利用超定方程组的行波故障定位新方法

针对行波速度参数具有一定不确定性,而对行波故障测距结果带来一定误差影响的问题,提出利用超定方程来消除波速影响的输电线路双端行波故障测距方法。测量故障到达输电线路两端的初始行波,以及对端初始反射故障行波到达本端、本端初始反射行波到达对端母线的时间,通过时间和线路长度参数构建超定方程组,通过求解消除波速的影响。仿真结果表明,该方法不受行波波速、故障距离与接地电阻的影响,相较于传统行波测距方法有更高的准确性和可靠性。

Novel traveling wave fault location method using overdetermined equations

The uncertainty of traveling wave velocity brought the fault location measure error. In order to eliinate the influence of wave velocity, a two-terminal traveling wave fault location method for transmission lines based on overdetermined equation was proposed. This method first needed measure the arriving time of three waves, which were the travelling wave from the fault location to two terminals of the transmission lines, and the two refection waves between the opposite bus and the measure bus. Then with the parameters of the time and lines length, the overdetermined equations were constructed, whose solution could eliminate the uncertainty of traveling wave velocity. The simulation results showed that this method could effectively eliminate the influence of wave velocity, fault distance and ground resistance, and meanwhile show higher location precision and reliability in comparison with other traditional methods.