公开(公告)号：US10352985B2

公开(公告)日：2019-07-16

申请号：US15228404

申请日：2016-08-04

Applicant: ABB S.P.A.

Inventor： Enrico Ragaini ,  Marco Carminati

IPC: G01R31/02 ,  G01R31/08 ,  H01F38/40 ,  H02H1/00 ,  H02M7/04

Abstract: The invention relates to a method (100) for detecting faults in a LVDC electric line (500) characterized in that it comprises the following steps: acquiring (101) a first detection signal (VLOW) indicative of low-frequency components of an unbalancing current (IG) between a plurality of conductors of said electric line, said first detection signal being obtained by means of a low-pass filtering of a corresponding measuring signal (VM1) indicative of said unbalancing current; acquiring (102) a second detection signal (VHIGH) indicative of high-frequency components of an unbalancing current (IG) between a plurality of conductors of said electric line, said second detection signal being obtained by means of a high-pass filtering of a corresponding measuring signal (VM2) indicative of said unbalancing current; obtaining (103) a third detection signal (RT) by calculating the ratio between said first and second detection signals (VLOW, VHIGH); checking (104) whether a DC current (IF) is present by comparing said third detection signal (RT) with a first threshold value (TH1). In a further aspect, the invention relates to an electronic device (1) including processing means for carrying out said method.