摘要
当雷直击建筑物时，流过结构钢筋的雷电流将对室内的电子系统产生电磁干扰。在已知分支导体电流分布的基础上，从麦克斯韦基本方程出发，先求出空间的矢量磁位，然后得出空间磁感应强度分布的表达形式，并研究了磁感应强度的感应分量与辐射分量的大小。研究表明，在雷直击建筑物时的电磁暂态研究中，对波头为微秒级的雷电流源，辐射分量可忽略不计。所得出的这一规律，使得实际计算大为简化。但是，对于短波头的雷电流源，辐射分量仍有不可忽视的影响。
When a lightning strikes directly to a building, large impulse currents flow through various conducting branches of the building's protection structure, then electromagnetic disturbance is caused within the building. Based on surge current distribution of conducting branches, vector potential was obtained by solving Maxwell's equations, then magnetic field intensity was presented in this paper. Two components including induction and radiation field were compared, and the radiation field could be neglected when current wave front time is about microsecond. The conclusion reported in the paper is very important to practice problem. But when current wave front time is less than microsecond, the radiation field shows a marked increase.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1999年第5期31-34,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家教委博士点基金
北京市自然科学基金
关键词
室内电磁场
电磁场
数值计算
建筑物
雷击
magnetic field intensity
induction field
radiation field
electromagnetic interference
