REPAIRS TO DISTRIBUTION TRANSFORMERS AT ELSEC AND CPDC SUB STATION AND ELSEC SUB STATION OF RCI UNDER GE I RND RCI HYDERABAD

Disconnecting the electric supply, removing the HT and LT cable connections and taking out the transformer of capacity upto 500 KVA from the platform, lifting the transformer with suitable crane, loading into the goods carrier and shifting the transformer to an approved factory (workshop) for reairs and transporting back installation in its original location including connection of HT and LT cable connections all as directed by Engineer-in- Charge. Note : Repairs to tranformer and testing will be measured and paid for separately

All as per item No. 1 above but of capacity 750 KVA.

M&L for draining out the transfomer 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, gaskets of inspection cover with new ones, conduct all testing, commissioning complete upto 500 KVA Transformer all as directed by Engineer-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 relevant items.

All as per item No. 3 above but of capacity upto 750 KVA.

Material and labour for placing core winding assembly into an Industrial Transformer Vacuum Drying Oven or vapour phase drying oven up to required heat for removing moisture to prevent damage to the paper and insulation layers of 500 KVA capacity distribution Transformer complete all as specified and directed by Engineer-in-Charge

All as per item No. 5 above but of capacity 750 KVA.

M&L for conducting the following tests after repairs of transformers capacity upto 3500 KVA including submitting the test report. (a) I.R values of HV to LV, HV to Earth and LV to Earth. (b) winding resistance. (c) Ratio test (d) No-load test (e) Short circuit test (f) Dielectric strength of oil (g) Transfomer tap switch positions Note: contractor shall arrange all measuring instuments / equipment for testing of transformer.

Supply and replace HT / LT porcelain bush rods and top gaskets suitable for any make of transformers of capacity 500 KVA capacity all as directed by Engineer-in-Charge

All as per item No. 8 above but of capacity 750 KVA.

M&L for making LV coil re-insulation with required gauge of craft paper cotton tape as per specification of old transformer of capacity upto 750 KVA (@ 110 & 145 Kgs) complete all as directed by Engineer -in-Charge.