Patent ID: 9366716
Filing Date: 2016-06-14
CPC Classification: G01R

Claim Text:
1. A method of detecting a sustained arc in an electrical system, the method comprising: collecting over a predetermined time period a load signal by sampling in the time domain and subsequently extracting spectral information comprising a frequency component and an amplitude component; determining a line current frequency of the electrical system, the line current frequency being a real-time frequency of a line current; removing a line frequency signature from the spectral information, the line frequency signature comprising the line current frequency of the electrical system and all frequencies above the line current frequency; subsequent to removing the line frequency signature, extracting at least one sub-harmonic frequency band from the spectral information, wherein each of the at least one sub-harmonic frequency band contains only frequencies that are less than the determined line current frequency; and analyzing the at least one sub-harmonic frequency band to determine whether an arc signal is present.