基于模量网络分析的接地极线路故障定位新算法

针对直流接地极线路发生远距离、高阻接地故障时，现有故障定位算法精度低的问题，提出了一种基于模量网络分析的接地极线路故障定位新算法。基于线路的分布参数模型，建立了故障后接地极线路故障模量网络，在此基础上利用接地极线路量测端的电压、电流量计算沿线的电压、电流分布，进而得到故障点处的测量阻抗，根据故障点处测量阻抗虚部最小的特点进行故障定位。大量仿真结果表明，该算法可实现接地极线路全长范围内的准确定位，且不受故障位置和分布电容的影响，具有较高的故障定位精度。

Novel fault location algorithm based on modulus network analysis for grounding electrode line

To deal with the low accuracy problem of existing fault location algorithms when the DC grounding electrode line has a long distance and high resistance grounding fault, a novel fault location algorithm for grounding electrode line based on modulus network analysis is proposed. Based on the distributed parameter model of the line, the fault modulus network of the grounding electrode line is established. On this basis, the voltage and current distribution along the line is calculated by using the voltage and current at the measuring end of the grounding electrode line, and then the measurement impedance at the fault point is obtained. The fault location is carried out according to the characteristic that the imaginary part of the measurement impedance at the fault point is the smallest. A large number of simulative results show that the proposed algorithm can achieve accurate location within the full length of grounding electrode line, and is not affected by the fault location and distributed capacitance, and has a high fault location accuracy.