Patent ID: 9612267
Date: 2017-04-04
CPC Classifications: G01R,H02H

Claim:
1. An arc fault detection module for detecting arc faults in an AC electrical system having an AC phase line, comprising: a current detecting section having at least one output, the current detecting section being structured to determine whether at least one signal based on a current measured from the AC phase line exceeds at least one corresponding predetermined threshold level and cause the at least one output to indicate that the at least one corresponding predetermined threshold level has been exceeded in response to detecting that the at least one signal based on the current measured from the AC phase line exceeds the at least one corresponding predetermined threshold level; and a processing device structured to: (i) receive the at least one output, (ii) determine whether an arc fault in the AC electrical system has occurred based on at least the at least one output, (iii) determine an estimation of background noise based on at least one signal indicative of a current on the AC phase line, and (iv) adjust the at least one corresponding predetermined threshold level based on the estimation of background noise.