NIT NO. 02(M-6)ITEM NO.3

Disconnecting of HT supply from main panel after switching off 11 KV VCB discharging the supply. Complete drain out of transformer oil from transformer into empty oil drum by oil machine, dismantling of conservator tank and 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 precaution to prevent the winding damage as required, cutting of old overheated insulation of winding and reinsulation of weak point with the help of HT insulation material and proper taping etc.

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

Replacement of HV bushing with the help of skilled and trained labour with all tools and tackles etc as per site requirement.

Replacement of silica gel.

Checking & matching of control wiring of all protection relays and calibration of bucchalz relay and protection relays 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 & cable of both sides HI pot machine.

Filling of transformer oil to up to top up level as required. Make – SAVITA/Transpower

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

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

Complete cleaning and chemically washing of oily and muddy transformer body and painting of transformer with enamel paint. The work also includes the transportation of man & material at site of work .

M M Engineers