Resonance Analysis and Faulty Feeder Identification of High-Impedance Faults in a Resonant Grounding System
Resonance Analysis and Faulty Feeder Identification of High-Impedance Faults in a Resonant Grounding System
复制标题
谐振接地系统高阻抗故障的谐振分析和故障馈线识别
DOI：
10.1109/tpwrd.2016.2641045
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发表时间：
2017-01
影响因子：
4.4
通讯作者：
B Xu
中科院分区：
文献类型：
--
作者：
Y Xue;X Chen;H Song;B Xu
高阻抗故障（HIF）在谐振接地系统中频繁发生且难以检测。因此，迫切需要一种有效的HIF馈线识别技术。本文建立了谐振接地系统中的HIF等效电路。分析了欠阻尼和过阻尼谐振工况下暂态零序电压、暂态零序电流及其投影分量相对于母线暂态零序电压的变化规律。此外，还详细规定了谐振频率、幅度、衰减因子和其他参数的变化范围。分析比较了故障馈线、正常馈线、Petersen线圈、故障点之间零序电流的幅值和相位关系，以及它们的投影分量和正交分量相对于暂态零序电压的关系。提出了一种基于暂态零序电流投影分量大小和极性比较的故障馈线识别方法。通过仿真和现场数据验证了暂态特性的准确性和所提方法的可行性。
High-impedance faults (HIF) occur frequently in resonant grounding systems and are difficult to detect. Thus, an effective HIF feeder identification technology is urgently needed. This paper establishes an HIF equivalent circuit in a resonant grounding system. The change rule of transient zero-sequence voltage, transient zero-sequence currents, and their projection components with respect to the transient zero-sequence voltage of the bus are analyzed in both underdamping and overdamping resonance conditions. Furthermore, the variation ranges of the resonant frequency, the magnitude, the attenuation factor, and other parameters are specified in detail. The magnitude and phase relationships of zero-sequence currents among the faulty feeder, healthy feeders, Petersen coil, and fault points, as well as the relationships between their projection components and quadrature components with respect to the transient zero-sequence voltage are analyzed and compared. A novel faulty feeder identification method based on a comparison of the magnitude and polarity of the transient zero-sequence current's projection component is proposed. The accuracy of the transient characteristics and the feasibility of the proposed method are verified by simulations and field data.
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