REPAIR/MAINT OF 11/0.433 KV TRANSFORMER, RELYS, CT/PT, CALIBERATION OF VCBs, UPGRADATION OF SUB STATION AND OTHER CONNECTED WORKS AT GE DRONACHAL

Strip opening of step down transformer of capacity 100 to 200 KVA, indoor /outdoor type of any make after unscrewing nuts & bolts, screws and connected, dismantling carefully connected acesories and removing primary and secondary terminals, top cover, conservator tank, temp gauge,breather,neutral earth strips and draining out transformer oil to the required level and storing carefully in cleaned containers ( to be arranged by contractor) etc. for replacement of defective parts such as replacement of leaking gaskets, replacement of worn out/burnt out studs, checking and cleaning of contacts of tap changer and re-assembling the transformer after replacing the defective parts/repair complete all as specified and directed by Eng-in-Charge

All as per item No 1.00 & 1.01 here in before but transformer of capacity 250 KVA and up to 750 KVA complete all as specified and directed

Disconnecting the electric supply, removing the HT and LT cable connections and taking out the transformer of capacity up to 750 KVA from platform, lifting the transformer with suitable Crane, loading into the goods carrier and shifting the transformer to an approved factory (workshop) for repairs and transporting back installation in its original location including connection of HT and LT cable connections all as directed by Eng-in-charge. Note:-Repairs to transformer and testing will be measured and paid for separately.

M&L for draining out the transformer oil, removing the inspection cover, lifting the core with suitable crane and removing the winding from the core replacing the unserviceable insulation of LV coil, HV coil and rewinding the unserviceable HV, LV coil turns with new electrolytic copper conductor, drying of core and winding in the oven upto required IR values, assembling the core with new insulation, replace the unserviceable LT, HT bushing washers, oil seal, gasket of inspection cover with new ones, conduct all testing, commissioning complete upto 100 to 200 KVA Transformer all as directed by Eng-in-charge. Note:- HT/LT bush, transformer oil, LV, HV coils, inspection cover gasket and testing of transformer will be measured and paid separately under relevent items.

All as per item No- 4.00 above but of capacity 250 KVA to 750 KVA

M&L for making LT coil insulation with required gauge of craft paper cotton tape as per specification of old transformer of capacity upto 100 to 750 KVA complete all as directed by Eng-in-charge.

M&L for making HT coil insulation with required gauge of craft paper cotton tape as per specification of old transformer of capacity upto 100 to 750 KVA complete all as directed by Eng-in-charge.

M&L for making HT/ LT coil insulation with supper enamelled copper wire of required gauge as per specification of old transformers capacity complete all as specified and directed by Eng-in -charge.

M&L for conducting the folowing tests after repairs of transformers capacity upto 750 KVA including submitting the test report. (a) IR values of HV to LV, HV to Earth and LV to Earth. (b) Winding resistance (c) Radio test (d) No-load test (e) Short circuit test (f) Dielectric strength of oil (g) transformer tap switch positions Note:- Contractor shall arrange all measuring instruments/ equipments for testing of transformer.