supply of outdoor, plinth mounted, oil immersed, oil cooled, copper wound non-sealed type ( transformer tank body and cover are bolted ) distribution transformer, 250 kva rating, 11kv / 415v, 3-phase.outdoor, plinth mounted, oil immersed, oil cooled, copper wound non-sealed type ( transformer tank body and cover are bolted ) distribution transformer, 250 kva rating, 11kv / 415v, 3-phase., outdoor, plinth mounted, oil immersed, oil cooled, copper wound non-sealed type ( transformer tank body and cover are bolted ) distribution transformer, 250 kva rating, 11kv / 415v, 3-phase, 50 hz, primary winding in delta and secondary winding in star ( vector symbol- dyn11 ) , lv cable box, onan cooled transformer as per is 1180 ( part 1 ) : 2014 / latest with amendment nos. 1, 2, 3 & 4. off-load tap changer for variation of hv voltage from +5% to -10% in steps of 2.5%, with all standard fittings as per clause 20.1 of is 1180 ( part 1 ) and oil temperature indicator & winding temperature indicators, drain-cum- sampling valve ( 3 / 4 inch nominal size thread, is:554 ) of steel with plug, energy efficiency level- 3 & above, conforming to is 1180 ( part 1 ) : 2014 / latest with amendment nos. 1, 2, 3 & 4. [ warranty period: 30 months after the date of delivery ]