TECHNICAL SPECIFICATIONS OF EXISTING LIGHTNING ARRESTORS … · TECHNICAL SPECIFICATIONS OF EXISTING LIGHTNING ARRESTORS ... in amperes for 1000 and 2000 µs As per IEC-60099-4

Annexure-1 (CC no. 77627)

TECHNICAL SPECIFICATIONS OF EXISTING LIGHTNING ARRESTORS

S. No. Description Parameter

1. Type Station class heavy duty zinc oxide gapless

2. Applicable standard IEC-60099-4 / IS:3070 part 3 (Latest)

3. Rated voltage of the arrester KV (rms) 216

4.1 Maximum continuous operating KV(rms) Voltage 184

4.2 Rated frequency 50

5. Discharge class III (Three)

6. Nominal discharge current at 8/20 microsecond wave. 10 KA

7. Front of wave protective level with microsecond steep wave at 10KA. KV (peak)

654

8. Max. switching surge protective level at 1000 Amps crest. KV

446

9. Power frequency withstand voltage of arrester insulation.

a) Dry 460

b) Wet 460

10. Impulse withstand voltage of arrester insulation.

Dry KV (peak) 1050

11. Residual voltage at KV (peak)

a) 0.5 P.U. of rated discharge current 485

b) 1.0 P.U. of rated discharge current 525

c) 2.0 P.U. of rated discharge current 600

12. Impulse current withstand

12.1 High current short duration test value KA 100

12.2 Low current long duration test value As per class-3

12.3 Virtual duration of rectangular wave 2400 microsecond

12.4 Long duration rating in amperes for 1000 and 2000 µs As per IEC-60099-4 / IS:3070 part 3

13.0 Discharge capability of the arrester KJ/KV 5KJ/KV (Minimum)

14.0 Temporary over voltage KV (peak) Withstand capability

0.1 Second 382

1.0 Second 366

10.0 Second 351

100.0 Second 336

Continues 260

15.0 Net weight of the arrester ( approx) Kgs < 350

16.0 Is the arrester designed to withstand 200 KMPH wind velocity when it is mounted on a 2500mm tall structure.

Yes

17.0 Wind velocity the lightning arrester can withstand without failure

300 KMPH (Approx.)

18. Cantilever strength of the complete arrester (min.) 350 Kg

19. Discharge counter and leakage current meter provided. Yes

20. Pressure relief device provided yes

21. Minimum Creepage distance of lightning arrester 6400 mm

22. Weather the lightning arrester assembly is designed to withstand applicable seismic load?

Yes

23. Mounting Base Bolts As Shown in drawing

24. Maximum radial distance over which pieces of lightning arrester scatter in the event of its damaged during discharge.

Falls within a distance of 1.3 mtrs. from arrester mounting

Annexure-II

COMPLIANCE FOR BIDDER

(Bidder shall mention specifications of quoted product in the table mentioned below):

Table-1

S. No. Description Bidders specification for quoted item

1. Type

2. Applicable standard

3. Rated voltage of the arrester KV (rms)

4.1 Maximum continuous operating KV(rms) Voltage

4.2 Rated frequency

5. Discharge class

6. Nominal discharge current at 8/20 microsecond wave.

7. Front of wave protective level with microsecond steep wave at 10KA. KV (peak)

8. Max. switching surge protective level at 1000 Amps crest. KV

9. Power frequency withstand voltage of arrester insulation.

a) Dry

b) Wet

10. Impulse withstand voltage of arrester insulation.

Dry KV (peak)

11. Residual voltage at KV (peak)

a) 0.5 P.U. of rated discharge current

b) 1.0 P.U. of rated discharge current

c) 2.0 P.U. of rated discharge current

12. Impulse current withstand

12.1 High current short duration test value KA

12.2 Low current long duration test value

12.3 Virtual duration of rectangular wave

12.4 Long duration rating in amperes for 1000 and 2000 micro seconds

13.0 Discharge capability of the arrester KJ/KV

14.0 Temporary over voltage KV (peak) Withstand capability

0.1 Second

1.0 Second

10.0 Second

100.0 Second

Continues

15.0 Net weight of the arrester ( approx) Kgs

16.0 Is the arrester designed to withstand 200 KMPH wind velocity when it is mounted on a 2500mm tall structure.

17.0 Wind velocity the lightning arrester can withstand without failure

18. Cantilever strength of the complete arrester (min.)

19. Discharge counter and leakage current meter provided.

20. Pressure relief device provided

21. Minimum Creepage distance of lightning arrester

S. No. Description Bidders specification for quoted item

22. Weather the lightning arrester assembly is designed to withstand applicable seismic load?

23. Mounting Base Bolts (To be provided by bidder). If Provided drawing of base is not matching with existing base, then bidder shall arrange the interconnection base, matching with existing foundation base.

