For the work of attending gas leakage of SF 6 CB of 132 KV Dobhi TSS bay at 132 KV Sub Station Lalganj under ETD Azamgarh

To attend SF-6 gas leakage of 145 KV SF-6 CB ( Siemens make) Sl No 16039 Type 3AP1FC-1S) of 132 KV Dobhi TSS bay at 132 KV S/S Lalganj :- a. Detect gas leakage by SF-6 gas leakage detector. b. Extract SF-6 gas from pole units by help of SF-6 extraction plant and keep it into empty SF-6 gas cylinder. C. Dismantle all top covers from pole units and opening of fixed contact chamber from pole units. D. Cleaning of all fixed & moving contacts, polishing the contacts and applying micro carbon grease on contact surface. E. Replace pole top cover O ring P-170, absorbent and re-fitting the same. F. Apply vacuum in all poles by help of vacuum pump upto spedified valve and keep it for 4/5 hour & check no loss of vacumm. G. Complete overhauling of spring charging mechanism assembly cleaning & lubrication. H. Dismantling of close & trip coil assembly, opening its parts cleaning, lubricating and adjustment of air gas of this plunge. Checking lectrical connection in the marshalling box and tightening all electrical connection. J. Check close/trip operation of this breaker satisfactory. K Check close/ trip timing by ditital timer. K. SF6 gas filing in all poles at desired level for satisfactory. Completion of work.

Replacement of main NRV with pipeline ( if required) work consist of dismantling of main NRV with pipe line and replace it with new one & fittings at its original place in C.B.