTS/01 dtd.21.08.2013

Sealed Tenders are invited from manufacturer or their authorized dealer for design, manufacture and supply of different 33 KV & 11 KV Substation Equipments as mentioned in section -3 of this Bid document under Annual Plan 2012-13.

Cost of Tender Paper : ₹ 12,000/-(Rupees Twelve thousand) only 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 papers can be purchased on all working days up to 5 PM w.e.f. 22.08.2013 to 19.09.2013 from the office of the Chief General Manager (PP&D), APDCL, Bijulee Bhawan, 6TH Floor, Guwahati-1.

1. Source of Fund: Annual Plan 2012-13

2. Date of submission of Tenders: Up to 13-00 Hrs. of 20.09.2013

3. Date of pre-bid discussion : 13:00 Hrs of 12.09.13

4. Date of opening of Bid: Techno commercial bids will be opened on 20.09.2013 at 13-30 Hrs and the price bid on a

date to be notified later on.

5. Average Annual Turnover Rs. 5.00 Cr. (for the last three years)

6. Earnest Money Deposit (EMD) Rs. 15.00 Lakh (Rs.7.5 Lakh for SC/ST)

7. Delivery period: 180 (one hundred eighty) days from the date of approval of GTP and drawing. GTP and drawing

should be submitted within 45 days from the date of issue of work order.

8. Destination: To any or all the central Stores located at

Guwahati, Jorhat, Tezpur, Silchar town.

9. Terms and condition :

i) A list of approved manufacturer of different equipments to be procured is

enclosed in Section -8 of this bid document. Equipments of approved

manufacturer as per the list will only be procured .

ii) The Techno-Commercial & Price bids must be submitted in two separate sealed

cover superscribing the following on both the covers.

a) Name of bidder with full address

b) Tender Notice No

c) “ Techno-Commercial bid with earnest money” for envelope

containing Techno-commercial Bid and “ Price bid” for envelope

containing the price bid.

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iii) Earnest money as stipulated should be submitted with the Techno Commercial

bid in the shape of Bank Call Deposit/NSC/Term Deposit/ Bank Guarantee of

nationalised bank pledged in favour of “ASSAM POWER DISTRIBUTION

COMPANY LIMITED, Guwahati-1”. Any tender without earnest money will be

rejected outright.

iv) Price bids shall consist of price bidding schedule with quantity and prices filled up

alongwith relevant taxes and duties as applicable

v) Rates should be quoted both in figures and words legibly and no overwriting will

be accepted

vi) The Company will not be responsible for any cost or expenses incurred on the

preparation or delivery of the bids.

vii) Quoted rate must be valid for a minimum of 120 days.

viii) The tender should be submitted in the office of the Chief General Manager

(PP&D), APDCL, Bijulee Bhawan, 6th floor, Paltanbazar, Guwahati-1 and will be

opened on the scheduled date & time in presence of the intending bidders.

ix) The Company reserves the right to accept or reject any tender in part or in full or

cancel/withdraw the Notice inviting tender without assigning any reason thereof

whatsoever and in such case, no bidder/intending bidder shall have any claim

arising out of such action.

x) The Company is not bound to accept the lowest quoted rate.

xi) The Company reserves the right to split the quantity to be ordered amongst

technically qualified bidders.

xii) The Company reserves the right to reduce the quantity or order them in full or

part thereof in phased manner and also may modify slightly the delivery

destination of the Equipments at any time.

xiii) The bidding documents are not transferable and cost of bidding document is not

refundable under any circumstances.

xiv) The authorized dealers of the approved manufacturer as per list in Section-8

must submit their recent dealership certificate.

xv) As the supplied items must be guaranteed for a period of 18 months/60 months,

the dealers participating in the bid must submit manufacturer’s authorization

certificate in their letter head for the guarantee period as per format in Section-9.

Chief General Manager (PP&D),

APDCL, 6th floor, Bijulee Bhawan. Paltan bazaar, Guwahati-1

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SECTION 2

TENDER INVITING PROPOSAL

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ASSAM POWER DISTRIBUTION CO. LTD PROJECT, PLANNING & DESIGN

2. TENDER INVITING PROPOSALS WITH ADDITIONAL TERMS & CONDITIONS 2.1 Intent of the Tender Enquiry: The intent of the Tender Enquiry is to invite proposals from

the Manufacturer or their authorized dealers for design, manufacture and testing, supply and delivery of 33 & 11 KV VCB, Autorecloser, Isolator, CT, PT, 11 KV 9 unit VCB Panel, Battery Bank & Battery Charger at APDCL store.

2.2 Scope of Work: The scope of work involves design, engineering, manufacture, assembly,

inspection, pre-despatch testing at manufacturer’s works, packing, supply and delivery at

destination including insurance during transit to store under APDCL

2.3 Basic specification of the equipment to be supplied

Equipment to be supplied shall provide easy and effective:

Maintainability

Reliability

Availability

Long life

2.4 Submission of bid: The bidder can submit their bid in a sealed envelope as follows: 2.4.1. Techno-commercial bid: Techno-commercial bid should be submitted in a envelope Superscribing “Techno-commercial bid” with name of bidder with full address, NIT reference etc. and under this, the Bidder should submit

a) Earnest money deposit

b) Technical details along with type test certificate from Govt. approved

test house.

c) Drawings.

d) Validity of offer

e) Terms of payment

f) Delivery schedule

g) Annual turnover

h) Order executing details

i) User’s performance Report

j) Tender proforma for techno-commercial Bid is enclosed as Annexure-I.

2.4.2 Earnest Money Deposit (EMD): The Tender must be accompanied with earnest money of

Rs. 15.00 Lakh (Rs. 7.5 Lakh for SC/ST) and it is to be deposited in the shape of Bank

Call Deposit/Term Deposit/ BG of nationalized bank or scheduled bank of RBI having their

regional offices in Assam or at least a branch office at Guwahati ( In case of those, whose

regional office is not located in the state of Assam) with a certificate from the Bank to the

effect that the verification or any confirmation in regard to the BG issued by the bank can

be taken up with the Branch office at Guwahati pledged in favour of “ASSAM POWER

DISTRIBUTION COMPANY LIMITED. Guwahati-1”.The EMD should be valid for

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6(six) months from the date of submission of tender. The EMD should be submitted

alongwith Techno- Commercial bid. The earnest money of the unsuccessful bidders will be

released on finalization of the tenders. The EMD to the successful bidder will be released

on submission of Security Deposit to APDCL as per clause no. 2.12 of the bid document.

EMD of successful bidder is liable to be forfeited on non-submission of security deposit

within the stipulated period mentioned in clause 2.12

2.4.3 Price Bid

a) The price bid should be submitted in a separate envelope Superscripting “Price Bid” with name of bidder with full address, NIT reference, etc.

b) The price bid should distinctly indicate the following components –quoted price with clear differentiation of Ex-factory price, Freight & Insurance, Taxes and Duties.

2.4.4. The “Techno-commercial Bid” and “Price Bid” are to be submitted as mentioned above ( i.e separately under two separate sealed envelopes) and both the envelopes should

be placed in a bigger envelope superscribing name of bidder with full address, NIT reference etc. and addressed to Chief General Manager(PP&D), APDCL, Bijulee Bhawan, 6th Floor, Paltanbazar, Guwahati-781001.

2.4.5 Bidders should furnish order execution details of items of similar specification for a

minimum of last three years.

2.4.6 Each and every paper of the tender bid should be signed affixing seal by the bidder

while submitting tender/bid.

2.4.7 The Contractor shall furnish copies of test certificates of materials used for manufacture

and also the test certificates of the tests conducted on the equipment after manufacture.

The contractor shall also furnish the test certificate of bought out components for

approval by the purchaser.

2.4.8 Evaluation: For evaluation of tender total price quoted by the bidder against the full

quantity will only be considered.

2.5 Excise Duty: Excise Duty and Edu. cess at actual at the time of delivery will be paid extra on production of documentary evidence.

2.6 CST: - The prevailing rate of CST is 2% against form-C. However any statutory variation

in CST at the time of despatch shall be paid as per actual. The C form will be issued by the consignee.

2.7 Road permit: Road permit for despatch of the equipments shall be arranged by the

manufacturer/firm paying necessary Entry Tax to the tax department, Govt. of Assam. The entry tax so paid will be reimbursed by APDCL on submission of claim with legal Entry Tax Paid document. APDCL will provide necessary authentication on the Road Permit application.Present applicable entry tax is 4% on (Ex-factory price + ED + Edu cess + F&I +CST/VAT). The concerned consignee will reasonably help in procuring the road permit.

2.8 Post tender revision of quoted rates and /or revision of terms and conditions having

direct or indirect impact on the quoted rate shall not be accepted and the offer could be rejected and earnest money shall be forfeited. Withdrawal of offer within the quoted validity period shall not be accepted and if withdrawn the offer, the earnest money shall be forfeited. Purchaser reserves the right for negotiation of rates, terms and conditions only.

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2.9 Opening of bid:

2.9.1 The techno-commercial Bid shall be opened on the due date and due time or on the next working day in case of the due date being a holiday, in presence of the Bidder or their authorized representatives.

2.9.2 The evaluation of bids will be carried out, first of techno-commercial bid and thereafter opening the price bid of only those who qualify and meet the technical requirement.

2.9.3 The price bid of technically approved Bidder will be opened on a separate date after due intimation.

2.9.4 Company reserves the right not to award the order to the price-wise lowest party if the party during evaluation is found to be technically non responsive.

2.10 Terms of payment: 100% payment with all taxes and duties for each lot of supply will be released

within 30 days from the date of receipt of materials in full and in good condition at store/site, by the

consignee . Payment will be released by the CGM(PP&D), APDCL on receipt of the passed bill from

consignee subject to the following conditions:-

a) Supply should be strictly conforming to relevant technical specification.

b) Bill in triplicate along with consignment note and other documents such as

challan, packing list, LR/ RR with revenue stamp where ever necessary should

be sent to the consignee for onward transmission to this office for payment. The

delivery challan to be submitted to the consignee for payment should have

signature with date and seal of the officer receiving the equipments and copy of

LR/RR should be enclosed.

c) Before despatch, clearance from APDCL for each and every consignment

/equipment should invariably be obtained. Inspection report with detailed test

results should be furnished along with each consignment.

d) The supplier should intimate the undersigned the despatch of every consignment

along with supporting documents for our record.

2.11 Insurance: Materials are to be dispatched duly insured to final destination against any loss/damage in transit through underwriter of supplier at their cost.

APDCL shall intimate the supplier of any loss, shortage, damage etc. of materials if any at the time of taking delivery from the carrier within 30 days. Supplier shall arrange replacement of the damage/losses/shortage etc. within 30 days of intimation without waiting for settlement of the claim from the carrier/underwriter.

2.12 Performance Security Deposit: The successful manufacturer/bidder shall have to deposit Performance security deposit in the shape of Bank Guarantee(BG) as per proforma for an amount equivalent to 10% (ten percent) of the contract value of the supply order duly pledged in favour of “ASSAM POWER DISTRIBUTION COMPANY LIMITED, Guwahati-1”. The Performance Bank Guarantee should be issued by any nationalized bank or scheduled bank of RBI having their regional offices in Assam or at least a branch office at Guwahati ( In case of those, whose regional office is not located in the state of Assam) with a certificate from the Bank to the effect that the verification or any confirmation in regard to the BG issued by the bank can be taken up with the Branch office at Guwahati . The BG should be furnished to the CGM(PP&D), APDCL alongwith the acceptance of Letter of Intent (LOI). The validity of the BG should be initially for a period of 60(Sixty) months (for circuit breakers , autoreclosers & 11 KV 9 unit VCB Panel) and 18 (eighteen) months for other

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equipments from the date of issue of LOI with a provision for extension of the same to cover the entire warranty period as per clause 2.13. If the supplier fails or neglects to observe perform any of his obligations under the contract, the APDCL shall have the right to forfeit either in full or in part at its absolute discretion, the performance security Deposit furnished by the supplier. No interest shall be payable on such deposits. Detailed order will be issued on receipt of acceptance of LOI & Performance security Deposit.

2.13 Warranty: Warranty of the equipments will be as follows :

a) 33 & 11 KV Breakers . Autoreclosures & 11 KV 9 unit VCB Panel : 60 (sixty) months from the date of commissioning or 66(sixty six) months from the date of receipt of the materials at our store in good and acceptable condition whichever is earlier .

b) Other Equipments : 18 (eighteen) months from the date of commissioning or 24 (twenty-

four) months from the date of receipt of the materials at our store in good and acceptable condition whichever is earlier .

2.14 The Company reserves the right to reduce the quantity or order them in full or part

thereof in phased manner and also may modify slightly the delivery destination of equipments at any time.

2.15 Liquidated Damage for Delay in Delivery: In case of failure to deliver the materials/equipments in full or to complete the delivery within the stipulated delivery period, APDCL shall be entitled to recover an amount at the rate of 1% of the contract price for the undelivered quantity per week or part thereof of delay, subject to maximum of 10% of the contract price as liquidated damage to APDCL.

2.16 Terms and conditions which are not specified herein above will be governed by APDCL’s General Terms and Conditions of supply and erection in force which may be seen in APDCL website www.apdcl.gov.in.

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SECTION 3

SCHEDULE OF ITEMS TO BE PROCURED

13

NIT NO.CGM (PP&D)/ APDCL/AP-12-13/SS/EQUIPMENTS --------- Dated .08.13

Sl no Item description Unit

Required

Quantity

1 33 KV VCB with GI mounting structure and

marshalling box No 35

2 (i)

33KV Current transformer outdoor type with

terminal connector and all accessories with

Marshalling box .

Rating : 200-100/5-5-5A Set

(=3 nos)

12

2 (ii)

33KV Current transformer outdoor type with

terminal connector and all accessories with

Marshalling box .

Rating : 400-200/5-5A

12

3

33 kV Potential transformer outdoor type

with terminal connector and all accessories

with Marshalling box.

Set

(=3 Nos) 15

4 33 KV 800A Isolator, with earth blade and GI

mounting structure including all accessories set 12

5 (i)

11 KV outdoor CT with terminal connector

and all accessories & Marshalling box

Rating : 600-300/5-5-2.89A Set

(=3Nos)

3

5 (ii)

11 KV outdoor CT with terminal connector

and all accessories & Marshalling box

Rating : 300-150/5-5A

6

6

11 KV outdoor PT with terminal connector

and all accessories with Marshalling box(set

comprising of three unit)

Set

(=3Nos) 9

7

33 KV Autorecloser type VCB, remote

operable as well as localy operable with In-

built Modem & mounting GI Structure

No 9

8

11 KV Autorecloser type VCB, remote

operable as well as localy operable with In-

built Modem & mounting GI Structure

No 19

9 11 KV 630A out door VCB with GI mounting

structure No 6

10

Battery Bank of 110V, 100AH, 55 cells

Maintenance free value regulated lead acid

with rack.

set 9

11

110V DC 100AH, Battery Charger suitable

for charging of 110 V DC 100AH Battery

bank

No 6

12 11 KV 9 unit indoor VCB Panel for 10 MVA

Capacity No. 3

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SECTION 4

QUALIFYING REQUIREMENT OF THE BIDDER

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QUALIFYING REQUIREMENT OF THE BIDDER

4.1 To be qualified for award of contract, the Bidder shall submit a written power of attorney authorizing the signatory of the Bid to commit on behalf of the bidder and must compulsorily meet the following minimum criteria.

4.1.1 The bidder should either be a manufacturer of the equipments offered or authorized dealer for at least for a period of 5 years as on date of submission of bids. He must have supplied the offered equipments and should list such orders executed as Qualifying Requirement.

4.2 Each Technical Proposal must be accompanied by each of the following information/ documents with sufficient details along with other documents and information mentioned elsewhere to enable the purchaser to make an appraisal of the quality and suitability of the material and equipment offered.

4.2.1 Type test certificates of the equipments from a NABL recognized laboratory, preferably at CPRI laboratory should be furnished. The Type test certificates should not be more than 5 (five) years old. The type rest certificates should also be accompanied by the drawings of equipment tested so that the test certificates can be directly linked to the equipments offered.

4.2.2 Equipments which have not been type tested as above shall not be accepted. A promise or agreement by a bidder to have the equipment tested after award of a contract is not acceptable.

4.3 EQUIPMENT CAPABILITIES: The manufacturers' laboratory must be well equipped for

complete range of testing of Equipments. They must have standard power source and

standard equipment with valid calibration certificates. The details of testing facilities

available for conducting a) the routine tests and b) the acceptance tests shall be

furnished in a statement. The manufacturers' laboratory must also have facilities for

stage wise testing of parts during the manufacturing process.

4.4 LITIGATION HISTORY: Bidders shall submit details of all the litigation, arbitration or other

claims, whether pending, threatened or resolved in the last five years, with a cumulative

impact of not more than 10 per cent of their total assets. The Purchaser may disqualify

bidders in the event that the total amount of pending or threatened litigation, arbitration

or other claims represent more than 50 per cent of their total assets.

4.5 BIDDING:

4.5.1 Each Technical Proposal must be accompanied by each of the following information/

documents with sufficient details along with other documents and information mentioned

elsewhere to enable the purchaser to make an appraisal of the quality and suitability of

the material and equipment offered.

4.5.2 Guaranteed and Other Particulars in the formats given in Section – 7. The bid should also be accompanied by manufacturer’s literatures and brochures.

4.5.3 The Bidder's offer shall include and substantiate data on qualifying requirements such as:

Copies of original documents defining the constitution or legal status, place of

registration, and principal place of business, written power of attorney of the signatory of

the Bid to commit on behalf of the Bidder .

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4.5.4 Qualifications and experience of key site management and technical personnel proposed

for the Contract.

4.6 Average Annual Turnover : The average Annual Turnover of the Bidder for the last three

years should not be less than Rs. 5.00 Cr.

4.7 Financial Capability : The Bidder’s offer shall include the following :-

4.7.1 Reports on the financial standing of the Bidder, such as profit and loss statements and

auditor's reports for the past five years.

4.7.2 Evidence of adequacy of working capital for this contract (access to line (s) of credit and

availability of other financial resources) .

4.7.3 Authority to seek references from the Bidder's Bankers .

4.7.4 Information regarding any litigation, current or during the last three years, in which the

Bidder is involved, the parties concerned, and disputed amount.

4.8 Bidders shall also submit proposals of work methods and schedule in sufficient detail to

demonstrate the adequacy of the bidders' proposals to meet the Purchaser's requirements

and the completion time.

4.9 Even though the bidders meet the above qualifying criteria, they are subject to be

disqualified if they have:

4.9.1 Made misleading or false representations in the forms, statements and attachments

submitted in proof of the qualifying requirements,

4.9.2 Record of poor performance such as abandoning the works, not properly completing the

contract, inordinate delays in completions, litigation history, or financial failures etc.

Terms and conditions which are not specified herein above will be governed by APDCL’s General Terms and Conditions of supply and erection in force .

17

SECTION 5

BID PROPOSAL SHEET (To be submitted by bidders)

18

Annexure – I

Tender Proforma part – I (Techno-commercial Bid)

NIT NO.CGM (PP&D)/ APDCL/AP-12-13/SS/EQUIPMENTS --------- Dated 08.13

1 Name and full address of the Bidder.

2 Particulars of payment made for Purchase of tender

document in the shape of

3 Amount of earnest money paid and in the shape of

4 Whether Sales Tax clearance certificate submitted Yes / No

5 Sale Tax Registration No

6 Pan No (in case of firm must be in the name of firm

7

Acceptance of guarantee clause of Materials /equipment

and system Installed individually and for integrated

operation.

Yes/ No

8 Acceptance of penalty clause Yes/ No

9 Acceptance of terms of payment Yes/ No

10 Documentary evidence for manufacturing equipments

during last five years Submitted/Not submitted

11 Type test certificate from NABL accredited laboratory Submitted/Not submitted

12 Details of manpower and T&Ps available with the firm Submitted/Not submitted

13 Performance certificate from at least two utilities Submitted/Not submitted

14

Reports on the financial standing of the Bidder, such as

profit and loss statements and auditor's reports for the past

five years.

Submitted/Not submitted

15

Evidence of adequacy of working capital submitted for

this contract (access to line (s) of credit and availability of

other financial resources)

Submitted/Not

16

Drawings Submitted With The Bid:

General outline drawing

Drawing showing dimensions, plan, sectional view, side

view

Internal circuit diagram

Illustrative & descriptive literature of the equipments.

Submitted/Not submitted

17 List of other documents enclosed

Power Of Attorney for signatory of bid

Signature with full name

and designation of Bidder or

his/her authorised representative with seal

19

Annexure II

DECLARATION

I………………………………………………………………………… authorized

representative of M/S

……………………………………………………………………………………Bidder against

NIT no …………………………………………………………..dtd

…………………………issued by CGM(PP&D), APDCL have gone through all section of the bid

document of the tender and further bind myself/the said M/S

………………………………………………………………to abide by the said terms and

conditions

I also declare that the information submitted by me on behalf of the Bidder are true and

correct to the best of my knowledge and belief. It is also known to me that any deviation of facts

or misleading or false representations in the forms, statements and attachments submitted will

render the bid for outright rejection from participation in the said tender.

Signature with full name

and designation of Bidder

with seal

Form FIN - 1: Average Annual Turnover Each Bidder or member of a JV must fill in this form

Annual Turnover Data for the Last 3 Years

Year Amount (Rs. In lakhs)

Average Annual Turnover

The information supplied should be the Annual Turnover of the Bidder in terms of the amounts billed to clients for each year for contracts in progress or completed in Rs.(Rupees).

Signature with full name

and designation of Bidder

with seal

20

SECTION 6

SCHEDULE OF PRICE

Price schedule

(To be filled by the bidder)

21

NIT NO.CGM (PP&D)/ APDCL/AP-12-13/SS/EQUIPMENTS/01 --------- Dated 21.08.13

Package-I

Signature of the Bidder with detail address

Sl. no Item description Unit

Tendered Quantity

Offered Quantity

1 33 KV VCB with GI mounting structure and

marshalling box No 35

2 (i)

33KV Current transformer outdoor type with

terminal connector and all accessories with

Marshalling box .

Rating : 200-100/5-5-5A Set

(=3 nos)

12

2 (ii)

33KV Current transformer outdoor type with

terminal connector and all accessories with

Marshalling box .

Rating : 400-200/5-5A

12

3

33 kV Potential transformer outdoor type with

terminal connector and all accessories with

Marshalling box.

Set

(=3 Nos) 15

4 33 KV 800A Isolator, with earth blade and GI

mounting structure including all accessories set 12

5 (i)

11 KV outdoor CT with terminal connector and all

accessories & Marshalling box

Rating : 600-300/5-5-2.89A Set

(=3Nos)

3

5 (ii) 11 KV outdoor CT with terminal connector and all

accessories & Marshalling box

Rating : 300-150/5-5A 6

6

11 KV outdoor PT with terminal connector and all

accessories with Marshalling box(set comprising of

three unit)

Set

(=3Nos) 9

7

33 KV Auto recloser type VCB, remote operable as

well as locally operable with In-built Modem &

mounting GI Structure

No 9

8

11 KV Auto recloser type VCB, remote operable as

well as locally operable with In-built Modem &

mounting GI Structure

No 19

9 11 KV 630A out door VCB with GI mounting

structure No 6

10 Battery Bank of 110V, 100AH, 55 cells Maintenance

free value regulated lead acid with rack. set 9

11 110V DC 100AH, Battery Charger suitable for

charging of 110 V DC 100AH Battery bank No 6

12(i) 11 KV 9 unit indoor VCB Panel for 10 MVA

Capacity No. 3

12(ii) 11KV Single unit VCB Panel for outgoing feeder

suitable for adding to 9 unit Panel as above No. 3

22

Schedule-I : Price Schedule for different Equipment

Signature of the Bidder with detail address

Sl no.

Item Unit QTY

Unit Ex factory price Rs.

Excise duty ……..%

Rs.

Education cess

Rs.

Taxes CST/VAT …..% Rs.

F&I for any location

Rs.

Entry tax Rs.

Total unit cost Rs.

Total price Rs.

1 2 3 4 5 6 7 8 9 10 11=(5+6+7+8+

9+10) 12=11x4

a 33 KV VCB with GI mounting structure and marshalling box No 35

b(i) 33KV Current transformer outdoor type with terminal connector and all accessories with Marshalling box . Rating : 200-100/5-5-5A Set

(=3 nos)

12

(ii) 33KV Current transformer outdoor type with terminal connector and all accessories with Marshalling box, Rating : 400-200/5-5A

12

c 33 kV Potential transformer outdoor type with terminal connector and all accessories with Marshalling box.

