使用双端数据故障定位方法的研究

Research on Fault Location Using Two Terminal Data of Transmission Line

以分布参数作为高压输电线路的模型 ,使用线路两端电压、电流的正序分量 ,对高压输电线路短路故障提出了一种新的测距算法。该方法两端数据不必同步采样 ,短线路故障直接取 tan hγχ≈γχ,先求出不同步采样角 ,再计算出故障位置 ;而对长距离输电线 ,则提出一个修正系数来修正 tan hγχ≈γχ的误差 ,通过一欠迭代计算获得准确的故障位置。其测距精度不受系统运行方式变化和过渡电阻的影响。仿真计算表明该方法有效。

Based on the distributed parameter model for transmission line, a new fault location method for short circuit fault of the power transmission line is presented. In this method only the positive sequence components of voltage and current of two terminals are used, and the synchronization of current and voltage sampling is not needed. If the transmission line is short, adopting tanh γχ≈γχ , unsynchronized angle is obtained first, and then calculate fault location. For long transmission lines, a factor k is presented to correct the error by tanh γχ≈γχ , and fault location can be accurately obtained by one or two iterative calculations. The location accuracy is not influenced by the operating mode of the system, and the variation of system impedance and transient resistance. The simulation result shows that this method is effective.