公开(公告)号：US20170038423A1

公开(公告)日：2017-02-09

申请号：US15228404

申请日：2016-08-04

Applicant: ABB S.P.A.

Inventor： Enrico RAGAINI ,  Marco CARMINATI

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

CPC classification number: G01R31/086 ,  G01R31/025 ,  H01F38/40 ,  H02H1/0007 ,  H02M7/04

Abstract: The invention relates to a method (100) for detecting faults in a LVDC electric line (500) characterised 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.

Abstract translation: 另一方面，本发明涉及一种包括用于执行所述方法的处理装置的电子设备（1）。