Repairs to 250 KVA LT Electric Transformer along with allied works at LIS Kherlaid

Repair to 250 KVA LT electric transformer installed at LIS Kherlaid 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. Taking out the coil assembly using chain pulley and other allied tools and tackles. Dismantling of damaged HT coils from the coil assembly at site. Draining out of transformer oil from container at site. Carriage of coils to road side using tools, tackles and manual labour through hilly terrain. Loading in mechanical transport for further shifting to workshop for repairs. 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 by keeping in oven. Filtration of old transformer oil by giving proper heat treatment at site. Then carriage back of newly rewound coils with other allied material to the site of installation in similar manner. Servicing, cleaning and flushing of oil tank by using appropriate chemicals to clean all the deposits. Fitting of the newly rewound coils 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. Filling of filtered transformer oil and topping up of new transformer oil 70 litres approximately. Providing and fitting of HT bush rod-3 Nos., LT bush rod-4 Nos., set of gaskets, sundry items and insulation etc. as required. Complete assembling of transformer. Making all the electrical connections on HT and LT side by P/F thimbles of required size/rating along with proper insulation. Checking for continuity, insulation and putting the transformer on no load till required megger value is obtained. Providing and fitting of new aluminum cable 185mm square 20 meter in length approximately in place of old damaged LT cable of transformer with proper thimbling and taping job also includes replacement of old damaged LT fuse set by way of providing, fitting of new LT Fuse set as per the sample. Complete Job includes cost of material, labour charges, installation, carriage, shifting, testing and commissioning on full load at LIS Kherlaid.

M/S RAGHUNATH MECHANICAL AND ELECTRICAL ENGINEERING WORKS

NATIONAL ELECTRO-MECH COMPANY