| 引用本文: | 管廷龙,薛永端,徐丙垠.基于故障相电压极化量的
谐振接地系统高阻故障方向检测方法[J].电力系统保护与控制,2020,48(23):73-81. |
| GUAN Tinglong,XUE Yongduan,XU Bingyin.Method for detecting high-impedance fault direction in a resonant grounding system based on voltage polarization of the fault phase[J].Power System Protection and Control,2020,48(23):73-81 |
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| 摘要: |
| 针对谐振接地系统高阻接地故障的发生概率大、零序电压检测难度高的问题，提出了基于故障相电压极化量的谐振接地系统高阻故障方向检测方法。利用谐振接地系统高阻故障等值电路，分析了故障暂态时间内故障相电压分别与故障上、下游线路零序电流的极性关系，发现故障相电压与故障上游线路零序电流波形相似程度较高，与下游线路零序电流波形相似程度较低。据此，可以将故障相电压作为极化量，通过分析故障暂态时间内线路检测点所测零序电流与故障相电压的相似程度来进行故障方向检测。相较于以往的故障检测方法，所述方法提高了谐振接地系统高阻接地故障检测的可靠性。数字仿真与现场人工试验验证了该方法的可行性。 |
| 关键词: 相电压 极化量 谐振接地系统 高阻故障 方向检测方法 |
| DOI：DOI: 10.19783/j.cnki.pspc.200020 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(51477184) |
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| Method for detecting high-impedance fault direction in a resonant grounding system based on voltage polarization of the fault phase |
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GUAN Tinglong, XUE Yongduan, XU Bingyin
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(1. College of New Energy, China University of Petroleum (East China), Qingdao 266580, China;
2. Smart Grid Institution, Shandong University of Technology, Zibo 255049, China)
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| Abstract: |
| There are problems of high incidence of high-resistance grounding fault in resonant grounding system and major difficulty in zero-sequence voltage detection. Thus a direction detection method for a high-resistance fault of a resonant grounding system based on the voltage polarization of the fault phase is proposed. Using the high-impedance fault equivalent circuit of the resonant grounding system, the polar relationship of zero-sequence current on both sides of the fault point and the fault phase voltage during the transient process is analyzed. It is found that the voltage of the fault phase has a high degree of similarity with the zero-sequence current upstream of the fault point, while it has a low degree of similarity with the zero-sequence current downstream of that point. Given this, the fault phase voltage can be used as the amount of polarization. The direction of the fault can be detected by analyzing the similarity between the current measured at the detection point on the fault line and the voltage of fault phase during the transient process. Compared with previous fault detection methods, this method improves the reliability of the high-resistance grounding fault detection in the resonant grounding system. Digital simulation and field manual tests verify the feasibility of the method.
This work is supported by National Natural Science Foundation of China (No. 51477184). |
| Key words: phase voltage polarization amount resonant grounding system high impedance fault direction detection method |
