MID/J/39

Repairs to 250 KVA transformer along with allied works at LIS Katal Batal.

Disconnecting the input and output connections, from HT and LT side of 250 KVA electric transformer after ensuring the shutdown from the concern sub division of PDD. Lowering the transformer from the platform and then loading the electric transformer using manual labour & hydra crane in the mechanical transport for shifting it to workshop for repairs. Unloading at workshop and then dismantling the 250 KVA transformer, at workshop by way of extracting out the damaged HT coils & LT coils, LT bushes-03 no., HT bushes-03 no., damaged insulator, rubber gasket, nuts and bolts. Complete rewinding of 3 no. HT leg coil assembly with aluminum wire of appropriate gauge & reconditioning of 3 no. LT leg coils which includes proper insulation. Keeping the coil assembly in the oven to make moisture free so that requisite megger value is achieved. Cleaning the sump/container of transformer with appropriate chemical agent to remove all carbon deposit. Lowering the assembled coil assembly in the sump of the transformer and then securing it with the body of the transformer. Providing and fitting of LT and HT bush rod sets, new insulator, rubber gasket, new copper nuts and bolts and other necessary items. Filling the transformer oil in the sump after giving heat treatment to make it moisture free and topping up with 150 liters fresh transformer oil. Refitting the top cover by providing and fitting requisite gasket, nuts and bolts of appropriate sizes. Testing the continuity of each phase and securing all connections. Shifting the repaired electric transformer back to site i.e. LIS Katal Batal in similar manner, unloading and installing at transformer hoisting channel/platform with the help of hydra crane and skilled manual labour. Connecting of HT supply by providing and fitting of thimbles along with aluminum wire of appropriate gauge/size. Allowing the transformer to charge at no load and then connecting the LT supply and testing the transformer on full load at site. The complete job includes cost of material, labour charges, loading& unloading, to & fro carriage, testing and installation and hire charges of the hydra crane used during the execution of job.

Rebate on Old Parts

M/S RAGHUNATH MECHANICAL AND ELECTRICAL ENGINEERING WORKS (BID ID -2424199)

NATIONAL ELECTRO-MECH COMPANY (BID ID -2426464)

NATIONAL ELECTRO-MECH COMPANY