过渡阻抗对三段式混合线路行波测距算法的影响探讨

The Influence of Transition Impedance on Traveling Wave Ranging Algorithm for Three Section Hybrid Transmission Lines

行波测距法是现阶段输电线路故障测距的主要方法之一,主要包括单端行波测距法和双端行波测距法。由于三段式架空线—电缆混合输电线路的线路结构复杂,当线路发生故障时故障暂态行波特性异常复杂。文章通过搭建海南联网工程的输电线路模型,模拟线路上同一点发生相同故障时,故障点经不同的故障阻抗接地时对行波故障测距算法的影响,分析过渡阻抗对行波测距法的影响,并得到相应的结论。

Traveling wave fault location method is one of the main methods of transmission line fault location at present,it mainly includes single terminal traveling wave ranging method and double terminal traveling wave ranging method.Three-section overhead line-cable hybrid transmission line due to the complex line structure,when the line fails,the transient traveling wave characteristics of the fault on it are very complex.In this paper,the transmission line model of the Hainan interconnection project is built.In this paper,when the same fault occurs at the same point on the line,the influence of the fault point on the traveling wave fault location algorithm when the fault point is grounded through different fault impedances is simulated,the influence of the transition impedance on the traveling wave ranging method is analyzed,and the corresponding conclusions are obtained.