supplying , installation , testing and commissioning of 33/11 kv , 3 mva power distribution transformer and other allied materials under d . w . and s . mechanical urban division , ranchi , supplying outdoor type 33kv/11kv , 3 mva copper wound power transformer on load tap changer 15% to 5% in step of 1 . 25% with rtcc-avr and , marshalling box . continuous rated for three phase , 50 hz , full load and temperature rise not exceeding 40 degree thermometer in oil and 50 degree by the resistance in winding after continuous run at full load rating . the transformer should have oil immersed winding having vector group dy-11 . hv side connected in delta and lv side connected in star with neutral brought out connected to provided separate earthing . the transformer shall have power terminal arrangement , bushing on hv side and cable end box on lv side suitable to connect xlpe aluminium cable on lv side . the transformer should have following standard fittings: the oltc shall be accomplished with ( 1 ) oil conservator with fitting hole with cap and plain oil level ( 2 ) silica gel dehydrating breather charged with silica gel ( 3 ) oil drain valve ( 4 ) lifting eyes/hooks ( 5 ) oil filter valve ( 6 ) two earthing terminals ( 7 ) diagram and rating plate ( 8 ) air vent ( 9 ) . explosion vent ( 10 ) . bucholtyze relay ( 11 ) , resistance temperature detector ( 12 ) marshalling box . , supplying & laying of copper armoured 2 . 5 mm2 x 19 core control cable , cost of contruction of dp structure for transformer , supplying and erecting steel rail pole , top bracket channel , back clamp , 11 kv disc insulator with hardware , earthing set complete , ms nut and bolt , ms angle , gi wire , clamp for transformer base , top channel , ab switch , d . o . fuse angle , stay set complete 11 kv lightning arrestor , etc . complete as per the site requirement all complete .