| 摘要 |
PROBLEM TO BE SOLVED: To reduce errors in phase difference detection in a ground fault direction finding apparatus which finds the direction of a ground fault by detecting the phase difference between a zero-phase current and a zero-phase voltage that occurs at a ground fault accident. SOLUTION: The ground fault direction finding apparatus includes a zero-phase current peak detecting means 71 which detects timing at which a zero-phase current detection signal from a zero-phase current detector reaches a peak, and a zero-phase voltage peak detecting means 72 which detects timing at which a zero-phase voltage detection signal from a zero-phase voltage detector reaches a peak. The difference between the timing detected by the zero-phase current peak detecting means 71 and the timing detected by the zero-phase voltage peak detecting means 72 is determined to detect the phase difference between the zero-phase current detection signal and the zero-phase voltage detection signal. COPYRIGHT: (C)2011,JPO&INPIT |
