Patent ID: 7489138
Filing Date: 2009-02-10
Classification: H02H

Abstract:
1. An apparatus for detecting arc faults, said apparatus comprising: a master node for digitally detecting a current signal and a voltage signal at a first point in a wiring system; a slave node for digitally detecting a current signal and a voltage signal at a second point in said wiring system; and a detection unit for detecting an arc fault in said wiring system by comparing said current signals from said master node and from said slave node and comparing said voltage signals from said master node and from said slave node by; monitoring a time variation of said current signal from said master node, monitoring a time variation of said voltage signal from said slave node, calculating a difference between said current signals from said master node and from said slave node, when said time variation of said current signal has an abnormal value, and calculating a difference between said voltage signals from said master node and from said slave node, when said time variation of said voltage signal has an abnormal value.