supply of supply of outdoor type , plinth mounted, distribution transformer, minimum energy efficiency level 3 of rating 500kva,3-phase, 11kv/415-240v, 50hz, oil immersed, non- sealed type etc.supply of outdoor type , plinth mounted, distribution transformer, minimum energy efficiency level 3 of rating 500kva,3-phase, 11kv/415-240v, 50hz, oil immersed, non- sealed type etc.,supply of outdoor type , plinth mounted, distribution transformer, minimum energy efficienc y level 3 of rating 500kva,3-phase, 11kv/415-240v, 50hz, oil immersed, non- sealed type (transformer ta nk body and cover are bolted), copper wound, primary winding in delta and secondary winding in star (ve ctor symbol- dyn11), onan cooled transformer, conforming to is 1180 (part1):2014 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. oil temperature indicator & winding temperature indicators will be provided as per clause 20.2 f) of is 1180 (part 1 terminal arrangement: the transformers shall be fi tted on high voltage and low voltage sides bushing appropriate voltage and current ratings., low voltage si de cable end box required. the high voltage bushings (3nos.) shall conform to is/iec 60137. the low voltag e bushings (4 nos.) shall conform to is 7421. off-circuit tap changer (applicable for all ratings above 200 k va) for variation of hv voltage from +5% to -10% in steps of 2.5%. [ warranty period: 30 months after th e date of delivery ] ]