Repairs to 250 KVA Electric transformer and Voltage stabilizer with allied works at LIS Kot-II

Repair to 250 KVA electric transformer installed at LIS Kot-II by way of disconnecting of HT and LT line connections from transformer. Extraction of Transformer using tools tackles, manual labour and Crane and then loading the transformer in Vehicle using the crane for further transportation to the workshop for repairs. 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. Extraction of damaged HT coils from the coil assembly at workshop. Draining out of transformer oil. Dismantling of coils at workshop and providing and rewinding of new HT coils for all the three legs and LV coil for 2 No. leg with the Aluminum wire of requisite specifications as per original design and varnishing complete. Drying the coils by keeping in oven. Desludging of complete T-oil by using suitable heat treatment and filtration methods and cleaning tank of dust, oily substances and then welding at the damaged surface to plug the leakage of T oil, cleaning the core assembly with kerosene oil and then after drying lowering it in the transformer tank, P/F of 3 No HT Bush rod assembly and 4 No. LT bust rod assembly with insulators and rubber sheets using skilled labour. 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 with 80litres of new transformer oil which will be provided by the department at Jammu. Complete assembling of transformer. P/F thimbles of required size/rating along with proper insulation. Checking for continuity. Back carriage of the Transformer from workshop to LIS KOT-II using mechanical transportation and then extraction and fixing of transformer on dual pole arrangement using crane and manual labour. Making HT and LT connections at site using skilled labour and then testing and commissioning at site. Complete Job includes cost of material, labour charges, installation charges, carriage, transportation charges, less cost of rebate on account of old damaged parts, hire charges of crane, shifting, testing and commissioning on full load at LIS.

Replacement of the damaged and worn-out components of the 250KVA voltage stabilizer of LIS KOT-II. Job includes disconnecting all the electrical connections of the stabilizer both on LT transformer side and LT distribution panel side by way of removing old rusted thimbles along with nuts and bolts. Shifting of the stabilizer to the nearest roadside by manual head load and loading of the same in the transport vehicle for further carriage to the workshop by employing hydraulic crane and manual labour at site. Replacement of the worn-out components of the voltage stabilizer at workshop by way of removing its top cover for extraction of inner assembly from the casing sump. Providing and fitting of new 02 nos. copper coils of requisite size and specifications, new insulation material and nuts/bolts, varnishing drying in hot air circulation. Lowering of the coils inside the casing. Providing and fitting of top cover gasket, nuts/bolts and complete reassembling of the stabilizer at workshop. Shifting back the voltage stabilizer to the site. Unloading the same at site employing hydraulic crane/manual labour and shifting by manual head load into the pump room for re-installation. Reinstallation of the voltage stabilizer in the pump room by fixing all the electrical connections, providing/fitting of new nuts/bolts. Topping up with 80 litres of Toil in the voltage stabilizer which will be provided by the department at Jammu. Testing of the 250 KVA voltage stabilizer on partial load and then on full load at site. Complete job includes cost of materials, hydraulic crane charges, less cost of rebate on account of old copper scrap, skilled/semi-skilled labour charges and tools and tackles required during the execution of the job.