Set (=3 Nos)

15

d 33 KV 800A Isolator, with earth blade and GI mounting structure including all accessories

set 12

e(i) 11 KV outdoor CT with terminal connector and all accessories & Marshalling box Rating : 600-300/5-5-2.89A Set

(=3Nos)

3

(ii) 11 KV outdoor CT with terminal connector and all accessories & Marshalling box Rating : 300-150/5-5A

6

f 11 KV outdoor PT with terminal connector and all accessories with Marshalling box(set comprising of three unit)

Set (=3Nos)

9

g 33 KV Auto recloser type VCB, remote operable as well as locally operable with In-built Modem & mounting GI Structure

No 9

h 11 KV Auto recloser type VCB, remote operable as well as locally operable with In-built Modem & mounting GI Structure

No 19

i 11 KV 630A out door VCB with GI mounting structure No 6

j Battery Bank of 110V, 100AH, 55 cells Maintenance free value regulated lead acid with rack.

set 9

k 110V DC 100AH, Battery Charger suitable for charging of 110 V DC 100AH Battery bank

No 6

l(i) 11 KV 9 unit indoor VCB Panel for 10 MVA Capacity No. 3

l(ii) 11KV Single unit VCB Panel for outgoing feeder suitable for adding to 9 unit Panel as above

No. 3

Total

23

SECTION 7

TECHNICAL SPECIFICATION

24

CLIMATIC AND ISOCERAUNIC CONDITIONS

The climatic and isoceraunic conditions at site under which the materials /equipment shall operate satisfactorily are as follows:- a) Maximum temperature of air in shade: 40º C b) Minimum temperature of air in shade: 2º C c) Maximum Humidity: 93 % d) Isoceraunic level: 60 e) Average of rainy days per annum: 150 f) Average number of days of thunderstorm per annum: 25 g) Average number of days of dust storm per annum: 10 h) Average annual rainfall: 2280 mm i) Number of months of tropical monsoon per annum: 5 (May to Sept.) j) Maximum wind pressure: 150Kg/sq. m. k) Altitude (above mean sea level): 50 to 250m The reference ambient temperatures assumed for the purpose of this specification are: a) Maximum ambient temperature: 45ºC b) Maximum average daily ambient temperature: 35ºC c) Maximum average yearly ambient temperature: 30º C

25

7.1 TECHNICAL SPECIFICATIONS FOR 36 KV VACUUM CIRCUIT BREAKER

1.0 SCOPE

1.1 This section of specification covers the design, manufacture, assembly under stringent quality control at every stage of manufacturing, testing at manufacturer's works before dispatch, supply and delivery at destination store and supervision of erection, testing and commissioning of 36 KV outdoor type vacuum circuit breakers at various substations in SEB.

1.2 The scope of supply shall also include necessary special tools and plants required for erection, maintenance and necessary spares, required for normal operation and maintenance of the circuit breakers for a period of five years.

1.3 The circuit breakers should be complete in all respects with insulators, bimetallic connectors, interrupting chamber, operating mechanism control cabinet, interlocks, auxiliary switches indicating devices, supporting structures, accessories, etc., described herein and briefly listed in the schedule of requirements. The spares/attachments which are meant necessary for the smooth functioning of the equipment and specifically are not mentioned here shall be assumed to be included the scope of supply.

1.4 It may be noted that the Vacuum Circuit Breaker must meet the following minimum criteria. Failure to comply with the requirements may results in rejection of the BID as non-responsive:

The Manufacturer must have designed, manufactured, type tested and supplied vacuum circuit breaker in at least two power utilities of similar rating which are in successful operation for at least 5 (Five) years as on the date of bid opening which should be substantiated by furnishing performance report from the official of the rank not below DGM/SE

2.0 STANDARDS

2.1 The circuit breaker shall conform in all respects to the requirements of latest issue of IS/IEC specifications except for modifications specified herein. The equipment manufactured according to any other authoritative standards which ensure an equal or better quality than the provision of IS/IEC specifications shall also be acceptable. The salient point of difference between the proposed standard and provision of these specifications shall be clearly brought out in the tender. A copy of English version of such specifications shall be enclosed with the tender.

The list of standards mentioned in this specification and to which the circuit conform is given below: 1.

IEC-56 High Voltage A.C. Circuit Breakers

2 IEC-137 Bushing for alternating voltage above 1000 volts

3. IEC-71 Insulation Co-ordination

4. IEC-694 Common clauses for high voltages switchgear and control gear standards

5. IEC-815 Specification for Creepage distance

6. IS-13118 Specifications for high voltage alternating current circuit breakers

7. IS-2099 High voltages porcelain bushings

8. IS-4379 Identification of the contents of industrial gas cylinders

9. IS-3072 Installation and maintenance of switchgear

10. IEC-267 Guide for testing of circuit breakers with respect to out

of phase switching

26

11. IS-802 Code of practice for use of structural steel in overhead

transmission lines

12.

IEC-17A5 study Group Dec.1981

Sealing of interrupters I breakers

13. IS-1554 PVC insulated cables upto and including 1000 volts

14. IS-5 Colors for ready mixed paints and channels

3.0 CLIMATIC CONDITONS

The breakers and accessories to be supplied against this specification shall be suitable for satisfactory continuous operation under the tropical conditions specified in this bidding document.

4.0 AUXILIARY POWER SUPPLY

4.1 Auxiliary electrical equipment shall be suitable for operation on the following supply system.

a. Power Devices (like drive motors) 415 V, 3 phase 4 wire 50 hz, neutral grounded AC supply

b. DC Alarm, Control and Protective Devices 110 V DC,

c. Lighting 240 V, single phase 50 Hz AC supply

4.2 Each of the foregoing supplies shall be made available by the Purchaser at the terminal point for each circuit breaker for operation of accessories and auxiliary equipment. Bidder's scope includes supply of interconnecting cables, terminal boxes, etc. The above supply voltage may vary as indicated below and all devices shall be suitable for continuous operation over the entire range of voltages

1) AC Supply 415V (+ 10% /-- 15%)

2) Frequency 50Hz (± 5%)

3) DC Supply 110V ( - 15% to + 10%)

5.0 GENERAL REQUIREMENT OF 36 KV/OUTDOOR VACUUM CIRCUIT BREAKERS

5.1 The vacuum type circuit breaker shall have vacuum interrupters, designed to provide a long contact life at all currents upto rated making and breaking current during switching operation: The vacuum interrupters sealed for life shall be encapsulated by porcelain insulators for out door installation requirement of the circuit breakers. The offered breakers shall be suitable for out door operation under climatic conditions specified without any protection from sun, rain and dust storm.

5.2 The vacuum interrupters of each phase shall be housed in a separate porcelain insulator. The three identical poles shall be mounted on a' common base frame and the contact system of three poles should be mechanically linked to provide three pole gang opening/closing for all type of faults.

i) The performance of breakers shall be adequately proven by type tests for the designed rating at internationally reputed independent testing station.

ii) The offered equipment shall be practically maintenance free over a long period.

iii) All mechanical parts and linkages shall be robust in construction and maintenance free, over at least 30,000 switching operations except for lubrication of pins/articulated joints at interval of 5 years or 5000 operations.

iv) Similar parts shall be strictly interchangeable without special adjustment of individual fittings. Parts requiring maintenance shall be easily accessible, without requiring extensive dismantling of adjacent parts.

v) The operating mechanism will be self maintained and of proper operation endurance not less than the mechanical life of circuit breaking unit. It shall be spring operated type described hereinafter.

vi) The circuit breaker shall be supplied complete with all auxiliary equipment meant necessary for the safe operation, routine and periodic maintenance. All internal wiring

27

including those of spare auxiliary contacts shall be complete and wired upto terminal blocks situated near cable gland plate.

vii) The breaker shall be totally restrike free under all duty conditions and shall be capable of performing the duties without opening resistor. The details of any device incorporated to limit or control the rate of rise of restriking voltage across the circuit breaker contacts shall be stated.

viii) The breaker shall be reasonably quiet in operation and the noise level shall not exceed 140 decibels.

ix) The breaker shall be suitable for three phase reclosing operation.

x) An operation counter, visible from the ground level even with the mechanism housing closed shall be provided.

6.0 VACUUM INTERRUPTER ASSEMBLY

6.1 Each pole of the circuit breaker shall be provided with vacuum interrupter, one for each phase, hermetically sealed for life and encapsulated by ceramic insulators. The interrupter shall be provided with steel chromium are chamber to prevent vaporized contact material being deposited on the insulating body. A further shield giving protection to the metal bellows shall also follow the travel of the moving contacts to seal the interrupter against the surroundings atmosphere.

6.2 It shall have high and consistent dielectric strength of vacuum unaffected by environment and switching operations. Bronzed joints should ensure retention of vacuum for life time. It shall have low and stable contact resistance due to absence of oxidation effects and shall ensure low power loss. The arcing voltage shall be low with minimum contact erosion.

6.3 The manufacturer of VCB should use their own Vacuum interrupter so that the drive mechanism is matched perfectly with that of the requirement of Vacuum Interrupter.

6.4 The vacuum bottles should be capable of withstanding minimum 100 full short circuit operations as per test duty 1 to 5 of IEC-56. The vacuum bottles, capable of withstanding less than 100 full short circuit faults, would not be considered and therefore should not be offered.

6.5 A manufacture’s type test reports / literature for vacuum bottles, may, therefore be supplied along with tender in duplicate.

6.6 Vacuum Interrupters of China make should not be offered.

7.0 FIXED AND MOVING CONTACT

7.1 The fixed and moving contacts of the breaker have to ensure permanent full contact during closing without unusual maintenance. All making and breaking contacts shall be hermetically sealed and free from atmospheric effects.

7.2 The contacts metallurgy and geometry shall be such that there is minimum contact burning and wear. Main contact shall have ample area and contact pressure for carrying the rated current and rated short time current without excessive temperature rise which may cause pitting or welding of the contacts.

7.3 The main contacts should have low contact resistance. The contact should be self cleaning type, i.e., the layer of copper oxide should be cleaned during rubbing of contacts. The contact area should be well defined, spring used for contact shall be of gradually rising characteristic i.e., they should be soft. The contacts should not provide contact grip, ie., electro-magnetic forces should not grip the contacts and oppose the opening process. It would be desirable to have separate main contacts and arcing contacts in order to have longer life of the contacts. The contours of the energized metal parts of the breaker shall be such as to eliminate areas or points of high electrostatic flux concentration. Surfaces shall be smooth with no projection or irregularities which may cause visible corona. No corona shall be visible in complete darkness when the equipment is subjected to the specified test voltage.

7.4 The circuit breaker units shall be suitable for installation on outdoor R.C.C. foundations. Ground clearance of the live parts of the breakers should be 3700 mm from foundation. The circuit breakers shall be spring operated.

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8.0 RECOVERY VOLTAGE AND POWER FACTOR

8.1 The circuit breaker shall be capable of interrupting rated power with recovery voltage equal to the rated maximum line to line service voltage at rated frequency and at a power factor equal to or exceeding 0.15.

9.0 RESTRIKING RECOVERY and LINE CHARGING INTERRUPTING CAPACITY

9.1 The complete data for the phase factor, amplitude factor, etc., for rate of rise of restriking voltage shall be furnished in the tender.

9.2 The circuit breaker shall be designed so as to be capable of interrupting line charging currents without undue rise in the voltage on the supply side without restrike and without showing sign of undue strains.

9.3 The maximum permissible switching over voltage shall not exceed 2.5 p.u. The guaranteed over voltage, which will not be exceeded while interrupting the rated line charging current for which the breaker is designed to interrupt shall also be stated. The results of the tests conducted along with the copies of the oscillographs to prove ability of the breakers to interrupt the rated as well as lower values of the line charging current shall be furnished with the tender.

10.0 TRANSFORMER CHARGING CURRENT BREAKING CAPACITY

10.1 The breaker shall be capable of interrupting inductive currents, such as those occurring while switching off unloaded transformers, without giving rise to undue over voltage and without restrikes. The maximum over voltage value, which will not be exceeded under such conditions, shall be stated in the tender.

11.0 BREAKING CAPACITY FOR SHORTLINE FAULTS

11.1 The interrupting capacity of the breaker for short line faults shall be stated in the tender. The details of the test conducted for proving the capability of the breaker under a short line fault occurring from one phase to earth conditions shall also be stated in the tender. The rated characteristics for short line faults shall be in accordance with stipulation contained in clause 8.0 of IEC-56(2)-1971.

12.0 AUTOMATIC RAPID RECLOSING and OUT OF PHASE SWITCHING

12.1 36 KV circuit breaker shall be suitable for 3 pole rapid reclosing. The dead time of the breaker shall be adjustable and the limits of the adjustment shall be stated in the tender.

12.2 The circuit breaker shall be capable of satisfactory operation even under conditions of phase opposition that may arise due to faulty synchronization. The maximum power that the breaker can satisfactorily interrupt under "Phase Opposition" shall be stated in the bid".

13.0 TEMPERATURE RISE

13.1 The maximum temperature attained by any part of the equipment when in service at side and under continuous full load conditions and exposed to the direct rays of the sun shall not exceed the permissible limits fixed by IEC. When the standards specify the limits of temperature rise these shall not be exceeded when corrected for the difference between ambient temperature specified in the approved specification.

13.2 The limits of temperature rise shall also be corrected for altitude as per IEC and stated in the bid.

14.0 INSULATORS SUPPORTS AND HOUSING

14.1 The basic insulation level of the external insulator supporting shall be as stated in the "Technical Parameters" and these shall be suitable for use under climatic conditions as stated elsewhere in the specification. The porcelain used shall be homogenous, free from cavities and other flaws.

14.2 The insulators shall be designed to have ample insulation, mechanical strength and rigidity for satisfactory operation under conditions specified above.

14.3 All bushings of identical rating shall be interchangeable. The puncture strength of bushing shall be greater than the flash over value. The design of bushing shall be such that the complete bushing in a self-contained unit and no audible discharge shall be detected at a voltage upto a working voltage (Phase Voltage) plus 10%. The support insulator shall

29

conform to IEC-137.

14.4 Minimum clearance between phases, between live parts and grounded objects shall be as per IS-3072-1975 and should conform to Indian Electricity Rules-1956. The minimum creepage distance for severely polluted atmosphere shall be 27 mm/KV.

14.5 The air clearance of bushing should be such that if the bushings were tested at an altitude of less than 1000 meters, air clearance would withstand the application of higher voltages (IS-2099-1973 para 6.1). In order to avoid breakdown at extremely low pressures the support insulators should not be covered by moisture and conducting dust. Insulators should therefore be extremely clean and should have anti-tracking properties. Sharp contours in conducting parts should be avoided for breakdown of insulation. The insulators shall be capable to withstand the seismic acceleration of 0.5 g in horizontal direction and 0.6g in vertical direction.

15.0 OPERATING MECHANISM GENERAL REQUIREMENTS

15.1 The operating mechanism shall be stored energy type and capable of giving specified duty of the breaker The breaker shall also pass the operational test which ascertain the capabilities of operating mechanism. The operating mechanism shall be capable to perform the following functions efficiently.

i) To provide means where the circuit breaker can be closed rapidly, without hesitation at all currents from zero to rated making current capacity.

ii) To hold the circuit breaker in closed positions by toggles or latches till the tripping signal is received.

iii) To allow the circuit breaker to open without delay immediately on receiving tripping signal.

iv) Operating mechanism should also be suitable for three phase auto reclose duty. The closing spring shall be automatically charged by motor immediately after closing operation.

v) In case of failure of supply to the spring charging motor, the spring shall be chargeable by hand crank.

vi) The contact pressure spring and tripping spring shall be chargeable during closing operation to ensure the breaker is ready to open.

vii) Mechanically ON/OFF indicator, spring charged indicator and operation counter shall be provided on the front of the control cubicle. For tripping, the spring provided shall ensure the trippings.

16.0 Tripping/Closing Coils

16.1 The circuit breakers shall be provided with two trip coils and one closing coil per breaker. First trip coil shall be utilized for tripping the breaker on main protection fault detection. Whereas second trip coil shall be used to trip the breaker when first trip coil fails to trip the breaker and backup protection comes into operation and shall also be used to trip the breaker on command.

16.2 The trip coils shall be suitable for pre-closing and after closing trip circuit supervision. All the breakers shall have provision for independent electrical operation of trip coils from local as well as remote through local/remote selector switch. The breaker shall be provided with suitable protection device against discrepancies in the operation of individual pole.

16.3 Closing coil shall operate correctly at all value of voltage between 85% and 110% of the rated voltage. Shunt trip coils shall operate correctly under all operating conditions of the circuit breaker upto the rated breaking capacity and at all values of supply voltage between 70% and 110% of rated voltage.

16.4 Trip Free Features

a. When the breaker has been instructed to close by manual instructions by pushing of push button, the operating mechanism will start operating for closing operations. If in the mean time a fault has taken place, the relay provision shall be such that it should close the trip circuit simultaneously interrupting the live circuit of closing coil which has been instructed for close command.

30

b. The trip free mechanism shall permit the circuit breaker to be tripped by the protective relay even if it is under the process of closing. An antipumping device to prevent the circuit breaker from reclosing after an automatic opening shall be provided to avoid the breaker from pumping i.e., anti pumping relay should interrupt the closing coil circuit.

17.0 Controls

17.1 The circuit breaker shall be controlled by a control switch located in the control room. The control arrangement shall be such as to disconnect the remote control circuits of the breaker, when it is under test.

17.2 Local control devices, selector switch and position indicator shall be located in weather and vermin-proof cabinet.

17.3 The circuit breaker control scheme shall incorporate trip circuit supervision arrangement. Local/remote selector switch shall be provided for all breakers for selection of "Local" control/remote control. Provision shall be made for local manual, electrical and spring controls. Necessary equipment's for local controls shall be housed in the circuit breaker cabinet of weather-proof construction. In addition to this, a hand closing device for facilitating maintenance shall also be provided.

17.4 Each circuit breaker shall have a mechanical open/closed and spring charge indicator in addition to facilities for provisions for semaphore indicators for breakers which are required for the mimic diagram in the control room.

17.5 Lamps for indicating, 'close/open' position of the breaker shall also be provided.

17.6 Mechanical indicator, to show the 'open' and 'close' position of the breaker shall be provided in a position where it will be visible to a man standing on ground with mechanism housing open. An operation counter, visible from the ground even with the mechanism housing closed, shall be provided. Electrical tripping of the breaker shall be performed by shunt trip coils.

17.7 Operating mechanism and all accessories shall be enclosed in control cabinet. A common marshalling box for the three poles of the breaker shall be provided, along with supply of tubing, cables from individual pole operating boxes to the common marshalling box, local.

18.0 SPRING OPERATED MECHANISM and MOTOR

18.1 The motor compressed spring mechanism shall consist of a closing spring which is wound or compressed by an electric motor immediately after the breaker closes. The closing action shall also wind or compress a tripping springs shall be wound.

18.2 After the breaker has tripped, the tripping spring shall remain in the released position as long as the breaker is open, but the closing spring shall remain wound and ready for closing operation. Spring charging motor shall be standard single phase universal motor suitable for 220 volts supply.

i) Operating voltages for closing/tripping coils shall be 110 Volts DC.

ii) Operating voltages for heater elements shall be 220V AC 50 HZ. Other features of the spring operated mechanism shall be as follows.

18.3 The spring operating mechanism shall have adequate energy stored in the operating to close and latch the circuit breaker against the rated making current and also to provide the required energy for tripping mechanism in case the tripping energy is derived from the operating mechanism.

18.4 The mechanism shall be capable of performing the rated operating duty cycle of 0-0.3Sec-CO-3 Min-CO as per IEC-56.

18.5 The spring charging motor shall be AC/DC operated and shall not take more than 30 sec., to fully charge the closing spring made for automatic charging. Charging of spring by the motor should not - interfere with the operation of the breakers.

18.6 The motor shall be adequately rated to carry out a minimum of one duty cycle. Also provision shall be made to protect the motor against overloads.

18.7 In case of failure of power supply to spring charging motor, the mechanism shall be capable of performing one open-close-open operation.

18.8 Mechanical interlocks shall be provided in the operating mechanism to prevent

31

discharging of the closing springs when the breaker is already in closed position. Provision shall be made to prevent a closing operation to be carried out with the spring partially charged.

18.9 Facility shall be provided for manual charging of closing springs.

19.0 CONTROL 20.0 operating CABINET

20.1 The switchgear mechanism, the control equipment such switch for closing and tripping the breakers, various control relays, antipumping device, timer for adjusting breaker reclosing, a set of terminal blocks for wiring connections, MCB's for disconnecting the control auxiliary power supplies. Including relays, etc., shall be enclosed in a cabinet to 'be mounted on a suitable structure at a convenient working height at the end of the breaker in the outdoor switchyard. The supporting structure and the enclosure shall be capable of withstanding the typical tropical climatic conditions, change of ambient temperature, severe dust-storms, very high relative humidity those are prevailing at the site of location of switchgear .

20.2 The enclosure shall be made out of stretched level steel plates not less than 3.15 mm thick and of light section structural steel. It should be weather proof as well as vermin proof and conforming to IP: 55 degree of protection.

20.3 Each cabinet section shall have full width and full length hinged doors mounted on the front that swing fully open. The doors shall be provided with latches to securely hold it with the cabinet. Doors shall be of sturdy construction, with resilient material covering, to provide dust protection and prevent metal to metal contact except at the latch points. Filtered ventilation shall be provided along with the rigid supports for control and other equipment, measuring instruments, mounting cabinet members and equipment shall not restrict easy access to terminal blocks for terminating and testing external connection or to equipment for maintenance.

20.4 All screws and bolts used for assembling and mounting wire and cable termination, supports, devices and other equipment shall be provided with lock washers or other locking devices. All metal parts shall be clean and free of weld splatter, rust and mill scale prior to application of double coat of zinc chromate primer which should be followed by an Polyurethane paint to serve as base and binder for tile finishing coat. The exterior of the cubicle shall be painted matty grey to shade NO.692 of IS-5 or shade No.631 and interior to white shade. Sufficient quantity of paints shall also be supplied along with the cubicle to restore at site any damage during transportation. The mounting structure shall be galvanized and shall be as per IS-802-11-1978.

20.5 Suitable heaters shall be mounted in the cabinet to prevent condensation. Heaters shall be controlled by thermostat ON/OFF switches and fuses shall be provided. Heaters shall be suitable for 240 V AC supply voltage.

20.6 At least one 20 watts fluorescent tube fixture and lamp holder working on 240V, 50 c/s AC supply shall be provided in each switchgear control cubicle section and shall be located to provide adequate interior lighting of the cubicle. Ballasts shall be rated at not less than 0.90 power factor. A single pole 20 Amp. ‘T’ rated lighting switch shall be provided for each cubicle, flush-mounted on the left end. One duplex 220 volt convenience outlet shall be provided inside each door or pair of doors inside each cubicle. The lighting and convenient outlet circuits shall be completely wired in conduit and terminated on cubicle terminal blocks.

20.7 Unless otherwise specified control wire shall be stranded tinned copper stranded wire with 1.1 KV PVC insulation conforming to the requirements of IS-1554.

All the control circuit and secondary wiring shall be wired completely and brought out preferably to a vertical terminal block ready for external connections in the control cabinet. The control wire shall not be of cross-section less than 2.5 mm

2 copper.

20.8 All spare auxiliary contacts of the circuit breaker shall be supplied wired upto terminal block.At least 20 number spare terminals shall be provided over and above the number required. All wiring termination on terminal blocks shall be made through lugs. For current and DC supply circuits disconnecting sturdy type terminal blocks will be provided. For other control circuits, non-disconnecting snap on type terminal blocks shall be provided.

All wires shall be identified with non-metallic sleeve or tube type markers at each terminations.

20.9 Terminal blocks shall be made up of molded non-inflammable plastic material with blocks and barriers molded integrally have white marking strips for circuit identification and moulded plastic covers.

32

20.10 A ground bus of copper bar not less than 6 mm by 25 mm shall be provided along the inside of the front or rear of the each cubicle and equipment rack. The ground bus shall be bolted to the frame of each panel in such a way as to make good electrical contact with each panel or section. Lugs shall be provided for connection of the ground bus to the station ground bus/earth mat.

21.0 ACCESSORIES

21.1 Each circuit breaker assembly shall be supplied with the following accessories.

i) Line and earthing terminals and terminal connectors.

ii) Control housing with:

a) One auxiliary switch with adequate number of auxiliary contacts, but not less than 12 nos. (6 No + 6 NC) for each breaker. These shall be over and above the No. of contacts used for closing, tripping and 'reclosing' and interlocking circuit of the circuit breaker. All auxiliary contacts shall be capable of use as "Normally closed" or "Normally open" contacts. Special auxiliary contacts required for the reclosing circuit if any, shall also be provided. There shall be provision, to add more auxiliary contacts at a later date, if required.

b) Operation counters

c) Position indicator (Close/Open)

d) Necessary cable glands

e) Fuses

f) Manual trip device and local test push buttons

g) Terminal blocks and wiring for all control equipment and accessories

h) Adequate number of heaters for continuous operation to prevent moisture condensation in the housing of operating mechanism

i) Selector switch for local/remote control.

22.0 SUPPORTING STRUCTURE

22.1 The circuit breakers shall be supplied complete with necessary galvanized steel supporting structures, foundation and fixing bolts, etc., the galvanizing shall be as per IS. The mounting of the breaker shall be such as to ensure the safety of the operating staff and should conform to Indian Electricity Rules, 1956. Minimum ground clearance of live part from ground level shall be 4000 mm inclusive of foundation (300mm above GL).

22.2 The bidder shall submit detailed design calculations and detailed drawings in respect of supporting structures suitable for the equipment offered. The tenders shall specify the loads which shall be transmitted to the equipment foundation under most adverse operating conditions of the breaker.

22.3 Facility to earth the circuit breaker structure at two points shall be provided.

23.0 GALVANISING

All ferrous parts including all sizes of nuts, bolts, plain and spring washers, support channels, structures, shall; be hot dip galvanized conforming to latest version of 18:2629 or any other equivalent authoritative standard.

24.0 CABLE TERMINATION

Suitable cable glands for terminating the multi-core cable shall be provided wherever required.

25.0 TERMINAL CONNECTIONS AND EARTH TERMINALS

25.1 Each circuit breaker connected with incoming and outgoing feeders shall be provided with solder less clamp type bimetallic connectors suitable for ACSR/AAAC conductor mentioned in 'Technical Parameter'.

