Name of Work:- Repairing/Rewinding of Transformer No. 2 at Jagriti SPS.
Sl. No.
Item Description
1
Dismantling of 11KV/415V power supply of transformer after draw out the VCB from the respective chambers by an expert person from HT panel & transformer.
2
Dismantling 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 transformer, straightening, smoothening of damaged core punching cleaning of old varnish chemically and phosphating treatment of. all the core punching F class core plate varnish coating in automatic varnish coating tunnel type temperature controlled conveyorized baking oven uniform thickness test on varnished. and baked core punching. Assembling of core punching in transformer by staggering repressing hydraulically, locking of complete assembled transformer core.
4
Rewinding of 11 KV 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 415V 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.
7
Replacement of top cover gasket and insulator gasket oil seal for stopping the leakage. Replacement of silica jel.
8
Repairing of tape changer.
9
Filling the new transformer oil make Power.
10
Dehydration of transformer oil.
11
Assembling the complete transformer and installation the same and testing on load at site.
12
Transformer lifting & lowering with the help of hydra and heavy loader labour. Please Enable Macros to View BoQ information
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