Repair of 250 KVA Electric Transformer of LIS Rakiban along with allied works

Repair to 250 KVA LT electric transformer installed at LIS Rakiban by way of disconnecting of HT and LT line connections from transformer. Removing the top cover after unscrewing all the nuts and bolts along with dismantling of HT & LT bushes. Draining out of transformer oil from transformer tank at site. Taking out the coil assembly using chain pulley and other allied tools and tackles. Dismantling of damaged HT coils-12 nos and LT Coils- 03 nos from the coil assembly at site. Carriage of damaged coils to road side using tools, tackles and manual labour through hilly terrain. Loading in mechanical transport for further shifting to workshop for repair. Dismantling of coils at workshop and rewinding of HT coils with the aluminium wire of requisite specifications as per original design and varnishing complete. Dehydrating/drying the coils. Reconditioning of LT coils by way of rewinding of the aluminium coils as per original design with insulation material and varnishing complete. Then carriage back of newly rewound coils along with other allied material to the site of installation in similar manner. Servicing, cleaning and flushing of transformer tank by using appropriate chemicals to clean all the deposits and repair to radiator of the transformer to plug the leakage at multiple spots, drying completely. Fitting of the newly rewound coils (HT & LT) to the legs of the coil assembly and fitting of the core and making connections of the coil assembly. Lowering of the coil assembly in the container after making proper connections. Providing and filling of fresh transformer oil 120 litres approximately in the tank of the transformer. Providing and fitting of HT bush rods, set of gasket, sundry items and insulation required. Complete assembling of transformer using new nuts, bolts and washers as per site requirement. Making all the electrical connections on HT and LT side along with proper insulation. Checking for continuity, insulation and putting the transformer on no load and then on full load. Complete Job includes cost of material, skilled/semi-skilled labour charges, carriage/shifting charges, hire charges of tools and tackles required at LIS Rakiban Complete Job.

Providing/fitting of 320 Amp Main switch at LIS Rakiban in place of worn out/damaged one. The newly installed main switch is to be connected with stabilizer with the existing armoured Al cable from LT side of HT/LT transformer to supply end of 320 Amp Main switch, and from Load end of main switch to input terminals of Voltage stabilizer with new thimbles of suitable current carrying capacity. The job involves cost of material, labour, tools and tackles with carriage including testing and commissioning.