80866 Repairs Maintenance servicing and filtration of transformer earthing system lightening protection and other connected works in NAVAL area under GE Haddo Port Blair

Amount

M&L for online centrifuging (filtration/dehydration) of transformer oil including checking dielectric strength of oil before and after filteration for transformers located under GE Haddo area with suitable machine having filteration, heating and pumping facility to improve the dielectric strength / insulation value of the transformer oil upto 60KV/Min. (a) The contractor shall take shut down orders in writing before commencement of the work from Engineer-in-charge. (b) The contractor shall ensure no wastage of transformer oil. (c) The Contractor is solely responsible for any damage to the transformer during filtration operations. He is responsible for making good any damage to the transformer at his own cost without any extra cost to the department. (d) The contractor shall ensure that the conservator tanks are full to its level before starting the dehydration. (e) the di-electric strength of oil shall be tested before & after filtration. Test results shall be submitted to the engineer-in-charge duly signed.

Material and labour for preparation of old painted surfaces of floor mounted indoor/outdoor type transformer from 100 KVA to 500 KVA capacity by cleaning/rubbing with course cloth wire brushes to remove dust deposits oil grease and repainting by applying one coat of spray paint with synthetic enamel paint of approved colour without disturbing/damaging the electrical net work system/equipment including making of capacity /rating /incoming outgoing details in capital english alphabet of suitable size with radium stickers all as specified and as directed by Engineer-in-Charge.

All as per item No 2 above but from 750 KVA to 2000KVA

Supply and fix silica gel breather assembly complete with breather unit and silica gel including connecting with proper rubberised gasket and necessary fittings GI fittings for fixing/assembling upto 2000KVA transformer complete by removing the unserviceable breather assembly all as specified and as directed by Engineer-in-Charge. Make : Patel Electrical Industries or equivalent recommended by OEM

Supply, filling and for topping up the transformer with new transformer oil duly filtered with filtration plant. Make : Power Oil Ltd/Savita/Castrol. Note : (a) The transformer oil shall be type EHV confirming to IS - 3351983. (b) Mineral oil grade shall be used. (c ) The transformer oil should have a high dielectric strength not less than 60 KV/Min.

Taking down burnt defective drawnout/inlet Valve (Brass 1 1/2" size) and supply and fixing new drawn out/Inlet valve (brass 1 1/2") suitable for any make of 100 to 2000KVA Transformer all as specified and as directed by Engineer-in-charge.

Taking down defective unserviceable LT bush porcelain insulator and supply and fix news LT bush porcelain insulator with oil seal for transformer outdoor/indoor up to capacity of 500 KVA including opening the top cover for fixing of LT Bush if necessary complete all as specified and as directed by Engineer-in-Charge.

All as per item No 7 above but of capacity from 750KVA to 2000KVA.

Taking down defective unserviceable HT bush porcelain insulator and supply and fix new HT bush porcelain insulator for transformer outdoor/indoor up to 500KVA including opening the top cover for fixing of LT Bush if necessary complete all as specified and as directed by Engineer-in-Charge.

All as per item No 9 above but from 750KVA to 2000KVA.

M&L for isolating the HT supply of transformer, disconnecting HT and LT connections of transformer by opening clamps, bus bar extension and isolating the cables from transformer, outdoor of 100 to 2000 KVA capacities, checking of transformer pressure release valve, oil condition and carrying out tests such as HV/LV megger test, ratio test, magnetic balance test, short circuit test including opening the inspection cover/top lid after drain out of oil as required to check the lead condition from winding to bus rods including necessary soldering/jointing, fixing of new sleeves etc, and charging of transformer and making all necessary connections / assembly & control circuits all as specified and directed.

Taking down unserviceable sheet gasket (Cork sheet), Supply and fix synthetic rubberized cork sheet gasket 6mm thick 2' x 3' size approx sheet thick as required at site for top cover HT/LT bushes at places existing and tighting all the bushings and top cover to avoid any oil leakages of capacity 100 KVA to 500 KVA complete all as specified and as directed by Engineer-in-Charge.

All as above item but no.12 of capacity 750 KVA to 2000KVA

Disconnecting defective out door/indoor transformers, 11KV/433 V of various capacities up to 2000KVA from HT/LT sides taking down transformer oil completely, storing oil in suitable container (to be provided by the contractor), lifting the top cover and core assembly carefully and checking the conditions, refilling the transformer Coil completely after necessary repairs, re-fixing core assembly including fixing the top cover and painting to transformer complete all as specified and as directed by Engineer-in-Charge. Note : (a) Rewinding of transformer shall be measured and paid separately. (b) In case of major repairs/replacement in transformer, which can not be undertaken at site, the transformer shall be shifted to civil workshop and refixed at site after rewinding by Hydra and connected accessories (complete transformer). (c) Dismantling of core and repairs shall be measured and paid separately. (d) Rate quoted shall deemed to be inclusive of Shifting of transformer to workshop and back. (e) Complete gaskets, nuts and bolts shall be replaced by the contractor and the quoted rate is deemed to be inclusive.

