【摘要】 给出了一种仅利用两端暂态电流进行单回线故障定位的时域方法.该故障定位方法采用分布参数模型,在故障分量网络中,利用双端电流计算得到的沿线电压分布在故障点处时时相等,建立了故障定位方程.利用最小二乘法分别求取不同距离下两侧系统等效阻抗,并根据故障点处两侧系统等效阻抗值代入故障定位方程后所得的偏差值最小,来实现故障定位.定位算法所需数据窗短,适用于快速跳闸的场合.故障定位无须电压量,定位精度不受电压和电流互感器传变特性差异的影响.仿真验证结果表明,该方法测距精度高,可实现全线范围内的故障定位.更多还原

【Abstract】 A novel time-domain algorithm for locating faults on single circuit transmission lines is presented.Based on the distributed model,in pure fault component network,the voltage distributions can be calculated by current of each terminal,and then the fault location equation can be established according to the equal voltage distribution from two terminals at fault point,and the least square method is used to obtain the system impedances in different fault distance.And the fault location can be realized by searching the minimum of fault location function with system impedances.The simulations show that the proposed algorithm has a perfect locating accuracy,and can locate the faults from local terminal to remote terminal.The location algorithm only needs a short data window,so it can be used in the case of high-speed tripping.No voltage is used in this novel algorithm,and its locating accuracy is free from the influence of the transfer characteristic difference of voltage-transformer and current-transformer.更多还原