Revision Scheme of Atmospheric Electric Field Measurements Considering the Corona Effect

Research on atmospheric electric field distortion factors is crucial for enhancing the accuracy of lightning monitoring and warnings. In this study, two mill installation cases were 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) was investigated by comparing two situations, with and without corona, while considering the influence of wind. In the absence of wind, State 1 represented the condition with corona, whereas State 2 represented the condition without corona. In State 1, the measurement results of E were not affected by the rod. Conversely, in State 2, the corona discharge of the rod caused a distortion of E; the lower the height of the rod, the higher the degree of distortion caused by the corona on E. When wind was considered, the position of the mill affected the distortion of E. The distortion coefficient was k_i (i=3, 4, 5) and k_i<1. Specifically, k₃ was the distortion coefficient when the mill was installed in the windward area, k₄ when it was installed in the leeward area, and k₅ when it was installed in the sidewind area. The smaller k_i, the greater the shielding effect. The highest shielding effect was exhibited by exhibited, followed by k₅ and k₄. The leeward installation yielded the greatest shielding effect, whereas the windward installation offered the lowest shielding effect. When the same case was considered, the greater the wind speed, the more the corona charge of the tip was released, and the stronger the shielding effect on E. When two different cases were adopted, the relationship between the wind speed (v) and the revision coefficient (p) was fitted. The values of p and v exhibited an exponential functional relationship.