KMC/GRBU/T37/25-26

TOTAL

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NUMBER #

Complete dismantling of all mechanical parts of the HT switchgear after removing to a workable position inside the sub-stn. After dismantling of all the components properly overhauling by petrol & transformer oil to remove carbon particles & after overhauling re-fixed as per existing way for interlocking arrangement, bush spring etc.

Complete checking, cleaning and overhauling of H.T. Bus-bar sleeves tightness of various jumpers and spares etc.

Adjustment of all linkage and contact movement of HT breaker.

Necessary checking, testing of PT circuit including tripping test through all relays, primary injection through CT & measured secondary current of relays are to be made at site in presence of electrical engg.

Checking of IR value, high pressure upto 9kV for 1 minute, earth resistance upto the satisfaction of EIC.

Hiring of DG set for necessary checking testing of the instrument.

Discharging the primary and secondary side of transformer properly by earth rod and all the cable have to be dismantled by proper marking.

Dismantling of top cover, side cover, tap changing switch etc of the transformer.

Thorough cleaning & removing of dust of core &coil assembly, tap changing switch etc by CTC with the help of soft brush , clean cloth with hot air jet pressure after dismantling of HV & LV connection from bushing terminal end of inside transformer as per direction of EIC. A) Check and ensure that HT tap links of all the three phases are at same position and fully tightened and locked B) Check and ensure that all HT/LT connection nuts, bolts are fully tightened and locked. C) Check and ensure that the core, coil and its connections are thoroughly cleaned for any cobwebs, dust, dirt using air blower etc. D) The enclosure perforated sheet/mesh shall be cleaned thoroughly for cobwebs, dust, dirt ensuring adequate and proper ventilation of air through the same.

Re-insulation all the HT coil lead properly with insulating tape, varnish etc and reconnection of all the cable as per existing way and re-fixing the top cover, side cover, tap changing switch handle etc of the transformer after cleaning properly as per direction of EIC. A) Relays, its alarm and trip contacts, their circuits side covers, cable boxes, marshalling box, attend to any abnormality B) HT/LT bushings examine for dirt deposit and for crack/damages clean with non-fibrous.

Supply and replacement incl. control wiring of temperature scanner(Any reputed make)

Dismantling all the incoming & out going cable from the panel after disconnection the L.T source and discharge by the earth rod.

Racking out & drawing out of ACB (2000 amps) from L.T incomer panel after tripping the ACB manually & keeping the ACB in a workable position inside the room.

Open out the ACB cover carefully and complete dismantling all the parts like roller guide, main drive shaft, S.S pin, silt spring, ratchet assembly, trip bridge assembly, male & female contact etc, by the proper tools & tackles engaging expert personnel and keep in a suitable position at the pumping station.

Complete cleaning & overhauling all the parts of the 2000 Amps ACB in proper way by petrol & CTC to remove carbon particles, moisture, dust etc& after overhauling re-fix all the components as per existing way upto satisfaction of EIC.

Dismantling the carbonized & dusty busbar from the panel, cleaning the carbon, moisture & dust from the busbar by the proper method using petrol & CTC and re-fixing the busbar after cleaning & re-insulation the busbar by proper method and also thorough cleaning the panel as per existing way upto satisfaction of EIC.

Re installation the ACB to the existing incomer panel by existing way upto satisfaction of EIC.

Re-connection all the incoming & out going cables after re-socketing, re-sleeving with proper jointing compound materials and crimping method in proper position and existing way upto satisfaction of EIC.

Thorough checking of VCB, Transformer and ACB by proper instrument in proper way engaging Skilled personnel and charging up the system upto the satisfaction of EIC.

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