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 654 wave at 10KA. KV (peak) 8. Max. switching surge protective level at 1000 Amps 446 crest. KV 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 Yes velocity when it is mounted on a 2500mm tall structure. 17.0 Wind velocity the lightning arrester can withstand 300 KMPH (Approx.) without failure 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/ 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 1.02 Aluminum Alloy Chemical analysis 1.03 Copper, Brass, M.S. Stainless steel sheets 1.04 Aluminum Castings for arrester base and monitor 1.05 Cover plate (fabricated hot dip galvanizing) 1. Purity check 2. Moisture check 3. Grain size Critical Chemical Chemical Physical basis (3) samples from lot / ton analysis Critical Chemical basis (1) samples for two tonnes 1. Visual 2. Thickness 3. Formability 1. Dimension 2. Visual 3. Mechanical test 1. Visual 2. Dimension 3. Galvanizing 4. Weight of coating 5. Dip test 1.06 Gasket 1. Dimension 2. Hardness Critical Critical Visual Mechanical Visual Mechanical Visual Chemical basis (1) for every batch of tonne basis( one for every 100 nos.) basis( one for every 100 nos.) 10% PS IS Report report R* IS TR R PS TR R IS-2633 and as per Drawing As per PS and Drg. R TR R TR R
1.07 Capacitor used in Surge Monitor 1.08 Ammeter used in Surge Monitor 1.09 End Terminal Connectors 3. Ageing Critical in Lab basis( one for every 100 nos.) 1. Capacitance Critical Electrical 2. Dielectric Critical Electrical basis( one for every 100 nos.) 1. Meter Calibration 2. Surge 1. Visual 2. Dimension 3. Chemical Composition 4. Mechanical test on connectors Critical Electrical Electrical Physical Chemical Chemical Mechanical basis( one for every 100 nos.) Routine 10% basis PS ---- Customer appd. Drawing as per IS TR TR R R R 1.10 Procelain Housing 1. Visual 2. Diemension 3. Electrical withstand test 4. Porosity 5. Temp Cycle Critical Visual Electrical Mechanical 10% IS-3070 Appd. Drag. IS-5621 IS-3070 TR do-
S. No. Component and operation Characteristics Classification Types of check Quantum of check Reference Documents Format of record Agency Action by NPC 2. In process Inspection 2.01 Block 1. Dimension 2. Visual 3. 1mA DC check 4. Residual Voltage 5. Energy 6. Long duration 7. Accelerated Ageing 2.02 End fitting assembly with porcelain 2.03 Leak, Evacuation sealing 1. Dimension 2. Visual 1. Sealing Effectiveness Critical Visual Electrical Mechanical Visual 10% One from each lot 5% Routine PS 04 do- As per Drag. TR TR R TR R Critical Mechanical PS TR R
S. No. Component and operation Characteristics Classification Types of check Quantum of check Reference Documents Format of record Agency Action by NPC 3 Final Inspection 3.01 Lighting Arresters 1 Routine 1. of Reference Voltage 2. RIV 3. Residual Voltage 4. Leak Critical Electrical Routine As per IEC Latest do- TR R 2 Acceptance 1. of power frequency reference voltage in arrester units 2. Lighting impulse residual voltage test on arrester units 3. RIV on Units 4. Galvanizing 5. Dimension Electrical Mechanical Nearest higher whole no. to the cube Root of LAs LAs Supplied One No. 3 Nos. As per IEC Report HP# 2A Special acceptance test 1. Thermal Stability on Sections 3 Type 1. Dry & Wet insulation withstand test 2. Residual Voltage 3. Current Impulse withstand tests Critical Electrical Same as 3.01.2.1 above As per IEC spec. Electrical As per IEC As per IEC TR HP HP HP
4. Operating Duty HP 5. Mechanical s HP on Insulators 6. Porosity s on R Insulators 7. Production of R original Type s Certificates for Pressure Relief 8. Visual Corona R Discharge 9. Long Duration R Current on Surge Monitor 3.02 Surge Monitor 1. Routine and 1. Meter Electrical PS TR R/HP acceptance tests calibration Routine 04 2. Counter Verification 3.03 Insulating Base 1. Voltage R Withstand 2. Visual Visual 3. Wet Power Voltage Withstand Electrical One per 100 Nos. (*)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.