supply of distribution transformer of rating 160kva, 3- phasedistribution transformer of rating 160kva, 3- phase,supply of distribution transformer of rating 160kva, 3- phase, 50 hz, oil immersed, non- sealed type (transformer tank body and cover are bolted), copper wound, primary winding in delta and sec ondary winding in star (vector symbol- dyn11), onan cooled transformer, confirming to is:1180 (part-1):20 14 with amendment nos. 1,2,3,4 or latest, and supplied with all standard fittings mentioned in clause 20.1 of is 1180 ( part-1) latest with condition that drain- cum- sampling valve will be applicable for all capacity o f transformers. oil temperature indicator & winding temperature indicators will be provided as per clause 2 0.2 of is1180 (part-1). terminal arrangement: the transformer shall be fitted on high voltage and low volta ge sides with outdoor type bushing of appropriate voltage and current rating. the high voltage bushings (3 nos.) shall conform to is/iec 60137. the low voltage bushings (4 nos.) shall conform to is 7421. suitable ca ble end box along with cable entry hole glands is to be provided at lt side. rating of transformer: 160 kva, no load voltage ratio: 11 kv/433volt-250volt, type of mounting: plinth mounting, type of tap changer: off c ircuit tap changer for variation of hv voltage from +2.5% to -5% in steps of 2.5%, type: outdoor type, ener gy efficiency level (latest): 5 [ warranty period: 30 months after the date of delivery ] ]