24. Maximum radial distance over which pieces of lightning arrester scatter in the event of its damaged during discharge.

Other specifications to be complied by bidder: Bidder should mention details of Compliance of the points mentioned item sr. no. i) to vi) in the Table-2

mentioned below:

Table-2

S. No. Description of other specification Bidders compliance for specification

1 All routine/ Acceptance / Special Acceptance and Type tests will be carried out as per Latest version and amendments of IS /IEC, which are given at Sr. No. 3 of Tentative QA plan in Annexure-IX.

Note: The manufacturer should carry out type test or submit valid test report of type test for lightning arrester being offered for supply. The type test reports should be witness or test should be carried out at NABL accredited/ OEM test laboratory.

2 The offered equipment have to be designed, manufactured and tested as per relevant IS/IEC with latest amendments.

3 Three nos. copies of Instruction Manuals (for operation, maintenance, erection, shipping and storage) in Hindi / English language shall be supplied (Soft and Hard copy), one month prior to the dispatch of the equipment.

4 Has bidder uploaded his offered material`s Dimensional Drawing for Lightning Arrester & Insulating base?

5 Whether the offered drawing of the insulating base is matching with existing insulating base?

6 Has bidder uploaded his offered material`s Dimensional Drawing for Grading Ring?

7 Has bidder uploaded his offered material`s Dimensional Drawing for Terminal connectors?

8 Has bidder uploaded his offered material`s Dimensional Drawing for Surge Monitor cum operation counter & leakage meter?

9 Has bidder uploaded his offered material`s Dimensional Drawing for Name plate details?

10 Has bidder uploaded his offered material`s Dimensional Drawing for Cut way section?

11 Has bidder uploaded his offered material`s Dimensional Drawing for Voltage Time curve?

12 Tentative QA plan is attached in Annexure-IX. However bidder will submit detailed QA plan for approval after PO placement and before manufacturing.

Annexure-IX

Quality assurance programme Zinc oxide surge arresters, insulating base and surge monitors

S. No. Component and operation

Characteristics Classification Types of check

Quantum of check

Reference Documents

Format of record

Agency Action by NPC

1. Raw materials

1.01 Zinc oxide and other additives

1. Purity check Major Chemical On sample basis (3) samples from lot / ton

PS Test Report

OEM R*

2. Moisture check

Major Chemical

3. Grain size analysis

Critical Physical

1.02 Aluminum Alloy Chemical analysis

Critical Chemical On sample basis (1) samples for two tonnes

IS Test report

OEM R

1.03 Copper, Brass, M.S. Stainless steel sheets

1. Visual 2. Thickness 3. Formability

Major Major Major

Visual Measurement Mechanical

On sample basis (1) for every batch of tonne

IS TR OEM R

1.04 Aluminum Castings for arrester base and monitor

1. Dimension 2. Visual 3. Mechanical

test

Major Critical Critical

Measurement Visual Mechanical

100% 100% On sample basis( one for every 100 nos.)

PS TR OEM R

1.05 Cover plate (fabricated hot dip galvanizing)

1. Visual 2. Dimension 3. Galvanizing 4. Weight of

coating 5. Dip test

Major Major Major

Visual Measurement

100% 100% On sample basis( one for every 100 nos.)

IS-2633 and as per Drawing

TR OEM R

1.06 Gasket 1. Dimension 2. Hardness

Major Major

Measurement Chemical Test

10% On sample

As per PS and Drg.

