Analysis of Temporary Overvoltages During Open-Phase Faults in Distribution Networks With Resonant Grounding
Analysis of Temporary Overvoltages During Open-Phase Faults in Distribution Networks With Resonant Grounding
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DOI：
10.1109/tpwrd.2014.2327074
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发表时间：
2015-02
影响因子：
4.4
通讯作者：
Aaron Kalyuzhny
中科院分区：
文献类型：
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作者：
Aaron Kalyuzhny
分析了谐振接地配电网在非全相运行时可能产生的暂态过电压。在断相状态下记录的高过电压超过了现有理论所对应的过电压。对暂态过电压进行了详细的分析研究。推导了中性点电压的闭合表达式。得到了最大相对地过电压的条件。介绍了33 kV谐振接地配电网非全相故障的案例研究。分析了TOV对配电馈线数量、馈线负载、失谐因子、附加阻尼因子以及电压互感器饱和度的依赖关系。考虑了减少TOV的补救措施。失谐的消弧线圈进行了比较与永久连接的瓦特电阻并联的消弧线圈。
This paper analyzes the temporary overvoltages (TOVs) that may appear in open-phase states in distribution networks with resonant grounding. The high overvoltages recorded during the open-phase states exceed the overvoltages corresponding to the existing theory. The detailed analytical study of the temporary overvoltages is performed. The closed-form expression of the neutral voltage is derived. The conditions for maximum phase-to-earth overvoltages are obtained. The case study for open-phase faults in the 33-kV resonantly grounded distribution network is described. The dependence of the TOVs on the number of distribution feeders, on the feeder loading, on detuning factor, on the additional damping factor, as well as on the saturation of the voltage transformers are analyzed. Remedies for the reduction of TOVs are considered. Detuning of the Petersen coil is compared with the permanent connection of the wattmetric resistance in parallel to the Petersen coil.