REPAIR WORK OF TRANSFORMER AND REPLACEMENT OF HT AND LT CABLE, END JOINTS GOD AND LIGHTENING ARRESTERS AT 17 BIHAR REGT KHOJATOLI AREA UNDER GE RANCHI

Dismantling transformer step down out door type 11KV/433 Volts of capacity 315 KVA by disconnecting incoming /outgoing cables and ACSR jumpers, opening top end of the unit by unscewing nuts/bolts washers etc complete all as directed for replacement of unserviceable parts and reassembling including reconnections of incomers and outgoing connections (work includes replacement of gasket, seal, draining out and refilling of transformers oil, rusted /unsv nuts bolts with washers and general cleaning of transformers inner chamber by removing accumulated sludge etc at bottom before refixing) complete all as directed Notes:- (i) The transformer repair works shall be carried out at installed site by engaging specialised and experienced technicians and Auth work shop. (ii) The oil shall be filtered before refilling (if found reusable) The charge for filteration will be measured and paid separately. (iii) Breakdown shall be attend on verbal information recieved (iv) Rates for items No2 to 9 shall be paid as supply only as labour rate is included in this item.

Supply only the LT porcelain bushings with LT bushung rod (sturds) made out of gun metal with threading & of suitable length/ size complete of transformer step down out door type 11KV/433 Volts of capacity 315 KVA any make/ size/ type complete.

Supply only the silica gel breather assembly with silica gel for HT distribution transformers of 315 KVA capacity complete all as directed .

Supply only the Copper busbar patti in suitable length/ size complete of transformer step down out door type 11KV/433 Volts of capacity 315 KVA any make/ size/ type complete.

Transporatation Cost and Loading Unloading by Crane

Testing of di-electric strength i.e BDV test for 60 Sec with stand the transformer oil of any capacity to authorised value 45 to 60 KV using standard oil test kit as per result as IS 335 - 1993 & 6792 -1972 complete all as directed. Note :- (i) The rate quoted shall be deemed to include for arrangement of standard testing kit .(ii) The dielectric strength value of the transformer oil shall be tested before filtration.(iii) Sample of oil to be collected and testing to be done at transformer site.(iv) Testing to be done with gap seting - 2.5 mm , tempreture setting on ambient and frequency with 50 cycle . (v) Test reports shall be enclosed at the time of payment.

Filtration of transformer oil of transformers installed at various locations to achieve di-electric strength not less than 60 KV for 1 minute at 2.5 mm gap as per relevant IS with portable filtration plant, testing of the oil for the di-electric strength before filtration and after filtration complete all as directed. Note :- (i) The rate quoted shall be deemed to include for taking necessary conections to filteration plant from transformer and switch gear oil duly removing the inlet and out let connections. (ii) Electric supply for the filteration plant will be made self arrangement by the contractor and cost deemed to be including qouted rates. (iii) The dielectric strength value of the transformer oil shall be tested affter filtration as specified and directed. (iv) Test reports shall be enclosed at the time of payment.

Supplying, filling dehydration of new transformer oil for toping up/replacement of transformer oil having dielectric strength not less than 60 KV (rms) with gap of 2.5 mm all as conforming to IS 335 of 1993 complete all as specified and directed.

S&F in replacement of unserviceable lightning arrestors with new 11 KV Lightning arrestors explusion type complete with all fittings and necessary connection,transmission class, discharge capacity 65 kilo amps complete all as directed

Material and labour for switch air break, gang operated triple pole, mechanically operated (with GI operating rod), mounted on insulator and steel frame with operating mechanism worked from ground level, vertical type for current rating upto 400 Amps on HT 11000 volts working pressure, including locking arrangement with 06 lever lock and painting the steel surfaces with two coats of synthetic enamelled paint over a coat of red oxide primer etc all as specified and as directed.