Supply of various 16.5kV/24kV/33kV CTs and PTs for IPBD LAVT and 33KV switchyard of Unit 1 to 4 and for Bethali and Hinglot River Water pump houses CTPP RVUNL Chhabra

Voltage Transformer

Single Phase Epoxy Cast Resin, Dry Type, Natural air cooled, Earthed type, Draw out type, For Indoor Use, Ref. standard: IS 3156 IL: 24/55/125 kVp Ratio: (16500/√3)/ 110V/√3/110V/√3 Burden/ Accuracy Class: Core 1 - 100 VA/0.2 Core 2 - 100 VA/3P, Insulation Class: B, Over Voltage factor-Continuous/ 30 Sec.: 1.2 times for continuous and 1.9 times for 30 Sec.

Single Phase Epoxy Cast Resin, Dry Type, Natural air cooled, Earthed type, Draw out type, For Indoor Use, Ref. standard: IS 3156 IL: 24/55/125 kVp Ratio: (16500/√3)/ 110V/√3/110V/√3 Burden/ Accuracy Class: Core 1 - 100 VA/0.2 Core 2 - 100 VA/3P, Insulation Class: B, Over Voltage factor-Continuous/ 30 Sec.: 1.2 times for continuous and 1.9 times for 8hrs

Single Phase Epoxy Cast Resin, Dry Type, Natural air cooled, Earthed type, Draw out type, For Indoor Use, Ref. standard: IS 3156 IL:36/70/170kVp PRIMARY VOLTS 33000/√3 TYPE:DES, WINDING SEC1 CONN, SECONDARY VOLTS 110/√3, VA/PH 100 V.F 1.2 Cont. & 1.9 for 8 HRS, CLASS 1.0 FREQUENCY:50 HZ, TERM a-n INSULATION CLASS:B

Current Transformer (24kV Class Bus duct)

CT Cast resin epoxy, Ring type, 1 min. HVPF withstand: 55 kV (rms) Impulse Withstand: 125 kV(Peak), Insulation Class: 24 kV Design ambient temp. : 50⁰C, Insulation class: B, Current Ratio A/A: 1000/1, Output VA: 50, Class: 5P20 CT ID (in mm.): 360 CT OD(in mm.): 575 Height (in mm.): 100

CT Type: Cast Resin Epoxy, Ring type, Nominal System voltage: 24 kV Basic insulation Level:55 kVrms/ 125 kVPeak, Insulation Class: B Short time rating:- Symmetrical: 100kA for 1 sec(Main), Momentary: 255 kA Peak, Temp rise: 40⁰C Frequency: 50Hz, Ref. Standard: IS-2705 Current Ratio: 12500/5 Output VA: 100 , Class: 0.2 S, ISF: <=5 CT ID (in mm.): 760 CT OD(in mm.): 920 Height (in mm.): 75

CT Type: Cast Resin Epoxy, Ring type, Nominal System voltage: 24 kV Basic insulation Level: 55 kVrms/ 125 kVPeak, Insulation Class: B Short time rating:- Symmetrical: 100kA for 1 sec(Main), Momentary: 255 kA Peak, Temp rise: 40⁰C Frequency: 50Hz, Ref. Standard: IS-2705 Current Ratio: 12500/5 , Knee point voltage V(>=) : 1000 V Secondary resistance at 75⁰C Ω(<=): 6 Ω Excitation current at Vk/2(<=): 150 mA Class: PS CT ID (in mm.):710 CT OD(in mm.): 900 Height (in mm.): 110

CT Type: Cast Resin Epoxy, Ring type, Nominal System voltage: 24 kV Basic insulation Level:55 kVrms/ 125 kVPeak, Insulation Class: B Short time rating:- Symmetrical: 165kA for 1 sec, Momentary: 445 kA Peak, Temp rise: 40⁰C Frequency: 50Hz, Ref. Standard: IS-2705 Current Ratio: 1000/1 Secondary resistance at 75⁰C (<=): 4 Ω Output VA: 15, Class: 5P20 CT ID (in mm.): 320 CT OD(in mm.): 520 Height (in mm.): 125

