A method and apparatus for detecting electrical arcs in an electrical system having a periodic power supply is disclosed. A method according to the invention compares instantaneous values of a monitored waveform both with (a) their past values at corresponding phases of the AC supply waveform, and (b)...http://www.google.fr/patents/US6859042?utm_source=gb-gplus-shareBrevet US6859042 - Arc detection by non-causal signal correlation
