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1. (WO2018221619) ELECTRICITY LEAKAGE DETECTING METHOD

Pub. No.:    WO/2018/221619    International Application No.:    PCT/JP2018/020833
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Thu May 31 01:59:59 CEST 2018
IPC: G01R 31/02
H02H 3/00
H02H 3/347
H02H 3/38
Applicants: CDN CORPORATION
株式会社 シーディエヌ
FURUYA Kazuhiko
古屋 一彦
Inventors: FURUYA Kazuhiko
古屋 一彦
NODA Ryuzou
野田 龍三
NAGATOMO Kazunori
長友 一則
MATSUO Kazuaki
松尾 和顕
Title: ELECTRICITY LEAKAGE DETECTING METHOD
Abstract:
[Problem] The objective of the present invention is to provide a method for detecting an electricity leakage, which does not require the generation or injection of a signal, does not have a condition that a ground capacitance is balanced, and with which it is possible, using a single method regardless of whether the power supply is of a three-phase or single-phase type, or the configuration thereof, to obtain both a leakage current value and a detailed status indicating the power line phase in which the leakage has occurred, and whether the leakage is due to an increase in a capacitive component or due to a leakage resistance. [Solution] A leakage current detecting method for detecting a leakage current by measuring a current vector from a current flowing through a grounding wire of a power supply, and a current phase angle of a current flowing through the grounding wire, based on a power supply voltage, is characterized in that the measured current vector is defined as a first current vector, the current vector measured with a different timing to the first current vector is defined as a second current vector, a difference between the first current vector and the second current vector is calculated as a third current vector, and the third current vector is detected as the leakage current value.