REPAIR AND OVERHAULING OF 145 KV SF6 CIRCUIT BREAKER MAKE CGL INSTALLED AT 132 KV SUB STATION MORNA, UNDER ETD BIJNOR

Amount

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, Checking of control valve seal & bent O-ring, opening of anti-pumping pin assembly cleaning, de-rusting & lubrication of anti-pumping pin assembly. Checking 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 SF6 gas pressure And top-up (if required).Checking of NRV & Drain valve for air leakage with help of soap seeds. 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. Showing operation of circuit breaker with help of manual jack for checing over stroke, wipe, poles traveling etc for satisfactory operation.(All material to complete the job including SF6 gas will be provided by contractor at his own cost).

A. CB No. -70 (CGL Make) Transfer Bus Coupler B. CB No. -71 (CGL Make) 132 KV Nehtaur(400)-Morna D/C Line C. CB No. -75 (CGL Make) Bus Coupler

TIRUPATI ELECTRICALS

P&H Engineering