26.0 INTERTERLOCKS

26.1 Necessary interlocks to prevent closing or opening of the breaker under low pressure of the contact spring and devices for initiating alarm shall be provided. Provision shall also be made to enable electrical interlocking with the isolators associated with the breaker to

33

prevent opening or closing of the isolators. 27.0 TYPE TESTS

Type test certificates for the following tests, as per IS:13118 or IEC 62271-100 with

latest amendment thereof, from any of the NABL accredited Laboratory shall invariably be

furnished

a. Short circuit duties test b. Short time withstand current and peak withstand current tests c. Temperature rise test d. Mechanical endurance test e. Lightning impulse voltage withstand test f. Power Frequency withstand voltage test (dry & wet) g. Single Capacitor bank switching test h. Degree of protection IP-55 as per IS:13947:93(Part-I)/IEC 60529:89 Type test certificates must accompany drawing of type tested equipment, duly sealed

& signed by type testing authority.

Type tests conducted on the equipment should not be earlier than 3 years from the date of

opening of bids.

In case of any change in design/type of breaker already type tested and the one

being offered against this specification, the Employer reserves the right to demand repetition

of some or all tests without any extra-cost at NABL accredited lab.

28.0 ACCEPTANCE AND ROUTINE TEST :-

Employer shall have access at all times to the works and all other places of manufacture

where the Circuit Breakers are being manufactured and the Bidder shall provide all facilities

for unrestricted inspection of the Bidder/manufacturer’s works, raw materials, manufacture of

all the accessories and for conducting necessary tests as detailed herein. The Employer

reserves the right to insist for witnessing acceptance/routine testing of the bought out items.

The Bidder/manufacturer shall submit the routine test certificates of bought out items and raw

material also, at the time of routine testing of the fully assembled breaker

No material shall be dispatched from its point of manufacture unless the material has been

satisfactorily inspected and tested.

Bidders shall indicate the inspections and checks carried out at various stages of manufacture

of the circuit breakers. Complete record of stage inspection would be kept by the

Bidder/manufacturer and this record should be made available for inspection by the

representative of the Employer. Bidder/manufacturer should indicate the manufacturing

programme and the The Employer will have a right to depute inspecting officers during the

manufacture of the equipment. The Employer reserves the right to carry out stage inspections

at all stages, for which advance intimation shall be given and all necessary cooperation shall

be rendered by the manufacturer.

At the time of inspection, Bidder/manufacturer shall identify each and every item/accessories

of the particular Circuit Breaker under testing. Unless all the items are identified, the

manufacture will not be treated as complete. Various tests stipulated in IS/IEC shall be

performed in the presence of the Employer’s engineers or when the inspection waiver has

been given, in such a case, testing shall be done at the manufacturer's works as per IS/IEC

stipulations and same should be confirmed by documentary evidence by way of Test

Certificate which shall be got approved by the Employer.

It is expected that before circuit breaker is finally offered for inspection, internal testing of the

same for various important parameters are already done. Routine test report for such tests

shall also accompany the letter of inspection call so that the Inspecting Officer at the time of

inspection may verify the parameters brought out in the preliminary report. Details of all tests

should be clearly brought out.

In case for any reason, inspection is not completed or equipment is not found to be complete

with all accessories as per confirmation given with the letter of inspection call, the Employer

will reserve the right to recover complete cost of deputation of inspecting team to the works of

the manufacturer.

34

Acceptance of any quantity of circuit breaker & its accessories shall in no way relieve the

successful bidder of his responsibility for meeting all the requirement of this specification and

shall not prevent subsequent rejection if such equipments are later found to be defective.

29.0 RATING PLATES & SURFACE FINISH PAINTING & GALVANISING:-

Each circuit breaker shall be provided with a detailed rating plate. Details on the rating plate

shall be as per ISS and shall also indicate manufacturer name, serial no., order no. and

month & year of dispatch.

All interiors and exteriors of tanks, mechanism, enclosures, cabinets and other metal parts

shall be thoroughly cleaned to remove all rust, scales, corrosion, greases or other adhering

foreign matter. All steel surfaces in contact with insulating oil, as far as accessible, shall be

painted with not less than two coats of heat resistant, oil insoluble, insulating paint.

All metal surfaces exposed to atmosphere shall be given two primer coats of zinc chromate

and two coats of epoxy paint with epoxy base thinner or hot dip galvanized or two packs of

aliphatic polyurethane finished paint. All metal parts not accessible for painting shall be made

of corrosion resistant material. All machine finished or bright surfaces shall be coated with a

suitable preventive compound and suitably wrapped or otherwise protected. Paints shall be

carefully selected to withstand tropical heat and extremes of weather within the limits

specified.

Paint shall not scale off or wrinkle or be removed by abrasion due to normal handling. All

external paintings shall be as per shade no. 697 or any other suitable shade of IS:5 or

polyurethane paint

All ferrous parts & steel structure including all sizes of nuts, bolts, plain and spring washers,

support channels, structures, etc. shall be hot dip galvanized or stainless steel or electro-

galvanized.

30.0 DOCUMENTATION

30.1 List of Drawings and Documents: Bidders shall furnish four sets of relevant descriptive and

illustrative published literature, pamphlets and following drawings for preliminary study;

(a) General outline drawings showing dimensions and shipping weights. (b) Sectional views showing the general constructional features of the circuit breaker including operating mechanism, arcing chambers, contacts with lifting dimensions for maintenance. (c) All drawings & data typical and recommended schematic diagram for control supervision & reclosing shall be annotated in English. . (d) Schematic diagrams of breaker offered for control supervision and reclosing. (e) Structural drawing, design calculations and loading data for support structures. (f) Short circuit oscillogram & certificates for similar type tested breakers. General arrangement of foundation and structure mounting plan including weights of varnish components and impact loading data for foundation design. (g) Type test reports.

30.2 Successful bidders shall, within two weeks of placement of order, submit four sets of final

version of all the above drawings for the Employer's approval. The Employer shall

communicate his comments/approval on the drawings to the Bidder/manufacturer within two

weeks. Bidder/manufacturer shall, if necessary, modify the drawings and resubmit four copies

of the modified drawings for the Employer's approval within two weeks from the date of

comments. After receipt of the Employer's approval, the Bidder/manufacturer shall, within

three weeks, submit 4 prints per breaker and two set of good qualities reproducible of the

approved drawings for the Employer's use.

30.3 Successful bidders shall also furnish two sets each of bound manuals covering erection,

commissioning, operation and maintenance instructions and all relevant information and

drawings pertaining to the main equipment as well as auxiliary devices along with each

breaker. Marked erection drawings shall identify the component parts of the equipment as

shipped to enable erection by the Employer’s own personnel. Each manual shall also contain

35

one set of all the approved drawings, type test reports as well as acceptance reports of the

corresponding consignment dispatched.

30.4 Manufacturing of equipments shall be strictly in accordance with the approved drawings and

no deviation shall be permitted without the written approval of the Employer.

30.5 Approval of drawings/work by the Employer shall not relieve the bidders of any of his

responsibility and liability for ensuring correctness and correct interpretation of the drawings

for meeting the requirements of the latest revision of the applicable standards rules and codes

of practices. Equipment shall conform in all respects to high standards of engineering, design,

workmanship and latest revisions of relevant standards at the time of supply and the

Employer reserves the right to reject any equipment or material which, in his judgment, is not

in full accordance therewith.

31. PACKING AND FORWARDING:

Equipment shall be prepared for ocean shipment (foreign equipment) or rail road transport

(local equipment). Equipment shall be packed in suitable crates in such a manner to protect it

from damage and withstand handling during transit. Bidder/manufacturer shall be responsible

for and make good at his own expense any or all damage to the equipment during transit, due

to improper and inadequate packing and handling. Easily damageable materials shall be

carefully packed and marked with the appropriate caution symbols. Wherever necessary,

proper arrangement for lifting such as lifting hooks etc. shall be provided. Any material found

short inside the packing cases shall be supplied by the Bidder/manufacturer without any extra

cost. Each consignment shall be accompanied by a detailed packing list containing the

following information:

(a) Name of the consignee. (b) Details of consignment. (c) Destination. (d) Total weight of consignment. (e) Sign showing upper/lower side of the crate. (f) Handling and unpacking instructions. (g) Bill of material indicating contents of each package and spare material.

32. COMPLETENESS OF EQUIPMENT AND BOUGHT OUT ITEMS:

Bidders must furnish following information along with technical bid. A list of all the accessories

which will be supplied with the breakers should be furnished. While furnishing the list of

accessories, items which will be manufactured by the Bidders and balance items, which will

be procured from sub-Bidder/manufacturers should be clearly identified and stipulated in the

bid.

33.0 GUARANTEE 33.1 The successful Bidder shall guarantee among other things the following:

a) Quantity and strength of material used

b) Safe electrical and mechanical stresses on all parts of the equipment, under specified conditions of operation

c) The material shall be guaranteed for satisfactory performance, operation for a period of five year (60 months) from the date of commissioning.

33.2 If during the period of guarantee, any of the material, equipments or plant are found defective and/or fail in test or operation, such materials, equipment or plant shall be repaired by the Bidder free of cost to the Purchaser irrespective of the reimbursements from the insurance company within reasonable time which shall in no circumstances be more than 15 days or such other reasonable time as the Purchaser may deem proper to afford failing which the cost of the failed units will be deducted from the subsequent bills,

34.0 NAME PLATE

34.1 Equipment should be provided with name plate giving full details of manufacture, capacities and other details as specified in the relevant ISS or other specification stipulated. The Purchase Order No. and date and year of supply and the "PURCHASER" and clear mention of Name of the Project shall be made.

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35.0 GUARANTEED TECHNICAL PARTICULARS:

35.1 It is obligatory on the part of bidders to furnish Guaranteed Technical Particulars enclosed with the bid document duly filled in complete in all respects. In case Guaranteed Technical Particulars duly filled in complete in all respects is not furnished, the bid may be treated as non-responsive.

35.2 The salient technical particulars of the VCB should be as follows:

Sl. No.

Type of Circuit Breaker Vacuum ,Outdoor

1 Standards Applicable IEC 62271-100 & IS 13118

2 Nominal System Voltage (KVrms) 33 kV

3 Highest system voltage 36kV

4 Rated continuous current at design temperature of 50 deg.C (Amps)

1250A

5 Rated Frequency (Hz) 50

6 Design ambient temperature 50 deg

7 Maximum temperature rise for main contacts over desugn ambient temperature of 50 deg.C

40 deg.C

8 Short time current rating (kA) 25 kA for 3 sec

9 Rated Operating Duty 0-0.3 sec-CO-3 min-CO

10 Operating Mechanism

11 a) Type of operating mechanism for i) Closing ii) Opening

Spring Charging Spring Charging

12

Dielectric withstand voltage

i) One minute dry & wet power frequency withstand voltage

a) Between live terminal and ground (kVrms) 70

b) Between terminals with breaker contacts open (kVp) 70

ii) 1.2/50 micro second impulse withstand test voltage a) Between live terminal and ground (kVp) 170

b) Between terminals with breaker contacts open (kVp) 170

37

7.2 TECHNICAL SPECIFICATION FOR 11 KV VACUUM CIRCUIT BREAKER (OUTDOOR).

1.0 SCOPE :-

1.1 This specification covers design, manufacturing, testing, of 11 KV Porcelain Clad Vacuum

Circuit Breakers complete with all accessories required for its satisfactory operation for the

Sub T transmission solidly grounded system. The Breaker shall be used for Feeder Control/

protection in the system.

1.2 It may be noted that the 11 KV Outdoor Vacuum Circuit Breaker must meet the following

minimum criteria. Failure to comply with the requirements may results in rejection of the BID

as non-responsive:

1.2.1 The Manufacturer must have designed, manufactured, type tested and supplied 11 KV

Outdoor Vacuum Circuit Breaker in at least two power utilities of similar rating which are in

successful operation for at least 5 (Five) years as on the date of bid opening. Which should

be substantiated by furnishing performance report by the official of the rank of minimum

DGM/SE

2.0 TYPE AND RATING :-

2.1 The circuit breaker shall be suitable for outdoor operation under the climatic conditions as

specified in Tender Specification without any protection from sun and rain. The 11 KV circuit

breakers shall have the following rating:-

Sl. No.

Particulars Values

1 Number of Poles 3

2 Nominal System Voltage 11kV

3 Highest System Voltage 12kV

4 Frequency 50 Hz

5 Interrupting capacity at nominal system voltage 500MVA

6 Rated continuous Current 630A

7 Short Circuit current 25kA for 3 sec

2 Lightning Impulse Voltage 75 kVp

9 One min power frequency withstand voltage 28kV rms

10 Total break-time for any current up to the rated breaking current

5 cycles

11 Control Circuit Voltage 110Volt DC

12 Operating Duty for gang operation O-0.3sec.-CO-3 min-CO

13 Minimum Clearances

14 a) Phase to Phase 280mm

15 b) Phase to Earth 190mm

16 c) Live part to ground 2750mm

17 Minimum Creepage distance 300mm

2.2 The above is minimum requirement. The suppliers may offer their standard design keeping in

view the minimum requirements.

2.3 The circuit breakers shall comply with the requirements of IS:13118(1991) or IEC 62271-100

with latest amendment thereof.

3.0 VACUUM INTERRUPTER

3.1 The design of the vacuum interrupter shall be such that it gives trouble free operation under

normal load and fault conditions throughout the life of the equipment. As the efficiency of the

breaker depends on the degree of vacuum inside, it has to be ensured by the that

manufacturer that the it is maintained consistently during service. To know the residual life

38

of vacuum interrupter, an indicator/means to indicate status of contact erosion should

be provided.

3.2 Insulating ceramic body of the interrupter should have high mechanical strength and it should

be capable of withstanding high temperature without any significant deterioration in its

mechanical and electrical properties.

3.3 The metal/alloy used for the fixed and moving contacts shall have very low resistivity and low

gas content. They should be resistant to arc erosion and the contact should have no tendency

to get cold welded under the high vacuum in the interrupter.

3.4 The interrupter design should ensure rapid de-ionization of the gap so that normal electrical

strength of the gap is restored instantaneously.

3.5 The metallic bellow or any other similar vacuum sealing arrangement should be provided at the

moving contact and should have a long fatigue life.

3.6 Vacuum interrupter is to be supplied from reputed manufacturer such BEL, CGL, ABB or

Areva.

3.7 Manufacturer’s catalogue of vacuum bottle, indicating all the details shall essentially be

submitted and supporting document to be submitted.

4.0 INSULATION OF THE CIRCUIT BREAKER

4.1 The insulation to ground, the insulation between open contacts and the insulation between

phases of the completely assembled circuit breaker shall be capable of withstanding

satisfactorily di-electric test voltage corresponding to specified basic insulation level in the

standard.

5.0 INSULATORS

5.1 Basic insulation level of the insulator and insulating porcelains shall be as specified and

porcelain shall be homogenous and free from cavities and other flaws. They shall be

designed to have ample insulation, mechanical strength and rigidity for satisfactory operation

under conditions specified above. All insulators of identical ratings shall be inter-changeable.

The puncture strength of the insulators shall be greater than the flash over value.

6.0 OPERATING MECHANISM

6.1 The circuit breaker shall be designed for remote control from the control room and in addition

there shall be provision for manual operation of circuit breakers during maintenance and for

local tripping and closing by normal means.

6.2 The circuit breakers shall have operation counter and mechanical “open” and “closed”

indicator, in addition to facilities for remote electrical indication. An operation counter shall

also be provided in the common operating mechanism. The mechanical indicator and

operation counter shall be located in a position where it shall be visible to a man standing on

the ground level with the mechanism housing doors are in closed position.

6.3 The operating mechanism shall be of the spring charging type, by electric control under

normal operation. The mechanism shall be trip free electrically and mechanically. Mechanism

shall also be capable of performing satisfactorily, the re-closing duty cycles.

6.4 All working parts in the mechanism shall be of corrosion resistant materials and all bearings

which require greasing shall be equipped with pressured grease fittings. The mechanism shall

be strong, quick in action and removable without disturbing other parts of the circuit breaker.

6.5 Mechanism and breaker shall be such that the failure of any spring will not prevent tripping

and will not cause tripping or closing.

6.6 Operating mechanism should be motor operated spring charged type preferably without chain

drive.

6.7 Motor for spring charging shall be suitable to perform satisfactorily for input supply voltage of

230V AC 50 Hz with a variation of (+) 10 and (-)20 percent. A.C. motor should have overload

protection.

6.8 Provision should also be made for mounting of mechanism box at an adequate height and

gear ratios shall be so chosen that one man should be able to charge the spring, without any

additional efforts.

39

6.9 The mechanical arrangement should be provided to facilitate manual tripping of circuit breaker

for emergency trip under emergent condition i.e. failure of DC supply, trip coil burnt,

mechanism being defective while arc quenching media is healthy

7.0 MOTORS:

7.1 Motors shall be single phase self-starting induction motor of appropriate capacity for

satisfactory operation for the application and duty as required for driving equipment.

7.2 Motors shall be of self ventilated type having TEFC (totally enclosed fan cooled)

enclosure. Depending upon the capacity and loading conditions Bidder/manufacturer

shall design suitable grease lubricated or oil lubricated bearings for above motors.

Bearing shall be so constructed that the loss of grease and its creeping along with

shaft into motor housing is prevented. It shall also prevent dirt and water from getting into

the motor.

7.3 Continuous motor rating (name plate rating) shall be at least ten (10) percent above the

maximum load demand of the driven equipment at design duty point and the motor shall not

be overloaded at any operating point of driven equipment that will arise in service.

7.4 Motors shall be capable of giving rated output without reduction in expected life span when

operated continuously in the system having the particulars as given in principle parameters.

7.5 All induction motors shall be suitable for full voltage direct-on-line starting. These shall be

capable of starting and accelerating to the rated speed along with the driven equipment

without exceeding acceptable winding temperature even when supply voltage drops down to

80% of the rated voltage.

8.0 CONTROL CUBICLE

8.1 A common control cubicle shall be provided to house electrical controls, monitoring devices

and all other accessories, except those which must be located on individual poles. Cubicle

shall be IP-55 of gasketed weather-proof construction, fabricated from sheet steel of minimum

2.5 mm. thickness. The cubicle shall have front access door with lock and keys. Space

heater, internal illumination lamp, 3-pin 5A socket with individual ON-OFF switches.

8.2 For local operation following shall be provided: -

a) LOCAL/REMOTE selector switch

b) TRIP/NORMAL/CLOSE control switches with pistol grip handle.

8.3 The control circuits shall be designed to operate on 110 DC and it shall be possible to

adopt to work on other voltages by simply changing the operating coils.

8.4 Shunt tripping coils shall be designed to operate satisfactorily within 70% to 110% and

shunt closing coil within 85% to 110% of the rated DC voltage.

8.5 AC Power supply for auxiliaries will be available at 230V single phase 50 Hz.

8.6 Necessary cable glands for the cables of the operating mechanism shall be provided. The

cables used for operation are un-armoured 2.5 sq. mm. copper control cables of 1100V

grade. Cable glands provided may therefore be suitable for 1 no. 7 core and 2 nos. 4

core unarmoured 2.5 sq. mm. copper control cable.

8.7 Circuit breaker shall be provided with trip free mechanism so that tripping instructions

could over-ride the closing instructions. An additional tripping coil shall also be provided in

the trip circuit. The second coil shall have separate tripping lever arrangements in the

mechanism, so as to avail full advantage of second trip coil. Also the two trip coils

shall have separate DC circuits, so that in the event of any short circuit/ damage in any one

of the trip coil, supply is available in the other one.

8.8 Circuit diagram of control circuit of VCB along with operating instructions (DO’S/ DON’T)

shall be embossed on metallic plate duly laminated and the same shall be fixed on the rear

door of the control cubicle from inside.

9.0 WIRING

9.1 Wiring shall be completed in all respects to ensure proper functioning of the control,

protection, monitoring and interlocking schemes.

40

9.2 All wiring shall be carried out with 1100V grade PVC insulated stranded copper conductor of 2.5

sq. mm.

9.3 Each wire shall be identified at both ends with permanent markers bearing wire numbers as per

wiring diagram.

9.4 Wire termination shall be done with crimping type connectors with insulating sleeves.

Wires shall not be spliced between terminals.

9.5 All spare contacts of auxiliary switches etc. shall be wired up to terminal blocks in the

control cubicle.

10.0 TERMINAL BLOCKS

10.1 Terminal blocks shall be of 1100V grade, box clamp type ELMEX 10 sq.mm or approved

equivalent. Not more than two wires shall be connected to any terminals. Spare terminals,

equal in number to 20% of active terminals, shall be provided.

10.2 Terminal block shall be such located that it allows easy access. Wiring shall be so arranged

that individual wires of an external cable can be connected to consecutive terminals.

11.0 TERMINAL CONNECTORS

11.1 All circuit breakers shall be provided with 6 nos. terminal connectors suitable to receive Wolf

ACSR/AAA conductors. Clamps shall be designed adequately to take care of any bimetallic

effect. Terminal connectors shall be tested for short circuit current capability, temperature

rise.

11.2 Terminal connector shall also meet the following requirements:

a) Terminal connectors shall be manufactured & tested as per IS:5561 or equivalent

international specifications.

b) All castings shall be free from blow holes, surface blisters, cracks and cavities. All sharp

edges and corners shall be blurred and rounded off.

c) No part shall be less than 12 mm thick.

d) Nuts, bolts & washers used in the current path shall be stainless steel.

e) Bimetallic strips/sleeve copper alloy liner of minimum thickness of 2mm shall be cast integral with Aluminum body.

f) All current carrying parts shall be designed and manufactured to have minimum contact resistance. g) Terminal connectors should be made of Aluminum Alloy and manufactured by gravity die- casting process only. Sand die-casted connectors are not acceptable. h) Size of terminal connector for which the clamp is designed and also rated current under site conditions shall be embossed/ punched on each part of clamps, except hardware. i) Conductor shall be tightened by at least four bolts. Conductor hold length must not be less than 60 mm. j) Surface of clamps to be tightened by bolts should be flat in shape, so that it may be possible

to open the nuts and bolts by normal spanners. Therefore, any type of groove in the clamp

body for fixing of nuts should be avoided.

k) Portion of clamp to hold the conductor should be flat and straight and not zigzag in

construction at both the sides, so that heating of clamp by throttling action of current may be

avoided.

l) Space of at least 50% of diameter of nuts should be available after hole at both the sides of

conductor holding portion for better mechanical strength.

12.0 AUXILIARY CONTACTS

12.1 Eight numbers each of auxiliary contacts both of the normally open and normally closed types

shall be provided in each circuit breaker for use in remote indication and control scheme of

the circuit breaker and for providing safety interlocking. Special contacts for use with trip coils

which permit for relative adjustment with respect to the travel of the circuit breaker shall also

be provided. Wherever required, there shall be provision to add more auxiliary contacts at a

later date, if required. All auxiliary contacts shall be placed in a weather proof casing and

current rating of the contacts shall be as mentioned in the bid. Provision shall be available to

convert these spare “normally-open” contacts to “normally-closed” type and vice versa.

41

13.0 ACCESSORIES

13.1 Circuit breaker shall be supplied as a complete unit with internal wiring installed and terminated

in mechanism box and equipped with the following accessories :-

(i) Motor operated spring charged mechanism : 1 No.

(Motor voltage - 230 V AC, 50 Hz)

(ii) Trip coil suitable for 110 V DC : 2 Nos. (iii) Closing coil suitable for 110 V DC : 1 No.

(iv) Pistol grip C.B. Control switch having : 1 No.

Trip /normal /close position

(v) Local/remote selector switch : 1 No.

(vi) Spring Charged indicator: 1 No.

(vii) Manual operating handle for maintenance : 1 No.

(viii) Facility for manual charging of spring : 1 No.

(ix) Operation counter : 1 No.

(x) Auxiliary contacts (8 NO - 8 NC) : 1 Set

(xi) Anti pumping device suitable for 110 V DC : 1 No.

(xii) Bimetallic terminal connectors suitable for : 6 Nos.

connecting WOLF /RACCOON ACSR/AAA conductor.

(xiii) Cubicle illuminating lamp with protective : 1 No.

cage and on/off switch

(xiv) Spare terminals block : 20% of the Total active terminals

(xv) Mechanical ON/OFF Indicator : 1 No.

(xvi) MCB for both AC and DC supply : 1+1 No.

(xvii) Space heater with thermostat and : 1 No.

ON/ OFF switch

(xviii) 3-Pin 5 A socket with on/off switch : 1 Set

(xiv) Earthing terminals : 2 Nos.

(xx) Foundation Bolts : As per requirement

(xxi) Cable glands : As per requirement

13.2 Other accessories which are not specified above, but are required for efficient and trouble

free operation of breaker, should also be provided without any extra cost.

14.0 MOUNTING OF CTs

14.1 The offered steel structures for breakers should also have adequate strength toaccommodate 3

nos. CTs on it with provision of suitable supports from ground.

15.0 TEMPERATURE RISE

15.1 The maximum temperature attained by any part of the equipment, when in service at site,

under continuous full load conditions, exposed to the direct rays of the sun, shall not exceed

45˚ C above ambient temperature. The limits of temperature rise shall be as per relevant

standard.

16.0 TYPE TESTS

16.1 Type test certificates for the following tests, as per IS:13118 or IEC 62271-100 with latest

amendment thereof, from any of the NABL accredited Laboratory shall invariably be furnished

a. Short circuit duties test b. Short time withstand current and peak withstand current tests c. Temperature rise test d. Mechanical endurance test e. Lightning impulse voltage withstand test f. Power Frequency withstand voltage test (dry & wet) g. Single Capacitor bank switching test h. Degree of protection IP-55 as per IS:13947:93(Part-I)/IEC 60529:89

42

16.2 Type test certificates must accompany drawing of type tested equipment, duly sealed &

signed by type testing authority.

