一种输电线路故障测距新方法

针对传统距离保护方法存在许多不足，提出了一种输电线路故障测距新方法。该方法以同母线上任一“有限长”非故障线路作为参考线路，通过比较由故障线路暂态电流行波与该参考线路暂态电流行波形成的反向行波浪涌与其对应的正向行波浪涌的极性识别来自故障方向的行波浪涌，消除了来自参考线路的暂态行波浪涌的影响。通过电磁暂态分析软件仿真计算，表明该方法不仅能够对各种故障情况进行正确的识别，而且具有较高的精确度。

New Method of Fault Location for Transmission Lines

For the disadvantages of the classic distance relay protection,a new method of fault location of transmission lines is proposed.In the new method,the arbitrary finite length line is selected as a reference line.The directional(forward and backward) travelling waves are formed by the transient currents of the fault line and the reference line.The surges coming from the fault is identified by comparing the polarity of each backward surge with that of the corresponding forward surge.The effect of surges which ...