NORTHERN POWER DISTRIBUTION COMPANY OF A.P. LIMITED.

WARANGAL – 506 004.

From ToThe Chief General Manager, M/s.P&O/ NPDCL,H. No. 1-1-504,Opp. REC Petrol Pump, Chaitanyapuri,Hanamkonda, Warangal – 506 004.Ph. No. 0870-2461507.Fax No. 0870-2461519.

Lr. No. CGM/P&O/NPDCL/WGL/P1/OT-155/04-05/D. No. , Dt. - -2004.

Sir,Sub:- NPDCL – Procurement of 9KV 5KA Lightning Arresters (Line Type)

against tender specification No. CGM/ NPDCL/ OT-155/04-05 – Reg.

Ref:- Your Letter No. _________________________________.

* * *

1. The receipt of Demand Draft No. __________ Dt. __________ for Rs.

_______ furnished by you towards the cost of specification No.CGM/NPDCL/OT-

155/04-05 is hereby acknowledged.

2. A copy of the Tender Specification No. CGM/NPDCL/OT-155/04-05 for

procurement of 9KV 5KA Lightning Arresters (Line Type) is enclosed herewith

3. For the above item, you are requested to quote your lowest rate for

supply of the materials and quantity as per delivery schedule indicated in

Form -III B.

Yours faithfully,

Encl: As above.CHIEF GENERAL MANAGERP&O/ NPDCL/ WARANGAL

NORTHERN POWER DISTRIBUTION COMPANY OF A.P. LIMITED

WARANGAL – 506 004.

SPECIFICATION NO. CGM/NPDCL/OT-155/04-05.

Details of Tender

1. Plant/Equipment/Material :

9KV 5KA Lightning Arresters (Line Type)a). Polymericb). Porcelain

2. Cost of Specification : Rs.2,240/-

3. Bid Security :2% of Total Ex-works Value of the Material Offered

4. Contents of the specification :

1. General Terms and Conditions2. Financial Terms and Conditions3. Form – IIIA4. Schedules A to G5. Technical Specification6. Schedule of Materials7. Form – IIIB8. Annexure

5. Officers to whom the Bid shall be Addressed :

The Chief General Manager,P&O/ NPDCL, H. No. 1-1-504, Opp. REC Petrol Pump, Chaitanyapuri,Hanamkonda, Warangal – 506 004.

6. Superscription on the Bid Cover :As per Clause 1.12.2 of Section-I General Terms

7. Last Date and Time for Receipt of Tenders : 28-04-2004 upto 13.00 Hrs.8. Date and Time of Opening : 28-04-2004 at 15.00 Hrs.

9. Place of Opening of Bids :

The Chief General Manager,P&O/ NPDCL, H. No. 1-1-504, Opp. REC Petrol Pump, Chaitanyapuri,Hanamkonda, Warangal – 506 004.

10.

Preferred Delivery Time :As indicated in the Schedule of Materials and Form – III B

Whether the Quotation is Single Part/ Two Part

: Single Part

Note: i). Northern Power Distribution Company of A.P. Limited, Warangal (APNPDCL) is an Independent Distribution Company covering the Districts of Warangal, Karimnagar, Khammam, Nizamabad & Adilabad and successful bidder will be receiving Purchase Orders in the name of APNPDCL.

ii) Offers of the manufacturers / registered vendors with APTRANSCO, APNPDCL, APCPDCL APSPDCL & APEPDCL shall only be considered.

CHIEF GENERAL MANAGER

P&O/ NPDCL/ WARANGAL

Ph. No. 0870-2461507.Fax No. 0870-2461519.

SECTION – III

TECHNICAL

9KV METAL OXIDE LIGHTNING ARRESTERS (LINE TYPE)

1.0. SCOPE:

The Specification cover design, manufacture, testing before despatch, supply and delivery of 9KV 5KA Line Type Metal Oxide Lightning Arresters for protection of Power Transformers, Substation equipments on 11KV Three Phase, 50 Cycle A.C System for outdoor installation.

2.0. STANDARDS:

Unless otherwise modified in this specification, the Lightning Arresters shall conform in all respects to IS-3070/1985, Part-I, IEC-99-4/1991 (latest version). The tenderers shall go through the above IS/ IEC thoroughly before making their offers.

3.0. NORMAL SERVICE CONDITIONS:

The Lightning Arresters manufactured in accordance with this specification shall be suitable for operation when installed outdoors and exposed to direct sun under the normal service conditions.

4.0. RATINGS:

The lightning Arresters shall be of the following Ratings.

Station Type

a). Voltage 9 KV

b). Nominal Discharge Current having 5 KA 8/20 micro sec. wave

c). Frequency 50 Hz

d). System Voltage 11 KV

5.0. PERFORMANCE CHARACTERISTICS:

The Lightning Arresters shall meet performance characteristics as per IS-3070/Part-I/ 1985 and IEC-99-4/1991.

