基于分布参数的同杆双回线单线故障准确测距原理

针对同杆双回线线间联系紧密，不能忽略线间分布电容对测距结果的影响，该文在同杆双回线分布参数模型下，利用相序交换后双回线反向网络图中不存在系统参数的优势，提出了一种使用单端工频电气量进行故障测距的算法，该算法从原理上解决了系统阻抗及过渡电阻对测距的影响，克服了目前同杆双回线不能精确定位的问题。该算法理论分析简单，迭代求解测距方程不存在伪根问题，ATP仿真结果表明该算法具有很高的测距精度。

NEW ACCURATE FAULT LOCATION ALGORITHM FOR PARALLEL LINES ON THE SAME TOWER BASED ON DISTRIBUTE PARAMETER

Electromagnetism is strong in two lines of the parallel lines on the same tower. The distribute capacitance is necessary to be considered when do the fault location.The paper describes an accurate fault location technique for parallel lines on the same tower, which uses post-fault voltage and current derived at one line terminal. The method does not require any knowledge of source impedance, and the shunt capacitance is considered. It maintains high accuracy for two parallel transmission lines on the same tower and the locating equation has the only result. The paper presents the theory of the technique and the results of ATP simulation.