The Discussion of Grounding Impedance Measurement Method of Grounding Devices of Transmission Tower

In order to research the influence of different measurement methods on grounding resistance of transmission line pole tower,this article discusses the grounding impedance measurement method of grounding devices of transmission tower.By measuring the grounding impedance of different terrain,different soil,different voltage grounding devices of transmission towers with ground megohmmeter method(three electrodes method) and clamp tester method,we found that there is a great error in clamp tester method which is ruleless and can not be corrected.Colleagues must attach importance to the instance.By contrast,the authors consider that ground megohmmeter method(three electrodes method) is more accurate.