防雷接地电阻的测量及偏离真值的分析

Measuring Lightning Grounding Resistance and Analyzing Its Deviation from Truth Value

针对站场、阀室防雷检测工作中经常出现接地电阻值读数不稳定、偏大或偏小、甚至出现检测值为负值(即偏离真值)的情况,根据接地电阻测试仪原理,阐述了防雷装置检测的方法,分析了造成防雷装置接地电阻测量值偏离真值的几种常见原因,并分别提出了避免或减小接地电阻值偏离真值的方法。

In allusion to unstable,deviant,even negative reading values of grounding resistance in lightning protection detection for station site or valve chamber,this paper expatiates on the detection methods of lightning protection devices based on the working principle of grounding resistance meter,analyzes several reasons of grounding resistance reading deviation from its truth value,and provides the methods to avoid or reduce the deviations.