supply of distribution transformer , distribution transformer of rating 500 kva , 3 phase, 50 hz, oil immersed, non sealed type ( t ransformer tank body and cover are bolted), copper wound, primary winding in delta and secondary windin g in star ( vector symbol-dyn11), onan cooled transformer, confirming to is 1180 (part-1): 2014 with ame ndment nos. 1,2,3,4 or latest and supplied with all standard fittings mentioned in clause 20.1 of is 1180 ( p art-1) latest with condition that drain-cum-sampling valve will be applicable for all capacity of transformer. oil temperature indicator & winding temperature indicators will be provided as per clause 20.2 (f) of is 118 0 (part-1), terminal arrangement: the transformer shall be fitted on high voltage and low voltage sides wit h outdoor to is/iec 60137. the low voltage bushings ( 4 nos.) shall confirm to is 7421. suitable cable ?end box along with cable entry hole glands is to be provided at lt side. (i)rating of transformer: 500 kva (ii) no load voltage ratio: 11 kv/415-240 v, (iii) type of mounting: plinth mounting (iv) type of tap changer: on lo ad tap changer for variation of hv voltage from +5% to -15% in steps of 2.5% (v) outdoor type (vi)energy e fficiency level: 3 or above. make- power master/kirloskar/abb/servokon or similar [ warranty period: 3 0 months after the date of delivery ] ]