Unitised Sub Station

The USS will comprise of HV 12 KV Load Break Switch Panel, Cast Resin Air Cooled Transformer, with associated protection and Ventilated Housing.The whole assembly is mounted on to a rigid base of steel fabricated section. The units are factory assembled, tested and they will be despatched in dissembled condition. All the dissembled components can be assembled at site.

Load Break Switch is suitable for indoor application and is used to switch ON/OFF the 11 KV supply.
The Load Break switch works on the principle of extinguishing the Arc by a blast of compressed air, produced by the switch itself, while opening. During the switch off operation, the Arcing contact maintains continuity while the main contact travels along with the piston attached with it, compressing the air in the pressure cylinder. After a predetermined length of travel, the arcing contact opens striking on arc. At the same time, a blast of compressed air, extinguishes the arc, through the nozzle surrounding the arcing contact.

The Air Break Switch is provided with HT Fuse and earthing facility. The panel is designed to segregate completely incoming and outgoing termination chambers with Epoxy resin cast seal off bushings. The HRC fuses are easily with drawable type so that fuses can be renewed easily. When the fuse switch operates on fault, the mechanism would give simultaneous break on all three phases and also would go into lock position to prevent closure until the blown fuses are replaced. The busbars will be 630 Amps rating, aluminium or electrolytic copper, tinned, supported by epoxy insulators