Importance

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Abstract

A suspension insulator for supporting a high voltage power cable suspended from a transmission tower includes an elongated rod for supporting a load in tension, a plurality of insulating shells serially disposed along the rod and end connectors for attaching a high tension load to the rod. At least one of the end connectors includes an elongated metal cylindrical retainer having one or more metallic members with one or more inclined surfaces disposed within the retainer and circumferentially disposed around the rod. The space between the inclined surface or surfaces and the rod is filled by an epoxy resin compound. In order to prevent excessive heating of the compound due to external flashover of the suspension insulator and the possible resultant separation of the end connector from the rod, the suspension insulator includes a generally cylindrically shaped, electrically conductive, current bypass sleeve disposed about the retainer to provide a current path physically remote from the epoxy resin compound. Compensation members are provided between adjacent serially disposed insulating elements of the suspension insulator to provide for thermally induced volumetric changes within the suspension insulator. The compensation members are fabricated from a closed cell, compressible material. The suspension insulation further includes an annularly shaped corona shield serially disposed between the current bypass sleeve and the closest insulating shell to reduce the occurrence of radio frequency interference. The suspension insulator in one arrangement includes an elongated, shedless, ceramic insulating sleeve for reducing radio frequency interference when the suspension insulator is arranged with another suspension insulator in a 'V' configuration for supporting a plurality of high voltage power cables suspended from a transmission tower.

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First Claim