Medium-voltage switchgear

metal-cladSF6 gas-insulatedpower distribution

Gas Insulated Switchgear Description Gas Insulated Switchgear (GIS) offers high reliability, safety, and maintenance-free features in a much smaller space, compared with conventional switchgear. Features ‧High reliability ○The live parts are sealed in metal enclosures filled with pure SF6 gas. Thus, it is protected from contamination by smoke, 　chemical fumes, dust or salt-laden spray or as ingress of small animals. This protection prevents the inside components 　from oxidation and rust caused by oxygen and moisture. ‧Space reduction 　○A medium voltage GIS can be installed into a space about half that required for a conventional type air-insulated metal-clad 　switchgear. ‧High safety 　○All the live parts are fully enclosed in grounded metal enclosures. Thus, there is no danger of an electric shock. SF6 is an 　inert, non-flammable, non-toxic, and odorless gas used as an insulation and arc extinguishing medium. Therefore, it is safe 　for personnel and there is no fire hazard. ‧Reduced maintenance costs 　○Since the live parts are fully enclosed in an oxygen-free and moisture-free environment, there is no aging decay. This leads 　to a reduction in labor costs for maintenance and inspection. ‧Short installation time 　○A GIS of about four panels can be transported fully constructed. The GIS can be energized by connecting external power 　cables to the pre-fabricated plug-in type terminals. Thus, shortening installation time.