不受TV和TA传变特性影响的同杆双回线故障定位方法

通过对双回线环流网沿线电压分布的频域表达,推导出基于两端电流量的双回线故障定位方法其能够准确定位故障的前提是两端电流量从一次到二次的传变具有相同的传递函数。由此可得到如下结论:当两端电流互感器(TA)具有相同的频率特性时,可获得精确故障定位;当两端TA传变能力不同时,可以通过选择二者具有相同频率特性的频带或者通过补偿来实现精确故障定位;且单频率信号也能用来进行故障定位。仿真和现场录波数据验证了结论的正确性。

Parallel Transmission Lines Fault Locating Method Uninfluenced by Potential Transformer and Current Transformer Frequency Characteristics

By expressing the voltage profile along the Differential Component Net in the frequency domain, this paper reaches the conclusion that parallel-transmission-line faults can be exactly located by two terminal currents if the transfer from primary to secondary is made with the same transferring function. Then the following conclusions are drawn: Accurate fault location can be obtained if two terminal current transformers have the same transferring ability. If the two terminal current transformers have different transferring abilities, exact fault location can be chosen by selecting the frequency band at which the two current transformers have the same frequency characteristics or by compensation. Single frequency signals can also be used to locate faults. The correctness of the conclusions has been proved by simulations and field data recorded.