使用输电线双端数据的故障测距研究

Fault Location Using Transmission Line Two Terminal Data

以分布参数做为高压输电线路的模型，对双端输电系统提出了解一次方程故障测距方法．该方法将线路两端电压电流基频分量分解成正序、负序和零序分量，首先根据不对称故障故障点处电流各序分量之间的关系，求出两端数据采样不同步角，进而通过求解一次方程求出故障位置．该方法不需迭代计算，不受系统运行方式变化和过渡电阻的影响．

Based on a distributed parameters line model,this paper present a new fatilt location method by solving the one order equation for two terminal transmission systems. The fundamental frequency voltage and current at two ends of lines are transformed into positive, negative and zero sequence quantities first, two terminal data sampling non-cynchronized angle can be acquired according to relationship of fault current sequence quantities at fault point for unsymmetrical fault, then the fault location can be determined solving the one order equation. The influences of system impedance variation ,transient resistance are excluded. The satisfactory simulation result show that the method is effective.