大型地网接地电阻异频测量方法

A Research on Method of Measuring Earthing Resistance of Large Earthing Grid with Non-power-frequency Test Current

介绍了一种地网接地电阻异频测量方法 ,该方法在试验电流频率与系统工频相当接近的条件下 ,可获得稳定可信的测量结果。分析了外界干扰的来源及特点 ,结合模拟试验和现场实测结果 ,研究讨论试验电流频率以及测量引线的布置方式对测试结果的 Z,R和 X的影响。

This paper gives a method of measuring grounding resistance of large earthing grid with non-power-frequency. According to the method, we can get precise measurement result, and the frequency of test current can be very closed to power-frequency. This paper analyzes the routines and properties of interference, and discusses the influence of testing frequency and the layout of testing lead wire on data (Z,R,X) according to the data of simulation and field measurement.