TR OEM R

3. Ageing Test Critical in Lab basis( one for every 100 nos.)

1.07 Capacitor used in Surge Monitor

1. Capacitance Measurement

2. Dielectric Test

Critical Critical

Electrical Electrical

100% On sample basis( one for every 100 nos.)

PS TR -do-

OEM R

1.08 Ammeter used in Surge Monitor

1. Meter Calibration

2. Surge Test

Major Critical

Electrical Electrical

100% On sample basis( one for every 100 nos.)

-do- -do-

-do- -do-

OEM R

1.09 End Terminal Connectors

1. Visual 2. Dimension 3. Chemical

Composition 4. Mechanical

test on connectors

Major -do- -do- -do-

Physical Chemical Chemical Mechanical

Routine 10% On sample basis -do-

---- Customer appd. Drawing as per IS

TR -do- -do- -do-

OEM R

1.10 Procelain Housing

1. Visual 2. Diemension 3. Electrical

withstand test

4. Porosity Test 5. Temp Cycle

Test

Critical Major -do- -do- -do-

Visual Measurement Electrical Mechanical -do-

100% 10% 100% On sample -do-

IS-3070 Appd. Drag. IS-5621 IS-3070 -do-

TR do- -do- -do- -do-

OEM



Quantum of check

Reference Documents

Format of record


2. In process Inspection

2.01 Block 1. Dimension 2. Visual 3. 1mA DC check 4. Residual

Voltage Test 5. Energy Test 6. Long duration 7. Accelerated

Ageing Test

Major -do- Critical -do- -do- -do- -do-

Measurement Visual Electrical -do- -do- -do- -do-

10% 100% One from each lot -do- -do- -do-

PS 04 do- -do- -do- -do-

TR -do- TR -do- -do- -do-

OEM R

2.02 End fitting assembly with porcelain

1. Dimension 2. Visual

Major -do-

Mechanical Visual

5% Routine

As per Drag. -do-

TR OEM R

2.03 Leak Test, Evacuation sealing

1. Sealing Effectiveness

Critical Mechanical -do- PS TR OEM R



Quantum of check

Reference Documents

Format of record


3 Final Inspection

3.01 Lighting Arresters

1 Routine Test 1. Measurement of Reference Voltage

2. RIV Test 3. Residual Voltage

Test 4. Leak Test

Critical -do- -do- -do-

Electrical -do- -do- -do-

Routine -do- -do- -do-

As per IEC Latest do- -do- -do-

TR -do- -do- -do-

OEM R

2 Acceptance Test

1. Measurement of power frequency reference voltage in arrester units

2. Lighting impulse residual voltage test on arrester units

3. RIV Test on Units 4. Galvanizing Test 5. Dimension

-do- -do- -do- Major -do-

Electrical -do- -do- Mechanical Measurement

Nearest higher whole no. to the cube Root of LAs LAs Supplied -do- One No. 3 Nos.

As per IEC -do- -do-

Test Report

OEM HP#

2A Special acceptance test

1. Thermal Stability Test on Sections

Critical Electrical Same as 3.01.2.1 above

As per IEC spec.

-do- OEM -do-

3 Type Test 1. Dry & Wet insulation withstand test

Major Electrical As per IEC As per IEC TR OEM HP

2. Residual Voltage Test

-do- -do- -do- -do- -do- OEM HP

3. Current Impulse withstand tests


4. Operating Duty Test


5. Mechanical Tests on Insulators


6. Porosity Tests on Insulators

-do- -do- -do- -do- -do- OEM R

7. Production of original Type Tests Certificates for Pressure Relief Test


8. Visual Corona Discharge Test


9. Long Duration Current Test on Surge Monitor


3.02 Surge Monitor 1. Routine and acceptance tests

1. Meter calibration

Major Electrical Routine

PS 04

TR OEM R/HP

2. Counter Verification

-do- -do- -do- -do- -do- OEM

3.03 Insulating Base 1. Voltage Withstand Test

-do- -do- -do- OEM R

2. Visual -do- Visual 100% -do- -do- OEM

3. Wet Power Voltage Withstand Test

-do- Electrical One per 100 Nos.

-do- -do- OEM

(*)R - Review of test certificates by bidder and record verification by NPC

(#)HP-Hold point tests to be conducted in presence of NPC & clearance shall be obtained before further proceeding.