利用高压输电线路两端故障录波器的不同步数据，提出利用线路两侧工频相量相位差的特点进行测距；该方法不受负荷电流与过渡电阻的影响,不需要进行故障选相和判别真伪根，EMTP仿真结果表明，算法有较高的精度。 Based on the asynchronous data of the fault recorder at both ends of high voltage transmission line, this paper proposes the use of the phase difference of power frequency phasor on both sides of the line to measure the distance. This method is not affected by the load current and the transition resistance and does not need fault phase selection And judge the true and false root, EMTP simulation results show that the algorithm has higher accuracy.