ARC FAULT CIRCUIT INTERRUPTER SYSTEM

摘要

In order to determine whether arcing is present in an electrical circuit, a sensor signal (didt) , corresponding to current in said electrical circuit is processed. The sensor signal is filtered (50,52,54) , to determine the presence of noise in a predetermined frequency range and produce a corresponding filtered signal. The corresponding filtered signal is compared (60) , to a reference threshold voltage to generate an output signal potentially indicative of arcing. A selection (61) , is made of one from a plurality of available threshold voltages as the reference threshold voltage for use in the comparing operation. The detection operation supports either or both branch feeder arc fault detection and/or series arc fault detection.