supply of transformer 3 mva, 33/11 kv step down power transformer 3-phase, 50 hz,transformer 3 mva, 33/11 kv step down power transformer 3-phase, 50 hz,,transformer 3 mva, 33/11 kv step down power transformer 3-phase, 50 hz, oil immersed naturall y cooled onan core type double wound with copper conductor 50/55- degree centrigrade temperature rise in oil and winding resp. +/- 2.5 %, +/-5%, +/-7.5%, +/-10% off circuit tapping on ht to vary ht, 50/55 c temperature ris e in oil and winding respectively, high voltage side connected in delta whereas low voltage side connected in star having vector group reference dyn 11 with neutral of the secondary winding brought out for earthing outdoor type having proceline bushing on hv side and cable end box on low voltage side with fitting mentioned below transfor mer conforming to is:2026 and first fitting of oil as per is:355, make - abb, areva, crompton greaves, ete or similar. [ warranty period: 30 months after the date of delivery ] ]