6.0. GENERAL REQUIREMENTS:

6.1. The insulating casing of the arrester shall be made of brown glazed Electrical Porcelain free from cavities or other flaws etc., and properly vitrified.

6.2. The said design shall be such as to minimize surface contamination by natural action of wind and rain as much as practicable.

6.3. The creepage distance shall be large as to ensure that the resulting surface contamination in the specified weather conditions do not adversely affect the arrestor gap voltage grading and reduce the 50 Hz gap break down voltage

6.4. The non-linear resistance blocks shall be made of material which when subjected to extreme weather conditions encountered in the tropics will have non-ageing characteristics and stable thermal properties.

6.5. The radio interference level for the arrestor shall be negligible.

6.6. The arrestor shall withstand low magnitude current surges of long duration resulting from switching surge or accumulation of static charges from atmosphere.

6.7. The Arresters shall have safety devices to avoid hazards in the event of failure of the unit under extremely unfavorable conditions.

6.8. The protective characteristics of the arresters offered shall be clearly specified in the schedule of guaranteed technical particulars.

6.9. Each individual unit shall be hermetically sealed and fully projected

against ingress of moisture. The hermetical seal shall be effective for the entire life time of the arrester. The tenderer shall furnish sectional view of the arrester showing details of sealing employed and the protective device provided.

7.0. TESTS:

The following tests shall be carried out on the Lightning Arresters in accordance with the IS 3070 (part I)/1985 and IEC 99-4/1991.

A). Type Tests:

i). Voltage Withstand Tests of Arrestor Insulationii). Residual Voltage testiii). Current impulse withstand testiv). Operating Duty Testv). Pressure Relief Test (when the Arrestor if fitted with a Pressure Relief Device)vi). Temperature Cycle Test on Porcelain Housingvii). Porosity Tests on Porcelain Componentsviii). Galvanizing Test on Metal Partsix). Visual Examination of Porcelain Housing.

B). Routine Tests:

i). Visual Examination Test on Porcelain Housingii). Measurement of Reference Voltage Testiii). Residual Voltage Testiv). Partial Discharge Testv). Leakage Current of MCDVvi). Sealing Test for Arresters

C). Acceptance Tests:

i). Visual Examination Testii). Measurement of Reference Voltage Testiii). Residual Voltage Testiv). Partial Discharge Testv). Leakage Current Test at MCDVvi). Porosity Testvii). Galvanising Test

8.0. TYPE OF MOUNTING:

8.1. The necessary Bolts, Nuts and Clamps etc are to be supplied for mounting the Lightning Arrester on Channel/ Distribution Transformer. The Bolts, Nuts and Clamps etc., shall be suitable as per IS-2629.

8.2. Terminal Connectors

The Arresters shall be provided with suitable terminal connectors, suitable ground terminal connectors shall also be provided.

8.3. All housings shall be free from lamination cavities or other flaws affecting the maximum level of mechanical and electrical strengths. The housing shall be well vitrified and non porous.

8.4. The petticoat shall be preferably of self cleaning type. The details of the housing such as height, angle of inclination shape of petticoats gap between petticoats etc., shall be indicated by the tenderer in his offer in the form of a detailed drawing.

8.5. The arrester shall be provided with terminal connectors suitable for 20,30,50,80 and 100 Sq.mm A.C.S.R or equivalent A.A.A Conductor. Suitable ground terminal connecter shall also be provided. Actual requirement of connector shall be indicated by the purchaser during placement of order.

9.0. The Arrester for 11KV Systems should have a suitable pressure relief system in order to avoid damage to its housing. The arrester shall be provided with a suitable disconnecting device which shall be connected in series with the ground lead and shall not effect the sealing system of the disconnector.

10.0. DRAWING:

The bidder shall furnish four copies each of the following drawings with the tender in addition to descriptive literature for each type of Arrester.

a). General outline drawing showing plan, elevation and end view dimensions,

b). Drawing showing minimum clearance in relation of the adjacent ground metallic structure

c). Sectional view of Arrester.

11.0. MARKING:

11.1. Each Lightning Arrester shall be provided with a nameplate or plates legibly and indelibly marked with the following information.

a). Rated Voltage

b). Continuous Operating Voltage

c). Nominal Discharge Current at Rated Frequency

d). Long Duration Discharge Class (for 5000A)

e). Pressure Relief Class

f). The Manufacturer’s Name, Sl.No and Trademark, Type and Identification.

g). The Year of Manufacture

h). Number and Order of the Assembly of Units (if Arrester Consists of more than one Unit)

i). The Lightning Arrester may be Marked with ISI/ ISS Certification Mark.

j). Each Demountable Section of Single pole Arrestor shall be Provided with Non-rusting Nameplate for the purpose of proper Identification Mark.

12.0. PACKING:

The Lightning Arrester shall be packed in wooden crates. Although the method of packing is to the discretion of the manufacturers, it should be robust enough for rough handling, for transportation by Rail on bumpy area Road.

