| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly accurate electric leakage detector simple in configuration.SOLUTION: In order to obtain a resistance portion leakage current I0r using a zero-phase current sensor in three-phase three cable ways having one phase grounded, the output of the zero-phase current sensor before virtual electric leakage is added is measured, and the output of the zero-phase current sensor when the virtual electric leakage is added is measured. The resistance portion leakage current I0r is calculated from these measured values by a predetermined vector calculation. The vector calculation of the electric leakage detector is carried out by using an insertion parameter, a measurement parameter, and a formula (1). The measured value of the zero-phase current sensor is a value obtained when a measured value a of the zero-phase current sensor, virtual electric leakage b, and virtual electric leakage c are added. |
