Improved Stochastic 3D Downward Leader Model for Application in Lightning Protection
In this paper, a three-dimensional, stochastic model of a lightning downward leader is proposed.The model uses the background electric field to determine the direction of propagation of the downward leader, extrapolation of the results of negative long air gap discharge experiments to obtain the critical background electric field for the development of the downward leader, and the charge simulation method for the distribution of charge in the downward leader.The calculations take into account branching of the leader channel.By choosing a suitable value of the probability exponent, the simulation results of fractal dimension and charge in the downward leader are shown to closely match observational data of lightning.Finally, practical examples are provided that demonstrate the utility of the fractal model, namely reproduction of a negative ground flash and comparison of the ground electric field with measurement results from the field, and simulation of the variability of the lightning attachment process for a lightning rod on the ground.
lightning downward leader stochastic model charge simulation method electric field fractal dimension lightning attachement lightning rod
Shijun Xie Xiangeng Zhao Franco DAlessandro
State Grid Sichuan Electric Power Research Institute,Chengdu, China Electric Power Research Institute, China Southern Power Grid, Guangzhou, China Lightning Protection International Pty Ltd Australia
国际会议
4th International Lightning Protection Symposium (ILPS2018第四届雷电防护国际研讨会)
深圳
英文
34-41
2018-10-24(万方平台首次上网日期,不代表论文的发表时间)