NIT 7 Item 7

Renovation of Bharat Bijlee Ltd. Make 1250 KVA transformer No. 1 installed at Raw Water Pump House-II. With following works:- Disconnecting 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 precaution 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 salica gel.

Repairing of tape changer

Repairing of LT Copper bolt and Pam, remettaling 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 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 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 top up level as required to 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