Reconditioning of 2.5 MVA AVR No. II,by way of replacement of damaged components including replacement of transformer oil along with allied Works at Tawi pump House Jammu

Amount

Dehumidification and filtration of Insulating oil filledin main transformer unit (consisting of step up/stepdown transformer and Buck boost Transformer) of 2.5 MVA AVR No II installed at Tawi Pump House Jammu. Purification of Transformeroil by various processes such as heating, filtration, dehydration and degasification of transformer oil in the filtration machine at site to remove moisture,acid, gases and sludge present in the insulating oil in order to improve Di -electric strength of oil (Approx. qty of oil to be filtered is 1600 liters) and topping up with new transformer oil 240 liters (approx.) (Provided by the Deptt.). It includes servicing of main transformer units and replacement of minor items such asdamagedgaskets, rubber packing, breather with new one and providing and filling of new silica gel. Replacing damaged/overheatedAl.thimbles, bolts and nuts of requisite sizes.Complete job includes cost of material, checking BDV of Transformer oil, hire charges, to and fro carriage charges of filtration machine and labour charges

Providing and filling of fresh transformer oil of reputed make in voltage controller unit of 2.5 MVA AVR No.II by way of extraction of damaged transformer oil, cleaning the tank properly and providing and filling of 2170 ltr fresh transformer oil and checking the break down voltage (BDV). Job includes servicing of voltage controller unit by way of disconnecting the flexible cable from the tank terminal board lifting of all three limbs along with contact bar with the help of crane and shifting the same in the main hall of Tawi Pump House.The job involvesproviding consumables like providing gasket, silica gel,nuts/bolts, Al. Thimbles/Sundries etc. also cleaning and smoothening the marked /pitted portion the coil surface carefully with grade 0 emery cloth by rubbing gently around the coil surface in the direction of winding. Washing out the coil assembly with the fresh transformer oil so that copper dust left on the coil get washed away.Checking that all the roller assemblies run freely on the spindle and carbon brushes on the coils with minimum play.Lifting the complete unit and lowering it in the main tank of the regulating unit with the help of crane in such a way that no part /component is disturbed/damaged. Complete job includes cost of material and labour charges

M/S RAGHUNATH MECHANICAL AND ELECTRICAL ENGINEERING WORKS

NATIONAL ELECTRO-MECH COMPANY