基于异频直线法大型地网接地阻抗的分析与测量

Analysis of Pilot-frequency Straight-line Method for Measurement in Large Ground Grid Impedance

本文提出了一种适合大型地网接地阻抗测量的异频直线法,该方法是在分析直线法与异频法原理的基础上综合二者的优点,提出了电压、电流极和异频测量频率的选取方式,通过对某水电站地网阻抗的实际测量结果验证了该方法的正确性和适用性,并总结得出了在实际测量过程中应当注意的问题,对大型地网的测量具有一定的参考意义。

This paper proposes a method for the measurement of the large ground grid impedance. It is based on analysis of principles and combining with the advantages of the straight-line method and non-power-frequency method. It investigates how to put forward the voltage and current poles as well as choice the appropriate pilot frequencies. A hydropower station ground impedance has been measured and the results verify the correctness and applicability of the method. This paper concludes some problems that should be noted. It can provide references for ground impedance measurement.