Sp.77 NCTPS II ES circle EM II Division Sub division I Overhauling VPI of 11KV 4000W 239A 1494 RPM Primary Air Fan Motor 48266A421 81 01 including machining of NDE side rotor shaft and fabrication of labyrinth seal to match with rotor shaft new

Amount

Unloading of Motor and Dismantling 4000KW PA fan Motor by removing the silencer, fan cover, fan and Bearing pedestals, threading out the rotor

Preliminary inspection on Stator, rotor and other spares in presence of TANGEDCO Engineers. STATOR: Conducting the Electrical tests to find out the healthiness of stator winding (IR value, WR value and Surge comparison test), Visual inspection on the winding to find out any looseness of coils, top wedges PD symptoms, Checking condition of take-off leads, Checking Condition of terminal insulators and spares, Checking RTD, BTD and Heater terminals, Checking condition of RTD, Checking condition of Space heaters, Condition of machine foot. ROTOR: Shaft trueness checking, Shaft bearing seating area fitness checking, Visual inspection on the winding to find out any looseness of bars and crack in the end rings, DPT test on the bracing joints, Checking the other mechanical parts of the motor, Dynamic balancing the rotor to grade G 2.5

Checking the bearings and its clearance, inspecting the bearings.

Dismantling the worn out DE sleeve bearing from plumber block and re-fixing the New DE Bearing(Supplied by TANGEDCO). – If Necessary

Dismantling the worn out NDE sleeve bearing from plumber block and re-fixing the New NDE Bearing (Supplied by TANGEDCO). – If Necessary

Machining, grinding and polishing the NDE side rotor shaft bearing journal and labyrinth area and fabrication of labyrinth seal to match with rotor shaft new dimension.

COverhauling of Stator (VPI treated winding): Through cleaning of stator spares by using pressure water, Drying out in the oven, Applying resin on the winding, Baking in the oven, Conducting electrical tests on the stator including Tan delta and capacitance measurement, Applying anti tracking varnish on the overhang portion of winding,

Threading in the rotor, Assembling of motor and Conducting necessary test for trail run and painting

To and fro transport & transit insurance charges