NIT No. 23/EE(EM)M-10/(23-24)Item No-6

Disconnecting of ht supply from main ht panel after proper switching of 11 KV VCB discharging the supply. Complete drain out of transformer oil from transformer to empty oil drum by oil machine, dismantling of conservator tank all protection relays cable end boxes vent pipe and other items as required.

Cleaning of transformer oil tank and removing of sludge settled in the bottom with the help of vacuum pressure cleaning machine thoroughly, cleaning of core and winding of transformer with hot oil and proper safety precaution to prevent the winding damage as required, cutting of old overheated insulation of winding and reinstallation of weak point with the help of HT insulation material and proper tapping etc.

Replacement of top cover gasket, vertical cover gasket and missing hardware to stop the oil leakage

Replacement of silica gel

Repairing of tape changer

Checking and matching of control wiring of all protection relays and calibration of Buchholz relay and protection relay testing the same

Complete assembling of transformer cleaning of complete transformer tightening of all connection of incoming and outgoing side and testing & checking of IR test with megger of winding and cable of both sides with HI pot machine.

Filling of transformer oil up to top up level as required to make power

P/Fixing of winding protection pad

Repair of cooling fins, replacement of cooling fins gasket and oil seal for stopping the leakage

Dehydration & filtration of complete transformer oil and checking the die-electric strength up to 50 KV at site as required

Complete cleaning and chemically washing of oily and muddy transformer body and painting of transformer with enamel paint

M.B. Enterprises