REPAIR/ MAINTENANCE AND DEHYDERATION OF DISTRIBUTION TRANSFORMERS AND ALLIED WORKS AT SECTOR-B AND SECTOR-D UNDER GE (S) PATIALA

Disconnecting defective transformer indoor/outdoor of capacity 500KVA both from HT/LT sides, and then drain out complete transformer oil, opening of top cover with due care and removal of all HT/LT winding connections from bushing and then lifting of core by means of tripod and chain pulley with due care for inspection and ascertain it’s serviceability state after keeping it aside. Removing of all sludge and unwanted material from tank and core, lowering of core assembly after carrying out required repairs to the winding and core.filling the drain out oil and make all connection to make the tranformer fully functional and tested to entire satisfaction of Engineer-in-charge. In case the repairs which are not possible at site then the transformer has to be taken to the work shop for repairs.all as directed by Engineer-in-charge. Notes :- (i) The cost of transportation shall be paid separately. (ii) The cost of rewinding shall be paid separately. (iii) The cost of dehydration/filtration & other necessary repair as directed shall be measured & paid for separately under relevant items of Sch’A’ (iv) Any additional transformer oil, if required will be filled by contractor and shall be paid under appropriate item.

Disconnecting defective transformer indoor/outdoor of capacity 315KVA both from HT/LT sides, and then drain out the transformer oil. Opening of top cover LT and HT side bushings with due care and removal of all HT/LT winding connections from bushing and then replacement of head gasket, LT and HT bushing packings complete and refilling the drain out oil ,close the top cover and ensured that no leakage in transformer from LT/HT bushing and top cover gasket complete all as directed by Engineer-in-Charge.

Disconnecting defective transformer indoor/outdoor of capacity 315-500 KVA both from HT/LT sides, and then drain out transformer oil. Opening of top cover, LT and HT side bushings with due care and removal of all HT/LT winding connections from bushing and then replacement of head gasket, LT and HT bushing packings complete and refilling the drain out oil ,close the top cover and ensured that no leakage in transformer from LT/HT bushing and top cover gasket complete all as directed by Engineer-in-Charge.

Taking down of transformers of capacity 50 /100 /250/ 300/ 400/ 500 KVA from 2/4pole structure or from PCC plateform with due care after disconnecting all HT/LT connections on pole mounted structures, loading the tranfdormer in road vechical for transportation to workshop for repairs unloading the tranformer at workshop for repair. Tranformer is opened and repair and tested in the presence of Engineer-in-charge. After the tranformer is repaired the same is loaded on road vechicle and tranported to site unloading the transformer by means of crane and remounting on 2/4pole structure and making all the connections complete all as directed by Engineer -in- charge.

Taking down of transformers of capacity 50/100 250 /300 /400/ 500 KVA from 2/4pole structure or from PCC plateform with due care after disconnecting all HT/LT connections on pole mounted structures, Transportation of transformer to PCC/ 2 or 4 pole structure to any other required location in Patiala cantt lowering and remounting on 2/4pole structure it by means of crane after disconnecting all connection and reconnection in new location including earthing connection complete all as directed by engineer in charge.

Material and labour for replacement of worn out HT copper coils made out of super enameled insulated copper wire all as per existing size and shape including all insulating, binding, material and then varnishing complete all as directed by Engineer in charge

Material and labour for replacement of worn out LT copper coils made out of super enameled insulated copper strip all as per existing size and shape including all insulating, binding, material and then varnishing complete all as directed by Engineer- in- charge

Dehydration/centrifuging of transformer oil by centrifuging machine electrically operated at site of installation of transformer in running condition of transformer including testing of transformer oil before and after centrifuging from top and bottom of transformer at 2.5mm gap the BDV should be 60KV and above complete all as directed by Engineer- in- charge.

Supply and topping up of transformer oil of dielectric strength of 65 KV complete all as directed by Engineer- in- charge.

Material and labour for replacement of worn out bushing rod made out of brass with heavy duty three nuts and three washer at both ends suitable for HT side all as exiting size, shape and length suitable for following capacity transformers :- (i)   160 – 250 KVA Transformers.