Abstract
The medium voltage distribution networks are mostly ungrounded or grounded through arc-suppression coil. When single-phase grounding fault occurs in the system, the faulty line selection accuracy is low and it is difficult to locate. In this paper, a distributed faulty line selection and section location method are proposed for distribution network single-phase ground fault with flexible grounding of neutral points. When the system occurs a single-phase grounding fault, the middle resistance input time is controlled. According to the zero-sequence current amplitude difference on both sides of the line section before and after the neutral resistance input, a zero sequence current amplitude comparison protection criterion is proposed to select the faulty line and fault section. Using Matlab software builds the distribution network model, and the simulation results verify the effectiveness of the proposed method.
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