CT Type: Cast Resin Epoxy, Ring type, Nominal System voltage: 24 kV Basic insulation Level:55 kVrms/ 125 kVPeak, Insulation Class: B Short time rating:- Symmetrical: 165kA for 1 sec, Momentary: 445 kA Peak, Temp rise: 40⁰C Frequency: 50Hz, Ref. Standard: IS-2705 Current Ratio: 10000/1 Secondary resistance at 75⁰C (<=): 20 Ω Output VA: 25, Class: 5P20 CT ID (in mm.): 325 CT OD(in mm.): 565 Height (in mm.): 130

Current Transformer (33kV )

Cast resin epoxy, TYPE(DES)-33F, Nominal System voltage: 33 kV CT CORE -3 RATIO CURRENT(A) 50/1 /50/1/50/1, RATED BURDEN (VA) 15/ 15/ - CLASS OF ACCURACY 1.0/5P/PS,TYPE: WOUND, INSTRUMENT SECURITY FACTOR/ACCURACY LIMIT FACTOR ≤5/ -, IL:36/70/170kVp, RCT(75ºC)≤ Ω/ Ω/ 4Ω HSV:36kV, Vk≥ V/ V/ 160V, STC 16Ka for 1 sec, Ie AT Vk/4 ≤ mA/ mA/ 30mA, FREQ.-50 HZ, SECONDARY TERMINALS 1S1-1S2 2S1-2S2 3S1-3S2, INSULATION CLASS B

Cast resin epoxy, TYPE(DES)-33A, Nominal System voltage: 33 kV CT CORE -2 RATIO CURRENT(A) 80/1 80/1, RATED BURDEN (VA) 15 /15/ - , CLASS OF ACCURACY 0.5/ 5P20/ - , INSTRUMENT SECURITY FACTOR/ACCURACY LIMIT FACTOR ≤5/- , IL:36/70/170kVp, RCT(75ºC)≤ Ω/ Ω/ Ω HSV:36kV, Vk≥ V/ V/ V, Ith: 16Ka for 1 sec, Ie AT Vk/4 ≤ mA/ mA/ mA, FREQ.-50 HZ SECONDARY TERMINALS 1S1-1S2 2S1-2S2 3S1-3S2, INSULATION CLASS B

Cast resin epoxy, Nominal System voltage: 33 kV CT CORE -3 RATIO CURRENT(A) 100/1 / 100/1 /100/1, RATED BURDEN (VA) 30 /30/ - CLASS OF ACCURACY 1.0/ 5P20/ PS, INSTRUMENT SECURITY FACTOR/ACCURACY LIMIT FACTOR <5/ -, IL:36/70/170kVp, RCT(75ºC)≤ Ω/ Ω/ Ω HSV:36kV, Vk≥ V/ V/ V, Ith: 16Ka for 1 sec, Ie AT Vk/2 ≤ mA/ mA/ 30mA FREQ.-50 HZ, SECONDARY TERMINALS 1S1-1S2 2S1-2S2 3S1-3S2, INSULATION CLASS B

Cast resin epoxy, TYPE(DES)-33C, Nominal System voltage: 33 kV CT CORE -3 RATIO CURRENT(A) 80/1 / 80/1 /80/1, RATED BURDEN (VA) 15 /15/ - CLASS OF ACCURACY 0.5/ 5P20/ PS, INSTRUMENT SECURITY FACTOR/ACCURACY LIMIT FACTOR - ≤5/ -, IL:36/70/170kVp, RCT(75ºC)≤ Ω/ Ω/ Ω HSV:36kV, Vk≥ V/ V/ V, Ith: 16Ka for 1 sec, Ie AT Vk/4 ≤ mA/ mA/ mA FREQ.-50 HZ, SECONDARY TERMINALS 1S1-1S2 2S1-2S2 3S1-3S2, INSULATION CLASS B