supply & testing of 500 kva, 11kv/750v, 3-phase, 50 hz. outdoor type power transformer c onforming to 15 2026 (part 1): 2011 (reaffirmed 2021), plinth mounted, copper wound, mineral oil immers ed with freely breathing system (also called conservator system) as per clause 8.2 (a) of is 2026 (part 1), primary winding in delta and secondary winding in star (vector symbol-dyn11), onan cooled transformer , minimum short circuit impedance of 5% as per is 2026 (part 5), with all fittings specified
nnexure a t o this description, terminal 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 confirm to is/iec 60137. the low voltage bushings (4) nos.) shall conform to 15.7421. suitable c able-end box is to be provided as follows: a) for outdoor type: l.t. side tap changer: on-load tap changer for variation of hv voltage from -+5% to -5% in steps of 1.25% make- andrew yule/aeg/crompton greaves/ kirloskar electric co./abb/siemens/schneider or similar. [ warranty period: 30 months after the date of d elivery ] ]
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