Abstract
In order to protect the secondary equipment of gas insulated switchgear (GIS) substation, study on the very fast transients (VFTs) induced on secondary cables during the disconnector operations of GIS is developed. Based on the custom-designed experiment platform which can produce VFTs, the influences on VFTs including are discussed and some protections are proposed. The regularity of the influences is given through simulation including the GIS size, the soil resistivity and the loads. The measures to protect secondary equipment from the VFTs are suggested.
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