Faulty phase recognition method based on phase-to-ground voltages variation for neutral ungrounded distribution networks
Faulty phase recognition method based on phase-to-ground voltages variation for neutral ungrounded distribution networks
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DOI：
10.1016/j.epsr.2020.106848
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发表时间：
2021
影响因子：
3.9
通讯作者：
B. Fan;Ganzhou Yao;Wen Wang;Xin Yang;Haihang Ma;Kun Yu;Zhuo Chao;Xiangjun Zeng
中科院分区：
文献类型：
--
作者：
B. Fan;Ganzhou Yao;Wen Wang;Xin Yang;Haihang Ma;Kun Yu;Zhuo Chao;Xiangjun Zeng
单相接地故障的故障相位识别是中压配电网消弧措施的关键。由于高阻接地故障时电网的不对称性以及实际中对地参数检测的困难性，传统的方法往往失效。本文详细分析了三相对地电压随SLG故障电阻变化的规律，得到了电压幅值和相角的变化规律。然后，从理论和数值分析两个方面分别严格讨论了各相SLG故障的独特变化规律。在此基础上，提出了一种基于三相电压变化规律的故障相识别方法。PSIM仿真结果验证了所提出的变化规律，验证了所提出的故障相识别方法的有效性，保证了高阻接地故障时故障相的准确识别。
Faulty phase recognition under single-line-to-ground (SLG) fault condition is critical for some arc suppression methods in medium voltage (MV) distribution networks. Conventional methods tend to be invalid due to network asymmetry in high-resistance ground-fault condition and the difficulty of detecting phase-to-ground parameters in practice. In this paper, the variation of the three phase-to-ground voltages with the change of SLG fault resistance is analyzed in detail, and the magnitude and phase angle variation rules of the voltages are obtained. Then, the unique variation rules on SLG fault for each phase are separately and strictly discussed in theory and numerical analysis. Furthermore, a faulty phase recognition method is proposed based on the variation rules of three-phase voltages. Simulation results in PSIM verify the proposed variation rules and validate the effectiveness of the proposed faulty phase recognition method, which ensures accurate recognition of faulty phase in high-resistance ground fault.