| 引用本文: | 罗隆福,向 博,许加柱,陈建平,杨 俊,汪霄飞,车红卫.10 kV小电阻接地系统单相接地故障时的跨步电压仿真与实验研究[J].电力自动化设备,2013,33(6): |
| LUO Longfu,XIANG Bo,XU Jiazhu,CHEN Jianping,YANG Jun,WANG Xiaofei,CHE Hongwei.Simulation and test of step voltage caused by single-phase grounding fault of 10 kV system earthed with low resistance[J].Electric Power Automation Equipment,2013,33(6): |
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| 摘要: |
| 围绕某市10 kV配网改消弧线圈接地为小电阻接地系统的工程，对馈线首末端发生单相接地故障时的接地故障电流进行了计算分析。采用四层土壤模型，对馈线发生单相直接对地短路时的跨步电压分布进行了有限元仿真计算；并对馈线首末端均发生单相直接对地短路以及单相经横担对地短路时的跨步电压进行了实验研究。仿真与实验结果的对比表明两者基本保持一致。最后提出了降低跨步电压对人身安全的威胁的措施。 |
| 关键词: 接地 故障电流 跨步电压 单相直接对地短路 单相经横担对地短路 保护整定 仿真 |
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| 基金项目:湖南省电力公司科技项目（HEPC［2009］47） |
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| Simulation and test of step voltage caused by single-phase grounding fault of 10 kV system earthed with low resistance |
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LUO Longfu1, XIANG Bo1, XU Jiazhu1, CHEN Jianping2, YANG Jun3, WANG Xiaofei4, CHE Hongwei3
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1.College of Electrical and Information Engineering，Hunan University，Changsha 410082，China;2.Hunan Electric Power Company，Changsha 410007，China;3.Changsha Power Supply Bureau，Changsha 410015，China;4.Test and Research Institute of Hunan Electric Power Company，Changsha 410007，China
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| Abstract: |
| Ｔhe current of single-phase grounding fault at feeder end is analyzed for a 10 kV urban system earthed with low resistance. With the four-layer soil model，the distribution of step voltage is simulated by FEM（Finite Element Method） analysis software for the single-phase direct grounding fault of feeder，while the step voltage is tested for the single-phase direct or cross-arm-passed grounding fault at both ends of feeder. The simulative results are basically consistent with the test results. Countermeasures against the fatalness of step voltage to human safety are given. |
| Key words: electric grounding fault currents step voltage single-phase direct grounding fault single-phase cross-arm-passed grounding fault protection setting computer simulation |
