同杆4回线故障选线方法

对4回线所有单回线故障进行了推导与分析，分析表明，当故障发生在某一回线上时，无论是哪一种类型的不对称短路故障， E，F，G，H这4序分量之间存在恒定的幅值与相位关系，而当故障发生在不同回线上时，各序分量之间则有不同的幅值与相位关系。利用这个特点提出了一种 4回线发生单线故障时的故障线路识别方法。对4回线的各种单回线故障进行了大量的EMTP仿真，仿真模型包括理想对称的4回线路和实际运行的不完全对称4回线路，结果都验证了所述故障选线方法的正确性。

Method for Fault Line Selection of Four Jointed Parallel Lines on the Same Tower

An analysis made of all kinds of single line faults with four jointed parallel lines on the same tower shows that there exist fixed relationships of magnitude and phase between the sequence components E,F,G,H whatever the asymmetrical short circuit fault on a certain line,while there will be different relationships of magnitude and phase between the above four sequence components when the fault occurs on different lines.Based on this finding,a method for faulty line identification during occurrence of a single line fault is proposed.The results of many EMTP simulation tests with both symmetrical and asymmetrical line models show the correctness of the method.