大型接地网内部接地电阻测量探讨

Discussion on Grounding Resistance Measuring Inside Large Network

介绍了接地体周围的电压降和电位分布,阐述了接地电阻测量过程中采用缩短布线距离的方法和大型接地网内部采用短线测量的方法,探讨了辅助接地极与零电位区域的位置关系,分析了辅助接地极位置对测量数据的影响。提出接地电阻测试应严格遵循GB/T 21431—2015《建筑物防雷装置检测技术规范》中布线距离的要求,以提高检测数据的科学性和准确性。

The voltage drop and potential distribution around the grounding body were introduced. The grounding resistance measuring methods of shortening wiring distance and using short line in large grounding grid were elaborated.The position relation between the auxiliary grounding electrode and the zero potential area was discussed,and the influence of the auxiliary grounding electrode position on the measurement data was analyzed. It is pointed out that the grounding resistance measurement should strictly follow the wiring distance requirement of national standard GB/T21431—2015,in order to improve the scientificity and accuracy of measuring data.