Name of Work:Dehydration overhauling of 2500 KVA Transformer No.1 installed at New Avantika BPS
Sl. No.
Item Description
1
Dismantling of 11 / 0.4 K V power supply of transformer after draw out the VCB from the respective chambers by an expert person from HT panel & transformer
2
2Dismantling the complete transformer. Removing the top cover, oil tank, silica jel breather and fins etc. lifting the core and coils from the transformer tank.
3
Debrazing of connections, dismantling of old winding from the transformer core. dismantling of damaged core punching from the T/r , straightening, smoothening of .damaged core punching cleaning of old varnish chemically and phosphating treatment ofall the core punching F class core plate varnish coating in automatic varnish coating tunnel type temperature controlled conveyorised baking oven uniform thickness test on varnishedand baked core punching. Assembling of core punching in T/r by staggering repressing hydraulically, locking of complete assembled T/r core
4
Rewinding of 11 K V HT winding limbs, removing the burnt winding. Providing the new DPC copper strips and making the new HT coils as per original. Fixing the coil in transformer core with proper HT insulation. Making the connection and brazing the same with silver mixed copper rod and insulation with HT insulation Varnishing the HT winding with Dr.Beck oil proof varnish and baking the same.
5
Re-insulation of 0.4 K V winding limbs, Annealing and cleaning the copper strips, Re-insulation of copper strips with craft paper tape and making the coils as per original shape Fixing the coils in transformer core with proper LT insulation. Making the connection and brazing the same with silver mixed copper rod and insulation with LT insulation varnishing the HT winding with Dr, Beck oil proof varnish and baking the same
6
Fixing the core and coil in the transformer tank with safe and sound condition. Replacement of top cover gasket and insulator gasket oil seal for stopping the leakage
7
Repairing of tape changer
8
Repairing of LT Copper bolt and Pam, remettaling and finishing the same as per original shape and size
9
Repair of cooling fins, replacement of cooling fins gasket and oil seal for stopping the Leakage
10
Filling the new transformer oil make Savita
11
Dehydration of transformer oil
12
Assembling the complete transformer and installation the same and testing on load at site
13
Transformer 1ifting & lowering with the help of hydra and heavy loader labour.
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