接地模块对地网接地电阻的影响

介绍了非金属接地模块的组成以及降阻原理,利用接地网仿真计算模型,分析了接地模块的安装位置,接地模块个数,接地网面积以及土壤电阻率等条件发生变化时接地电阻的变化规律。地网散流时,在地网边角上的电流最大,接地模块最佳的安装位置是地网的边角;相同的接地模块对不同面积地网的降阻效果是不同的,地网越小,降阻效果越好;接地模块之间会产生屏蔽现象,影响降阻效果;土壤电阻率越高,接地模块的降阻效果越明显;在不同土壤电阻率的情况下,使用接地模块而产生的地网接地电阻下降率是相同的。

Study on Effect of Grounding Module on Grounding Resistance

The components of non-metallic grounding module and mechanism of resistance reduction was described.The regular pattern of grounding resistance at variation of number and fitting location of the grounding modules,grounding grid area and soil resistivity was analyzed using grounding grid simulation.The maximum current occured at edge corners of grounding grid at current scattering,so the grounding modules shall preferably installed at edge corners.The resistance reduction effect of the same modules differs with the same grounding modules,the less the grounding grid the better effect obtained.Shield effect may occur between grounding modules which reduces resistance reduction.The higher the soil resistivity,the better the resistance reduction effect of grounding modules.The reduction rate of grounding grid resistance using grounding modules is the same at different soil resistivity.