WORK FOR SERVICING AND OVERHAULING OF 145 KV SF6 CIRCUIT BREAKER AT 220 KV S/S GAJRAULA UNDER ELECTRICITY TRANSMISSION DIVISION, AMROHA.UNDER ELECTRICITY TRANSMISSION DIVISION, AMROHA.

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Repair & Overhauling of 145 KV Siemens & CGL make SF6 circuit breaker by doing following work- 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 resistance, 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 checking over stroke, wipe, poles traveling etc for satisfactory operation at following S/S-

Name of feeder Make Comm. Month/ Year of manufacturing 1. 132 KV CB 784, 63MVA T/F-II Siemens 2008 2. 132 KV CB 783, 63MVA T/F-I Siemens 2008 3. 132 KV CB 74, Gajraula bay CGL 2013

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