16.3 Type tests should not have been conducted on the equipment earlier than 3 years from the

date of opening of bids.

16.4 In case of any change in design/type of breaker already type tested and the one being offered

against this specification, the Employer reserves the right to demand repetition of some or all

tests without any extra-cost at NABL accredited lab.

17.0 ACCEPTANCE AND ROUTINE TEST :-

17.1 Employer shall have access at all times to the works and all other places of manufacture where

the Circuit Breakers are being manufactured and the Bidder shall provide all facilities for

unrestricted inspection of the Bidder/manufacturer’s works, raw materials, manufacture of all

the accessories and for conducting necessary tests as detailed herein. The Employer

reserves the right to insist for witnessing acceptance/routine testing of the bought out items.

The Bidder/manufacturer shall submit the routine test certificates of bought out items and raw

material also, at the time of routine testing of the fully assembled breaker

17.2 No material shall be dispatched from its point of manufacture unless the material has been

satisfactorily inspected and tested.

17.3 Bidders shall indicate the inspections and checks carried out at various stages of manufacture

of the circuit breakers. Complete record of stage inspection would be kept by the

Bidder/manufacturer and this record should be made available for inspection by the

representative of the Employer. Bidder/manufacturer should indicate the manufacturing

programme and the The Employer will have a right to depute inspecting officers during the

manufacture of the equipment. The Employer reserves the right to carry out stage inspections

at all stages, for which advance intimation shall be given and all necessary cooperation shall

be rendered by the manufacturer.

17.4 At the time of inspection, Bidder/manufacturer shall identify each and every item/accessories of

the particular Circuit Breaker under testing. Unless all the items are identified, the

manufacture will not be treated as complete. Various tests stipulated in IS/IEC shall be

performed in the presence of the Employer’s engineers or when the inspection waiver has

been given, in such a case, testing shall be done at the manufacturer's works as per IS/IEC

stipulations and same should be confirmed by documentary evidence by way of Test

Certificate which shall be got approved by the Employer.

17.5 It is expected that before circuit breaker is finally offered for inspection, internal testing of the

same for various important parameters are already done. Routine test report for such tests

shall also accompany the letter of inspection call so that the Inspecting Officer at the time of

inspection may verify the parameters brought out in the preliminary report. Details of all tests

should be clearly brought out.

17.6 In case for any reason, inspection is not completed or equipment is not found to be complete

with all accessories as per confirmation given with the letter of inspection call, the Employer

will reserve the right to recover complete cost of deputation of inspecting team to the works of

the manufacturer.

17.7 Acceptance of any quantity of circuit breaker & its accessories shall in no way relieve the

successful bidder of his responsibility for meeting all the requirement of this specification and

shall not prevent subsequent rejection if such equipments are later found to be defective.

18 RATING PLATES & SURFACE FINISH PAINTING & GALVANISING:-

18. 1 Each circuit breaker shall be provided with a detailed rating plate. Details on the rating plate

shall be as per ISS and shall also indicate manufacturer name, serial no., order no. and

month & year of dispatch.

18.2 All interiors and exteriors of tanks, mechanism, enclosures, cabinets and other metal parts

shall be thoroughly cleaned to remove all rust, scales, corrosion, greases or other adhering

foreign matter. All steel surfaces in contact with insulating oil, as far as accessible, shall be

painted with not less than two coats of heat resistant, oil insoluble, insulating paint.

43

18.3 All metal surfaces exposed to atmosphere shall be given two primer coats of zinc chromate and

two coats of epoxy paint with epoxy base thinner or hot dip galvanized or two packs of

aliphatic polyurethane finished paint. All metal parts not accessible for painting shall be made

of corrosion resistant material. All machine finished or bright surfaces shall be coated with a

suitable preventive compound and suitably wrapped or otherwise protected. Paints shall be

carefully selected to withstand tropical heat and extremes of weather within the limits

specified.

18.4 Paint shall not scale off or wrinkle or be removed by abrasion due to normal handling. All

external paintings shall be as per shade no. 697 or any other suitable shade of IS:5 or

polyurethane paint

18.5 All ferrous parts & steel structure including all sizes of nuts, bolts, plain and spring washers,

support channels, structures, etc. shall be hot dip galvanized or stainless steel or electro-

galvanized.

19.0 DOCUMENTATION:

19.1 List of Drawings and Documents: Bidders shall furnish four sets of relevant descriptive and

illustrative published literature, pamphlets and following drawings for preliminary study:

(a) General outline drawings showing dimensions and shipping weights. (b) Sectional views showing the general constructional features of the circuit breaker including operating mechanism, arcing chambers, contacts with lifting dimensions for maintenance. (c) All drawings & data typical and recommended schematic diagram for control supervision & reclosing shall be annotated in English. . (d) Schematic diagrams of breaker offered for control supervision and reclosing. (e) Structural drawing, design calculations and loading data for support structures. (f) Short circuit oscillogram & certificates for similar type tested breakers. General arrangement of foundation and structure mounting plan including weights of varnish components and impact loading data for foundation design. (g) Type test reports.

19.2 Successful bidders shall, within two weeks of placement of order, submit four sets of final

version of all the above drawings for the Employer's approval. The Employer shall

communicate his comments/approval on the drawings to the Bidder/manufacturer within two

weeks. Bidder/manufacturer shall, if necessary, modify the drawings and resubmit four copies

of the modified drawings for the Employer's approval within two weeks from the date of

comments. After receipt of the Employer's approval, the Bidder/manufacturer shall, within

three weeks, submit 4 prints per breaker and two set of good qualities reproducible of the

approved drawings for the Employer's use.

19.3 Successful bidders shall also furnish two sets each of bound manuals covering erection,

commissioning, operation and maintenance instructions and all relevant information and

drawings pertaining to the main equipment as well as auxiliary devices along with each

breaker. Marked erection drawings shall identify the component parts of the equipment as

shipped to enable erection by the Employer’s own personnel. Each manual shall also contain

one set of all the approved drawings, type test reports as well as acceptance reports of the

corresponding consignment dispatched.

19.4 Manufacturing of equipments shall be strictly in accordance with the approved drawings and no

deviation shall be permitted without the written approval of the Employer.

19.5 Approval of drawings/work by the Employer shall not relieve the bidders of any of his

responsibility and liability for ensuring correctness and correct interpretation of the drawings

for meeting the requirements of the latest revision of the applicable standards rules and codes

of practices. Equipment shall conform in all respects to high standards of engineering, design,

workmanship and latest revisions of relevant standards at the time of supply and the

Employer reserves the right to reject any equipment or material which, in his judgment, is not

in full accordance therewith.

44

20.0 PACKING AND FORWARDING:

20.1 Equipment shall be prepared for ocean shipment (foreign equipment) or rail road transport (local

equipment). Equipment shall be packed in suitable crates in such a manner to protect it from

damage and withstand handling during transit. Bidder/manufacturer shall be responsible for

and make good at his own expense any or all damage to the equipment during transit, due to

improper and inadequate packing and handling. Easily damageable materials shall be

carefully packed and marked with the appropriate caution symbols. Wherever necessary,

proper arrangement for lifting such as lifting hooks etc. shall be provided. Any material found

short inside the packing cases shall be supplied by the Bidder/manufacturer without any extra

cost. Each consignment shall be accompanied by a detailed packing list containing the

following information:

(a) Name of the consignee. (b) Details of consignment. (c) Destination. (d) Total weight of consignment. (e) Sign showing upper/lower side of the crate. (f) Handling and unpacking instructions. (g) Bill of material indicating contents of each package and spare material.

21.0 COMPLETENESS OF EQUIPMENT AND BOUGHT OUT ITEMS:

21.1 Bidders must furnish following information along with technical bid. A list of all the accessories

which will be supplied with the breakers should be furnished. While furnishing the list of

accessories, items which will be manufactured by the Bidders and balance items, which will

be procured from sub-Bidder/manufacturers should be clearly identified and stipulated in the

bid.

22.0 GUARANTEE

The successful Bidder shall guarantee among other things the following:

a) Quantity and strength of material used

b) Safe electrical and mechanical stresses on all parts of the equipment, under specified conditions of operation

c) The material shall be guaranteed for satisfactory performance, operation for a period of five year (60 months) from the date of commissioning.

d) If during the period of guarantee, any of the material, equipments or plant are found defective and/or fail in test or operation, such materials, equipment or plant shall be repaired by the Bidder free of cost to the Purchaser irrespective of the reimbursements from the insurance company within reasonable time which shall in no circumstances be more than 15 days or such other reasonable time as the Purchaser may deem proper to afford failing which the cost of the failed units will be deducted from the subsequent bills

23.0 GUARANTEED TECHNICAL PARTICULARS:

23.1 It is obligatory on the part of bidders to furnish Guaranteed Technical Particulars enclosed with

the bid document duly filled in complete in all respects. In case Guaranteed Technical

Particulars duly filled in complete in all respects is not furnished, the bid may be treated as

non-responsive.

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7.3 TECHNICAL SPECIFICATION FOR 11kV INDOOR VCB PANEL

1.0 SCOPE 1.1 This specification covers the manufacture, testing at manufactures works, transport to site,

insurance, storage, erection and commissioning of indoor 11 KV ,9 unit Panel switch boards which includes 11KV circuit breakers with current transformers, voltage transformers, protective devices, protective relays measuring instruments and meter etc. and wired complete with all accessories as specified.

1.2 It may be noted that the 11 KV Indoor Vacuum Switchgear must meet the following minimum

criteria. Failure to comply with the requirements may results in rejection of the BID as non-

responsive:

1.2.1 The Manufacturer must have designed, manufactured, type tested and supplied 11 KV

Indoor Vacuum Switchgear in at least two power utilities of similar rating which are in

successful operation for at least 5 (Five) years as on the date of bid opening. Which

should be substantiated by furnishing performance report by the official of the rank of

minimum DGM/SE

1.2.2 The manufacturer of the VCB must use their own make Vacuum Interrupter and must

have in-house manufacturing facility for Vacuum Interrupter & Breaker (including

mechanism)

1.2.3 Internal Arc Proof Panel – 25 kA for 0.1 sec with explosion vents on each HT

Compartment.

2.0 STANDARD 2.1 Latest issues of the following standards shall be applicable.

I.S. 13118 Circuit Breakers I.S. 2705 Current transformers I.S. 3156 Voltage transformers I.S. 2099 Porcelain Bushing, High Voltage I.S. 335 Insulating oil I.S. 1554 Cables I.S. 3231 Electrical relays for power system protection I.S. 1248 Electrical indicating instruments.

3.0 DRAWINGS, MANUALS, LITERATURES ETC.

3.1 The successful tenderer shall be required to submit to the purchaser for his approval five copies of drawings and other details which include bue not limited to the following:- a) General out line drawings with full dimensions.

b) Detailed drawings showing the mounting arrangement of the switchboards, provisions

for cable entries etc.

c) Detailed drawings showing the provisions kept for extension of the switchboards

d) List of all component parts, fittings and accessories of the switchboards with maker’s

name, type, ratings etc

e) A.C. and D.C. schematic and wiring diagrams

f) After approval of drawings the tender shall submit to the purchaser for the reference

and record five copies of the above drawings including the following leaflets /

manuals (in sic copies):

g) Instruction books / operation and maintenance manuals for circuit breaker and other

component parts.

h) Descriptive literature/leaflets on construction and other details of circuit breakers and

other component parts.

3.2 In addition to the above successful tenderer shall supply three sets of all the above final drawings, literatures, manuals etc under a common cover with each and every sets of switchboard. All the above drawings, literatures, manuals etc. shall from a part of the contract.

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4.0 TECHNICAL SPECIFICATION: 4.1 The switchboard shall be metal enclosed, floor mounting, single front self supporting cubical type

suitable for indoor. The switchgear shall be easily extendable in future. 4.2 The switchgear assembly shall be designed for the power system having the following parameters. a). Nominal system voltage: 11KV b). Highest system voltage: 12KV c). Frequency: 50 Hz. d). System earthing: Solidly earthed neutral e). System fault level: 250 MVA f). Degree of protection of switchgear assembly: 1PH3 as per IS: 3427 5.0 CONSTRUCTIONAL FEATURES: 5.1 The 11 KV switchgear panels shall be made of stretched leveled steel plates of thickness not

less than 3 mm and structural steel having light sections. 5.2 The steel panel and frame work shall have rigorous surface treatment before application of

suitable primer and two coats of paints, painting shall be a anti-corrosive and anti-condensive type.

5.3 Each panel shall be divided into independent compartment completely isolated from one another to house the circuit breaker, instruments, relay, bus bar, cable boxes etc. The front compartment housing the breaker shall be such that the breaker can be taken out only when it is in open condition.

5.4 The switchgear boards shall have a single front, single tier, fully compartmentalized, metal enclosed construction, comprising of row of freestanding floor mounted panels. Each circuit shall have a separate vertical panel with distinct compartments for circuit breaker ,cable termination, main busbar and auxiliary control devices. The adjacent panels shall be completely separated by steel sheets except in busbar compartments where insulated barriers shall be provided to segregate adjacent panels. However, manufacturer’s standard switchgear design without internal barriers in busbar compartment may also be considered.

5.5 The circuit breakers and bus PTs shall be mounted on withdrawable trucks, which shall roll out horizontally from service position to isolated position. The breaker truck shall be floor mounted so that it can easily be pulled out on the control room floor and the help of trolly etc. are not to be utilized.

5.6 The switchgear assembly shall be dust, moisture, rodent and vermin proof, with the truck in any position SERVICE, ISOLATED, TEST or removed, and all doors and covers closed. All doors, removable covers and glass windows shall be gasketted all round with synthetic rubber or neoprene gaskets.

5.7 The bus VT/relay compartments shall have degree of protection not less than IP : 52 in accordance with IS:2147. However, remaining compartments can have a degree of protection of IP:42. All louvers if provided shall have very fine brass or GI mesh screen, IPH-2 degree of protection as per IS: 3427 to all live parts shall (whether isolated or removed from panel) even when the breaker compartment door is open. Tight fitting garments / gaskets are to be provided at all openings in rely compartment.

5.8 Circuit breaker shall be vacuum; draw out type housed in a separate cubicle of the switchboard and shall be enclosed from all sides. A sheet steel hinged lockable door shall be at the front. It shall be possible to withdraw the circuit breaker to ‘Test’ and “Isolated’ position with the door closed. Door interlock shall be provided such that the door can only be opened after withdrawing the breaker to ‘Isolated’ position and the breaker cannot be racked into the ‘Service’ position unless the door is closed. A visual indication as to show when the breaker is in ‘Service’, ‘Test’ of ‘Isolated’ position shall be provided in front of the door.

5.9 The switchgear shall be cooled by natural airflow and cooling by any other method shall not be accepted.

5.10 Total height of the switchgear panels shall not exceed 2600 mm. The height of switches, pushbuttons and other hand-operated devices shall not exceed 1800 mm and shall not be less than 700mm.

5.11 Switchgear construction shall have a bushing or other sealing arrangement between the circuit breaker compartment and the busbar / cable compartments, so that there is no air communication around the isolating contacts in the shutter area with the truck in service position.

5.12 The breaker and the auxiliary compartments provided on the front side shall have strong hinged doors, busbar and cabling compartments provided on the rear side have bolted compartment covers with self retaining bolts. Breaker compartment doors shall have locking facility.

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5.13 In the service position, the truck shall be so secured that it is not displaced by short circuit. Busbars, jumpers and other components of the switchgear shall also be properly supported to withstand all possible short circuit forces corresponding to the short circuit rating specified.

5.14 Suitable base frames made out of steel channels shall be supplied along with necessary anchor bolts and other hardware, for mounting of the switchgear panels. These shall be dispatched in advance so that they may be installed and leveled when the flooring is being done, welding of base frame to the insert plates as per approval installation drawings.

5.15 The switchboard shall have the facility of extension on the both sides Adopter panels and dummy panels required to meet the various busbar

6.0 CIRCUIT BREAKER RATING 6.1 FOR INCOMER(2 Nos.) 6.2 FOR BUS COUPLER(1 No.) 6.3 FOR OUTGOING FEEDER (6 Nos.)

7.0 CURRENT TRANSFORMER RATING 7.1 FOR TRANSFORMER INCOMING (i) Accuracy class : a) Core -I : 0.5 with ISF less than 5 b) Core –II : 5 P with ALF 10 c) Core –III : PS (for 3 core CT only) (ii) Rated Burden a) Core –I : 30 VA b) Core –II : 15 VA (iii) Knee point voltage : 100 volts (for core –III ) (iv) Ratio: : 600-300-150/5-5-2.89 7.2 Current Transformers for outgoing (feeders) (i) Ratio : 200-100/5-5 (ii) Accuracy class : a) Core -I : 0.5 with ISF less than 5 b) Core –II : 5 P with ALF 10 (iii) Rated Burden : a) Core –I :30 VA b) Core –I : 15 VA 7.3 Current Transformers for Bus Section (i) Ratio : a) 600-300/5-5 (ii) Accuracy class : a) Core -I : 0.5 with ISF less than 5 b) Core –II : 5 P with ALF 10 (iii) Rated Burden : a) Core –I : 15 VA b) Core –I : 15 VA 8.0 POTENTIAL TRANSFORMERS

8.1 The tenderer shall quote for oil immersed or cast-resin type having the following particulars for the purpose of metering:

1. Rated voltage ratio : 11000/110 2. No. of phases : 3 Phases / star - star connected 3. Rated Burden : 100 VA per phase 4. Class of accuracy : 0.5 5 Primary wiring of the PTs shall be protected by suitable H.R.C. fuse. 8.2 Two sets of 11 KV/110 V PTs shall be provided 9.0 PROTECTIVE RELAYS: 9.1 All the incoming and outgoing switchgear units shall be provided protective relays to disconnect

the faulty circuits with speed and certainty without interfering with healthy circuits. 9.2 The protective relays mounted on the panels shall be of the draw out type. The relavs must be

capable of resetting without necessity of opening the case. The relays shall be provided with flag indicates to enable the type of fault conditions to be identified.

9.3 Incoming and outing feeders units and the bus coupler panel shall be provided with combined over current and earth fault relay with current range of 50-200% for O/C with inverse characteristics and 20-80% for E/F relay of time range 0.3 secs at 10 times current.

10.0 MEASURING INSTRUMENTS 10.1 All instruments shall be switchboard type, back connected, suitable for flush mounting and shall

comply with the requirements of latent issues of relevant Indian Standards. The instrument cases shall be dust proof, water tight, vermin proof and specially constructed to adequately

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protect the instruments against damage or deterioration due to high ambient temperature and humidity.

10.2 All instruments shall be access adjustable and calibrated before dispatch and shall have means for calibration check and adjustment at site.

10.3 All ammeters shall be digital type with direct reading scales. The scale value of ammeters shall be as per the primary current ratings of the associated current transformers. The rated current of ammeter elements shall be 5 ampere and accuracy class 1.0 as per IS: 1248.

10.4 All voltmeters shall be of digital type with direct reading scales. The maximum scale value of voltmeters shall be 50% in access of the primary voltage of associated PT. The rated voltage of the voltmeters shall be 110 volts A.C. and accuracy class shall be 1.0 as per IS: 1248.

10.5 Indicating wattmeters shall be of digital type of accuracy class 1. 10.6 Energy meters shall be digital type of accuracy class 0.5 and of Secure make or L&T

make preferably as per APDCL Spec or equivalent specification. 11.0 SMALL WIRING AND TERMINAL BLOCKS 11.1 All panels shall be furnished completely factory wired up to terminal blocks ready for external

connections. All wiring shall be switchboards type, with annealed copper wires with PVC insulation for 1100 volts complying with requirements of latest issue of IS: 1554 (Part-I) or equivalent international specifications. The sizes of the wiring for different circuits shall be go chosen as to provide ample margin for the purposes intended and shall be subjected to approval of the purchaser. However minimum cross section of wires to be used shall not be less than 1.5. sq.m. All the operating coils and small wires shall withstand a power frequency ten voltage of 2 KV for one minute.

12.0 SAFETY EARTHING 12.1 Earthing of current free metallic parts of metallic bodies of the equipment on the panel and the

switchboards shall be done with soft drawn single conductor bare cooper. A copper ground bus extending the entire length of the panels shall be provided. Suitable clamp type terminals shall be provided for connecting both ends of the bus to the station earth system. The earth connection of instrument transformers wherever necessary shall be connected with the main earth wire of the panel earthing system. Multilpe earthing of any instrument transformer circuit shall be avoided.

13.0 CABLE BOXES AND CABLE GLANDS: 13.1 Cable boxes with cable glands shall be supplied with each of the panel. It should be of

adequate dimension for terminals of 11 KV cables of sizes 300 and 185 sqmm and 180 sq.mm. 13.2 The 11 KV cable boxes shall preferably be located at the back of the switchboards and shall be

suitably mounted for cables rising from cable trenches running at floor of the control room. The cable glands provided at the entrance shall facility for earthing of amounting.

13.3 All control/Wire entries should be by means of suitable cable glands such glands should be of brass and tinned.

14.0 DETAILS OF FITTING AND ACCESSORIES 14.1 The 11 KV switchboards shall consist of the following equipments :

11 KV Indoor switchgear shall be 9 unit Panel:

a) Incomer 2 Unit

b) Bus coupler 1 unit

c) Outgoing 3x2= 6 unit

Bus bar rating shall be 1600 A continuous, with current density 0.9A/mm² for Al.

CT ratio:

a) Incomer 300-600/5-5-5A

b) Outgoing 200-100/5-5A

c) Bus coupler 300-600/5-5A

Breaker rating shall be 800A for incomer, bus coupler and outgoing feeders and shall be

interchangeable.

Breaker shall be M2 class.

CB contact design shall have Butt contacts and transfer contacts shall be Multilam type.

The Bus bar shall be insulated.

S.C. capacity shall be 25 KA.

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Earthing conductor shall not be more than 30 mm² for copper , Al.100 mm².

The bus support insulators shall be 17 KV grade and creepage distance shall not be less than

250 mm.

The IP protection shall not be less than IP43.

CTs shall be ring type for incomer, bus coupler and outgoings.

PT shall be single phase with minimum 100 VA.

Differential and B/U relay shall be Numeric with IEC 61850 compatible, as most of the reputed

manufacturer has started to stop manufacturing relays without IEC 61850. Further, this will

help for Distribution SCADA.

Motors shall be AC/DC operated.

Switchgear colour shall be RAL 7035.

Switchgear panel shall be forced air ventilated for better insulation and de-humidification.

All energy meters shall be Flush mounted, MW meters shall be digital, other indicating meters

like Ammeter, Voltmeter may be Analogue type.

Breaker shall be draw out type and placed at some height above floor level by using trolley.

Bus bar shutters shall be preferably metallic and earthed.

There should be provision of extension for anither two units.

14.2 Incoming panel (Transformer panel) I. Circuit Breaker:

1 No. : - Triple pole circuit breaker. With continuous current rating of 800A. :Manually, charged independent spring closing, mechanism fitted with mechanical “ON” and “OFF” indications.

1 No. : Hand trip device.

1 No. : Shunt trip coil suitable for 110 D.C.

II. Meters and Instrument:

1 No. : Ammeter with selector switch. 1 No. : Voltmeter with selector switch. 1 No. : Electronic Tri-vector Meter 1 No. : Test terminal block for meters.

III. Relays: 1 Set : Over current and earth fault relay. 1 Set : Testing links and terminals for relays.

Indication

2 No. : Indicating lamps for indication of ‘ON’ and ‘OFF’ position of breaker.

1 No. : Indicating lamp labeled “trip Circuit healthy” with push button.

IV. Annunciation:

Annunciation : No annunciation facia shall be provided for Outgoing panel

V. Other Equipments and fitting: Same as for incoming panel but cable box shall be suitable for following size of cable: 1 No. : 3 core 11 KV cable of size up to 630 sq.mm.

14.3 BUS SECTION PANEL:

Same as detailed for incoming panel in clause 14.2 but with following modifications/additions/deletions:

I. Circuit Breaker: 800 A

II. Current and potential transformer

NO Potential transformer required, CT ratio as specified for bus section panel.

III. Meters and Instruments:

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All meters except the ammeter with selection switch shall be deleted.

IV. Relays:

Only 1set O/C & E/F relay shall be provided.

V. Indication:

Indicating lamp labeled “Auto trip” with accept push button associated with Auto trip alarm shall be added.

VI. Annunciation:

No annunciation facia shall be provided for bus section panel.

VII. Other Equipments and Fittings:

Cable box shall be deleted.

14.4 COMMON ALARM AND ANNUNCIATION: I. Each switchboard shall be provided with a suitable common alam system for:

a). D.C. Power supply failure. b). A.C. Power supply failure. c). Auto trip alarm.

II. An AC operated relay with AC buzzer and AC indicating lamp shall be provided for annunciation of DC failure. III. A DC operated relay with DC buzzer and DC lamp shall be provided for AC failure. IV. Alarm and annunciation scheme shall be provided completed with horns, buzzers,

relays, alarm connection push buttons, alarm test push buttons etc.

15.0 CIRCUIT LABELING: 15.1 Each switchgear shall be appropriately such as ‘INCOMING TRANSFORMER’, OUTGOING –

FEEDER and BUS – SECTION’, Associated Circuit breaker ratings, CT & PT ratio and any other information, manufacturer feels necessary shall also be included in the label.

