supply of supply & testing of 250 kva, 11/0.433 kv, outdoor type step down transformer, confirming to is: 2026 three phase 50 hz oil immersed, natural cooled (onan), core type, double wound with copper conductor having off circuit taps from +5% to -5% in steps of 2.5 % on hv to vary hv, 50/55 deg. centigrade teprature rise in oil and winding respectively, high voltage side connected in delta whereas low voltage side connected in star with vector group referance dyn11 with netural of the secondry winding brought out for earthing, having porciling bushings on hv and lv side compleate with first filling of oil complying with is: 335 and fittings and accessories as per is:2026 as applicable. make: - eastern transformer, kanohar, stanelec or similar make of same specification.supply & testing of 250 kva, 11/0.433 kv, outdoor type step down transformer, confirming to is: 2026 three phase 50 hz oil immersed, natural cooled (onan), core type, double wound with copper conductor having off circuit taps from +5% to -5% in steps of 2.5 % on hv to vary hv, 50/55 deg. centigrade teprature rise in oil and winding respectively, high voltage side connected in delta whereas low voltage side connected in star with vector group referance dyn11 with netural of the secondry winding brought out for earthing, having porciling bushings on hv and lv side compleate with first filling of oil complying with is: 335 and fittings and accessories as per is:2026 as applicable. make: - eastern transformer, kanohar, stanelec or similar make of same specification.,supply & testing of 250 kva, 11/0.433 kv, outdoor type step down transformer, confirming t o is: 2026 three phase 50 hz oil immersed, natural cooled (onan), core type, double wound with copper co nductor having off circuit taps from +5% to -5% in steps of 2.5 % on hv to vary hv, 50/55 deg. centigrade teprature rise in oil and winding respectively, high voltage side connected in delta whereas low voltage side connected in star with vector gro