基于分布参数模型的比相式单相故障单端测距算法

高压输电线路故障以单相接地短路为主，针对此类故障开展高精度的故障定位研究具有重要意义。基于集中参数模型的单端测距算法忽略分布电容的影响，在实际故障点距测量点较远时必然带来较大的误差。针对该问题文章提出了一种基于分布参数线路模型的电压、电流比相式单端测距算法，其原理为：通过相模变换与反变换估算出沿线各点故障相电压与相电流的分布，利用线路故障相残压与故障分量电流相位差最小的特征进行定位。该算法基于工频量，对采样率要求不高，大量的ATP仿真试验验证了该算法的有效性。

A Novel Phase Comparison Algorithm for Single Terminal Fault Location Based on Distributed Parameter Model

Single-phase earth faults are in the majority of all faults occurred in EHV and UHV transmission lines,the research on accurate fault location of single-phase earth fault is significant.The lumped parameter model based single terminal fault location algorithm neglects the influence of distributed capacitance,so it brings bigger location error while fault occurs at a distant position.For this reason,the authors propose a distributed parameter model based single terminal fault location algorithm using phase comparison of voltage and current,that is,by means of phase and modular transformation and inverse transformation the distribution of voltage and current of faulty phase at all points along the line is estimated,then the fault is located according to the feature that at the faulty position the phase angle difference between the residual voltage and fault-component of current should be the least.The proposed algorithm uses power-frequency voltage and current only,so lower sampling rate is suitable and this algorithm can be easily implemented by existing protection devices.The effectiveness of the proposed algorithm is verified by a lot of ATP simulation results.