双端输电线路故障定位方法研究

Research on fault location method of two-terminal transmission line

针对行波法在输电线路故障定位中存在的不足,提出一种基于行波固有频率的双端输电线路故障定位方法。首先,在线路的两端与中间位置分别装设电流测点,从而减小故障行波在相邻两测点之间的传播距离,进而降低定位误差。然后,通过将相应测点检测到的固有频率主成分之间的对比,判断出故障发生的区段。最后,以故障行波传播距离最短为原则计算得到故障距离。仿真结果表明,该方法能够准确的判定出故障发生的区段,具有较高的测距精度和较强的适应性。

Aiming at the shortcomings of traveling wave method in fault location of transmission lines, a fault location method based on traveling wave natural frequencies is proposed. First of all, in order to reduce the traveling distance of fault traveling wave, several current measurements will be installed in both ends of the line and the middle position, and thus the positioning error can be reduced. Then, through the comparison of the natural frequency components detected by the corresponding measurement points, the section of the fault occurrence is judged. Finally, the fault distance can be calculated based on the principle of shortest traveling distance. The simulation results show that this method can determine the fault section accurately, which has high positioning accuracy and adaptability.