On Site Complete Servicing, re-conditioning and impregnation of 11 KV 695 KW HT Vertical Turbine Squirrel Cage Motor (Unit-4) at Lift water supply station Tangnar Stage 2nd

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On-Site Complete Servicing, re-conditioning and impregnation of 11 KV 695 KW HT Vertical Turbine Squirrel Cage Motor (Unit-4) at Lift Water Supply Scheme Tangnar Stage 2nd by way of: i) Disconnecting of HT motor from 11 kV Electric supply mains & disengaging motor from the Bowl assembly including dismantling of motor from its mounting stool. Loading/ shifting of same at convenient place at site for conducting necessary repair/servicing at site only in order to avoid apprehensions of any damage to HT motor during shifting to workshop through transportation etc. ii) Disassembling of HT motor involving removing of motor shield cover, extraction of rotor from stator assembly, including dismantling of bearing housings. iii) Checking, recording initial parameters by testing equipment's like fault analyzer [ for Watt, Volt & Ampere], current injection test at low voltage & at high current, Insulation Resistance Value [IRV] 1000 to 1500 Volts through Megger. iv) Cleaning and servicing of the Stator wingdings for removal of accumulated deposit, Grease, Oil, dust and carbon with the recommended solvent preferably Isopropyl Alcohol, petrol of required quantity (minimum 65-70 liters) .Cleaning ,washing has to be carried out outside the plant cum pump house (with in premises of the station) by loading, shifting & unloading HT Motor using Hydra crane with all arrangements of covering it after washing and cleaning with covering arrangement like water proof tent cum shed and shifting back inside Pump house after cleaning & washing; then impregnating the stator winding's by giving proper heat treatment through oven drying capable of holding above 695 KW HT Vertical Turbine Squirrel Cage Motor at 90 to 95 degree Celsius for minimum 48 hours and checking, recording final parameters after Heat treatment by testing equipment like fault analyzer[ for Watt, Volt & Ampere],current injection test at low voltage & at high current, Insulation Resistance Value [IRV] 1000 to 1500 Volts. After getting desired recordings from testing, applying of specific 11 KV grade Epoxy coatings [5 kgs approx.] along with hardener [1/4 kgs] as recommended to the stator windings to withstand damp & wet conditions and drying of the same by specific means. The Oven has to be shifted at work site including its loading, unloading transportation, installation, dismantling and shifting back to avoid apprehensions of any damage to HT motor during shifting to workshop through transportation etc. v) Reconditioning of bearings after removing them at Driving End “DE” & Non driving End “NDE” using bearing puller tools & tackles as per requirement. The job includes greasing of bearing 7230B, 6230 B & 6226 C3 with special grade grease [ 5 Kgs] after Cleaning and servicing of Bearing housings at both ends with specific means. vi) Complete disconnecting of both Terminal boxes Checking for worn out thimbles, cable kits, HT tapes, Bus bar-coupler rubber and silica gel and replacement there off. Draining of Moisture oil/water, replacement Lead terminals and thimbles. The Job includes crimping of thimbles after replacement of worn-out ones using Hydraulic crimping tool up to size of 1000 Sq mm. vii) Replacement of Bearing Temperature Sensors 4 No’s per motor along with replacement of Space heaters with 4 No sensors as a replacement against damage ones. viii) Reassembling of rotor assembly in the stator including fitment of bearing housings on two sides. The job includes fitment of shields with allied works. ix) Testing of HT motor 1st on no load & then on full load after Shifting of reconditioned and serviced motor on motor stool, and fitment of coupling/locking arrangement, & connecting of HT motor to 11 KV Electric supply mains.

Partial winding repairs on overhang portion at Drive end with replacement of 70 sqm of 11kV grade XLPE copper fiber glass insulated leads/cable (min. 09 M) to be fitted with winding strips at one end and other end at terminal box. The Job includes brazing of copper fiber glass cable end terminals with winding terminals using brazing tools, like brazing torch, copper brazing rods (filler metal), flux rods etc., the brazing has to be carried out by technically sound personnel having expertise in work. The winding of the motor is to be protected by insulated sheets from any kind of damage during the brazing process. The job includes insulation of brazed joint of motor using f-class insulation tapping. The job includes P/F of high grade insulated tapes like glass fiber tape, hyper-thermal tape, Teflon tape and spun polyester tape, this job is to carried after cleaning and washing of stator windings and before application of epoxy coatings.

Providing and fitting of 7230B Bearing at driving end “DE” of the HT motor assembly if found defective

Providing and fitting of 6230B bearing at driving end “DE” of the HT motor assembly if found defective

Providing and fitting of 6226 C3 Ball Bearing at Non driving end “NDE” of the HT motor assembly if found defective.

M/S SARIM ELECTRICAL SOLUTION