Method for detecting earth-fault conditions in a power conversion apparatus

摘要

#$%^&*AU2018286627A120190725.pdf#####ABSTRACT Method (1) for detecting earth-fault conditions in a power conversion apparatus (100) characterised in that it comprises the following steps: 5 - acquiring (11) a first detection signal (DS1) indicative of an earth-leakage current (IG) flowing between said power conversion apparatus and the ground; - processing (13) said first detection signal (DS1) to calculate a first processing signal (PSI) indicative of a time-variant component (IGAC-BOI) of said earth-leakage current (IG) for one or more selected frequency bands of interest; 10 - processing (14) said first detection signal (DS1) to calculate a second processing signal (PS2) indicative of a time-invariant component (IGDC) of said earth-leakage current (IG); - processing (15) said first and second processing signals (PSI, PS2) to calculate a third processing signal (PS3) indicative of a resistive component (IGREs) of said earth-leakage current (IG); 15 - processing (16) said third processing signal (PS3) to determine whether earth-fault conditions are present. 10966445_1 (GHMatters) P110354.AU1/3 I Ic ---------|.- -.-.- -