Semi-conductive stress relief shield for high voltage equipment

Details Semi-conductive stress relief shield for high voltage equipment Semi-conductive stress relief shield for high voltage equipment

H - Electricity

01

H

306/145

H01H 85/38 (2006.01)

Patent

CA 1114862

SEMI-CONDUCTIVE STRESS RELIEF SHIELD FOR HIGH VOLTAGE EQUIPMENT Abstract: A semi-conductive coating is applied on the outside diameter of a cake of arc extinguishing material positioned within the interior of a high voltage fuse, and the semi-conductive coating is electrically connected to one end ferrule of the fuse to form an electrical stress shield. Upon operation of the fuse, dielectric stress between the end ferrule and the metal fitting at the other end of the fuse tends to be concentrated by the semi-conductive coating within the insulative material of the fuse housing. Without the semi-conductive stress shield, dielectric stress at the edge of the outside fuse fittings may cause a corona discharge external to the fuse adjacent to the external fitting, which may trigger an external flashover along the length of the entire fuse.

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