抗时存在严重的测量原理错误。针对这一错误，提出了一种测量输电线路零序阻抗的新型异频测量方法。该方法基于GPS 技术，同时采集异频电流注入后所有有电磁耦合的输电线路两端的电压和电流信号，在滤除工频干扰信号后，用最小二乘法求解阻抗方程组，得到线路异频下的零序阻抗，再换算到工频下的线路零序阻抗。采用PSCAD软件建立互感线路模型，并用两种异频测量方法进行了仿真测试与比较。给出了采用两种异频法测量某电网220 kV同塔双回线路零序阻抗参数的实例。理论分析、仿真测试和实测结果均表明，所提出的新型异频测量方法，测量原理正确，测量精度可满足工程测量的需要。“,”The traditional non-power frequency measurement method of transmission lines’ zero sequence impedance is wrong under strong power frequency interference environment. A new non-power frequency measurement method was proposed to correct these errors. Based on Global Position System (GPS) technology, voltage and current signals at both ends of all electromagnetic coupled transmission lines were sampled simultaneously when a non-power frequency current was injection into one of the coupled lines. After filter the power frequency signals from the sampled signals, the zero sequence impedances of lines under non-power frequency were obtained by solving the impedance equations with the least square method, and converted them into the zero sequence impedance under the power frequency. A model of transmission lines with mutual inductance was established by PSCAD and the new method and the traditional one were simulated and compared. A field measurement example was given by using the two methods to measure the zero sequence impedances of two 220kV transmission lines with mutual inductance. Theoretical analysis, simulation testing and experimental results show that the measurement principle of the new non-power frequency method is correct and the measurement accuracy can meet the needs of practical engineering measurement.