Upgradation of 3.3 KV NGR system of Transformer (33 KV/3.3) KV by providing and fixing of resistance ,failsafe relay etc as required at Chhal OCM, Baroud OCM and Jampali OCM main substation

Amount

NOTE : i. Resistor chamber and panel should be on different unit (fixture) . ii. Panel should be equipped with ohmmeter /resistor meter (showing resistance at the time of fault and required relays) .

A. 6.6KV NGR Providing and fixing of 6.6 KV grade Neutral Grounding Resistance.Voltage rating of Transformer 33 KV/6.6 KV Technical details are as below:- a. Rtaed Voltage : 6.6 KV b.Rated Resistance:381 ohms, +/_ 10 % c. Rated Current : 10 Amp d. Time Rating: 5-10 % e. Resistor type: Non-magnetic stainless steel wire wound AISI 304 grade, 381 Ohms f. Fail Safe relay : 5 to 10 Amps time setting also provided on the relay g. Aux supply: 220 V AC

33 KV /3.3 KV Transformer NGR upgradation as per CEAR 2023 Resistance upgradation resistance value increment from 38.1 ohms to 190.5 ohms , 375 degree celcious temptrature rise sustainibility ,Non magnetic stainless steel wire wound AISI 304 GR resistor.

Calibration cost of existing fail safe relay : variable 5-10 A current with time setting aux supply 220 V AC

Providing of Potential transducer 3.3 KVgrade

Providing of Current Transformer 10/5 A

Upgradation ,calibration and retrofitting of existing NGR Panel charges

Total impact of GST for the purpose of CTC

A B ENGINEERING