Disconnecting arcing faults by using integrated circuit which has noise detecting circuits, filters and current measuring circuits and microcontroller which decides if an earthing switch is operated

摘要

A circuit (18) is monitored by a sensor (16) which measures the rate of current change and supplies an integrated circuit (30). The integrated circuit has wide band noise detectors (24) and a current loss circuit (26) which supply data to a microcontroller (40). The microcontroller uses this data and a voltage measurement (130) to decide if arcing is present and if so to trigger (146) the operation of an earthing switch