Rewinding of 695 KW,11KV, 3-Phase 1488 RPM Squirrel Cage Induction Motor (Unit-2) at Water Supply Scheme Tangnar stage-2

Amount

Complete rewinding of 695KW 3-phase 1488 rpm Squirrel cage VT HT motor at WSS Tangnar-II by way of: 1. Disconnecting the connections from the connection box, extracting the control cables, earthling from the system & disengaging the motor from the pump discharge head. The job includes dismantling the motor and extracting the rotor from the stator. The job also includes extraction of damaged coil including the insulating material from the slots of the stator using special tools & tackles without causing any damage to the stator slots. The stator shall be cleaned of all sorts of foreign particle of the insulating material & winding. The stator slots shall be finally washed with acetone/Isopropyl alcohol and dried properly using blower. 1. Providing & fitting of copper strip winding as per the sample, frame size & specification 1LA45004 including p/f of 95 Sqmm fiber glass insulated terminal leads. (Test certificate on a/c of purity of copper (not less than 99.9%) is to be provided by the firm/Supplier at the time of delivery. 2. Providing & fitting of high grade insulated tapes like glass fiber tape, hyper-thermal tape, Teflon tape and spun polyester tape followed by specially formulated epoxy resin insulation to copper strips as mentioned above to ensure sealed and homogenous insulation system & high dielectric strength. The job includes brazing, varnishing, P/F of fiber glass spacers (approx. 720No) of 5mm thickness and locking of 60 slots with 2mm thick fiber glass and finally sealing of the slots with epoxy sealant. 3. Heat treatment of the stator inside the Oven at the recommended tempt until the desired IR Values of minimum of 50Mohms is attained. 4. Testing of the winding in an open circuit w.r.t to earth on 27KV at workshop. The terminal connection shall be tapped out of the coil as per the type & pattern of winding of extracted ones. The job includes fixing of already available 14 line tempt sensors with 12 for windings & 02 for bearings. The sensor shall be fixed & activated for over current, locked rotor, dry run, earth fault & thermal overload. The job further includes assembling of stator with rotor and shield properly using highly skilled technical person well versed with HT motor works. 5. Providing & fitting of NDE bearing 6226C3 of SKF/ FAG Make. The job includes removing the old damaged bearings & fitting the new bearing including filling the recommended quantity of standard grade grease. 6. Providing & fitting of DE bearing 6230C3,7230B of SKF/FAG/ Make. The job includes removing the old damaged bearings & fitting the new bearing including filling the recommended quantity of standard grade grease. 7. Rebuilding of bearing housing by way of welding at the worn-out points particularly at bearing seats for material deposition and then applying high grade steel reinforced Epoxy putty at the worn-out places & finally turning the same on the Lathe to achieve the diameter at the worn-out places as per requirement. 8. Providing & fitting of Bearing Temperature Sensors 4 No’s of reputed make. 9. Hydra charges for: i) Loading the HT motor from the pump house into the truck and unloading the same at the workshop. ii) Loading the HT motor at workshop into the truck and unloading the same in the pump house. 11. Carriage Charges for: i) Shifting the HT motor from site to workshop and finally, back to site. ii) Shifting the HT motor from site to workshop and finally, back to site. 10. Installation of the HT motor over the discharge head of the pump and connecting the HT motor to the electric mains including connecting the control wires to the motor & testing the motor on no load for one hour. The motor shall then be coupled to the pump through available coupling and finally testing the pumping unit on full load. Note: a. The necessary test certificate of the said HT motor after rewinding is to be provided by the firm on the delivery of item. b. The rate includes Transit Insurance from site to workshop and back from workshop to site. c. The old material involved in the complete job has to be returned to the divisional store against proper return indent.

M/s Shaheen Enterprises