厂站大型地网接地阻抗精确测量实验分析

Analysis on Impedance Accurate Measurement for Large-scale Grounding Grid in Yunnan Power Substation

针对云南地区厂站的复杂地质条件特点,对厂站大型地网接地阻抗精确测量进行了实验分析,基于在现场开展的实测对比,提出了测试方法的优先选择顺序、电流极方向土壤电阻率最小化布置方法和电压极方向最均的优化布线方法,总结出了夹角法不适宜于小于30°的规律。

Analysed the impedance accurate measurements which from large-scale grounding grid based on the characters of power substation in Yunnan area in this paper. Meanwhile the order of the test method,the best way to minimize earth resistivity of current electrode and optimize the wiring of voltage pole is proposed , the law should not less than 30°in angle-offset method is summarized which base on the test results comparison.