GIS Components

Gas Insulated Substations
GIS is totally capsuled, that is impervious to and distinguished from the external ambiance. This is a huge benefit from environment viewpoint such as ocean based oil rigs, particle or mist pollution sources. Nevertheless, because the gas isolated switchgear is totally capsuled, a needed visible disconnecting means cannot be directly accomplished.
The grounding and disconnect switches, needed in both air and gas insulated arrangements, will have view ports in gas isolated devices.
GIS has reduce foot print a than a corresponding air insulated substation, usually less than half the area. Even though a gas isolated substation will initially cost more than a similar air insulated substation, the economics may rationalize its installation where land is pricey, such as city centres.
The switchgear is composed of isolators that open/close and cut off circuits of current, disconnectors that electrically isolate circuits and open voltage, and other components.
Gas Insulated Switchgear (GIS) is the name for a unit that houses these components and circuits in a single gas tank with a compact footprint.
Grounding devices that prevent electrical shock and lightning arresters that prevent dielectric breakdowns from lightning strikes are also included to enhance safety.

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