Name of Work:Repairing and dehydration of 630 KVA transformer No 1 and2 at Nehru Place BPS under Kalkaji Constituency AC-51.
Sl. No.
Item Description
1
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.
2
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.
3
Replacement of top cover gasket vertical vent gasket & missing hardware to stop the oil leakage.
4
Replacement of silica gel.
5
Checking and matching of control wiring of all protection relays and calibration of buchholz relay and protection relay testing the same.
6
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.
7
Filling of transformer oil up to top up level as required to make power.
8
P/Fixing of winding protection pad.
9
Repairing of tape changer.
10
Repair of cooling fins , replacement of cooling fins gasket and oil seal for stopping the leakage.
11
Dehydration & filtration of complete transformer oil and checking the die electric strength up to 50 KV at site asrequired
12
Complete cleaning and chemically washing of oily and muddy transformer body and painting of transformer with enamel paint.
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