supply of distribution transformer of rating 250 kva , distribution transformer of rating 250 kva, 11kv/415v-240v, 3-phase, 50hz, outdoor type, plinth mounted, the type of tap changer: off-load tap changer for variation of hv voltage from +5% to -10 % in steps of 2.5%, energy efficiency level 3 or better, oil immersed, non-sealed type (transformer tank bo dy and cover are bolted), copper wound, primary winding in delta and secondary winding in star (vector s ymbol- dyn11), onan cooled transformer, conforming to is 1180 (part 1):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 will be applicable for all capacity of transformers. oil temperature indicator & winding temperature indicators will be provided as per clause 20.2 f) of is 1180 (part 1). termi nal arrangement: the transformers shall be fitted on high voltage and low voltage sides with outdoor type bushings of appropriate voltage and current ratings. the high voltage bushings (3 nos.) shall conform to is/ iec 60137. the low voltage bushings (4 nos.) shall conform to is 7421. suitable cable-end box along with c able entry hole glands is to be provided at l.t. side. following has to be submitted by supplier along with s upply of material: (i) type test report of transformer having same rating, make (& model if any) and desig n from nabl accredited lab as per is: 1180 (part 1) latest. (ii) routine test certificates as per is: 1180 (par t 1) latest. (iii) special test certificates as per clause 21.4 sl. no. (a), (c), (d) & (e) of is: 1180 (part 1) latest . detailed specification attached as annexure a. [ warranty period: 30 months after the date of delivery ] ]