... Both for indoor and outdoor usage. Widely used in industrial park, residential quarters, business centers, high- ... H.V. bushings, on-load tap changer, off-circuit tap changer, inset fuse, pressure relief valve,oil ... , fuse and L.V. winding are connected in series as a phase unit to form a D ... together to build a solid construction in order to raise the short-circuit withstand ability. Transformer core -- ...