论文标题
谐振分布网络高阻抗故障的非线性特征：识别馈线故障的理论基础
Nonlinearity Characteristic of High Impedance Fault at Resonant Distribution Networks: Theoretical Basis to Identify the Faulty Feeder
论文作者
论文摘要
分配网络在特定的馈线上找到故障是必不可少的，尤其是当测量阀门不足以确切位置时。对于高阻碍性断层（HIF），进料器的识别更加柔和，相关方法仍处于早期阶段。本文在理论上彻底和理论上揭示了当HIF发生在谐振接地的中性（RGN）网络上时，这是馈线识别最具挑战性的条件时。首先，HIF中存在的非线性多样性是从能量方面解释的。然后，从理论上推导了健康和故障喂食器之间零序电流的非线性差异。都考虑了行业中存在的失沟指数和阻尼比的变化。之后，这些理论结论通过在实际10KV系统中实验的HIF病例验证。最后，根据理论，我们讨论了为什么现有方法不够可靠，并提出一些改进。
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.
