中国电机工程学报Issue(22)：5703-5714,12.DOI:10.13334/j.0258-8013.pcsee.2015.22.004
中性点经消弧线圈接地系统小电流接地故障暂态等值电路及暂态分析
Transient Equivalent Circuit and Transient Analysis of Single-phase Earth Fault in Arc Suppression Coil Grounded System
摘要
Abstract
For traditional transient equivalent circuit of single-phase earth fault, the effect of aerial model networks is neglected, accompanying with the lack of parameters calculation method and inaccurate position of arc suppression coil. So that it cannot be used for quantitative analysis and calculation. Firstly, a distributed parameters model including informations of both sides of fault point was established . And then, it was simplied into a lumped-Γ circuit composed by equivalent resistance, inductance including aerial and zero modes components, distributed capacitance of feeders to ground and inductance of arc suppression coil by model simplification principle. In order to meet the demonds of engineering application, a simple parameters calculation method was proposed. Contrast with traditional transisent equivalent circuit, the circuits established in this paper contain information of aerial and zero modes components, where equivalent inductance is approximately equal to the sum of zero modes and 2 times aerial modes inductance of feeder form bus to fault point. Moreover, the arc suppression coil was connected to bus, which was more reasonable. Finally, expressions of transient current were presented with different fault resistance. According to the above, the change rule of main resonance frequency, amplitude, attenuation factors were analyzed, which was benefit for the analysis of transient characteristics. Simulations and field data verify the accuracy of transient analysis. The transient equivalent circuits established in this paper have higher calculation precision.关键词
中性点经消弧线圈接地系统/小电流接地故障/暂态等值电路/模型简化/暂态分析Key words
neutral grounding via arc suppression coil/single-phase earth fault/transient equivalent circuit/model simplification/transient analysis分类
信息技术与安全科学引用本文复制引用
薛永端,李娟,徐丙垠..中性点经消弧线圈接地系统小电流接地故障暂态等值电路及暂态分析[J].中国电机工程学报,2015,(22):5703-5714,12.基金项目
国家自然科学基金项目(51477184，51077090)；国家863高技术基金项目(2012AA050213)。Project Supported by National Natural Science Foundation of China (51477184,51077090) （51477184，51077090）
The National High Technology Research and Development of China 863 Program (2012AA050213) （2012AA050213）
