bids are invited for operation and maintenance power house / power plant - 1238583 - pre overhauling, centrifuging, reconditioning activities and shifting of t&ps. , draining & re-filling of approx. 50-60 oil drum from main tank. , opening of transformer top cover and hv bushing. , internal inspection and testing of core coil assembly. , dismantling of radiator panel, mounting of main tank cover and blanking of main tank butterfly valve. , preparation of temporary oven for heating & dry out process. , heating and dry out cycle of main tank core coil assembly. , re-fixing of conservator, bushings, radiator panel etc. on main tank of the transformer. , centrifuging of transformer oil of uats up to bdv>75kv. moisture<7 ppm. , complete overhauling of oltc of uats. , painting of uats 10a & 10b.