改进的双指数函数雷电流波形及其辐射电磁场的计算  

A Modify Double Exponential Base-current and Its Application in Evaluating the Lightning EM Fields

作　　者：张岩[1] 刘福贵[1] 汪友华[1] 王川川[2] 刘荣美[1] 

机构地区：[1]河北工业大学电磁场与电器可靠性省部共建重点实验室,天津300130 [2]军械工程学院电气工程系,石家庄050003

出　　处：《电工技术学报》2013年第S2期133-139,共7页Transactions of China Electrotechnical Society

基　　金：国家重点基础研究发展计划(973计划)前期研究专项课题(2012CB723306)资助项目

摘　　要：双指数波形是国际雷电防护标准IEC62305,建筑物防雷设计规范GB50057—2010和美军标MIL—STD—464规定的雷电流标准波形。因此研究双指数波形作为雷电通道基电流产生的空间辐射电磁场有重要的价值。在计算雷电辐射场时,通常会对通道基电流表达式进行求导和积分运算,使计算过程非常复杂。本文基于传输线(TL)模型,使用泰勒级数展开的方法将作为通道基电流的双指数波形进行改进,利用偶极子法推导出回击电流的辐射电磁场的解析解。该方法使求解雷电辐射电磁场过程简便,并且增加了修正因子重构雷电通道基电流波形,使计算结果更准确。In IEC62305,GB50057—2010 and MIL—STD—464 double exponential current waveform has been defined as standard base-current waveform,it is noteworthy to develop a solution for the electromagnetic fields which utilizes this waveform.In order to facilitate the integration required for deriving the field,Taylor series expansion will be used for all variable dependent exponential terms within the current waveform.This methodology greatly simplifies the integration required to solve for the electromagnetic fields in an approximated closed form.However,by utilizing Taylor series to approximate the variable dependent exponentials,the electromagnetic fields' accuracy becomes a function of the number of terms used.Consequently,a correction factor will have to be added in order to reshape the electromagnetic fields which results from the modified base-current waveform.

关 键 词：雷电 双指数函数 电磁场 间接效应 偶极子方法 

分 类 号：P427.3[天文地球—大气科学及气象学]