多辅助电流极法测量地网接地电阻的研究

Research on Measuring Grounding Resistance by Multi Current Auxiliary Electrodes

针对当前三极法测量过程中存在的问题,提出了用多辅助电流极法测量地网接地电阻的思想。介绍了三极法和多极法测量接地电阻的原理,从理论上对多极法和三极法的地面电位分布进行了推导比较。推导了四极法、五极法、六极法的零位点及其补偿点的位置及N个辅助电流极时零位点和补偿点的通式。通过CDEGS软件仿真计算,对三极法、四极法、五极法和六极法测量地网接地电阻的地面电位和接地电阻值与真实值进行比较分析。结果表明,在电流极与接地网中心距离相同时,多极法的地面电位分布比三极法更接近真实的地面电位分布,并且多极法测量地网接地电阻的误差比三极法要小。

The multi-electrode method,which means that there are several current electrodes around the grounding system,is researched in order to avoid many problems from three-electrode method.The details of the three-electrode method are introduced,and the distribution of the electrical field is theoretically deduced and studied respectively using three-electrode method and multi-electrode method.The general formula of the position of zero-potential points and compensation points are deduced when there are N-electrode around the grounding system.The comparison and analysis of the measured value and true value is made using three-electrode method,four-electrode method,five-electrode method and six-electrode method,after the simulation and calculation based on the CDEGS.The results indicate that the electrical-field distribution of multi-electrode method is closer to true fact than that of three-electrode method,and the deviation from multi-electrode method is smaller than that from three-electrode method.