Patelhold Patentverwertungs & Elektro-holding Ag

Ole Enkegaard

Hans Benninger

Fritz Eggimann

A detection circuit for remote release apparatus is disclosed which monitors a circuit carrying high-voltage between two connection points A and B and disconnects the circuit from the rest of a high-voltage network by automatically opening two power switches when a short circuit is detected. The ground fault protection system includes a pair of power switches for disconnecting points A and B from the remainder of a high-voltage network when a fault is detected in the high-voltage carrying circuit. A different one of a pair of detection circuits are associated with each point A and B. Each detection circuit causes both power switches to open when a fault is detected. The fault detection circuit associated with point A detects faults occurring in the high-voltage carrying circuit at any location extending from point A to at least one-half a distance to point B. The detection circuit associated with point B detects faults occurring in the high-voltage carrying circuit at any location extending from point B to at least one-half the distance to point A.

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Gebenstorf, Switzerland

Ole Enkegaard