13.0. INSPECTION:

13.1. All the routine tests shall be conducted at the time of inspection. The inspection shall be made at the place of manufacturing unless

otherwise especially agreed upon by the manufacturer and purchaser at the time of purchase. The manufacturer shall offer the inspector representing the purchaser all reasonable facilities, without charge, to satisfy him that the material is being furnished in accordance with this specification.

13.2. The purchaser has the right to have the tests carried out at the suppliers cost by an independent agency whenever there is dispute regarding the quality of supply.

14.0 GUARANTEED TECHNICAL PARTICULARS:

The Bidder shall furnish the Technical Particulars as per Annexure and submit the same with the Tender.

15.0. SCHEDULE OF REQUIREMENT, DESIRED DELIVERY AND PRICES:

15.1. The schedule requirements and desired delivers are indicated in Section-IV.

15.2. The schedule of prices shall be indicated as per Form III-B.

15.3. The prices shall be firm.

CHIEF GENERAL MANAGER

P&O/ NPDCL/ WARANGAL

GUARANTEE TECHNICAL PARTICULARS

NPDCL TENDER SPECIFICATION NO. OT- 155/04-05.

1. Name of the Manufacturer :2. Type :3. Model (Drg No.) :

4. Number of Units :

5. Rated Voltage KV rms

:

6. Max. Continuous Operating Voltage KV rms

:

7.Nominal Discharge Current (8/20 Micro Seconds)

KA :8. Max. Residual Voltage for Discharge Current 8/20

Micro Second Wavei). 1500 A

KVP:

ii). 2500 AKVP

:

iii). 5000 AKVP

:

iv). 10000 AKVP

:

9.High Current 4/10 Micro Second Wave Test Value

KA:

10.

Long Duration Current Tests

i). Current Peak Amps :

ii). Virtual Duration, Microsec. :

11.

Pressure Relief Device :

12.

Weight of Complete Unit Kgs :

13.

Height of Complete Unit from Base of the Line Side

mm:

14.

Min. Recommended Spacing between arresters centre to centre mm :

15.

Clearance Required from grounded eqpt at various heights of LA Unit

mm:

16.

Earthing Arrangement Provided for Earthing Side of LA(s)

:

17.

Mounting Flange Dimensional Details :

18.

Equipment to be Protected KVP :

19 System Neutral Condition :

.20.

Indoor or Outdoor Installation :

Section – IV

SCHEDULE OF MATERIALS

Sl. No.

Description of MaterialsQty. in

Nos.

Free at Destination

Stores

1.

9KV–5 KA Metal Oxide Distribution Class (Line Type) Single Phase Lightning Arresters conforming to IS 3070 Part–I of 1985, IEC 99-4/1991 (Latest Version) suitable for protection of Distribution Transformers and Overhead Lines of 11KV Three Phase 50 c/s with solidly earthed neutral, complete with clamping terminals and suitable for galvanized mounting brackets. The bolts, nuts, springs & plain washers for the above should be preferably stainless steel.

a). Polymeric b). Porcelain

15,000

35,000

To any District

Stores in APNPDCL

NOTE:-

1. Free at Destination Stores rates clearly indicted Freight and Insurance charges shall only be quoted.

2. Tenders giving prices F.O.R. Loading Station will be liable for rejection the tenders shall not insist on despatches in full truck loads.

3. Desired Delivery: The delivery of materials shall commence in one month from the date of receipt of the Purchase Order and shall deliver @ 10,000 No’s per month.

4. The proforma credit available to the supplier on the purchase of inputs (raw materials) consequent to the introduction of Modvat scheme effective from 01-03-86 may be taken into account while quoting the prices. The Duties and Taxes, if any payable extra may be stated.

5. The purchaser reserves the right to vary the quantities before

and after placing the Purchase Order.

6. Only FIRM prices may be quoted.

CHIEF GENERAL MANAGER P&O/NPDCL/WAR

ANGAL

FORM – III B

SPECIFICATION NO. CGM/NPDCL/OT-155/04-05.

SCHEDULE OF QUANTITY AND PRICE

Sl. No.

Description of Materials

detailed in Section-III and

Section – IV

Qty.On

EnquiryNos.

NPDCLDeliverySchedule

QtyOffered by the

Tenderer

WhetherFirm or variable

Free at Destination Stores

Excise Duty

Sales Tax

Total value per unit

Discount if any

Remarks

Ex-Works prices per

unit including packing

Forwarding freight and insurance

1 2 3 4 5 6 7 8 9 10 11 12 13

1.

9KV 5KA Lightning Arresters

(Line Type)a). Polymeric b). Porcelain

15,00035,000

The delivery of materials shall

commence in one month from the

date of receipt of the Purchase

Order and shall deliver @ 10,000 No’s per month.

Note: 1. The Prices shall be Firm.2. Columns 1 to 4 are to be filled in by the APNPDCL and the remaining columns are to be filled by the tenderer.

SIGNATURE OF THE TENDERER