Patent ID: 8542021
Filing Date: 2013-09-24
Classification: G01R,H02H

Abstract:
1. A fault detection system for a power distribution system having at least first and second line conductors carrying AC currents that are out of phase with each other from a source to a load, and a common neutral conductor, comprising an arcing fault current sensor comprising a coil wound on a hollow core and adapted to be coupled to both of said line conductors in a manner that the electrical currents in said line conductors flow in opposite directions inside said hollow core and thus inducing in said coil a first output signal that is a function of the difference of the electrical currents in said line conductors, a neutral current sensor producing a second output signal representing the magnitude and phase direction of current in said neutral conductor, an arcing fault detection circuit receiving said first output signal and including a processor receiving said first and second output signals and programmed to