16.0 PERFORMANCE GUARANTEE

16.1 The bidder shall offer equipment performance guarantee for a minimum period of 1 year from the date of commissioning.

. 17.0 SPECIAL TECHNICAL SPECIFICATIONS OF SWITCHGEAR:

17.1 Switchgear shall be installed on finished surfaces, concrete or steel sills. Contractor shall be required to install and align any channels sills, which form part of foundations. Circuit breaker trolley wheels shall move on channels, which shall form part of floor. The channel length shall be minimum of 1-meter form the door of switchgear panel. Power bus enclosure, ground and control splices of conventional nature shall be cleaned and bolted together with torque wrench of proper size or by other approved means. Tape or compound shall be spilled where called for in drawing Contractor shall take utmost care in handling instruments, relays and other delicate mechanism. Wherever the instruments and relays are supplied loose along with switchgear, they shall be mounted only after the associated switchgear panels have been erected and aligned. The blocking materials, employed for safe transit of instrument and relays shall be removed after ensuring that panels have been completely installed and no further movement of the same would be necessary. Any damage shall be immediately reported to Engineer.

17.2 Foundation work for all switchgear panels will be carried out by contractor. For R&M of existing substation foundation work shall be done wherever required as per site condition.

17.3 Circuit breaker may be provided with inter pole barriers of insulting materials, if the same is standard design of the manufacture. But use of inflammable materials like Hylam shall not be acceptable.

17.4 The control switch located on the switchgear would normally be used for operation of circuit breaker in service/isolated position, and for tripping it in an emergency.

17.5 Facilities shall be provided for mechanical tripping of the breaker. 17.6 Auxiliary contacts of breaker may be mounted in the fixed portion or in withdraw able truck as

per the standard practice of the manufacture, and shall be directly operated by the breaker operating mechanism.

17.7 Auxiliary contacts mounted in the portion shall not be operable by the operating mechanism, once the truck is withdrawn from the service position, but remain in the position corresponding to breaker open position. Auxiliary contacts mounted on the truck portion and dedicated for

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use shall be wired out in series with a contact denoting breakers service position. With truck withdrawn, the auxiliary contacts shall be operable by hand for testing.

17.8 For Employer’s use six (6) normally opened (NO) and six (6) normally closed (NC) auxiliary contacts shall be wired out to the terminal blocks. Contact multiplication, if necessary to meet the above contact requirement, shall be done through suitable latch relay of English Electric type VAJC-11 or equivalent.

17.9 It shall be possible to easily insert breaker contractor of one feeder into any one of the panel meant for same rating but at the same time shall be prevented from inserting it into panels meant for a different type of rating.

17.10 All bus bar and jumper corrections shall be of high conductivity copper or aluminium alloy. They shall be adequately supported on insulators to withstand electrical and mechanical stresses due to specified short circuit currents.

17.11 Busbar joints shall be bolted type. 17.12 Busbar cross-section shall be uniform throughout the length of switchgear. Busbar and other

high voltage connection shall be sufficiently corona free at maximum working voltage. 17.13 Contact surfaces at all joints shall be silver plated or properly cleaned and no oxide grease

applied to ensure an efficient and trouble free connection. All bolted joints shall have necessary plain and spring washers. All connection hardware shall have high corrosion resistance. Suitable bimetallic connectors shall be used for aluminium to copper connections.

17.14 Busbar insulators shall be of arc and track resistant high strength, non-hygroscopic, non-combustible type and shall be suitable to withstand stresses due to over-voltages, and short circuit current. Busbar shall be supported on the insulators such that the conductor expansion and contraction are allowed without straining the insulators. In case of organic insulator partial discharge shall be limited to 100 pico coulomb at rated voltage x1.1/ 3. Use of insulators and barriers of inflammable material such as Hylem shall not be accepted.

17.15 All busbur shall be colour coded .17.16 The temperature of the busbars and all other equipment, when carrying the rated current

continuously shall be limited as per the stipulations of relevant India Standards, duly considering the specified ambient temperature (50 deg. C). The temperature rise of the horizontal and vertical busbars when carrying the rated current shall be in no case exceed 55 deg.C for silver plated joints and 35 deg.C for all other type of joints. The temperature rise at the switchgear terminals intended for external cable termination shall not exceed 35 deg.C. Further the switchgear parts handled by the operator shall not exceed a rise of 5deg.C.

18.0 PAINTING:

18.1 Al sheet steel work shall be pretreated in tanks in accordance with IS: 6005 or equivalent international specifications. Degreasing shall be done by alkaline cleaning. Rust and scale shall be removed by pickling with acid. After pickling, the parts shall be washed in running water. Then these shall be rinsed in slightly alkaline hot water and dried. The phosphated coating shall be Class ‘C’ as specified in IS: 6008. The phosphated surface shall the rinsed and passivated prior to application of stoved lead oxide primer coating. After primer application, two coats of finishing synthetic enamel paint on panels shall be applied. Finishing paint on panels shall be shade 692 (smoke grey) of IS: 5 unless specified otherwise by the Owner. The inside of the panels shall preferably be glossily white. Each coat finishing shall be properly stoved. The paint thickness shall not be less than 50 microns. Finished surfaces from scratches, grease dirt’s and oily spots during testing, transporation, handling and erection.

19.0 SWITCHGEAR WIRING

19.1 All switchgear panels shall be supplied completely wired internally upto the terminal block ready to receive external cabing. All inter cubicle wiring and connections between panels of same switchboard including all bus wiring for AC and DC supplies shall be provided by the Contractor.

All internal wiring shall be carried out 650 grade, single core, 1.5 sq.mm, stranded copper wires having minimum of seven strands per conductor and colour coded, PVC insulation. CT circuits shall be wired with 2.5 sq.mm. wires which otherwise are similar to the above. Extra flexible wires shall be used for wiring between fixed and moving parts such as hinged doors.

All wiring shall be properly supported neatly, readily accessible and securely connected to equipment, terminals and termenal blocks. Wiring troughs or gutters be used for this purpose.

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19.2 Internal wire terminals shall be made with solder less crimping type tinned copper lugs, which shall firmly grip the conductor. Insulation sleeves shall be provided over the exposed parts of lugs. The lugs related to CT secondary circuit wiring shall be hole type.

19.3 Engraved core identification plastic ferrules marked to correspond with panel wiring diagrams be fitted at both ends of each wire number 6 and 9 shall not be used for wire identification. Ferrules shall fit tightly on wires and shall not fall off when wire is, disconnected from terminal. All wires directly connected to trip the circuit breaker shall be distinguished by the addition of a red coloured unlettered ferrule.

19.4 Inter connection to adjacent panels shall be brought out to a separate set of terminal blocks located near the slots or holes, meant for the interconnecting wires. Arrangement shall permit neat layout and easy inter connections to adjacent panels at site and wires for this purpose shall be provided by Contractor looped and bunched properly inside the panels. The inter panel wires shall be cross ferruled i.e. it shall have details of emanating terminal and also where it is terminated.

19.5 Manufacturer shall be fully responsible for the completeness and correctness of the internal wiring and for the proper functioning of the connected equipment.

19.6 The Manufacturer shall provided the necessary clamps wiring troughs etc. for all wiring in side the switchgear enclosed including the power and control cables.

20.0 POWER CABLE TERMINATION:

20.1 The cable termination compartment shall received the stranded aluminium conductor, XLPE insulated, shielded, armoured / unarmoured, PVC jacketed, single core / three core unearthed / earthed grade power cable (s).

20.2 A minimum clearance of about 600 mm shall be kept between the cable lug bottom ends and gland plates for stress cone formation for XLPE Cable. Interphase clearance in the cable termination compartment shall be adequate to meet electrical and mechanical requirement besides facilitating easy connections and disconnections of cables. Dimensional drawing of cable connected compartment showing the location of lug, glands, CTS, gland plates etc. and the electrical clearances available shall be submitted Employer approval during detailed engineering.

20.3 Cable termination compartment shall be complete with power terminals, power lugs and associated hardware and removable undrilled gland plates. Fopr all single core cables grand plates shall be of nonmagnetic material.

20.4 Supply of the cable termination kit and cable termination shall be in scope of contractor.

21.0 TESTS: 21.1 The Contractor shall submit the type test reports of following type tests for approval of the

Employer for circuit breaker, circuit breaker panels, of each voltage class and current rating: i). Short circuit duty test on circuit breaker, mounted inside the panel offered along

with CTs, bushing and separator.

ii). Short time withstand test – on circuit breaker, mount inside panel offered together with CTs, bushing and separator.

iii). Power frequency withstand test on breaker and panel.

iv). Lighting impulse withstand test on breaker and panel.

v)The indoor VCB switchgear should have internal arc test conducted at CPRI or equivalent facility.

21.2 Temperature rise test on breaker and panel together. For this test, the test set up shall include three panels with breakers, the test breaker and panel being placed in the center. The adjacent panels shall also be loaded to their current capacity. Alternatively the test panel may be suitably insulated at the sides, which will be adjoining to other panels in actual site configuration.

21.3 Switching over-voltage test as per clause 3.2(b) on each rating of breaker.

a) Measurement of resistance of main circuit.

b) Mechanical eduranc4e test on breaker.

c) Mechanical operation test.

d) Short circuit withstand test of earthing device (Truck / Switch).

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21.4 For all the important components like instrument transformers, relays, instruments, switches, bushing, wires, insulators, timers, annunciation, terminal blocks and fuses etc. the contractor shall furnish satisfactory type test reports for Employer’s approval. Such reports cover all applicable type test listed in relevant Indian Standards, for all components of type and rating being supplied.

22.0 COMMISSIONING CHECKS / TESTS 22.1 After installation of panels, power and control wiring and connect contractor shall perform

commissioning checks as listed below to proper operation of switchgear / panels and correctness of all respects.

22.2 GENERAL a) Check name plate details according to specification.

b) Check for physical damage. c) Check tightens of all bolts, clamps and connecting terminal. d) Check earth connections. e) Check cleanliness of insulators and bushings. f) Check heaters are provided. g) H.V. test on complete switchboard with CT & breaker / contractor lubricated in position. h) Check all moving parts are properly lubricated. i) Check all alignment of bus bars with the insulators to ensure alignment and fitness of insulators. j) Check for inter changeability of breakers. k) Check continuity and IR value of space heater. l) Check earth continuity of the complete switchgear board.

22.3 CIRCUIT BREAKER a) Check alignment of trucks for free movement . b) Check correct operation of shutters. c) Check show closing operation (if provided). d) Check control wiring for correctness of corrections, continuity and IR values. e) Manual operation of breakers completely assembled. f) Power closing / opening operation manually and electrically at extreme condition of control

supply voltage. g) Closing and tripping time. h) Trip free and anti-pumping operation. i) IR values, resistance and minimum pick up voltage of coils. j) Simultaneous closing of all the three phases. k) Check electrical and mechanical inter locks provided. l) Checks on spring charging motor, correct operation of limit switches and time of charging. m) Check vacuum (as applicable).

n) All functional checks.

23.0 The successful Bidder shall guarantee among other things the following: a) Quantity and strength of material used b) Safe electrical and mechanical stresses on all parts of the equipment, under specified

conditions of operation c) The material shall be guaranteed for satisfactory performance, operation for a period of

five year (60 months) from the date of commissioning. d) If during the period of guarantee, any of the material, equipments or plant are found

defective and/or fail in test or operation, such materials, equipment or plant shall be repaired by the Bidder free of cost to the Purchaser irrespective of the reimbursements from the insurance company within reasonable time which shall in no circumstances be more than 15 days or such other reasonable time as the Purchaser may deem proper to afford failing which the cost of the failed units will be deducted from the subsequent bills,

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7.4 TECHNICAL SPECIFICATION OF OUTDOOR CURRENT AND POTENTIAL TRANSFORMERS

1.0 SCOPE OF CONTRACT

1.1 This Section of the Specification covers general requirements for design, engineering, manufacture, assembly and testing at manufacturer’s works of 33kV and 11 kV outdoor Current and Potential Transformers.

2.0 STANDARDS

2.1 The equipment covered by this specification shall, unless otherwise stated be designed, constructed and tested in accordance with the latest revisions of relevant Indian Standards and shall conform to the regulations of local statutory authorities.

2.2 In case of any conflict between the Standards and this specification, this specification shall govern.

2.3 The current transformer shall comply also with the latest issue of the following Indian standard.

(i) IS: 2705(Part-I) Current transformers: General requirement. (ii) IS: 2705(Part-II) Current transformers : Measuring Current transformers (iii) IS: 2705(Part-III) Current transformers : Protective Current transformers (iv) IS: 2705(Part-IV) Current transformers: Protective Current transformers for

special purpose application. (v) IS: 3156(Part-I) Potential transformers: General requirement. (vi) IS: 3156 (Part-II) Potential transformers : Measuring Potential transformers (vii) IS: 3156 (Part-III) Potential transformers : Protective Potential transformers

3.0 GENERAL REQUIREMENTS 3.1 The cores of the instrument transformers shall be of high grade, non-aging CRGO steel of low

hysteresis loss and high permeability. 3.2 Instrument transformers shall be of Dead Tank design or Live Tank design. 3.3 The instrument transformers shall be truly hermetically sealed POLYCRETE Type 3.4 A complete leak proof secondary terminal arrangement shall be provided with each instrument

transformers, secondary terminal shall be brought into weather, dust and vermin proof terminal box. Secondary terminal boxes shall be provided with facilities for easy earthing, shorting, insulating and testing of secondary circuits. The terminal boxes shall be suitable for connection of control cable gland.

3.5 All instrument transformers shall be of single phase unit. 3.6 The instrument transformers shall be so designed to withstand the effects of temperature, wind

load, short circuit conditions and other adverse conditions. 3.7 All similar parts, particularly removable ones, shall be interchangeable with one another. 3.8 All cable ferrules, lugs, tags, etc. required for identification and cabling shall be supplied

complete for speedy erection and commissioning as per approved schematics. 3.9 The instrument transformers shall be designed to ensure that condensation of moisture is

controlled by proper selection of organic insulating materials having low moisture absorbing characteristics.

3.10 All steel work shall be degreased, pickled and phosphated and then applied with two coats of Zinc Chromate primer and two coats of finishing synthetic enamel paint.

4.0 COMMON MARSHALLING BOXES 4.1 The outdoor type common marshalling boxes shall conform to the latest edition of IS 5039 and

other general requirements specified hereunder. 4.2 The common marshalling boxes shall be suitable for mounting on the steel mounting structures

of the instrument transformers. 4.3 One common marshalling box shall be supplied with each set of instrument transformers. The

marshalling box shall be made of sheet steel and weather proof. The thickness of sheet steel used shall be not less than 3.0 mm. It is intended to bring all the secondary terminals to the common marshalling.

4.4 The enclosures of the common marshalling boxes shall provide a degree of protection of not less than IP 55 (As per IS 2147).

4.5 The common marshalling boxes shall be provided with double hinged front doors with pad locking arrangement. All doors and removable covers and plates shall be sealed all around with neoprene gaskets or similar arrangement.

4.6 Each marshalling box shall be fitted with terminal blocks made out of moulded non-inflammable plastic materials and having adequate number of terminals with binding screws washers etc.

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Secondary terminals of the instrument transformers shall be connected to the respective common marshalling boxes. All out going terminals of each instrument transformer shall terminate on the terminal blocks of the common marshalling boxes. The terminal blocks shall be arranged to provide maximum accessibility to all conductor terminals.

4.7 Each terminal shall be suitably marked with identification numbers. Not more than two wires shall be connected to any one terminal. At least 20 % spare terminals shall be provided over and above the required number.

4.8 All terminal strips shall be of isolating type terminals and they will be of minimum 10 A continuous current rating.

4.9 All cable entries shall be from bottom. Suitable removable gland plate shall be provided on the box for this purpose. Necessary number of cable glands shall be supplied fitted on to this gland plate. Cable glands shall be screw on type and made of brass.

4.10 Each common marshalling box shall be provided with two numbers of earthing terminals of galvanised bolt and nut type.

4.11 All steel, inside and outside work shall be degreased, pickled and phosphated and then applied with two coats of Zinc Chromate primer and two coats of finishing synthetic enamel paint. The colour of finishing paint shall be as follows: -

i) Inside: Glossy White ii) Outside: Light Grey (Shade No. 697 of IS: 5) 5.0 TESTS 5.1 Routine/Acceptance Tests (all units) 5.2 All routine tests shall be carried out in accordance with relevant Standards. All routine/acceptance

tests shall be witnessed by the Employer/his authorised representative. 5.3 Type Tests: The bidder shall furnish type test certificates and results for the all tests as per

relevant Standards along with the bid for current and potential transformers of identical design. 5.4 Type test certificates so furnished shall not be older than 5 (five) years as on date of Bid

opening. 6.0 NAME PLATES 6.1 All equipment shall have non-corrosive name plates fix at a suitable position indelibly mark with

full particular there on in accordance with the standard adapted. 7.0 MOUNTING STRUCTURES 7.1 All the equipment covered under this specification shall be suitable for mounting on steel

structures. Supply of mounting structures is also in the scope of this tender. 7.2 Each equipment shall be furnished complete with base plates, clamps, and washers etc. and

other hardware ready for mounting on existing steel structures. 8.0 SAFETY EARTHING 8.1 The non-current carrying metallic parts and equipment shall be connected to station earthing grid. For this two terminals suitable for 40mm X 10mm GI strip shall be provided on each equipment. 9.0 TERMINAL CONNECTORS 9.1 The equipment shall be supplied with required number of terminal connectors of approved type

suitable for ACSR/XLPE cable. The type of terminal connector, size of connector, material, and type of installation shall be approved by the Employer, as per installation requirement while approving the equipment drawings.

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.

10.2 Current Transformers

i) Insulation Resistance Test for primary and secondary.

ii) Polarity test.

iii) Ratio identification test - checking of all ratios on all cores by primary injection of

current.

iv) Dielectric test of oil (wherever applicable).

v) Magnetising characteristics test.

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vi) Tan delta and capacitance measurement

vii) Secondary winding resistance measurement

viii) Contact resistance measurement (wherever possible/accessible).

10.3 Potential Transformers

i) Insulation Resistance test for primary (if applicable) and secondary winding.

ii) Polarity test.

iii) Ratio test

iv) Dielectric test of oil (wherever applicable).

v) Tan delta and capacitance measurement of individual capacitor stacks.

vi) Secondary winding resistance measurement.

11.0 TECHNICAL DATA SHEET FOR CURRENT AND POTENTIALTRANSFORMERS 11.1 For 33 kV/11kV CTs the instrument security factor at all ratios shall be less than 2.5 for

metering core. 11.2 TYPE AND RATING:

All instrument transformer shall be outdoor type, single phase, polycrete type suitable for mounting on steel structure. The instrument transformer shall have the following ratings and particulars.

SL No. Item

Ratings and Particulars

33 KV 11 KV

A Nominal system voltage 33 kV 11 kV

B Highest system voltage, kV 36 12

C Rated frequency ,HZ 50 50

D System earthing Solidly earth Solidly earth

E Insulation level

a) Impulse withstand voltage: kVp 170 70

b) One minute p.f. Withstand voltage, kV (r.m.s.) 70 28

F Short time current for one second, kA 16 12.5

G Minimum creepage distance, mm 900 360

H Temperature rise As per ISS As per ISS

J TRANFORMER C.T.

(i) No. of Cores 3 3

(ii) Transformation ratio 200-100/5-5-5A 600-300/5-5-2.89A

(iii) Rated out put

(a) Core-1 30 VA 30 VA

(b) Core-2 15 VA 15VA

(C) Core-3 - -

(iv) Accuracy class

(a) Core-1 0.5 0.5

(b) Core-2 5P 5P

(C) Core-3 PS PS

(v) Accuracy limit factor

(a) Core-1 - -

(b) Core-2 10 10

(C) Core-3 - -

(v) Instrument security factor

(a) Core-1 Less than 5 Less than 5

(b) Core-2 - -

(C) Core-3 - -

(v) Minimum Knee point voltage, Volts

(C) Core-3 100 Volts 100volts

FEEDER CT

(i) No. of Cores 2 2

(ii) Transformation ratio 400-200/5-5 300-150/5-5

(iii) Rated out put

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SL No. Item

Ratings and Particulars

33 KV 11 KV

(a) Core-1 30 VA 30 VA

(b) Core-2 15 VA 15 VA

(iv) Accuracy class

(a) Core-1 0.5 0.5

(b) Core-2 5P 5P

(v) Accuracy limit factor

(a) Core-1 - -

(b) Core-2 10 10

(v) Instrument security factor

(a) Core-1 <=5 <=5

(b) Core-2 - -

POTENTIAL TRANSFORMER 33kV/√3 /110V/√3 11kV/√3 /110V/√3

(a) Core Burden 30 VA 30 VA

(b) Accuracy class 0.5 05

(v) Rated voltage factor 1.2 1.2

Note:

i) It is intended to use different ratios of the same CT at the same time for differential

protections and metering cores. The CTS should therefore be suitable for the above purpose

by secondary tapings only. The ratio change by secondary taps is acceptable as long as the

required CT specifications are achieved at all ratios.

ii) The knee point voltage specified above shall be at higher ratio/ taps.

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7.5 TECHNICAL SPECIFICATION FOR 33KV & 11 KV ISOLATORS

1.0 SCOPE 1.1 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. 1.2 The Isolators are for outdoor installation suitable for horizontal/vertical mounting on mounting structures and for use at sub-stations. 1.3 Isolators shall be supplied with Earth Switch as and where specified. 2.0 GENERAL

2.1 The Isolators and accessories shall conform in general to IS 9921 (or IEC: 62271- 102) except to the extent explicitly modified in specification.

2.2 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.

2.3 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.

3.0 DUTY REQUIREMENTS 3.1 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.

3.2 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.

3.3 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.

3.4 The earthing switches shall be capable of discharging trapped charges of the associated lines. 3.5 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. 3.6 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. 4.0 CONSTRUCTIONAL DETAILS 4.1 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. 4.2 Contacts:

i) 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 atmosphere.

ii) 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.

iii) Contact springs shall not carry any current and shall not lose their characteristics due to

heating effects.

iv) 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.

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4.3 Blades:

i) 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 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.

ii) 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..

iii) 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.

iv) 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.

4.4 Insulators:

i) 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.

ii) Pressure due to the contact shall not be transferred to the insulators after the main blades are

fully closed.

4.5 Base:

Each isolator shall be provided with a complete galvanised steel base provided with holes and

designed for mounting on a supporting structure.

5.0 EARTHING SWITCHES 5.1 Where earthing switches are specified these shall include the complete operating mechanism

and auxiliary contacts. 5.2 The earthing switches shall form an integral part of the isolator and shall be mounted on the

base frame of the isolator. 5.3 The earthing switches shall be construction ally 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.

5.4 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.

5.5 The frame of each isolator and earthing switches shall be provided with two reliable earth terminals for connection to the earth mat.

5.6 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.

5.7 The earth switch should be able to carry the same fault current as the main blades of the Isolators and shall withstand dynamic stresses.

6.0 OPERATING MECHANISM 6.1 The bidder shall offer manual operated Isolators and earth switches.. 6.2 Control cabinet/operating mechanism box shall be made of aluminum sheet of adequate

thickness (minimum 3 mm). 6.3 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.

7.0 OPERATION 7.1 The main Isolator and earth switches shall be gang operated. 7.2 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

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mechanism to prevent accidental opening by wind, vibration, short circuit forces or movement of the support structures.

7.3 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.

7.4 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.

7.5 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.

7.6 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.

7.7 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.

7.8 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.

8.0 TEST AND INSPECTION 8.1 The switches shall be subjected to the following type test in accordance to with IS: 9920 or

equivalent international specifications. 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

v) Rated line charging breaking capacity

vi) Rated short time current

vii) Rated peak withstand current

viii) Mechanical and Electrical Endurance

8.2 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.

8.3 The porcelain will have pull out test for embedded component and beam strength of porcelain base.

9.0 CONNECTORS 9.1 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.

10.0 SUPPORTING STRUCTURES 10.1 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

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tenderer. The isolators should have requisite fixing details ready for mounting them on switch structures.

11.0 PRE-COMMISSIONING TESTS 11.1 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.

12.0 TECHNICAL DATA SHEET FOR ISOLATORS

SL No.

