Repair and maint of HT external elect replacement of HT conductor and underground cables and MCCBs at HQ Sect RR at Pattan Garrison under AGE (I) CIF (K)

Disconnecting all the electrical connections from H.T and L.T side of unserviceable transformer of capacity upto and including 400 KVA i.e. Jumpers/ Cable from the cable end box or bushings & earthing terminal of the transformers by removing the nuts bolts including taking down carefully, loading, unloading of transformer & transportation by vehicle from substation to the repairing workshop including reinstallation, commissioining and testing complete after necessary repair/ servicing etc all as specified and directed. NOTE : Loading/ unloading of transformer shall be the responsibility of the contractor at their own arrangement and nothing extra shall be admissible on this account.

Opening the transformer cover alongwith connected accessories, the conservator by removing the nuts, bolts then after removing the internal HT & LT connections by taking them out by removing studs, bushings, taking out the core-winding assembly out of the tank, removing out burnt HV and LV windings from the core assembly, cleaning of core assembly with CTC including necessary repairs for the unserviceable transformers having ratio 11/ 0.433 KV, draining & decanting of burnt transformer oil and cleaning of sludge deposited in the tank and cleaning by using CTC/ thinner for the transformers. Rewinding of HV and LV coils with suitable size super enamelled copper wire/ strip (as existing) having suitable class insulation material. Reconditioning of LT coil of aluminium/ copper wound transformer by turning the old paper insulations, straightening the entire LT Strip providing new paper insulations of superior quality and making coil of suitable design as original. Heating of core winding assembly in hot chamber for 48 hours and removing all the moisture present in it, removal of leakage of tank (if any) by welding, refilling transformer oil to tank, after putting the core-winding assembly into the tank, reassembling, making the internal HT & LT connections by fixing the studs, bushing, fitting the top cover by replacing cork sheet gasket along with conservator, testing the transformer in the workshop duly filled with oil, complete all as specified and directed for various capacities upto and including 400 KVA. NOTES :- (i) Copper wire to be measured as separate item. (ii) Repair of the transformer will be carried out at authorised workshop. AGE (I)/ AGE E/M shall visit workshop before repair of transformer and certificate of authorised workshop shall be submitted by contractor. (iii) Unserviceable items required for repairs shall be measured and paid separately under relevant items of this schedule. Transformer oil with die electric strength not less than 60 KV either new or filtered and dehyderated by machine shall be filled and shall be measured and paid separately under respective item.

Supply only super enamelled insulated copper wire any size and shape including all insulating binding, varnishing and baking if required, complete all as specified and directed.

Supply only copper winding strip with insulation of any size for LT coils of transformers including providing insulation all as required, complete all as specified and directed.

S&F in replacement for LT porcelain bushings 415 V of suitable size for outdoor/ indoor type with rubbersied cork sheet washers complete, of transformer of the capacity upto 400 KVA, complete all as specified and directed.

S&F in replacement for porcelain bushing for 11KV HT side outdoor transformer with rubberised cork sheet washers all as required at site suitable for transformer of capacity upto 400 KVA, complete all as specified and directed.

S&F in replacement for bush rod (for LT 415 V side) made out of copper as per existing size and type complete with one check nut, two nuts, washers and rubber seal, all as per sample for outdoor/ indoor type transformer of the capacity upto 400 KVA, complete all as specified and directed.

S&F in replacement for bush rod (for HT 11 KV side) made out of copper as per existing size and type complete with one check nut, two nuts, washers and rubber seal, all as per sample for outdoor/ indoor type transformer of the capacity upto 400 KVA, complete all as specified and directed.

S&F in replacement for breather assembly for transformer of capacity upto 400 KVA all as per existing all as directed at site, complete all as specified and directed.

S&F in replacement for Arcing Horns of suitable size complete all as per sample for transformer of capacity upto 400 KVA, complete all as specified and directed.