go to the Air-insulated switchgear product page Harsha Bhagchandani asked on Oct 20th, 2015 in Air-insulated switchgear

Can Fast Acting Earthing Switches (FAES) only be applied in GIS substations and why are FAES usually not required for AIS substations?

Helene Hedlund, Global Product Manager LTB

ABB's answer

FAES are earthing switches capable of switching induced currents. These induced currents are normally arising either by cables (hence the normal use in GIS) and/or long, adjacent parallel energized lines. IEC 62271-102 Annex C defines the induced currents values as per two classes A and B.

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  • Helene Hedlund

    Helene Hedlund

    Global Product Manager LTB

    High Voltage Products

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