Technical Particulars Isolators class

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, center pole rotating

Double Break, center pole

rotating

5 Rated continuous current, A 800 A 630 A

6 Rated short time current, kA for 3sec

25 16

7 Rated duration of short time current, Second

3 3

8 Rated lightning impulse withstand voltage, kV (peak) i) To earth & between poles ii) Across isolating distance

170 170

95 95

9 Rated 1 minute power frequency withstand voltage, kV (rms) i) To earth & between poles ii) Across isolating distance

70 80

28 40

10 Minimum creepage distance of insulators, mm

900

400

11 Temperature rise As per relevant IS

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7.6 TECHNICAL SPECIFICATION OF BATTERY BANK

1.0 SCOPE This Section of the Specification covers the design, manufacture, and testing at manufacturer’s work, of stationary type sealed, Valve Regulated Lead Acid Battery Bank, Battery Charger, complete with all required accessories for various Sub-stations. 2.0 BATTERY BANK 2.1 TECHNICAL PARTICULARS OF BATTERY BANK

1. Battery Rating 110 V-100 Ah to 1.75 ECV at C10 at 27⁰ C

2. Type of battery Maintenance free valve regulated lead acid (MF-VRLA) battery

3. Battery specification

Batteries conforms to IS 15549:2005 Also conforms to International Standards (I) IEEE 1188 and 1189 (II) BS6290 Part 4/ IEC 896

4. Manufacturers cell designation F 100 P

5. No of Cells 55 Nos.

6. Cycle life of Battery @ 27⁰ C

2000 cycles for 50 % depth of discharge or 1200 cycles for 80 % depth of discharge

7. All efficiency Above 90%

8. WH Efficiency Above 80 %

9. Self discharge/ Week < 1% of rated capacity

10. Max, allowable ambient temp at which cell can safely operate

55⁰ C continuously and 70⁰ C short time

11. Overall dimension of each cell (107.8 x 198.5 x 477)mm approx.

12. Overall weight of each cell 27 kg approx.

13. Recommended Max period of storage 6 months from the date of manufacturing and the

batteries shall be stored in covered area at 27⁰ C

14. Material of container Polypropylene co-polymer

15. Type of separator Highly absorbent micro porous spun glass matrix (AGM)

16. Type of +ve & -ve plates Flat pasted

17. Material of rack Mild steel coated with acid resistance paint

18. Method of connection between cells Bolted

19. Recommended float charge

Batteries shall be charged in constant potential mode with current limit Voltage: 2.23-2.25 Volts per cell Current: Recommended- charging current is 45 amps

20. Recommended boost charge Voltage: 2.3 Volts per cell Current: Recommended- charging current is 45 to 90 amps

21. Time required for boost charge from fully

discharged condition at 27⁰ C

9 Hrs for 90 % state of charge (or) 24 hrs for 100 % state of charge

22. Voltage ripple allowable < 2% of the RMS value

23. Type of connectors Lead coated heavy duty copper strips

2.1.1 PLATES

Positive plates shall be made of flat pasted type using lead-cadmium antimony alloy for durability, high corrosion resistant, maintenance free, long life both in cyclic as well as in ,float applications. Negative plates shall be heavy duty, durable flat plate using lead calcium alloy pasted box grid. Negative plates shall be designed to match the life of positive plates and combination of negative and positive plates shall ensure long life, durability and trouble free operation of battery.

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PLC operated equipment should be deployed for preparation of paste to ensure consistency in paste quality. Conventional / manual type of paste preparation is not allowed.

2.1.2 CONTAINER AND LID The containers and lids shall be made of a special grade polypropylene copolymer plastic material. They shall be sufficiently robust and not liable lo deformation under internal operating pressures and within the temperature range naturally encountered, leak proof, non-absorbent and resistant to the acid with low water vapour permeability.

2.1.3 VENT PLUGS : Each cell shall be equipped with one-way safety valve with opening pressure of 5±1 psi and closing pressure 4±1 psi. The vent plug shall be made with suitable grade of fire retardant plastic material. Each valve opening shall be covered with flame barrier capable in preventing the ingress of flame into the cell interior when the valve opens and hydrogen / oxygen gas mixture is released.

2.1.4 SEPARATORS : Separator shall be made of spun glass, micro porous matrix and shall be resistant to Sulphuric Acid. It shall be capable of keeping the entire electrolyte and shall be electrically insulated. Sufficient separator overlap and PVC shield protection to top and bottom edges of the plates is to be provided to prevent short circuit formation between the edges of adjacent plates.

2.1.5 CONNECTORS : The connectors shall be lead coated copper of suitable size to join the cells. The connectors shall be suitably designed and coated to withstand corrosion due to sulphuric acid. The coating should be adequate and tenacious. All the copper inter cell connectors shall be provided with heal shrinkable sleeves except at the connecting points.

2.1.6 ELECTROLYTE: The electrolyte shall be prepared from the battery grade Sulphuric Acid confirming to ISS: 266. The batteries shall be supplied in factory filled and charged condition.

2.1.7 WATER Water required for preparation of electrolyte shall conform to IS: I069 or equivalent international specifications.

2.1.8 PLATE CONNECTION Lugs of plates of like polarity shall be connected by lead burning to a horizontal strap having an upstanding terminal post adopted for connection to external circuit. Strap and post shall be caste with lead alloy. The positive and negative terminal posts shall be clearly marked for unmistakable identification.

2.1.9 BOLTS AND NUTS Nuts and Bolts for connecting the cells shall be of superior grade passivated Stainless

steel. 2.1.10 TERMINALS

Terminals shall be of integral lead terminal with solid copper core with M6 threading for fastening. The junction between terminal posts and cover and between the cover and container shall be hermetically sealed.

2.1.11 BATTERY RACKS Batteries shall be installed on MS racks to be supplied by the Contractor to fit in the battery room. Racks/Trays shall be powder coated with anti corrosive paint. Rack shall accommodate 55 cells plus 2 spares. Racks/Tray shall be suitably treated before painting for protection against fungus growth and other harmful effects due to tropical environment. The colour of the supporting racks shall conform to RAL 7032 shade.

a) cy H.V. test / Insulation tests

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7.7 TECHNICAL SPECIFICATION FOR BATTERY CHARGING EQUIPMENTS

1.0 GENERAL DESCRIPTION

The battery charging equipment shall be capable of giving two rate of charging currents namely Boost Charge and Trickle Charge. The charging equipments capable of giving two rate of charging currents shall consist of two separate sections: Boost Charger Section & Trickle Charger Section. The Trickle Charger Section along with all necessary equipments is required for the purpose of float charging one battery bank of 55 cells of capacity 100 Ah at 10 hours discharge rate at the rate of 2.0 volts to 2.3 volts per cell and for meeting a constant D.C. load of 10 Amperes at 110 Volts D.C. simultaneously. The Boost Charger Section along with all necessary equipments is required to charge a battery bank of 55 cells of capacity 100 Ah at 10 hours discharge rate at the rate of 1.85 volts to 2.55 volts per cell and for meeting a constant D.C. load of 10 Amperes simultaneously.

2.0 TYPE AND RATING i) TYPE

The charger shall be static type, using Silicon Rectifiers. The rectifiers shall be arranged in three phase bridge circuit for full wave rectification. The charger unit shall be suitable for operation on 415 volts three phase, 4 wire, 50 Hz A.C. Supply. The Boost and Trickle Charger section shall have an arrangement for automatic and manual D.C. voltage regulating system with an Auto / Manual change over switch.

ii). RATING The entire charger circuitry shall have two separate sections eg. Boast charger and Trickle charger sections and shall of following ratings:

2.1 Float Charger (a) D.C. Output Voltage: (i) The D.C. output voltage of the Float charger shall be 110 volts (nominal).

(ii) The D.C. output voltage of the Float charger shall be adjustable between 110 volts to 126.5 volts.

(b) D.C. Output Current: (i) The Trickle charger shall be capable of supplying a continuous D.C. load of 10 amperes and float a battery bank of 100 Ah at 10 hours discharge rate simultaneously at a normal voltage of 110 volts D.C.

2.2 Boost charger: (a) The D.C. output voltage of the Boost charger section shall be adjustable between 101 volts to 140

volts. (b) D.C. Output Current: The Quick charger shall be capable of charging a battery bank of 100 Ah

capacity at 10 hours discharge rate and to meet a continuous D.C. load of 5 amperes simultaneously. Output current of the Boost charger shall not be less than about 20 Amperes.

2.3 OPERATION AND CONTROL REQUIREMENTS: The incoming A.C. supply for Quick and Trickle charger shall be controlled by rotary switches. In addition to the rotary switches supplies to the both chargers shall be controlled by two push button operated contractors having overload protection. ‘RED’ & ‘GREEN’ indicating lamps shall be provided to indicate ‘ON’ & ‘OFF’ conditions respectively of the Quick and Float charges in addition to the A.C. ‘ON’ indication. During normal operation of the Trickle charger shall supply the normal direct current requirements of the substation and the station battery shall be floating on D.C. system. In the event of failure of A.C. supply or failure of the charger itself the battery shall come automatically across the load without any interruption. It is intended to supply the D.C. load of the equipment normally by the float charger during boost charging of the bank. Thus, when the Boost charger is switched ‘ON’ the Boost charger and the battery bank shall be isolated from the float charger and the load automatically. If during boost charging operation, the A.C. supply fails, the battery shall come automatically across the load without any interruption. During the infinitely small time required for initiation of the contractor a reduced number of cells shall be available across the load, through the blocking diode. Provision shall also be made so that in the event of failure of Float Charger, the Boost charger shall supply the load as well as charging a battery bank. Arrangement shall be made to limit the voltages across the load to around 110 volts, even if the boost charger is operating at maximum charging voltage. This aspect shall be clearly brought out in the tender by the bidder. In this operation also, the battery bank should come across the load automatically and without any interruption in the event of A.C. mains failure.

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2.4 VOLTAGE REGULATING SYSTEM The Float and Boost Charger sections shall have suitable arrangement for regulation of D.C. output voltage by the following methods. (a) Automatic Voltage Regulation. (b) Manual Voltage Regulation.

(a) Automatic Voltage Regulation: The Automatic Voltage Regulation shall hold the voltage flat from zero to full load within ±1% of pre-set value of the charger with a fluctuation of ±10% in voltage and ±5% in frequency in the A.C. input voltage. The setting device of the automatic voltage regulator shall be so designed that the D.C. output voltage can be set anywhere between (i) 100 volts to 126.5 volts for Float Charger and (ii) 100 volts to 140 volts for Boost Charger. The automatic voltage regulator shall be static type and its characteristics shall be supplied with the tender.

(b) Manual Voltage Regulator: The Manual Voltage Regulator for Trickle charger shall have suitable equipments and means to control the D.C. output voltage with the ranges mentioned earlier. The voltage control shall be smooth and continuous. The charger shall have a change over switch for selecting ‘Auto’ or ‘Manual’ mode of regulation to regulate the D.C. voltage. The tenderer shall furnish all the details of the manual voltage regulator in the tender. Both the trickle and boost chargers shall be provided with alarm and indication for the following: Mains on Charger failed. Rectifier element fuse blown. Charger output fuse blown. AC input failed In addition to the above arrangement for controlling, regulating and operation of the charger, the bidder may suggest and quote suitable alternative arrangement for the same. The right of acceptance of such an arrangement shall however, lie with the Employer.

2.5 INSTRUMENTS, EQUIPMENTS, ETC i) Rectifier Transformer

The rectifier transformers shall be designed to operate at a frequency of 50 Hz and at the r.m.s. voltage between the lines on the line side of transformers of 415+10% volts. The rating of the rectifier transformer shall correspond to the rating of the associated rectifier assembly. The transformer should preferably be air cooled dry / synthetic oil filled type and shall conform to the latest issues of IS: 2026 and IS: 4540.

ii) Rectifier Elements Rectifier elements shall be Silicon and shall be arranged in three bridge circuit. The rectifier elements shall be protected by HRC fuse with fuse blow out indication. The rectifier stacks shall be supplied with their own heat dissipating arrangement for natural air cooling.

iii) Measuring Instruments: The instruments shall be flush type and shall have dust proof and moisture resistant enclosed cases, finished in black and suitable for tropical use. Elements shall be shock resistant and shielded from external magnetic fields. The instruments and meters shall have easy accessible means for calibration testing and adjustment and shall conform to relevant I.S.S.

iv) Air Break Switches and Fuses: The series combination air break rotary switches and HRC fuses shall conform to provisions of the latest issue of IS-4064, IS-4047 and IS-2208. the air break switches and fuses housed in the charger panel shall be so arranged that when they are opened, the terminals are readily accessible. Switches shall be of rotary operated type preferably with silver to silver contacts of adequate making, carrying and breaking current ratings and shall open and close with snap action to minimise arcing. The ‘ON’ and ‘OFF’ positions of the switches shall be definite and shall be clearly indicated. All fuses shall be of HRC type conforming to the latest issue of I.S. 2208.

v) The charger units shall be provided with but not limited to the following instruments and equipments.

a) 3 Pole A.C. mains ON-OFF switches and HRC fuses of suitable capacity.

b) 2 pole air break switches with HRC fuses of suitable capacity output side of chargers.

c) Air break magnetic contactors of suitable ratings complete with push button and

thermal overload devices and red and green indicating lamps for A.C. input ON/OFF

to the chargers.

d) Fuse blown out indication for D.C. output fuses.

e) HRC fuses for protection of rectifier elements with fuse blow out indication.

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f) 0-500 volts range, A.C. voltmeters to measure A.C. input voltage to the chargers.

Accuracy class 1.0 as per I.S. 1248.

g) Moving coil, flush mounting type voltmeters of suitable ranges to measure trickle,

boost and battery voltages. Accuracy class: 1.0 as per I.S.-1248.

h) Moving coil, flush mounting type ammeters of suitable scales to read the output

currents of boost and trickle chargers and load current. Accuracy class : 1.0 as per

I.S.-1248.

i) Single pole D.C. contactors of suitable ratings.

j) Blocking diode of adequate capacity.

k) Cubicle illuminating lamps with door operated switches suitable for 240 volts A.C.

l) All other equipments and accessories for indication and alarm annunciation as

mentioned earlier.

m) All other equipments not specifically mentioned but required for proper and

satisfactory operation of the charger shall be provided.

n) The charger assembly shall be complete with input / output terminals, cable glands,

internal wiring, earthing terminals, rating plates, etc.

2.6 CONSTRUCTIONAL FEATURES: The whole battery charging equipments shall be housed in an indoor, floor mounting type; sheet metal clad, cubicle type enclosures which shall also be served as charger panels. The assembly shall be complete in all respect and shall contain all the components described in different clauses and which are essential for the proper operation and control of the equipments. The enclosures shall be totally enclosed dust tight and vermin proof. All doors and covers shall be filled with rubber gaskets. The panels shall have double leaf hinged doors at the back and shall be provided with locks and duplicated keys. The equipments in the panels shall be so located as not to cause congestion and accessibility to the equipments located herein shall be easy and convenient. All incoming and outgoing cables shall enter from bottom and suitable cable terminal boards with cable lugs shall be provided in side of each panel for incoming and outgoing cables. Each terminal of the terminal boards shall be serially numbered to facilitate connections. At least 20% extra terminals shall be provided in each terminal board. Suitable compression type cable glands with base plates shall also be provided. The terminal boards shall be easily accessible for inspection and checking. The panels shall have cable supports and metallic clips for supporting power and control cables for internal wiring of the panels.

2.7 TESTS The battery charger and all the components of the charger shall be routine tested accordingly to their relevant standard. This shall include the following:

a) Operational check for boost and float charger.

b) Input / Output test of the chargers.

c) Performance test of the charger.

d) Temperature rise test of the rectifier transformer.

e) Power frequency.

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7.8 TECHNICAL SPECIFICATION 38 KV OUTDOOR COMMUNICABLE AUTO-

RECLOSER VACUUM CIRCUIT BREAKER

Pole / Structure mounted 38 kV Outdoor Communicable Auto-Recloser Vacuum Circuit Breaker

with In-Built Current and Voltage Sensors & Pole / Structure Mounted Numeric Control Panel for

Protection, Metering, Data-Logging And Communication

1.0 SCOPE:

1.1 DETAILED SCHEDULE OF EQUIPMENTS & ACCESSORIES (Compulsory):

1.1.1 Pole / Structure mounted Auto-Recloser VCB with magnetic actuator drive closing and

spring tripping mechanism, rated 38 KV, 1250 Amps, 16 KA with built-in current and

voltage sensors

1.1.2 Pole / Structure mounted outdoor numeric control panel with 12 volts battery, for

metering, protection, data-logging, local as well as remote control & communication

through Bluetooth module / GPRS communication modem, along-with integral

arrangement

1.1.3 Rugged & flexible weather-proof conduits for connection from Recloser VCB to outdoor

control panel.

2.0 STANDARDS:

The 38KV outdoor auto-recloser vacuum circuit breaker with accessories will conform to latest revisions with amendments of standards as under:

IEEE Std. C37.60 – IEEE standard requirements for overhead, pad mounted, dry vault and submersible automatic circuit reclosers and fault interrupters for alternatic current systems up to 38 kV.

IEC 60529 - Spec. for degree of protection provided by enclosures (IP code).

IS : 3156 / IEC 60186 - Voltage transformers.

IEC 60255 - Electrical Relays for power system protection.

3.0 GENERAL FEATURES:

The design of the equipment ensures that the maximum temperature in any part of the equipment at specified rating will not exceed the permissible limits as stipulated in the relevant standards. The equipment will be capable of withstanding the dynamic and thermal stresses of rated short circuit current without any damage. The safety clearances of all live parts of the equipment shall be as per relevant standards. The Auto-Recloser Vacuum Circuit Breaker shall be mounted on a single pole or structure for outdoor installation. coil current sensors and Capacitive coupled voltage sensors for protection and metering will be embedded into the bushings of the Recloser. There may be provision given on VCB mounting bracket to install surge arrestors on both the sides of the VCB. Surge arrestor is an optional item The breaker is capable of clearing the ‘kilometric’ fault of same magnitude as rated short circuit current. The breaker is capable of interruption of low reactive current (lagging / leading) without undue over voltage. The outdoor numeric control cubicle shall be mounted at man height on the same pole / structure as the vacuum circuit breaker. All wiring connections from VCB to control panel shall be enclosed in a weather-proof, flexible and rugged metallic conduit of requisite length. A single phase outdoor voltage transformer could be provided for auxiliary power supply input for the battery in the recloser control panel. The VT, made of cyclo-aliphatic resin, will also be mounted on the same pole / structure, at same height but on the other side of vacuum circuit breaker. Primary side of voltage transformer should be connected to supply incoming side. Weather-proof, flexible and rugged metallic conduit of requisite length could be provided to enclose secondary wires of VTs. VT will not be required if auxiliary supply within the range 85-265 volts (ac or dc) is available at site. Voltage Transformer is an optional item.

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4.0 CONSTRUCTIONAL FEATURES OF AUTORECLOSER VCB:

The circuit breaker tank shall be dust and vermin proof tight.

The recloser VCB should have rated life of 20,000 C-O cycles at full rated current of 1250 Amps and 100 C-O operations at full short circuit breaking current of 16 kA.

It should be totally maintenance-free during its entire service life.

The auto-recloser VCB should have position indicator (open / close) at the two sides which is clearly viewable from ground level.

The auto-recloser should have a manual emergency trip hook which can be directly operated from the ground level.

The recloser also should have the arrangement for closing and tripping from a remote location at any distance using the wireless network in addition to local electrical tripping & closing and local emergency tripping (mechanical).

No separate dc auxiliary supply should be required to be provided for closing and tripping the recloser. Auxiliary supply for closing and tripping should be sealed maintenance free valve regulated lead acid battery, provided in outdoor control panel.

All the six recloser VCB primary terminals are brought out through ultra-violet stable polymer bushings with silicone rubber bushing boots. Bushing creepage distance is 1050mm / 1710 mm with Flexible Extension. Bushings are designed to have the necessary mechanical strength & rigidity required and are free from objectionable interference and external & internal corona.

Coil current sensors are embedded in recloser VCB bushings. Such sensors do not saturate easily and do not need to be replaced on future increase of system load. They measure from 0 - 8000 Amps without saturation.

Capacitively coupled voltage sensors are also embedded in bushing to measure line-line voltage with an accuracy limit greater of +/- 0.1kV or +/- 1%.

The recloser VCB, control gear, VT and surge diverter will all be mounted on one single pole. They will be supplied complete with necessary mounting arrangement, nuts, lifting lugs, earth stud etc.

The primary bushing terminals are suitable for direct reception of line conductors without the necessity of any additional terminal connectors.

The VCB is suitable for connecting GI flats or single core cables for safety earth connection of

the switchgear enclosure

5.0 CONSTRUCTIONAL FEATURES OF RECLOSER CONTROL CUBICLE:

The outdoor pole mounted control cubicle houses the following functional units: A. AC input auxiliary power supply interface with filter unit for impulse noise protection. B.12V,26AH rechargeable sealed-maintenance-free battery to provide uninterruptible DC

auxiliary power supply for numeric data processing, VCB numeric control & monitoring and for the communication modem. Battery is suitable to provide back-up supply up-to 48 hours after loss of ac input auxiliary supply (without communication). Battery should have an average life expectancy of around 10 years.

Thermal sensor continuously monitors the healthiness of the battery and any battery unhealthy condition will be logged as a malfunction event. The battery shutdown time, ampere-hour capacity, RTU shutdown level / supply voltage, all are programmable through the recloser control module both from local MMI or laptop as well as from remote through telecommunication interface. C. Micro-processor based recloser numeric control unit for data processing for protection and metering functions; control, monitoring and status indication of VCB / battery / self; logging of all types of data; communicating with remote through tele- communication unit (RTU) and RS 232 communication port and communicating with laptop at local through an USB port. This unit has a graphical LCD display for operator’s local interface.

D. Integrated Wi-Fi for point-to-point wireless connection between the recloser control unit and a personal computer or laptop.

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E. Driver unit, which is an interface between the numeric control unit and the recloser VCB for performing VCB closing and tripping. This unit continuously monitors itself and report to the control unit any kind of malfunction detected, including VCB healthiness, like actuator coil healthiness, excessive trip or close time etc. F. Integrated Remote Tele-communication Unit (RTU) for communicating from remote Monitoring and control (any distance) through GSM/GPRS for SCADA communication.

6.0 KEY FEATURES & FUNCTIONS

It has a real time clock (RTC) configurable both on 12 hour or 24-hour format.

Non-directional or directional over-current protection with 3 forward direction and 3 reverse direction protection elements user configurable per trip. Protection curves are selectable from ANSI inverse curves, IEC 60255 inverse curves, instantaneous high set element and definite time protection as well as user defined curves.

Non-directional or directional earth fault protection with 3 forward direction and 3 reverse direction protection elements user configurable per trip. Protection curves are selectable from ANSI inverse curves, IEC 60255 inverse curves, instantaneous high set element and definite time protection as well as user defined curves.

Non-directional or directional sensitive earth fault protection to protect against resistive earth faults and are user configurable for definite time operation in both the forward and reverse directions.

Sensitive fault protection to protect against Winding temp and bucolz along with differential operation.

The above protection elements are independently configurable to operate as a directional or non-directional protection element.

Independent sets of protection settings shall be available to configure for different system configuration and quick changeover from one set to another.

Under voltage protection to provide 3 phase load shedding, loss of phase protection and loss of supply operation for automatic power back-feed restoration scheme.

Under frequency protection with user programmable pickup range and operating time.

Auto-reclosing after tripping due to phase fault, earth fault, sensitive earth fault, under voltage and under frequency. The number of trips to lockout, the reclose time and other reclosing parameters are all separately configurable for each type of auto-reclose.

Bolted fault detector to discern heavy faults very close to the VCB bushings. The bolted fault detector element is independent from the short-circuit protection elements and inhibits auto-reclosing if a bolted fault is detected.

Zone sequence co-ordination (ZSC) is provided which works either in the independent mode where all settings are fully editable without any restriction and recloser will only check each value for setting range validity OR the auto-correct mode where the recloser will edit and automatically correct protection settings of its own and of other reclosers in series through the communications network and comprehensively achieve grading of all protection devices (including fuses, using fusing characteristics) in the system. ZSC can be effectively employed to achieve ‘fuse burning’ or ‘fuse saving’ stratetgy.

Cold load pick up which protects against nuisance overload tripping after a close operation has occurred to resume power supply after a power outage. This feature is user configurable as per the system load conditions and power outage time with programmable current multiplier and ramp up and down times.

Inrush restraint which protects against instantaneous overload tripping on inrush currents after a close operation, with user configurable inrush current multiplier and operating time settings.

A detailed event log to register most recent events for close-open & fault protection operations, time stamped to 1ms precision. This feature is to provide a clear and concise field report on why the recloser has operated, the faulted phase, type of fault, level of fault current at instant of contact separation and prospective peak of fault current. The event log is viewable by uploading to a PC using the software package provided with each recloser VCB.

A change messages log which registers up to 100 events associated with control instructions issued via man-machine local interface of control unit or laptop from local or from remote through tele-communication interface.

Fault profile data logger which logs up to 10000 readings of fault data related to activity of protection, time stamped with an accuracy of 1 ms. Time interval between the readings is one cycle of power frequency.

Load profile data logger which should log at least 9000 readings of both single phase and three phase active and reactive power demand history, time stamped with an accuracy of 1 ms and integrated over a user configurable 5 / 10 / 15 / 30 / 60 minute period.

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Measurement of instantaneous phase voltage; phase current; residual current; frequency; single phase and three phase power factor; single phase & three phase active power & reactive power and recording of single phase & three phase, active energy & reactive energy. All measurements are based on analogue inputs from current and voltage sensors and converted to true rms (harmonic-filtered) digital inputs. Overall measurement accuracy, including current and voltage sensor errors, do not exceed +/- 5% for active, reactive and total power as well as for active and reactive energy.

All protection settings, measurements and logs are easily downloadable from a laptop or PC using the software package provided with the recloser.

Protection counters to record the number of protection trips by each individual tripping element.

Lifetime counters to record the total C-O operations, the mechanical wear (displayed as a percentage of rated C-O operations life) and the maximum main contact wear on any of the three phases of VCB, computed for each phase from the contact wear consumed after each interruption and displayed as a percentage of the maximum allowed.

Communications from remote using GPRS / GSM / radio / telephone modem or converter or direct communication using DNP3 or Modbus protocols.

The use of one magnetic actuator to drive the vacuum bottles through multiple linkages is not acceptable.

