谐振配电网高阻故障的非线性特性：识别故障馈线的理论基础
Nonlinearity Characteristic of High Impedance Fault at Resonant Distribution Networks: Theoretical Basis to Identify the Faulty Feeder
AI总结：
针对谐振接地配电网高阻故障馈线识别难题，本文从能量与零序电流非线性差异出发建立理论判据，并经真实10kV系统实验验证，进而指出现有方法不足及改进方向。
摘要：
馈线识别对于配电网将故障定位到特定馈线不可或缺，尤其是在测量设备不足以实现精确定位时。对于高阻故障（HIF），馈线识别要复杂得多，相关方法仍处于早期阶段。本文从理论上深入揭示了谐振接地中性点（RGN）网络发生HIF时不同馈线的特征，这是馈线识别中最具挑战性的工况。首先，从能量角度解释了HIF中存在的非线性多样性。随后，从理论上推导了健康馈线与故障馈线之间零序电流非线性的差异，并同时考虑了工业现场存在的失谐指数和阻尼比变化。之后，这些理论结论通过在真实10kV系统中实验的HIF案例得到验证。最后，基于这些理论，本文讨论了现有方法为何不够可靠，并提出了若干改进建议。
英文摘要：
Feeder identification is indispensable for distribution networks to locate faults at a specific feeder, especially when measuring de-vices are insufficient for precise locations. For the high imped-ance fault (HIF), the feeder identification is much more compli-cated and related approaches are still in the early stage. This paper thoroughly and theoretically reveals the features of dif-ferent feeders when a HIF happens at the resonant grounded neutral (RGN) network, which is the most challenging condition for feeder identification. Firstly, the diversity of nonlinearity existing in HIFs is explained from the aspect of energy. Then, the differences of nonlinearities of zero-sequence currents between healthy and faulty feeders are deduced theoretically. Variations of the detuning index and damping ratio that exist in industries are both considered. Afterward, these theoretical conclusions are verified by the HIF cases experimented in a real 10kV system. Finally, based on the theories, we discuss about why the existing approaches are not reliable enough, and suggest some improve-ments.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
