tender for complete rewinding and repairing of 500kva 11kv 440volt lighting transformer sl.no.t 05 installed at 11kv 5&6 pit sub station and complete rewinding and repairing of 100kva 11kv 440volt lighting transformer of majhi para installed at old shankarpur substation, (b) maintenance of 500kva 11kv 550v 440v transformer of diamond sub station (c)maintenance of 250kva 11kv 440volt transformer of 11kv old shankarpur sub station (d) maintenance of 100kva 11kv 440volt transformer of 11kv old shankarpur sub station (e) maintenance of 100kva 11kv 440volt transformer of administrative office sub-station and (f) maintenance of 300kva 11kv 440volt transformer of old shankarpur sub station of shankarpur colliery .