高电压技术2013，Vol.39Issue(3)：648-654,7.DOI:10.3969/j.issn.1003-6520.2013.03.021
基于斜向通道模型的雷电电磁场近场近似特性
Approximate Characteristics of Lightning Electromagnetic Field in Nearby Area Generated by Oblique Channel
摘要
Abstract
In order to obtain numerical waveform of lightning electromagnetic pulse ( LEMP) close to practical situation, we presented analytical expressions of lightning electromagnetic field on earth surface generated by oblique discharge channel by the dipole method. According to the TL model, we derived the first-order and the second-order approximate expressions of the near field and its derivative. Moreover, using a pulse function to represent the specified channel-base current, we compared the calculation waveforms of the exact expressions and approximate expressions, and it was found that, within a horizontal distance no more than 50 m from return stroke channel, the electric field and its derivative waveforms of the approximate results were essentially coincident with the corresponding waveforms of the exact results. Meanwhile, the deviation between the first-order approximate results and exact results of electric field was smaller than that of magnetic field, but the deviation between the second-order approximate results and exact results of electric field was bigger than that of magnetic field, and all the deviations mentioned above increase with the horizontal distance.关键词
雷电电磁场/斜向放电通道/偶极子法/近似特性/近场/回击模型Key words
lightning electromagnetic field/ oblique discharge channel/ dipole method/ approximate characteristic/near field/ return stroke model引用本文复制引用
王晓嘉,陈亚洲,李冰,万浩江,王琳..基于斜向通道模型的雷电电磁场近场近似特性[J].高电压技术,2013,39(3):648-654,7.基金项目
国家自然科学基金(51077132). （51077132）
