Arcing detection system

An arcing detection system that detects an output of noise superimposed on a voltage or a current of an electric circuit to which a load is connected, the arcing detection system comprising:

• a filter unit that extracts an output waveform in a high frequency band;
• a phase division unit that determines a peak time domain including domains before and after a peak at a commercial frequency related to the output waveform extracted by the filter unit and a 0 value time domain before and after an output at the commercial frequency becomes a 0 value to distinguish between the peak time domain and the 0 value time domain;
• a determination unit that determines an arcing event when an output in the peak time domain or a calculation value of the output in the peak time domain and an output in a 0 value time domain exceeds a threshold;
• and
• a threshold changing unit that changes the threshold depending on presence or absence of an output in the 0 value time domain.