the work of supplying, installing, testing and commissioning 3 phase, 22-3.3 kv, 50 hz., 1250 kva, power transformer at 22-3.3 kv switchyard of birwadi lift irrigation scheme, bhatsanagar, tal. shahapur, dist. thane. , providing, erecting and commissioning out door type copper wound transformer22000 / 3300 volt,1250 kva with on load tap changer - 15% to +5% in steps of 1.25% with rtcc, avr and marshaling box, and other specification as per technical specification, as per is 1180 (part i) : 2014 level i (as per amendment no.(4) to is 1180 (part i) : 2014) continuously rated for 3 ph, 50 hz, at full load and temp. rise not exceeding 45º c by thermometer in oil and 50ºc by the resistance in winding after continuous run resistance in winding after continuous run at full load rating, the transformer should have oil immersed winding having vector group dy 11, ht side connected in delta and lt side connected in star with neutral brought out connected to provided separate earthing.