METHOD FOR DETECTING GROUND FAULTS IN A LVDC ELECTRIC LINE AND AN ELECTRONIC DEVICE THEREOF

摘要

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.

主权项

1. A method for detecting faults in a LVDC electric line which comprises the following steps:
acquiring 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 a second detection signal (VHIGH) indicative of high-frequency components of said unbalancing current (IG), 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 a third detection signal (RT) by calculating the ratio between said first and second detection signals (VLOW, VHIGH); checking whether a DC current (IF) towards ground is present by comparing said third detection signal (RT) with a first threshold value (TH1).