go to the Gas-insulated switchgear product page Anonymous asked on Jan 27th, 2015 in Gas-insulated switchgear

What are the advantages of a composite bushing compared to porcelain insulators in GIS and what does ABB recommend?

Olav Knudsen , Principal Engineer, Gas-insulated switchgear

ABB's answer

Composite insulators with silicone rubber shields offer many advantages over porcelain insulators and improve safety. The high flashover resistance is obtained through the chemical nature of silicone which makes the insulator surface hydrophobic. As the hydrophobic surface prevents pollution, possible discharge paths are minimized. Transport and handling benefits from the lower weight and the non-brittle material. In case of a failure, composite insulators are safe and do not break into scattered fragments as porcelain insulators. More information about composite insulators can be found in “High voltage products with composite insulators”. ABB recommends composite insulators with silicone rubber sheds for GIS and for other high-voltage components.

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  • Olav Knudsen

    Olav Knudsen

    Principal Engineer, Gas-insulated switchgear

    High Voltage Products

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