Simulation and experimental study on the effect of wind on grounding wire corona discharge process under thundercloud electric field

Abstract

Many experiments simulate the corona phenomenon on the surface of single grounding wire of transmission line in an ideal environment, without considering the influence of environmental factors such as wind. In this paper, the finite element method is used to consider the motion process of small positive ions, large aerosol ions and aerosol neutral particles. Based on the simulation results, the shielding effect between two grounding wires can be seen by comparison. Considering the wind speed from 0 m/s to 5 m/s, the grounding wire corona discharge experiment was carried out. The simulation and experimental results show that with the increase of wind speed, the corona discharge degree on the surface of the grounding wire increases, the positive ion concentration generated by the corona increases, and the corona current increases. The positive ion offset increases, the shielding effect on the grounding wire weakens, and the electric field intensity above the grounding wire increases, which increases the probability of the corona to flow beam transition. With the increase of wind direction angle, the positive ion density on the grounding wire surface increases, which weakens the spatial electric field intensity and is not conducive to the development of upward leader.