Fault Line Selection Method for Small Current Grounding System Based on Directional Traveling Wave Energy
Wang Jianyuan1, Zhu Yongtao1, Qin Siyuan2
1. Key Laboratory of Modern Power System Simulation and Control & Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin 132012 China; 2. CGN New Energy Holdings Co. Ltd Beijing 100010 China
Abstract：Existing traveling wave line selection methods are easily affected by high-resistance grounding, traveling wave total reflection, noise, and other harsh grounding conditions, so it has defect of low sensitivity and accuracy. Accordingly, propose a new method of grounding line selection for distribution lines by using the energy of the fault current direction traveling wave. This method, by selecting the transient zero-sequence directional current waveform of a certain data window of each line, obtains the corresponding frequency band coefficient through wavelet decomposition, the combination of the obtained coefficient and the wave impedance can be used to obtain the directional traveling wave energy in each line, the size relationship is reasonable to construct the criterion expression, the fault information is fully utilized, and the distinction between the faulty branch and the healthy branch is maximized, the fault line can be identified reliably. According to theoretical analysis, simulation and actual measurement results, this method increases the application range of the traveling wave line selection method, the sensitivity and accuracy of line selection are greatly improved by this method.
王建元, 朱永涛, 秦思远. 基于方向行波能量的小电流接地系统故障选线方法[J]. 电工技术学报, 2021, 36(19): 4085-4096.
Wang Jianyuan, Zhu Yongtao, Qin Siyuan. Fault Line Selection Method for Small Current Grounding System Based on Directional Traveling Wave Energy. Transactions of China Electrotechnical Society, 2021, 36(19): 4085-4096.
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2021, Vol. 36 
