Sensored bushing

Abstract

Bushing for connecting a separable connector to a switchgear or to a transformer in a national grid for distributing electrical power at medium or high voltages. The bushing comprises a) a bushing body of a solidified, electrically insulating casting material; b) a bushing conductor, embedded in the casting material, for conducting power at medium or high voltages into the switchgear or the transformer, and c) an integrated primary capacitor, operable in a high-voltage portion of a voltage divider for sensing a voltage of the bushing conductor. The primary capacitor comprises a low-voltage electrode, a high-voltage electrode and a dielectric. The high-voltage electrode is a section of the bushing conductor. The low-voltage electrode is embedded in the casting material and comprises a circumferential wall surrounding the bushing conductor and forming a cavity. The dielectric is formed by a portion of the casting material arranged in the cavity. The circumferential wall comprises a mesh of conductive wires forming a plurality of apertures between the conductive wires to allow the casting material radially outside the circumferential wall to be mechanically connected with the casting material in the cavity.