NIT NO.03, ITEM NO.01(2021-22)WW-I

ITEM – A:- Charges for dismantling of DE & NDE side end shield, taking out of rotor from the stator. Repair of Stator Winding:- De- brazing of connection joints of 1 no. damaged & 12nos. pitch coils for half lifting & take out of 1 no. damaged coil from the stator slots. Dismantling of slot wedges of 13 nos. stator slots, cutting of tying & lacing of 1 no. damaged flash coil and 12 nos. old coils of both the overhang portion of the stator winding. Half lifting of 12nos. Pitch coils for taking out of the 1 no. damaged coil. Making & forming of 1 no. new coil, Providing of multiple layer of H class epoxy enriched glass mica insulating tapes. Hot pressing of slot portion of the same, taking of all the relevant test on 1 no. newly formed coil, Cleaning of old insulation of 12 nos. half lifted coils. Providing of multiple layer of H class epoxy enriched glass mica insulating tapes on both the overhang & slot portion of 12 nos. half lifted coils, Hot pressing of slot portion of the 12 nos. half lifted reinsulated coils. Refitting of 1 no. new coil & 12nos. half lifted coils in the stator slots. Providing & fitting of epoxy glass slot wedges in the 13 nos. stator slots. Tying & lacing of 1 no. new & 12 nos. half lifted reinsulated coils on both the overhang portion of the stator winding with glass card, Making & silver brazing of connection joints of 1 no. new & 12 nos. half lifted coils, Providing of H class mica insulation of the brazed connection joints. Repair of bearing Seat of rotor shaft :- Under cutting of DE side bearing seat of rotor shaft, rebuilding with 680CGS L&T make welding electrodes, stress relieving, machining & grinding as per bearing ID. Checking of run out of rotor shaft & dynamic balancing of rotor. Cleaning of all the mechanical parts, ball bearings, greasing of ball bearing, assembling & testing of motor.

ITEM –B:- Cleaning & varnishing of rotor & stator core & winding:- Stator:- Cleaning of stator winding & core with high pressure air, high pressure steam & soap & DM water with German Steam Generator, Removing of dust, dirt carbon & oil / grease engrance from the stator winding. opening of air ducts, checking & rectification of loose tying & lacing of both the overhang portion of stator winding by providing of epoxy glass card, checking & rectification of loose slot wedges as required, drying out of stator winding in temperature controlled hot air oven, Taking of IR /PI values preheating & flooding of stator winding with F class epoxy varnish, baking the same, cleaning of core to remove the excessive varnish, taking of IR /PI values of stator winding. Rotor:- Cleaning of rotor with high pressure air, steam, soap to remove dust, dirt, Opening of air duct of rotor core, drying out the rotor, taking of IR /PI values & varnish impregnation with F class varnish of Dr beck. Baking of the same in temperature controlled oven, cleaning of excessive varnish of rotor core.

Supply of bearing Coupling side bearing Nu 328

ITEM – C:- Transportation charges from Chandrawal water works to our workshop & returned back after repair work. (Each side)

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