Disconnecting electrical connections and engine from DG Set Alternator of 1250-2000KVA capacity and taking down the DG Set alternator from its base frame with the help of existing EOT crane at 3.6MW MES power house including carrying it to Civil work shop at main land and bringing back to original position after carrying out repair/rewinding works/varnishing and testing at repair work shop and re-fixing the alternator to DG set including laser alignment complete & re-testing of alternator at site of work for rated output complete all as specified and as directed by Engr-in-Charge.

Disconnecting electrical connections and engine from DG Set Alternator of 63-500KVA capacity and taking down the DG Set alternator from its base frame with the help of hydra/manpower at various power houses under GE Haddo including carrying it to Civil work shop at main land and bringing back to original position after carrying out repair/rewinding works/varnishing and testing at repair work shop and re-fixing the alternator to DG set including laser alignment complete & re-testing of alternator at site of work for rated output complete all as specified and as directed by Engr-in-Charge.

M&L for lifting of transformer core of capacity 100 to 500 KVA and keeping the core inside oven chamber to remove moisture and increasing of the insulation value of core and drying the core assembly for minimum 3 days at a temp of 120°C. Note :- (a) Cost for lifting/lowering the core of transformer by crane is inclusive. (b) Labour for fixing the connection/removal of connection inside the heating chamber is inclusive. (c) Power consumption for heating core for improving insulation value is inclusive. (d) Temperature 120°C to be maintained and inclusive in the rate quoted.

All as per item no 17 above but of capacity 750 KVA to 2000 KVA.

Taking down burnt defective high tension copper coil of Transformer and supply and fix new HT copper coil made out of proper/ required as per the existing size copper wire enameled of high quality matching with the existing impedance and pre- insulation all as specified and directed. Note : (a) The cost of coil shall be inclusive of varnish sleeving of insulating material. (b) Cost of taking down the clamps, upper channels and core & HT links and re-clamp, positioning with separators, brazing etc completely shall be deemed to be included in the quoted rate.

Taking down burnt defective Low tension copper coil/copper strip of Transformer/DG Set alternator and supply and fix new LT copper coil/copper strip of existing size made out of proper/ required copper wire enameled of high quality matching with the existing impedance and pre- insulation all as specified and directed. Note : (a) The cost of coil shall be inclusive of varnish sleeving of insulating material. (b) Cost of taking down the clamps, upper channels and core & LT links and re-clamp, positioning with separators, brazing etc completely shall be deemed to be included in the quoted rate.

Taking down unserviceble tinned copper bus bar of various sizes from HT/LT side cable bushing rods from the transformer of 500KVA to 2000KVA capacity and supply and fix electrolyte tinned copper bus bar of suitable size and length including making holes as required at site to the transformer LT/HT side cable bushing rods all as specified and as directed by Engineer-in-Charge.

Supply and fix offload tap changer assembly suitable for 11/433KV, any make upto 500KVA transformer with 7 tapping position including opening top cover, conservator etc as fixed against repairs all as specified and as directed by Engineer-in-Charge.

All as per Item No.22 above but of capacity 750 - 2000 KVA.

Dismantling of existing cement mortor, taking down the existing transformer platform complete all as specified and as directed by Engineer-in-Charge.

M&L for rendering in CM 1:3, 10mm thick, on fair faces of existing transformers platform complete all as specified and as directed by Engineer-in-Charge.

Supply and lay graded stone aggregate of 63mm size underneath transformer yard all as specified and as directed including removal of existing damaged / powdered stone aggregate.

Material and labour for PCC 1:3:6 type C1 using 20mm grade stone aggregate as in coping of transformer plotform all specified and directed.

Supply and making new LT 1100 V end termination with suitable size of aluminium lugs duly crimped for LT 3 ½ core armoured aluminium conductor cable after isolating supply to transformer/LT panel and disconnecting burnt/fault cable from the bunch of cables in trenches, galleries, removing cable loop, opening the cable blank and connecting back after end terminals including testing for 3 ½ core cable upto 185 Sq.mm(XLPE) including necessary exacavation if necessary for removing cable from loop all as specified and as directed by Engineer-in-Charge.

All as per item no.28 above but for 240 to 500 Sqmm Size.

