... transformers Combined transformer is composed of body, switches equipment, fuse, tap-changers,all together in a sealed full oil transformer body. ... room, including H.V. bushings, on-load tap changer, off-circuit tap changer, inset fuse, pressure relief valve,oil indicator, thermometer, ... equipments. Features : A, four pole type construction core, fuse and L.V. winding are connected in series as a ...