闪电连接高度对地面电场波形的影响.pdf

: .
2021 年 2 月 s (50km, 5km, 50m)
is calculated. The results show that, depending on the wavefront steepness of the current, the existence
of the downward return stroke may generate a sharp initial peak in the rising portion of the electric
fields. The sharp initial peak overshoot is defined to represent the extent of sharpness. The influence of
junction height, current wavefront steepness and downward return stroke speed on overshoot is further
analyzed. It can be seen that, as the junction height increases, the amplitude and duration of the sharp
initial peak increase. Besides, a larger wavefront steepness and a larger downward return stroke speed
tend to produce a larger initial field peak overshoot. The increase of downward return stroke speed
results in a shorter duration of initial field peak. The electric field waveforms calculated by the

国家自然科学基金（51877155，51807144，41775007）和某重大基础科研计划（2019207029）资助项目。
收稿日期 2019-12-24 改稿日期 2020-05-07

万方数据858 电 工 技 术 学 报 2021 年 2 月
proposed return stroke model are more consistent with the measured ones than the conventional models,
revealing the physical mechanism of sharp initial electric field peak.
Keywords：Lightning current, lightning junction height, initial sharp electric field peak, trans-
mission line model, wavefront steepness of current, return stroke speed


尖峰。Lin Yuntao 等在距离回击通道 50km 处[26]、
0 引言
J. C. Willett 等在 20km 处[27]以及 M. A. Haddad 等在
雷电回击模型在研究闪电电磁场与电气系统或 数十千米至数百千米的电场波形中[28]均观察到了
通信线路的耦合情况、决定雷电激发的感应电压以 初始尖峰。J. C. Willett 等和 C. Weidman 等在距
及