supply of outdoor type distribution transformer , supply of outdoor type distribution transformer of rating 500 kva 11 kv/415 volt-240 volt, 3- phase, 50 hz, oil immersed, non sealed type ( transformer tank body and cover are bolted), copper wound, primary winding in delta and secondary winding in star ( vector symbol-dyn11), onan cooled transformer c onfirming to is: 1180(part-1):2014 with amendments no. 1,2,3,4 or latest and supplied with all standard fitt ings mentioned in clause20.1 of os: 1180 (part-1) latest with condition that drain-cum sampling valve will b e applicable for all capacity of transformers. oil temperature indicator & winding temperature indicators will be provided as per clause 20.2 of : 1180 part-1). the transformer shall be fitted on high voltage and lo w voltage sides with outdoor type bushings of appropriate voltage and current ratings. the high voltage bu shings (3 nos.) shall confirm to is/iec 60137. the low voltage bushings (4 nos.) shall confirm to is 7421. sui table cable end box along with cable entry hole glands to be provided ht side & lt side. type of tap chang er: on load tap changer for variation of hv voltage from +5% to -15% in step of 2.5%. energy efficiency lev el: 3 or above. make- kirloskar/ mei/agrosons/abb/servokon or equivalent. [ warranty period: 30 mo nths after the date of delivery ] ]