tender for replacement of 4 nos aged bucholz relays and conservator tank butterfly valves by new ones and provision of 1 no new 3 gate valve in r,y,b of machine 3 and spare single phase power transformerat mettur tunnel power house 2) replacement of 3 nos aged bucholz relays and conservator tank butterfly valves by new ones and provision of 1 no new 3 gate valve each in machine 2 (r-phase, y-phase and b-phase) of 20 mva single phase power transformer at mettur tunnel power house 3) replacement of 4 nos aged bucholz relays and conservator tank butterfly valves by new ones and provision of 1 no new 3 gate valve at machine -1 (r - phase, y- phase) and machine-4 (r - phase & y- phase) of 20 mva single phase power transformer at mettur tunnel power house in erode generation circle.