用六序分量补偿过渡电阻的双回线准确故障定位方法

在深入研究双回线故障特征的基础上,提出了一种用六序分量补偿过渡电阻的双回线路故障定位方法。该方法能够准确地计算出双回线中单回线故障和跨线故障的故障距离及故障点电阻,其计算结果不受负荷及故障点两侧系统等值阻抗角不相等的影响。该方法也适用于两回线线间零序互感分布不均的双回线。该方法计算量较小,可实时地应用于双回线的距离保护和故障定位。

A NEW ACCURATE FAULT LOCATOR OF THE DOUBLE CIRCUIT LINE USING SIX-SEQUENCE COMPONENTS AT ONE TERMINAL

Having analysed fault characteristics of the double circuit line, this paper presents a new accurate fault locating method using six sequence components at one terminal. The method can calculate fault current at the fault point using one terminal six sequence currents; therefore, it can get the distance and resistance at the fault point of the fault in a single line and fault between two lines accurately. The lo- cator can be applied to the double circuit line which is built with part of it on the same pole and part of it on two poles. The method is simple in principle with small calculation and can be used for real-time distance protection and fault location of the double circuit line. Results of digital simulation are also presented.