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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 lightning strikes a building, the lightning current flowing through the structural steel bar will cause electromagnetic interference to the indoor electronic system. Based on the known current distribution of branch conductors, starting from Maxwell’s basic equations, the vector’s magnetic potentials are first obtained, then the expression of the spatial magnetic induction intensity distribution is obtained, and the magnitudes of the induction and radiation components of the magnetic induction intensity are studied. . Studies have shown that in the study of electromagnetic transients when lightning strikes a building, for a lightning current source whose wave head is microseconds, the radiation component is negligible. The resulting law makes the actual calculation much easier. However, for short-wave lightning current sources, the radiation component can still not be ignored.