Revision Scheme of Atmospheric Electric Field Measurement Results Considering Corona Effect

Research on atmospheric electric field distortion factors is crucial for enhancing the accuracy of lightning monitoring and warning. In this study, two different installation cases of the mill are established. Based on an established three-dimensional corona discharge model, the impact of corona discharge of the lightning rod on the ground atmospheric electric field (E) is investigated by comparing two situations with and without corona, while considering the influence of wind. In the absence of wind, state 1 represents the condition with corona, while state 2 represents the condition without corona. The results indicate the following: 1) In state 1, the measurement results of E are not affected by the rod. Conversely, in state 2, the corona discharge of the rod causes a distortion of E, and the lower the height of the rod, the higher the degree of distortion caused by the corona on E. 2) When wind is considered, the position of the mill affects the distortion of E. The distortion coefficient is ki (i = 3, 4, 5) and ki < 1. Specifically, k3 is the distortion coefficient when the mill is installed in the windward area, k4 when it is installed in the leeward area, and k5 when it is installed in the sidewind area. The smaller the ki, the greater the shielding effect. k3 exhibits the highest shielding effect, followed by k5 and k4, that leeward installation yields the greatest shielding effect, while windward installation offers the least shielding effect. 3) When the same case is considered, the greater the wind speed, the more the corona charge of the tip is released, the stronger the shielding effect on E. 4) When two different cases are adopted, the relationship between the wind speed v and the revision coefficient p is fitted. It is found that p and v show an exponential function relationship.