What is Gas Insulated Switchgear GIS | GIS Working Principle | Gas Insulated Switchgear Applications

A gas-insulated switchgear is a composite device encapsulated in a solid metal frame that houses different electrical devices such as circuit breakers, bus bars, transformers, earth switches, surge arrestors, etc. All these devices are immersed in sulfur hexafluoride gas (SF6) inside shielded compartments that are bordered by barrier devices. The main function of a GIS substation is to switch, separate, transform, measure and distribute electrical energy in power systems. The main feature of a GIS device is the use of SF6, an inert gas with exceptional insulation properties, and chemical and thermal stability.

By comparison, a GIS unit only requires centimeters for effective insulation, while an air-insulated switchgear unit would need meters to perform the same function. All these features make GIS a much more reliable device with less space and maintenance requirements than AIS.

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