近场空间LEMP波形特征研究  

Study on Spatial LEMP Waveform Characteristics in Near-Field

作　　者：王李鹏[1] 陈亚洲[1] 万浩江[1] 王晓嘉[1] 

机构地区：[1]军械工程学院静电与电磁防护研究所,石家庄050003

出　　处：《电气技术》2017年第3期36-41,共6页Electrical Engineering

基　　金：国家自然科学基金资助项目(51377171)

摘　　要：为了进一步探索近场区空间雷电电磁脉冲场的波形特征,对近场区空中不同高度处的雷电电磁场与回击通道底部电流之间的相互关系进行了理论研究。基于TL模型,通过理论推导得到了近场区空间LEMP和回击电流之间的关系。对比电磁场精确表达式与其两级近似表达式的波形,结果表明:在距回击通道50m以内、高度为几十米到几百米的空间内水平电场的精确波形与其两级近似波形基本重合;在距离回击通道200m以内、离地高度500m以下的空间内角向磁场的精确波形与其两级近似波形基本重合。In order to have a further study on spatial LEMP waveform characteristics, the LEMP and the lightning return stroke channel base current were theoretically researched. According to the TL model, it was derived that the relations of spatial LEMP and return stroke channel base current in the near-field. Compared the calculated waveforms of the exact expressions and approximate expressions, and it was found that within a horizontal distance no more 50m from return stroke channel and a vertical height that was from tens meters to hundreds meters, the vertical electric field and its approximate waveforms were basically superposed. Within a horizontal distance no more 200m from return stroke channel and a vertical height no more 500m from ground, the magnetic field and its approximate waveforms were essentially coincident.

关 键 词：雷电电磁脉冲场 回击通道底部电流 近场 精确波形 近似波形 

分 类 号：P427.3[天文地球—大气科学及气象学]