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7.9 TECHNICAL SPECIFICATION FOR 11 KV OUTDOOR COMMUNICABLE AUTO-RECLOSER

VACUUM CIRCUIT BREAKER

15 kV Outdoor Communicable Auto-Recloser Vacuum Circuit Breaker with In-Built Current

and Voltage Sensors & Pole / Structure Mounted Numeric Control Panel for Protection,

Metering, Data-Logging And Communication

1. SCOPE:

1.1 DETAILED SCHEDULE OF EQUIPMENTS & ACCESSORIES: 1.1.1 Pole / Structure mounted Auto-Recloser VCB with magnetic actuator drive

closing and spring tripping mechanism, rated 15.5 KV, 630 Amps, 16 KA with built-in current and voltage sensors along with pole mounting brackets

. 1.2 Pole / Structure mounted outdoor numeric control panel with 12 volts battery, for metering, protection, data-logging, local as well as remote control & communication through Bluetooth module / GPRS communication modem, along-with integral pole mounting arrangement. Rugged & flexible weather- proof conduits of 07 metre length for connection from Recloser VCB to outdoor control pane.

2. STANDARDS: The 15KV outdoor pole mounted auto-recloser vacuum circuit breaker with accessories will

conform to latest revisions with amendments of standards as under: IEEE Std. C37.60 – IEEE standard requirements for overhead, pad mounted, dry vault and

submersible automatic circuit reclosers and fault interrupters for alternatic current systems up to 38 kV.

IEC 60529 - Spec. for degree of protection provided by enclosures (IP code). IS : 3156 / IEC 60186 - Voltage transformers. IEC 60255 - Electrical Relays for power system protection. 3.0 GENERAL FEATURES:

The design of the equipment ensures that the maximum temperature in any part of the equipment at specified rating will not exceed the permissible limits as stipulated in the relevant standards. The equipment will be capable of withstanding the dynamic and thermal stresses of rated short circuit current without any damage. The safety clearances of all live parts of the equipment shall be as per relevant standards. The Auto-Recloser Vacuum Circuit Breaker shall be mounted on a single pole or structure for outdoor installation. 6 nos. coil current sensors for protection and metering will be embedded into the bushings of the Recloser, 3 on the incoming side bushings and 3 on the outgoing side bushings. Capacitive coupled voltage sensors embedded into each phase bushing of both sides of the Recloser for protection and metering. There is the provision on VCB mounting bracket to install surge arrestors on both the sides of the VCB. Surge arrestor is an optional item The breaker is capable of clearing the ‘kilometric’ fault of same magnitude as rated short circuit current. The breaker is capable of interruption of low reactive current (lagging / leading) without undue over voltage. The outdoor numeric control cubicle shall be mounted at man height on the same pole / structure as the vacuum circuit breaker. All wiring connections from VCB to control panel shall be enclosed in a weather-proof, flexible and rugged metallic conduit of requisite length. A single phase outdoor voltage transformer could be provided for auxiliary power supply input for the battery in the recloser control panel. The VT, made of cyclo-aliphatic resin, will also be mounted on the same pole / structure, at same height but on the other side of vacuum circuit breaker. Primary side of voltage transformer should be connected to supply incoming side. Weather-proof, flexible and rugged metallic conduit of requisite length could be provided to enclose secondary wires of VTs. VT will not be required if auxiliary supply within the range 85-265 volts (ac or dc) is available at site. Voltage Transformer is an optional item.

4.0 CONSTRUCTIONAL FEATURES OF AUTORECLOSER VCB:

The Recloser shall be three pole fixed type, light-weight and installed in an enclosed metal tank of corrosion proof aluminum alloy.

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The entire metal surface shall be chemically treated and coated with powder polymer paint. The circuit breaker tank shall be dust and vermin proof tight.

Only solid dielectric material is used for insulation purposes in the auto-recloser.

To adhere to the closing characteristic requirements of a vacuum circuit breaker, the recloser is equipped with 3 no. single coil magnetic actuator drive mechanisms, one for each pole resulting in direct and linear closing motion for each phase. An interlocking shaft ensures simultaneous closing and tripping of the three phases and aborts electrical closing of the healthy pole(s) in case any malfunction is detected in the other(s).

The recloser VCB remains latched in closed position purely due to magnetic forces. The drive mechanism is completely free from mechanical latching and use of mechanical components like gears, chains, links, levers, ratchets, spring charging motors etc. is completely avoided, both for closing and for keeping latched in closed position.

To adhere to the tripping characteristic requirements for a VCB, tripping is performed through charged springs. The closing action of the magnetic actuators charge contact loading and tripping springs, which performs the tripping action.

The recloser VCB has a rated life of 30,000 C-O cycles at full rated current of 630 Amps and 200 C-O operations at full short circuit breaking current of 16 kA.

The recloser VCB and the actuator mechanism shall not need any lubrication and adjustment or any other kind of maintenance and / or replacement of any parts or components during its guaranteed lifetime of 30,000 C-O cycles.

The auto-recloser VCB has position indicator (open / close) at the bottom side which is clearly viewable from ground level.

The auto-recloser also has at the bottom side a manual emergency trip hook which can be directly operated with a hook-stick from the ground level.

The recloser also has an arrangement for closing and tripping from a remote location at any distance using the wireless network in addition to local electrical tripping & closing and local emergency tripping (mechanical).

Though closing and tripping is performed by the same single coil, the closing and tripping power is provided by separate charged capacitors (provided in the ‘Driver Module’ of RC cubicle). The power required after each close and trip operation is minimal. The power requirement after each close operation is 50 Watts, after each trip operation is 10 Watts.

No dc auxiliary supply is required to be provided by user for closing and tripping the recloser. All the six recloser VCB primary terminals are brought out through ultra-violet stable polymer bushings with silicone rubber bushing boots. Bushing creepage distance is 500 mm. Bushings are designed to have the necessary mechanical strength & rigidity required and are free from objectionable interference and external & internal corona.

Coil current sensors shall be embedded in each of the six recloser VCB bushings. Such sensors shall not saturate easily and do not need to be replaced on future increase of system load.

Capacitively coupled voltage sensors are also embedded in each bushing to measure line-line voltage from 0 - 30 kV and line-earth voltage from 0 - 18 kV, with an accuracy limit greater of +/- 0.1kV or +/- 1%.

The recloser VCB, control gear, VT and surge diverter will all be mounted on one single pole. They shall be supplied complete with necessary mounting arrangement, nuts, lifting lugs, earth stud etc.

The VCB shall be suitable for connecting GI flats or single core cables for safety earth

connection of the switchgear enclosure.

5.0 CONSTRUCTIONAL FEATURES OF RECLOSER CONTROL CUBICLE:

The outdoor pole mounted control cubicle houses the following functional units:

A. AC input auxiliary power supply interface with filter unit for impulse noise protection.

B. Rechargeable sealed-maintenance-free battery to provide uninterruptible dc auxiliary power supply for numeric data processing, VCB numeric control & monitoring and for the communication modem. Battery shall suitable to provide back-up supply long hours after loss of ac input auxiliary supply (without communication).

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Thermal sensor continuously monitors the healthiness of the battery and any battery unhealthy condition will be logged as a malfunction event. The battery shutdown time, ampere-hour capacity, RTU shutdown level / supply voltage, all are programmable through the recloser control module both from local MMI or laptop as well as from remote through telecommunication interface.

C. Micro-processor based recloser numeric control unit for data processing for protection and metering functions; control, monitoring and status indication of VCB / battery / self; logging of all types of data; communicating with remote through tele-communication unit (RTU) and RS 232 communication port and communicating with laptop at local through an USB port.

D. Bluetooth module (BTM) for point-to-point wireless connection between the recloser control unit and a personal computer or laptop.

E. Driver unit, which shall be interface between the numeric control unit and the recloser VCB for performing VCB closing and tripping. This unit continuously monitors itself and report to the control unit any kind of malfunction detected, including VCB healthiness, like actuator coil healthiness, excessive trip or close time etc.

F. Remote Tele-communication Unit (RTU) for communicating from remote (any distance) through GSM/GPRS network.

6.0 KEY FEATURES & FUNCTIONS

It has a real time clock (RTC) configurable both on 12 hour or 24-hour format.

Non-directional or directional over-current protection with 3 forward direction and 3 reverse direction protection elements user configurable per trip. Protection curves are selectable from ANSI inverse curves, IEC 60255 inverse curves, instantaneous high set element and definite time protection as well as user defined curves.

Non-directional or directional earth fault protection with 3 forward direction and 3 reverse direction protection elements user configurable per trip. Protection curves are selectable from ANSI inverse curves, IEC 60255 inverse curves, instantaneous high set element and definite time protection as well as user defined curves.

Non-directional or directional sensitive earth fault protection to protect against resistive earth faults and are user configurable for definite time operation in both the forward and reverse directions.

The above protection elements are independently configurable to operate as a directional or non-directional protection element.

Independent sets of protection settings shall be configurable to allow for different system configuration and quick changeover from one set to another.

Under voltage protection to provide 3 phase load shedding, loss of phase protection and loss of supply operation for automatic power back-feed restoration scheme.

Under frequency protection with user programmable pickup range and operating time.

Auto-reclosing after tripping due to phase fault, earth fault, sensitive earth fault, under voltage and under frequency. The number of trips to lockout, the reclose time and other reclosing parameters are all separately configurable for each type of auto-reclose.

Bolted fault detector to discern heavy faults very close to the VCB bushings. The bolted fault detector element shall be independent from the short-circuit protection elements and inhibits auto-reclosing if a bolted fault is detected.

Zone sequence co-ordination (ZSC) shall be provided which works either in the independent mode where all settings are fully editable without any restriction and recloser will only check each value for setting range validity OR the auto-correct mode where the recloser will edit and automatically correct protection settings of its own and of other reclosers in series through the communications network and comprehensively achieve grading of all protection devices (including fuses, using fusing characteristics) in the system. ZSC can be effectively employed to achieve ‘fuse burning’ or ‘fuse saving’ stratetgy.

Cold load pick up to protects against nuisance overload tripping after a close operation has occurred to resume power supply after a power outage. This feature is

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user configurable as per the system load conditions and power outage time with programmable current multiplier and ramp up and down times.

Inrush restraint to protects against instantaneous overload tripping on inrush currents after a close operation, with user configurable inrush current multiplier and operating time settings.

Voltage reclosing control to program loop automation functionality (applicable for ring main systems and radial interconnected systems).

A detailed event log to register up to 1000 most recent events for close-open & fault protection operations, time stamped to 1ms precision. This feature provides a clear and concise field report on why the recloser has operated, the faulted phase, type of fault, level of fault current at instant of contact separation and prospective peak of fault current. The event log is viewable by uploading to a PC using the software package provided with each recloser VCB.

A change messages log which should registers up to 100 events associated with control instructions issued via man-machine local interface of control unit or laptop from local or from remote through tele-communication interface.

Fault profile data logger which should logs up to 10000 readings of fault data related to activity of protection, time stamped with an accuracy of 1 ms. Time interval between the readings is one cycle of power frequency.

Load profile data logger which should log at least 9000 readings of both single phase and three phase active and reactive power demand history, time stamped with an accuracy of 1 ms and integrated over a user configurable 5 / 10 / 15 / 30 / 60 minute period.

Measurement of instantaneous phase voltage; phase current; residual current; frequency; single phase and three phase power factor; single phase & three phase active power & reactive power and recording of single phase & three phase, active energy & reactive energy. All measurements are based on analogue inputs from current and voltage sensors and converted to true rms (harmonic-filtered) digital inputs. Overall measurement accuracy, including current and voltage sensor errors, do not exceed +/- 5% for active, reactive and total power as well as for active and reactive energy.

All protection settings, measurements and logs are easily downloadable from a laptop or PC using the software package provided with the recloser.

Protection counters to record the number of protection trips by each individual tripping element.

Lifetime counters to record the total C-O operations, the mechanical wear (displayed as a percentage of rated C-O operations life) and the maximum main contact wear on any of the three phases of VCB, computed for each phase from the contact wear consumed after each interruption and displayed as a percentage of the maximum allowed.

Communications from remote using GPRS / GSM / radio / telephone modem or converter or direct communication using DNP3 or Modbus protocols.

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SECTION 8

GUARANTEED TECHNICAL PARTICULARS (GTP)

76

LIST OF SOME OF THE APPROVED MANUFACTURES FOR DIFFERENT ITEMS

Sl No

PARTICULARS OF ITEM NAME OF SOME OF THE APPROVED

MANUFACTURERS

1 Out Door VCB (For both 11 KV & 33 KV)

ABB, Siemens, Crompton, Schneider

2 11 KV 9 unit Indoor VCB Panel ABB, Siemens, Crompton, Schneider

3 Maintenance free Battery Bank Exide, Amra Raja, HBL, Standard Furukawa

4 Battery Charger HBL , Amra Raja, PEE, Instant Solution

5 Isolator RM, Ruma, Project Electrical , APE, S&S

6 11 & 33 KV Outdoor CT & PT CGL, Laxmi , Torit, Indian Transformer, Mehru

7 Remotely operable auto recloser type VCB for 11 &33 KV

Travida, Schinder, ABB

77

8.1 GUARANTEED TECHNICAL PARTICULARS OF 33kV VACUUM CIRCUIT

BREAKER

(To be filled by bidder)

1. Name of the Manufacturer

2. Country of Origin

3. Manufacture’s type and Designation

4. Number of poles

5. Rated Voltage (KV)

6. Standards Applicable

7. Normal Current Rating

a)IEC conditions

b)Site conditions

8. Frequency in cycles per second

9. Making capacity in peak kilo-amperes

10. Breaking capacity

a) Symmetrical in KA

b) A-Symmetrical in KA

11. Three second short time current rating

12. Total Break time in milli second

a) At 10% rated interrupting capacity

b) At 30% rated interrupting capacity

c) At 60% rated interrupting capacity

d) At 100% rated interrupting capacity

13. Maximum temperature rise above ambient

a) Live parts (Degree C)

b) Enclosure (Degree C)

14. Whether suitable for three phase auto reclosing

15. Breaker

a) Opening time in milli – seconds with no current

b) Opening time in Milli-seconds at rated breaking current

c) Arcing time in milli-seconds

d) Time in milli-seconds from Arc Extinction to contact fully

open

e) Dead time in mill-seconds for three phase reclosing

f) Time in milli-second

j) From circuit energized to contacts make

ii) From contacts make to contacts fully closed

16. 1.2/50 microsecond lightening impulsive with stand voltage to earth

(in KV peak)

17. One minute power frequency dry. Withstand voltage to earth (in

KV rms)

18. One minute power frequency wet withstand voltage to earth (in KV

rms)

19. First pole to clear factor

20. Out of phase switching capability of the breaker

21. Rated out of phase breaking current

22. Switchgear component load requirement

a) Circuit breaker

i) Spring charging motor

ii) Close coils

iii) Open coils

78

iv) Heaters

b) Control cubicle

i) Relays

ii) Heaters

iii) Indications

c) Other requirements

23. Maximum line charging current that the breaker can interrupt (in

Amperes)

24. Maximum over voltage developed while breaking line charging

current

a) Supply slide (KV)

b) Line side (KV)

25. Maximum shunt capacitor bank switching capacity of breaker

(single bank MVA)

26. Maximum cable charging current breaking capacity (in Amps) and

corresponding over voltage (in KV)

a) Supply side

b) Line side

27. Short line fault current breaking capacity (KV)

28. Maximum over voltage developed while breaking magnetizing

current of transformer (KV)

29. Rated operating duty cycle

30. Minimum clearance in air

a) Between poles (mm)

b) Between live part (mm) to earth

c) Between live part to ground level (mm)

31. Creepage distance

a) To ground (mm)

b) Between terminals (mm)

32. Protected creepage distance (mm)

33. Number for breaks in series per pole

34. Type of main contacts

35. Type of arcing contacts

36. a) contact silver plated or not

b) Thickness of silver plating

c) Contact pressure

d) Electric contract resistance at 20 degree C (ohm)

37. Type of device, if any used to limit rate of rise of restriking voltage

38. Number and type of spare auxiliary switches provided

a) Normally closed

b) Normally open

39. Rated voltage of auxiliary contacts

40. Material of auxiliary contact

41. Current carrying capacity of auxiliary contacts

42. Type and make of vacuum interrupter

43. Dynamic load to be transferred to foundation

a) Co-Operation (Compressive)

b) Co-operation (Tensile)

44. Guaranteed number of operations

a) With no load current

b) With full fault current

c)Those adjustable with respect to position of main contact

45. Over all dimensions

i) Height (mm)

ii) Width (mm)

79

iii) Length (mm)

46. Weight of complete circuit breaker for foundation design

47. Seismic level for which the breaker is designed

a) Horizontal acceleration

b) Vertical acceleration

48. Height of supporting structure

49. Material of supporting structure

50. Noise level of circuit breaker at 5 meters distance

51. Whether the circuit breaker is fixed trip or trip-free

52. Short circuit type test report

53. Porcelain bushings

i) Type

ii) Dry flashover voltage

iii) Wet flashover voltage

iv) Dry 60-S withstand test voltage

v) Wet 80-S withstand test voltage

vi) Under-oil flashover or puncture withstand test voltage

(power frequency)

vii) Full wave impulse withstand test voltage

viii) Creepage distance in air (total) mm

ix) Protected creepage distance (mm)

x) Whether the bushing is suitable for outdoor installation and

extreme humid conditions

xi) Weight of the assembled bushing (Kg)

xii) Whether terminal connection for all bushing included in

scope of supply

xiii) Test (routine/type) to be conducted on the bushing

xiv) Bushing, clearance in (mm)

a) Between phases

b) Between phase to ground

xv) Performance guarantee

80

8.2 GUARANTEED TECHNICAL PARTICULARS OF 33KV and 11kV ISOLATOR

Sl. No. Particulars unit 33kV 11kV

1 Manufacturer's name & address

2 Guaranteed delivery schedule

3 System Voltage

4 Maximum permissible service voltage

5 Continuous current rating

6 Short time current rating

i) for 1 sec

ii) for 3 sec

7 Rated peak short circuit current

8 Rated peak short circuit current of earthing

blade

9 Temperature with corresponding to

i) Short time current rating

10 Fault current which can be made by earth

switch

11 Maximum current that can be safely

interrupted

between equi-potential busbars

12 Clearance in air (minimum) in mm

i) between phases

ii) between live parts and earth

iii) distance between centres of outer

stacks of insulators

13 Power frequency withstand voltage test

for complete assembled switches

i) Against ground

a) Dry, KV

b) Wet,

KV

ii) Across open contacts

a) Dry, KV

b) Wet,

KV

iii) Between phases

a) Dry, KV

b) Wet,

KV

14 Particulars of main contacts in fixed

(main and earthing switch) and moving

contacts (main and earthing switch)

i) Type

ii) Material

iii) Surface treatment

iv) contact area

15 Current density of minimum cross

section of switch blade

16 No. of operations without need for

inspection

81

17 Type and materials of connectors

18 Whether arcing contacts provided and

if yes, give materials used

19 Whether adjustable gap type arcing horns

provided and if yes, give materials used

20 Insulators

i) Creepage distance of insulators in mm

ii) Bending strength of insulators in KN

21 location and type of bearings

22 Weight of complete isolators with insulator

i) With earthing blade, Kg

ii) Without earthing blade, Kg

23 Operating efforts required for

manual operation, Kg

24 Type of interlocking between isolating

switch and earth switch

25 Details of mounting (centre to centre)

26 Guaranteed weight of mounting structure

including nuts and bolts in Kg

Auxiliary contacts

i) Normally Open (NO) contacts

ii) Normally Close(NC) contacts

27 Auxiliary DC Supply

82

8.3 GUARANTEED TECHNICAL PARTICULAR OF 33KV CURRENT TRANSFORMER

for Transformer

1.0 General

1.1 Manufacturer’s Name &

Address

2.0 Current Transformer

2.1 Standard applicable

2.2 Type

2.3 Rated voltage kV

2.4 Rated frequency Hz

2.5 No of cores

2.6 Rated primary current

2.7 Rated secondary current

2.8 Turns ratio

2.9 Rated output VA

2.10 Accuracy class

2.11 Accuracy limit factor

2.12 Instrument security factor

2.13 Maximum Knee point voltage ,V

2.14 Max. secondary resistance Ohm

2.15 Exciting current, mA

i) At knee point voltage

ii) at 50% of knee voltage

iii) at 50% of knee voltage( at

highest ratio tab)

2.16 Rated output at different tap, VA

2.17

One minute power frequency

withstand voltage, kV(rms)

i) Primary winding

ii) Secondary winding

2.18

Standard impulse withstanding

voltage of primary winding

kV(peak)

2.19 Creepage distance mm

2.20 Rated thermal current A

2.21 Rated short time current kA

2.22 Rated time for above current(sec)

2.23 Rated dynamic current kA(peak)

2.24 Class of insulation

2.25 Rated continuous current temp.

rise over ambient degree

2.26

Time period for which secondary

winding can be left open when

rated primary current is flowing

in primary winding

2.27 Quantity of oil litre

2.28 Total weight Kg

2.29 Whether PRV provided

83

8.4 GUARANTEED TECHNICAL PARTICULAR OF 33KV CURRENT TRANSFORMER for Feeder

1 General

1.1 Manufacturer’s name and address

2 Current Transformer

2.1 Standard applicable

2.2 Type

2.3 Rated voltage kV

2.4 Rated frequency Hz

2.5 No of cores

2.6 Rated primary current

2.7 Rated secondary current

2.8 Turns ratio

2.9 Rated output VA

2.1 Accuracy class

2.11 Accuracy limit factor

2.12 Instrument security factor

2.13 Maximum Knee point voltage ,V

2.14 Max. secondary resistance Ohm

2.15 Exciting current, mA

i) At knee point voltage

ii) at 50% of knee voltage

iii) at 50% of knee voltage( at highest ratio tab)

2.16 Rated output at different tap, VA

2.17

One minute power frequency withstand voltage, kV(rms)

i) Primary winding

ii) Secondary winding

2.18

Standard impulse withstanding voltage of primary winding

kV(peak)

2.19 Creepage distance mm

2.2 Rated thermal current A

2.21 Rated short time current kA

2.22 Rated time for above current(sec)

2.23 Rated dynamic current kA(peak)

2.24 Class of insulation

2.25 Rated continuous current temp. rise over ambient degree

2.26

Time period for which secondary winding can be left open

when rated primary current is flowing in primary winding

2.27 Quantity of oil litre

2.28 Total weight Kg

2.29 Whether PRV provided

84

8.5 GUARANTEED TECHNICAL PARTICULARS OF 33kV POTENTIAL TRANSFORMER

Sl

no. Specification

1.0 Manufacturer’s name and

address

1.1 Potential Transformer

1.2 Standard applicable

1.3 Type

1.4 Rated voltage kV

1.5 Rated frequency Hz

1.6

One minute power frequency

withstand voltage, kV(rms)

i) Primary winding

ii) Secondary winding

1.7

Standard impulse withstanding

voltage of primary winding

kV(peak)

1.8 Creepage distance mm

1.9 Temperature at 1.2 times rated

burden in degree C

1.10 Quantity of oil litre

1.11 Total weight Kg

1.12 Hermetically scaling

arrangements

1.13 Transformation ratio

1.14

1.15 Rated burden VA

1.16 Accuracy class

1.17 Maximum ratio error with rated

burden and at 5% normal voltage

85

8.6 GUARANTEED TECHNICAL PARTICULARS OF 11 kV OUTDOOR VACUUM CIRCUIT BREAKER

(To be filled by bidder)

1. Name of the Manufacturer

2. Country of Origin

3. Manufacture’s type and Designation

4. Number of poles

5. Rated Voltage (KV)

6. Standards Applicable

7. Normal Current Rating

a)IEC conditions

b)Site conditions

8. Frequency in cycles per second

9. Making capacity in peak kilo-amperes

10. Breaking capacity

a) Symmetrical in KA

b) A-Symmetrical in KA

11. Three second short time current rating

12. Total Break time in milli second

a) At 10% rated interrupting capacity

b) At 30% rated interrupting capacity

c) At 60% rated interrupting capacity

d) At 100% rated interrupting capacity

13. Maximum temperature rise above ambient

a) Live parts (Degree C)

b) Enclosure (Degree C)

14 Whether suitable for three phase auto reclosing

15. Breaker

a) Opening time in milli – seconds with no current

b) Opening time in Milli-seconds at rated breaking current

c) Arcing time in milli-seconds

d) Time in milli-seconds from Arc Extinction to contact fully

open

e) Dead time in mill-seconds for three phase reclosing

f) Time in milli-second

j) From circuit energized to contacts make

ii) From contacts make to contacts fully closed

16. 1.2/50 microsecond lightening impulsive with stand voltage to earth

(in KV peak)

17. One minute power frequency dry. Withstand voltage to earth (in KV

rms)

18. One minute power frequency wet withstand voltage to earth (in KV

rms)

19. First pole to clear factor

20. Out of phase switching capability of the breaker

21. Rated out of phase breaking current

22. Switchgear component load requirement

a) Circuit breaker

i) Spring charging motor

ii) Close coils

iii) Open coils

iv) Heaters

b) Control cubicle

i) Relays

86

ii) Heaters

iii) Indications

c) Other requirements

23. Maximum line charging current that the breaker can interrupt (in

Amperes)

24. Maximum over voltage developed while breaking line charging

current

a) Supply slide (KV)

b) Line side (KV)

25. Maximum shunt capacitor bank switching capacity of breaker (single

bank MVA)

26. Maximum cable charging current breaking capacity (in Amps) and

corresponding over voltage (in KV)

a) Supply side

b) Line side

27. Short line fault current breaking capacity (KV)

28. Maximum over voltage developed while breaking magnetizing

current of transformer (KV)

29. Rated operating duty cycle

30. Minimum clearance in air

a) Between poles (mm)

b) Between live part (mm) to earth

c) Between live part to ground level (mm)

31. Creepage distance

a) To ground (mm)

b) Between terminals (mm)

