放射型接地极对方形地网降阻效果研究

Research on Reduction Effect of Radiation Grounding Pole to Square Grounding Network

放射型接地极是扩大接地网面积进而降低接地电阻的有效手段,这种方式敷设方便,且能够在使用较少接地材料情况下达到理想的降阻效果。本文基于理论计算和CDEGS软件仿真,对放射型接地极对方形地网的降阻效果进行分析研究。研究结果表明,放射型接地极对方形地网接地电阻的降阻效果随其长度增加而明显增强,当放射型接地极长度等于方形地网(正方形)边长时,降阻比例为15%左右;放射型接地极长度为方形地网边长5倍时,降阻比例为50%左右。在对多根放射型接地极降阻效果进行评价时,可将各放射型接地极长度之和作为简易评价标准,并参考单根放射型接地极的降阻效果。另外,放射型接地极敷设总长度相同时,使用的接地极根数越少,降阻效果越好。

Radiation grounding pole is an effective means to expand grounding network area and reduce the grounding resistance. This type of laying is convenient,which is more effective on reducing grounding resistance. Based on theoretical calculations and CDEGS simulation,the effect of radiation grounding pole on reducing grounding resistance of square grounding grid is researched. The results shows that,the longer the length of radiation is,the more effective the radiation grounding pole is on reducing grounding resistance. When the length of the radiation grounding pole is equal to the side length of the square grid,the proportion of reducing grounding resistance is 15%; When the length of the radiation grounding pole is three times as much as the side length of the square grid,the proportion of reducing grounding resistance is 50%. When the effect of radiation grounding pole on reducing grounding resistance is evaluating,the total length of the radiation grounding pole can be used as evaluation standard. In addition,when the total length of the radiation grounding pole is equal,the less the quantities of radiation grounding pole is,the more effectively grounding resistance reduces.