Recently, with the rapid increase in electric power supply, ground faults such as electric shocks and fires frequently occur. Hence, leakage protection has become increasingly important. Meanwhile, with the development of power electronic technology, distortions in power systems owing to power supply switching have increased considerably. In this paper, we present the leakage current caused by ground capacitance when the system voltage includes harmonics, and a large error is noted in the measurement results of the ground fault detection method Ior, which is currently mainstream.
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