With the increasing capacitive current in the distribution network system,the grounding method through a small resistance at the neutral point has been widely applied.However,there exists a problem in the small resistance grounding method where the zero-sequence current protection cannot isolate the fault line during high-resistance grounding.This article primarily analyzes the detection methods for grounding faults.Then,based on the time-domain characteristics of the zero-sequence current waveform,the protection principle and process for single-phase high-resistance grounding faults are analyzed,providing a certain reference value.
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