ELECTRICAL WORK

Amount

Following work is to be carried out-Dismantling of 145 KV SF6 CBs including opening of nuts, bolts, jumpers, cable connection, earthing etc and shifting of the same from site to JE's store. Safely erection of new 145 KV CB including shifting of breaker from store to eretion site including proper termination after preperation of cable schedule. Work also includes making of earthing, jumpers etc. required for proper completion of Job satisfactorily. (CB No. - 75)

Providing & fixing of 145 KV Bi-metallic Breaker clamp for above work.

Repair & overhauling of 145 KV CB no 781(40MVA T/F-I) installed at 132 KV S/S Dasna work includes Opening/Dismantling of control valve assembly, cleaning of cap seal cylinder, removal of defective roller, re-fixing of new roller, reassembly of control valve assembly in mechanism, Replacement of control valve seal & bent O-ring, opening of anti-pumping pin assembly cleaning, de-rusting & lubrication of anti-pumping pin assembly. Replacement of spring in anti pumping. opening and cleaning of closing spring, shock absorber, pneumatic cylinder, cleaning of piston & cylinder including their assembly, replacing of oil & O-ring, Opening and reassembling of trip coil assembly after cleaning of its various parts including measurement of reistance, adjustment of trip coil gap. Checking of NRV & Drain valve for air leakage with help of soap seeds. Replacement of NRV and Drain Valve. Checking of air switch i.e. governor switches, low air pressure alarm switch including adjustment. Checking of gas density switch including all adjustment. De-rusting lubrication of horizontal rod assembly & its various linkages, cleaning of bar pins,replacement of cerclip. Show operation of circuit breaker with help of manual jack for checing over stroke, wipe, poles traveling etc for satisfactory operation.

Supply of Spring charging Motor(230VAC) suitable for 36 KV VCB of Stelmec/BHEL/Siemens/Shreem make.

J S CONTRACTORS

TIRUPATI ELECTRICALS