Supply , lay test and commissioning of 4.0core X 25sqmm LT XLPE insulated sheathed ,armoured cable aluminium conductor 1100 Volts grade connecting both end with suitable lugs all as directed. Make : Havells/ polycab/ gloster

All as per item no.30 here in before but for 3.5 core X 95 sqmm

All as per item no.30 here in before but for 3.5core X 300sqmm

All as per item no.30 here in before but for 3.5core X 400sqmm

Taking down the corroded chequered plates , supply & fix new chequered plates of 10 mm thick with handle for lifting and angular supports 50 x 50 mm welded at bottom to support as per site condition all as specified and as directed by Engineer-in-Charge.

Material and labour for earthing complete with galvanised steel earth plate electrode 60 x 60 cm and 6 mm thick burried directly in ground (earth pit not less than 2.25 m deep below ground level) with top edge of plate not less than 1.5 m below ground level connected to galvanised GI earth strip 32 x 6 mm size by means of nuts, bolts, check nuts and washers of the galvanised iron or steel all as shown in electrical plate No 5 connected to earthing test point all as specified and directed and 20 mm GI pipe medium grade with funnel for watering and 40 mm dia GI medium grade pipe 7.5 mtr for GI earth strip protection from earth pit to test point & PCC for pit with white wash including CI pit cover 30 x 30 cm by taking down old unserviceable earthing. Note : Contractor shall submit the test results of earthing to the Enginee-in-Charge.

Supply and fix epoxy insulator saddle type with 40 mm height, fixed on PCC block/on wall or any other place as indicated and as directed by Engineer-in-Charge.

Supply and laying GI earth strip of size 32 x 6 mm in trenches/fixed to walls with saddles and fixing screws etc., from earth pit to test point all as specified and as directed by Engineer-in-Charge.

Material and labour for air termination single pointed aluminium rod 12 mm dia, 300mm long and taking down the unserviceable/broken one including removing from site all as specified and directedby Engineer-in-Charge.

Material and labour for aluminium strip of size 25 x 3.15 mm with saddle or fixed with screws etc., for roof conductor and down conductor, above ground including taking down unserviceable/broken aluminium strip all as specified and as directed by Engineer-in-Charge. Note : Fixing of insulators will be paid separately.

Material and labour for test point terminal block made of gun metal or phosphorus bronze of size 75 x 25 x 10 mm drilled and screwed including 3 Nos. 8 mm dia, 25 mm long hexa headed screwed including taking down unserviceable one and remove from site all as specified and as directed by Engineer-in-Charge.

M&L for shifting of Transformer of capacity upto 2000KVA from MES power house to variours substations/transformer locations at haddo area by road and removing the faulty transformer from the plingth and fixing/errecting of the healthy tansformer with the hydra/crane support, making necessary HT/LT cable connections, earth connections and restoration of power supply all as specified and as directed by Engineer-in-Charge.

Material and labour for earthing complete with copper plate earth plate electrode 60 x 60 cm and 3.15 mm thick burried directly in ground (earth pit not less than 2.25 m deep below ground level) with top edge of plate not less than 1.5 m below ground level connected to copper earth strip 20 x 3 mm size by means of nuts, bolts, check nuts and washers of the galvanised iron or steel all as shown in electrical plate No 5 connected to earthing test point all as specified and directed and 20 mm dia GI pipe medium grade with funnel for watering and 40 mm dia GI medium grade pipe 7.5 mtr for GI earth strip protection from earth pit to test point & PCC for pit with white wash including CI pit cover 30 x 30 cm by taking down old unserviceable earthing. Note : Contractor shall submit the test results of earthing to the Enginee-in-Charge.

Supply and laying copper strip of size 20 x 3.15 mm in trenches/fixed to walls with saddles and fixing screws etc., from earth pit to test point all as specified and directed.

Supply and fixing in repairs 4 pole manually drawn out electrically operated Air circuit breaker of capacity 4000A, 75KA @ 440 V, AC with microprocessor based triping sysytem against Short circuit, instantaneous and earth fault protection along with motor mechanism,closing coil, shunt release and instaneous under volt release pre trip alaram and indvidual fault LED indications all as specified and as directed by Engineer-in-Charge. Make: Cat No.CN-CS4000HO of L&T or equivalent Schnieder/SIEMENS/ABB Note: Quoted rate is deemed to be included necessary fabrication and modification to Panels and bus bars for fixing the ACB.

Taking down the old damaged/ deteriorated synthetic insulating rubber mats from the sub-station, Supply and lay new synthetic insulating rubber mats of size 2 m x 1 m x 20 mm thick, ISI marked complete all as specified and as directed by Engineer in charge. [Make: Jaipuria/ Pactil / jyothi / electromat]

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