METHOD AND SYSTEM FOR DETECTING AN ARC FAULT IN A POWER CIRCUIT

摘要

The method of detecting an arc fault in a power circuit comprises the following steps. An AC-signal is injected into the power circuit (52) and a response signal that is related to the injected AC-signal is measured in the power circuit (53). A frequency response of the power circuit is determined from the response signal. Then the frequency response is analyzed and a preferred frequency range is identified (54). A signal related to AC- current flowing in the power circuit within the preferred frequency range is measured (56) and an occurrence of an arc fault in the power circuit is signaled depending on the measured signal (58). The system for detecting an arc fault is designed to perform a method as described before.