These GIS switchgear are available in voltage ranges from 12 kV to 800 kV. Medium voltage GIS are available up to 52 kV. Its pressure of SF6 gas must below 2.5 bar. Medium voltage GIS system has vacuum circuit breaker as the interrupting medium and SF6 gas as the main insulation.
Nowadays vacuum circuit breakers have become the dominant devices for electrical networks with a medium voltage of 6–35 kV. The vacuum circuit breaker consists of a vacuum arc quenching chamber (also called bottle), current terminals, traction insulator, control element, and an electromagnetic actuator.
Gas insulated switchgear (GIS) has sealed enclosure(s) filled with insulating gas sulphur hexafluoride (SF6) or mixture of SF6 and other insulating gases recently released to the market. The gas-filled sealed enclosure facilitates a compact, low-profile installation.
Custom Gas Insulated Vacuum Circuit Breaker can be customized to fit your specific application requirements while reducing maintenance costs and improving reliability.
Gear is configured to meet any system or application need
Switches and fuses never need adjusting, programming, or dielectric testing
Utility-grade design withstands time and the elements
Preassembled and simpler construction requirements
Lower up-front and maintenance costs than metal-clad switchgear
Fuses offer faster fuse-clearing time and reduce system stress compared to circuit breakers