32. Protected creepage distance (mm)

33. Number for breaks in series per pole

34. Type of main contacts

35. Type of arcing contacts

36. a) contact silver plated or not

b) Thickness of silver plating

c) Contact pressure

d) Electric contract resistance at 20 degree C (ohm)

37. Type of device, if any used to limit rate of rise of restriking voltage

38. Number and type of spare auxiliary switches provided

a) Normally closed

b) Normally open

39. Rated voltage of auxiliary contacts

40. Material of auxiliary contact

41. Current carrying capacity of auxiliary contacts

42. Type and make of vacuum interrupter

43. Dynamic load to be transferred to foundation

a) Co-Operation (Compressive)

b) Co-operation (Tensile)

44. Guaranteed number of operations

a) With no load current

b) With full fault current

c)Those adjustable with respect to position of main contact

45. Over all dimensions

i) Height (mm)

ii) Width (mm)

iii) Length (mm)

87

46. Weight of complete circuit breaker for foundation design

47. Seismic level for which the breaker is designed

a) Horizontal acceleration

b) Vertical acceleration

48. Height of supporting structure

49. Material of supporting structure

50. Noise level of circuit breaker at 5 meters distance

51. Whether the circuit breaker is fixed trip or trip-free

52. Short circuit type test report

53. Porcelain bushings

i) Type

ii) Dry flashover voltage

iii) Wet flashover voltage

iv) Dry 60-S withstand test voltage

v) Wet 80-S withstand test voltage

vi) Under-oil flashover or puncture withstand test voltage

(power frequency)

vii) Full wave impulse withstand test voltage

viii) Creepage distance in air (total) mm

ix) Protected creepage distance (mm)

x) Whether the bushing is suitable for outdoor installation and

extreme humid conditions

xi) Weight of the assembled bushing (Kg)

xii) Whether terminal connection for all bushing included in

scope of supply

xiii) Test (routine/type) to be conducted on the bushing

xiv) Bushing, clearance in (mm)

a) Between phases

b) Between phase to ground

xv) Performance guarantee

88

8.7 GUARANTEED TECHNLCAL PARTICULARS OF BATTERY BANK

1. Battery Rating

2. Type of battery

3. Battery specification

4. Manufacturers cell designation

5. No of Cells

6. Cycle life of Battery @ 27⁰ C

7. All efficiency

8. WH Efficiency

9. Self discharge/ Week

10. Max, allowable ambient temp at which

cell can safely operate

11. Overall dimension of each cell

12. Overall weight of each cell

13. Recommended Max period of storage

14. Material of container

15. Type of separator

16. Type of +ve & -ve plates

17. Material of rack

18. Method of connection between cells

19. Recommended float charge

20. Recommended boost charge

21. Time required for boost charge from

fully discharged condition at 27⁰ C

22. Voltage ripple allowable

23. Type of connectors

89

8.8 GENERAL TECHNICAL PARTICULARS OF BATTERY CHARGER

(To be Filled in by the bidder)

1.0 General

1 1.1. Bidder’s name and address:

1.2. Manufacturer’s name and address:-

1.3. Validity of Tender

1.4. Guaranteed Delivery Schedule

2.0 Battery Charger

2 2.1 Type of charger

2.2 Type of Rectifier

2.3 Operating Voltage

2.4 Float charger rating

a. Rated DC out put

b. Out put DC voltage Adjustable Between

c. Rated output DC current

2.5 Boost Charger rating

a. Rated DC out put

b. Out put DC voltage Adjustable Between

c. Rated output DC current

2.6 Quick & Trickle Charger

a. Control Switch Type

b. Output Voltage

2.7 Voltage Regulating System

a. Automatic Voltage Regulator

i. Type & character

ii. % voltage Fluctuation of preset value

iii. % Frequency Fluctuation of preset value

iv. DC voltage limit for float charger

v. DC voltage limit for boost charger

b. Manual Voltage Regulator

i. Type & Characteristics

ii. Changeover Switch Type

c. Indicators

i. Mains on

ii. Charger Failed

iii. Rectifier element fuse blown

iv. Charger output fuse blown

v. AC input failed

2.8 Instruments & Equipments

a. Rectifier conforming to IS:

b. Construction of rectifier element

c. Measuring Instrument make, & IS: code.

d. Air break switches & fuses type

90

8.9 GUARANTEED TECHNICAL PERFORMANCE OF 33 KV/11 KV AUTORECLOSER WITH

COMMUNICATION FACILITY

Sl. Particulars Unit Data for Data for

No. 33kV AR 11kV AR

1 Type

2 No of poles

3 Service

4 Rated System Voltage kV

5 Highest System Voltage kV

6 System earthing

7 Rated Voltage of AR kV

8 Rated Continuous Current Amps

a) For lines

b) For Transformers

9 Rated Frequency Hz

10 Rated Short Circuit breaking current

( I )- 3secs - symmetrical

kA

RMS

11 Rated Short Circuit making current

kA

PEAK

12 Interrupting medium

13 Insulation medium

14 Closing mechanism

15 Opening mechanism

16 Mounting type

17 Enclosure

18

19

Duty cycle

20 Insulation level

i) Power Frequency with Stand

Voltage

kV

RMS

ii) Impulse withstand Voltage

kV

Peak

21 Minimum clearance between phases mm

Minimum clearance between phase to

earth

22

Minimum Creepage Distance (Total) mm

23

Operating mechanism:

a) Type

.c) Rated voltage of Shunt trip coil &

operating range V. DC

91

Sl. Particulars Unit Data for Data for

No. 33kV AR 11kV AR

d) Rated voltage of Closing coil &

operating range V. DC

e) No. of trip coils No

f) No. of closing coils No

g) Nos of expandable auxiliary I/O

contacts & contact rating

(Required for transformer &

Incomer AR)

Nos

AMPS

h) Minimum thickness of sheet steel

for control cabinet mm

i) Enclosure Protection

24 Reclosing

25 Support structure

(Painted / Galvanised)

26 All other parts (Painted /

Galvanised)

27 Minimum size of control wiring

(Copper) Sq. mm

28 Protection

29 a) For transformer

b) For line

Numeri

c relay

-do-

30 Measurement Digital

31 Communication Protocol

32 Communication Port

33 Supervisory

92

8.10 GUARANTEED TECHNICAL PERFORMANCE OF 11KV INDOOR VCB SWITCHGEAR PANELS

Sl. No Description Unit Particulars

1.0 Switchgear Panel-General Incomer Bus

Coupler Outgoing

1.1 Manufacturer’s name and Address

1.2 Rated Voltage

1.3 Rated Frequency

1.4 Rated Short time current and its duration

1.5 Making current (Peak)

1.6 Dynamic current rating

1.7 One minute power frequency withstand

voltage

1.8 Impulse withstand voltage

1.9 Minimum temperature rise over ambient

1.10 Interchangableility of similar equipment

1.11 Overall dimension for each switchboard

a) Length

b) Height

c) Depth

1.12 Total weight

1.13 Load for foundation design (dead weight plus

impact load)

1.14 Weight of movable unit

1.15 Truck withdrawal space required i.e. depth of

trolly when moved out

1.16 Whether fully compartmentalised design or

not

1.17 Applicable standard and degree of protection

1.18 Type of installation (indoor/outdoor)

1.19 Max. heat dissipation KW

1.20 Type of sheet steel (hot rolled or cold rolled)

and sheet thickness

1.21 Rated voltage and kW rating of space heater

1.22 Whether each switchboard is extendable on

either side

1.23 Recommended clearances

a) Front

b) Rear

c) Sides

2.0 Busbar

2.1 Conductor material

93

2.2 Conductor cross-section

2.3 Current density in Amp/mm2

2.4 Bare/painted/PVC sleeves/Epoxy encapsulated

2.5 Rated short time current and its duration

2.6 One minute power frequency withstand

voltage

2.7 Impulse withstand voltage

2.8 Rated continuous current at specified ambient

temp.

2.9 Maximum temperature rise over ambient

temperature for current rating as per 7

2.10 Minimum clearance in air

a) Between phases

b) Phases to earth

2.11 Applicable standard

2.12

Calculation establishing adequacy of cross

section and supports for short circuit and

thermal currents

2.13 Material for phase barriers

2.14 Bus joints silver plated

2.15 Material for bus bar supports

2.16 Voltage class of support and through bushing

2.17 Standard to which bus bar supports

Dimensions and mounting details

3.0 Vacuum Circuit breaker (VCB)

3.1 Manufacturer’s name and Address

3.2T Type

3.3 Short Circuit Type Tests: Certificate or report

No. (Attach photocopy)

3.4 Rated voltage and frequency

3.5 Rated short time withstand current and its

duration with breaker as housed in the panel

3.6 Making current (peak)

3.7 One minute power frequency withstand

voltage

3.8 1.2/50 microsecond Impulse wave withstand

voltage

3.9 Maximum temperature rise over ambient

specified

3.10 Interchangeability of similar equipment

3.11 Duty cycle

3.12 Whether horizontal drawout (Yes/No)

3.13 Standard to which conforms

94

3.14 Whether anti pumping device provided

(Yes/No)

3.15

Whether control circuitry suitable for

monitoring of closing and tripping circuit

(Yes/No)

3.16 Maximum design voltage

3.17 a) Symmerical breaking capacity for various

breakers (in KA and MVA)

b) Asymmeterical breaking capacity for

various breakers (in KA and MVA)

3.18 a) Rated continuous current rating for various

breakers & corresponding temperature

b) Rated continuous current rating for various

breakers at the specified ambient

temperature

3.19 Number of breaks/phases

3.20 Type of material of contacts :

a) Main

b) Arcing

3.21 Whether contacts silver are plated and

thickness of plating

3.22 Whether breaker designed to close and latch

on making current release ?

3.23 Whether trip free or fixed trip mechanically

and electrically

3.24 Type of closing

3.25 Type of tripping

3.26 Normal voltage of :

a) Closing/tripping mechanism

b) Spring charging motor

3.27 Allowable variation of voltage for above

3.28 Power required at normal voltage for

a) Trip coil

b) Closing coil

c) Spring charging motor

3.29 Weight of circuit breaker with arc

extinguishing medium

3.30 Opening time in cycles

3.31 Making time in cycles

3.32 Opening time at :

a) 10% of rated short circuit current

b) 50% of rated short circuit current

c) 100% of rated short circuit current

3.33 Heat dissipation at normal current (KW)

95

3.34 Contact Resistance at close condition (µΩ)

3.35

Minimum clearance in vacuum

Between phases

Between live parts & earth

3.36

Minimum clearance in Air

Between phases

Between live parts & earth

3.37

Whether 12 Nos. adjustable (either in ‘NO’ or

‘NC’) auxiliary contacts over and above those

required for been provided or not.

3.38 Current carrying capacity of auxiliary

switches.

3.39

No. of breaker operations necessary (before

inspection and maintenance of :

a) Switching at rated load

b) faults of 100% capacity

c) Faults of 50% capacity

d) Making under fault conditions

3.40 Accessibility of line connection

3.41 Whether terminals suitable for XLPE cable

3.42

Minimum value of pick up current for

a) Closing coil

b) Tripping coil

3.43 Schematic control diagram of circuit breaker

enclosed

3.44 Make of interrupter

3.45 Vacuum breakers (Technical details)

a) Pressure inside the interrupter mm

Hg

b) Contract wear indication provided

(Yes/No)

c) mechanical facility for checking loss of

vacuum provided (Yes/No)

d) Vacuum monitoring relay provided

(Yes/No)

e) Adequate shielding against X-Ray

radiations provided. (Yes/No)

f) Short time rating of vacuum bottle

g) No of full short circuit operations as per test

duly 1 to 5 of IEC:56, which the vacuum

bottle offered can safely withstand

h) Whether the vacuum bottles used in

incoming and outgoing panels are same or

different.

96

3.46

Switching over voltages generated by the

circuit breakers with and without surge

suppressors

4.0 Current Transformers

4.1 Manufacturer’s name and Address

4.2 Type

4.3 Rated voltage and frequency

4.4 Rated short time current and its duration

4.5 Dynamic current rating (Peak)

4.6 Rated primary current

4.7 Rated secondary current

4.8 No. of cores

4.9 One minute power frequency withstand

voltage of primary and secondary winding

4.10 Impulse withstand voltage

4.11 Rated thermal current rating (continuous)

4.12 Maximum temperature rise over ambient

4.13 Class of insulation

4.14 Standard applicable

4.15 Metering CTs

a) Ratios in line with single line diagram

b) Rated VA burden

c) Accuracy class

d) Instrument security factor

4.16 Protection CTs

4.17 a) Ratios in line with single line diagram

4.18 Magnetization curve of CT core

4.19 Total weight

4.20 Rated VA burden

4.21 Accuracy class and accuracy limit factor

5.0 Potential Transformer

5.1 Manufacturer’s name and Address

5.2 Type

5.3 Rated transformation ratio

5.4 Rated frequency

5.5 One minute power frequency withstand

voltage

5.6 Impulse withstand voltage

5.7 Maximum temperature rise over ambient

97

5.8 Interchangeability of similar equipment

5.9 Standard applicable

5.10 Class of insulation

5.11 Number of secondary winding

5.12 Winding connections

5.13 Rated secondary voltage

5.14 Rated for dual purpose of protection and

measurement

5.15 Rated output of each secondary winding

5.16 No. of auxiliary draw out contacts on VT

5.17 Rated voltage factor

a) Continuous

b) 8 hours

5.18 Temperature rise for rated output

5.19 Rated output at accuracy class 0.5/3P

a) Sec. Winding-1

b) Sec. Winding-2

5.20 c) Sec. Winding-3

5.21 Rating of HV side fuse

5.22 Characteristics of HV/LV side fuse furnished

5.23 Accuracy class

5.24 Rupturing capacity of HV/LV side fuse (to be

provided in 3 phase and single phase VTs)

5.25 Are PTs located on Bus ?

6.0 Relays (Over Current & Earth Fault)

6.1 Manufacturer’s name and Address

6.2 Type

a) Rated current

b) Current setting range in percentage of rated

current voltage at taps provided

c) Continuous rating

d) Error on different setting

e) Sensitivity

6.3 Re-setting ratio

6.4 Rated short-time thermal current/voltage for 1

sec. At different taps.

6.5 One minute power frequency withstand test

voltage

a) No. of type of contacts (normally closed or

normally open)

98

b) Rating of contacts

6.6 Operating time of instantaneous/ current

relays

6.7 Time settings of inverse or definite time

current.

6.8 Current time characteristics for inverse or

definite time current relays

6.9 Resetting time

6.10 Rated burden at lowest and highest settings

6.11 Details of series or shunt seal in units if

provided

6.12 Hand reset flag indicating provided or not

6.13 Detailed literature furnished with reference

6.14 Details of testing facilities

6.15 Detailed literature enclosed

7.0 Auxiliary Relays

7.1 Manufacturer’s name and Address

7.2 Type

7.3 Rated current/voltage and permissible

variation

7.4 Rated burden

7.5 No. and type of contacts (whether ‘NO’ or

‘NC’)

7.6 Rating of contacts

7.7 Total operating time of relays

7.8 One minute power frequency withstand

voltage

7.9 Detailed literature furnished with reference

(Yes/No)

7.10 Details of testing facilities provided

8.0 Indicating Lamp

8.1 Manufacturer’s name and address

8.2 Type

8.3 Rated voltage

8.4 Rated power consumption (watts)

8.5 Series resistor provided (Yes/No)

9.0 Indicating Meters

9.1 Ammeter

a) Make

b) Type of meter

c) Size (Square mm)

d) Scale size in degree

99

e) Accuracy

f) Range offered in line with specification

g) VA burden

h) Applicable standard

9.2 Voltmeter

a) Make

b) Type of meter

c) Size (Square mm)

d) Scale size in degree

e) Accuracy

f) Range offered in line with specification

g) VA burden

h) Applicable standard

9.3 PF meter

a) Make

b) Type of meter

c) Size (Square mm)

d) Display size

e) Accuracy

f) Range offered in line with specification

g) VA burden:-

Current Coil

Pressure Coil

h) Applicable standard

10.0 Energy Meter

a) Rating of current coil & potential coil

b) Continuous withstand capacity of the above

coils

c) Limits of error at unity pf and

i) 125/25%

ii) 10 % rated current

iii) 5% rated current

d) Limits of error at 0.5 pf(lag) and

i) 125/25% rated current

ii) 10% rated current

e) Power losses per element

i) Current Coil

ii) Potential coil

100

f) Minimum running current (Percent of

marked current)

g) Variation of voltage to cause a change of

not more than 1% at any load from full to 1/10

h) Variation of air temperatures maximum

temperature co-efficient of error in percent per

Deg. C at

i) Unity pf

ii) 0.5 pf (lag)

i) Variation dur of heating by main current in

percent at

i) Unity pf

ii) 0.5 pf (lag)

j) Variation of frequency percent error due to

5% variation in frequency

i) Unity pf

ii) 0.5 pf (lag)

k) Overload capacity

i) Continuous

ii) ½ Second

l) Excess voltage permissible for 30 minutes

m) Type of register mechanism with register

constant

11.0 Annunciation System

11.1 Size of facia

11.2 Background of facia

11.3 Size fo each window

11.4 Size of character on each window

11.5 Number of characters of above sizes that can

be accommodated per line

11.6 Colour of characters on facia

11.7 Two lamps per facia provided

11.8 Test facility for annunciation system provided

11.9 The sequence of annunciation system type to

be furnished

12.0 Control Wiring (panel)

12.1 Material and size of conductor

a) for CT & PT circuit

b) for other circuit

12.2 Number of strands in conductor

12.3 Tinned/untinned

12.4 Material of insulation and sheath

101

12.5 Voltage grade of control wiring

12.6 Colour coding of wires

a) For AC metering circuit

b) For DC control circuit

c) AC auxiliary power circuit like panel space

heater

d) Earthing

12.7 Numbered ferrules at both ends

12.8 Terminals

a) Make

b) Current rating

c) Clamp type or bolt type

d) Maximum conductor size and number of

conductor which it can receive.

e) Disconnecting type of CT circuit

f) Terminal making facility provided

g) Crimp type connectors provided at the

terminals

h) Spare terminals

102

SECTION – 9

FORMS OF BID

103

PROFORMA OF BANK GUARANTEE FOR EARNEST MONEY

(To be stamped in accordance with Stamp Act)

The non-Judicial stamp paper should be in the name of issuing bank

Ref………………………….. Bank Guarantee No…………..

Date…………………….

To

The Chief General Manager (PP&D)

Assam Power Distribution Company Ltd.

Bijulee Bhawan, Paltanbazar

Guwahati-1

Dear Sirs/ Madam,

In accordance with invitation to bid under your Bid No………………. M/s………………. having its

Registered/ Head Office at ……………..( hereinafter called the ‘Bidder’) wish to participate in the said Bid or

………………… and you, as a special favour have agreed to accept an irrevocable and unconditional Bank Guarantee

for an amount of ……………….. valid upto……………………. On behalf of Bidder in lieu of the Bid deposit

required to be made by the bidder, as a condition precedent for participation in the Said Bid.

We, the …………………. Bank at …………………… have our Head Office at…………..( local address) guarantee

and undertake to pay immediately on demand by Assam Power Distribution Company Limited, the Amount of

……………………………………………

…………………………………………………..( in words & figures) without any reservation, protest, demur and

recourse. Any such demand made by said ‘Owner’ shall be conclusive and

binding on us irrespective of any dispute or difference raised by the Bidder.

The Guarantee shall be irrevocable and shall remain valid up to and including …………. @....................... if any

further extension of this guarantee is required, the same shall be extended to such required period ( not exceeding

one year) on receiving instruction from M/s ………… … ………. on whose behalf this guarantee is issued.

In witness whereof the Bank, through its authorized office, has set its hand and stamp on this

…………… day of ………………….. 20………… at …………………………

WITNESS

……………………… …………………….

(Signature) ( Signature)

…………………….. ……………………

(Name) (Name)

……………………. ……………………

( Official Address) (Official Address)

@ This date shall be thirty (30) days after the last date for which the bid is valid.

104

PROFORMA OF BANK GUARANTEE FOR CONTRACT PERFORMANCE

(To be stamped in accordance with Stamp Act) Ref………………………….. Bank Guarantee No…………..

Date……………………. To

The Chief General Manager (PP&D) Assam Power Distribution Company Ltd. Bijulee Bhawan, Paltanbazar Guwahati-1

Dear Sir/ Madam,

In consideration of Assam Power Distribution Company Ltd., (herein after referred to as the ‘Owner’ which

expression shall unless repugnant to the context or meaning thereof include its successors, administrators and

assigns) having awarded to M/s…………… ….……………………….with registered/ Head office at ……………….(

hereinafter referred to as “ Contractor” which expression shall unless repugnant to the context or meaning thereof

include its successors, administrators, executors and assigns), a Contract by issue of Owner’s Letter of Intent

No…………… dated……………….. and the same having been acknowledged by the contractor, resulting in a

contract and contractor having agreed to provide a Contract Performance Guarantee for the faithful performance of

the entire Contract equivalent to 10(%) of the said value Contract to the Owner.

We………………………………………………………………………………………….. (Name & Address) having its

Head Office at …………………( hereinafter referred to as the “ Bank” , which expression shall, unless repugnant to

the context or meaning thereof, include its successors, administrators, executors and assigns) do hereby guarantee

and undertake to pay the owner, on demand any or all monies payable by the contractor to be extent of ₹

…………………. at any time up to ………………………..**( day/month/year) without any demur, reservation ,

contest , recourse or protest and / or without any reference to this contractor. Any such demand made by the owner

on the bank shall be conclusive and binding notwithstanding any difference between the Owner the Contractor or

any dispute pending before any Court, Tribunal, Arbitrator or any other authority. The bank undertakes not to

revoke this guarantee during its currency without previous consent of the owner and further agrees that the

guarantee herein contained shall continue to be enforceable till the owner discharges this guarantee.

The Owner shall have the fullest liberty without affecting in any way the liability of the Bank under the guarantee,

from time to time to extend the time for performance or the contract by the contractor. The owner shall have the

fullest liberty, without affecting this guarantee, to postpone from time to time the exercise of any power vested in

them or of any right which they might have against the contractor, and to exercise the same at any time in any

matter, and either to enforce or to for bear to enforce any covenants, contained or implied, in the contract between

the owner and the contractor or any other course or remedy or security available to the owner. The Bank shall not

be released to its obligations under these presents by any exercise by the owner of its liberty with reference to the

matters aforesaid or any of them or by reason of any other act of omission or commission on the part of the owner

or any other indulgences shown by the owner or by any other matter or thing whatsoever which under law would,

but for this provision have the effect of relieving the Bank.

The bank also agrees that the owner at its option shall be entitled to enforce this guarantee against the Bank as a

principal debtor, in the first instance without proceeding against the contractor and not withstanding any security or

other guarantee the owner may have in relation to the Contractor’s liabilities.

Notwithstanding anything contained herein above our liability under this guarantee is restricted to

……………………. And it shall remain in force up to an including …………………….. and shall be extended from

time to time for such period( not exceeding 1 year) as may be desired by

M/s………………………………………………………….on whose behalf this guarantee has been given.

Dated this……………………. Day of ……………………….. 20……………… at…………

105

WITNESS ……………………………. ……………………… (Signature) (Signature) …………………………… …………………….. (Name) (Name) ………………………….. …………………….. (Official address) (Official address) Attorney as per power Of Attorney No………….. Date…………………….. NB: The stamp paper of appropriate value shall be purchased in the name of issuing bank.

106

PROFORMA OF EXTENSION OF BANK GUARANTEE

Ref………………………….. Date…………………….

To

The Chief General Manager (PP&D)

Assam Power Distribution Company Ltd.

Bijulee Bhawan, Paltanbazar

Guwahati-1

Dear Sir/ Madam,

Sub: Extension of Bank Guarantee No……………….. for Rs…………………. Favouring yourselves , expiring on

…………………. On account of M/S………………………….. in respect of contract no……………………. dated

…………….. ( hereinafter called original Bank Guarantee).

At the request of M/s ……………………… we …………………… bank, branch office at ………………….. and

having its Head Office at ………………………. Do hereby extend our liability under the above mentioned Bank

Guarantee No………………… dated………………………for a further period of ……………………… ( Years/

Months) from………………….. to expire on………………….. expect as provided above, all other terms and

conditions of the original Bank Guarantee No………………………. dated ………………. Shall remain unaltered and

binding.

Please treat this as an integral part of the original Bank Guarantee to which it would be attached.

Yours faithfully

For………………………………

Manager/ Agent/Accountant …………………..

Power of attorney No……………………

Dated……………………………………

SEAL OF BANK

Note: The non-judicial stamp paper of appropriate value shall be purchased in the name of the Bank who has issued

the Bank Guarantee.

107

PROFORMA FOR MANUFACTURER’S AUTHORIZATION CERTIFICATE

Ref………………………….. Date…………………….

To

The Chief General Manager (PP&D)

Assam Power Distribution Company Ltd.

Bijulee Bhawan, Paltanbazar

Guwahati-1

Dear Sir/Madam

In accordance with invitation to bid under your Bid No. …………………. M/S…………………………..

having its Registered/Head office at……………………. ( hereinafter called the Bidder) and participating in the above

bid for supply of ……………………………………………………………………………..manufactured by us. As a

manufacturer of the said equipment, we undertake to provide warranty of the equipments to be supplied by

M/s……………………………………………for rectification/free replacement against any defect for a period of

…………. months from the date of commissioning or for a period of ………………………… months from the date

of delivery at APDCL store whichever is earlier.

Yours faithfully

Authorized Signatory

For M/s…………….

………………………