81499 REPAIR AND MAINT OF HT EXTERNAL SERVICES AND ITS CONNECTED WORKS AT PARUNDU UNDER GE TIRUNELVELI

SCHEDULE 'A'

De-hydration/ filtration of transformer oil by employing online filtration plant to achieve di-electric strength not less than minimum 50 KV including following work services :- (a) Removal of all suspended particles such as dust, rust, scales, collided carbon oxidation sludge, etc upto < 1 micron. (b) De-hydration of transformer oil under vacuum. (c) Circulation of heated oil and filling of treated oil in transformer tank. (d) Top up the transformer oil upto the level NOTE :- (i) Contractor shall use the vehicle mounted filtration plant with suitable size heavy duty hose pipe. (ii) The transformer oil required for replacing/top up shall be measured and paid separately (iii) Testing and Issuing test reports for di-electric strength (before and after filtration) and acidity of transformer oil

Material and Labour for transformer oil for top up in transformer. Note : Sealed container only will be brought at site with minimum BDV 60 KV complete all as specified and directed.

Disconnecting HT/LT connection of transformer, 11000/433 V, 3 Phase, 4 wire system and opening up the top cover of transformer of capacity upto 250 KVA for checking the conditions to carryout repairs at site, including draining out oil from the transformer in suitable container (containers to be provided by the contractor) and repair to the transformer with replacement of parts (as required), checking the lead connection from winding to bus rods including necessary soldering/jointing etc and after complete repair refilling the dehydrated oil, replacing perished gasket with new gasket of same size and testing on full load after connecting the HT/LT connections complete all as directed. Notes : (i) Major parts as under shall be measured and paid separately under appropriate item of this BOQ (iii) Dehydration/ filtration of transformer oil shall be measured and paid separately under relevant item of this BOQ’ (iv) T&P and minor parts will be arranged by the contractor and the cost thereof shall be deemed to be included in the unit rate quoted against this item (v) Rate deemed to be inclusive of securing the cables on HT/ LT side for tension free at cable entry box.

Disconnecting Primary/Secondary connection of transformer, 22000/11000 V, 3 Phase system and opening up the top cover of transformer of capacity 400 KVA for checking the conditions to carryout repairs at site, including draining out oil from the transformer in suitable container (containers to be provided by the contractor) and repair to the transformer with replacement of parts (as required), checking the lead connection from winding to bus rods including necessary soldering/jointing etc and after complete repair refilling the dehydrated oil, replacing perished gasket with new gasket of same size and testing on full load after connecting the HT/LT connections complete all as directed. Notes : (i) Major parts as under shall be measured and paid separately under appropriate item of this BOQ (iii) Dehydration/ filtration of transformer oil shall be measured and paid separately under relevant item of this BOQ’ (iv) T&P and minor parts will be arranged by the contractor and the cost thereof shall be deemed to be included in the unit rate quoted against this item (v) Rate deemed to be inclusive of securing the cables on Primary/ Secondary side for tension free at cable entry box.

Material and Labour for Replacement of HT bushing of transformer 11/0.433 KV of capacity upto 250 KVA complete all as specified and directed

Material and Labour for Replacement of LT bushing of transformer 11/0.433 KV of capacity upto 250 KVA complete all as specified and directed.

Material and Labour for Replacement of HT bushing of transformer 22 / 11 KV of capacity 400 KVA complete all as specified and directed.

Material and Labour for Replacement of LT bushing of transformer 22 / 11 KV of capacity 400 KVA complete all as specified and directed.

Material and Labour for Replacement of silica gel breather of 22/11 KV Out door type transformer capacity 400 KVA complete all as specified and directed.