tender for overhauling 132 kv circuit breakers at 132 kv substations sahupuri under etd-iii, varanasi - major overhauling of mechanism assembly of 145 kv sf6 circuit breaker cgl make installed, work includes overhauling of control valve assembly by replacement of control valve seat, o-ring p-80 and roller c/d. overhauling of holding latch. opening of pneumatic cylinder, closing spring etc. de rusting and greasing of the same, rectification of air leakage through nrv, safety valve, opening of reservoir, cleaning of reservoir along with replacement of o6mm and 12 mm gas pipe assembly, checking and adjustment of air pressure switches and gas pressure switches, checking and retightening of all electrical connctions. measurement of closing and tripping time of circuit breaker and measurement of contact resistance of circuit breaker