NIT 7 (24-25)HP-II Item No.6

Disconnection of HT supply from main HT panel after proper switching off 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 pipes 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 precautions to prevent the winding damage as required, cutting of old overheated insulation of winding and re-insulation of weak point with the help of HT insulation material and proper taping etc.

Cleaning of winding with DC 2-26.

Replacement of top cover gasket vertical vent gasket & missing hardware to stop the oil leakage.

Replacement of silica gel.

Repair of tape changer.

Repairing of LT copper bolt and pam, remetalling and finishing the same as per original shape and size.

Checking & matching of control wiring of all protection relays and calibration of bucchlaz relay and protection relays testing the same.

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

P/fixing of winding protection pad.

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

Filling of T/oil to up to level as required. Make:- Savita / Power.

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.

Insulating the bus bar with epoxy paint.

M.B. Enterprises