基于CDEGS的金属构架雷击电磁分析

Lightning Electromagnetic Analysis of Metal Structures Based on CDEGS

为研究金属构架遭雷击时的电磁特点及其影响因素,并应用于实际建构筑物的工程计算分析,提出将CDEGS软件应用于于这种计算,并利用电路法、有限元法和实验数据的对比验证了其可行性。文中还对金属构架内雷击电磁特点和部分影响因素进行了分析,得到离雷击点越远的垂直导体分流系数越小、各导体之间区域的磁场强度远小于导体附近等结论,并给出了雷击建构筑物时室内电子设备电磁防护的一些注意点。最后对一通信塔进行了实例分析。综上,CDEGS可应用于雷击室内电磁环境评估,具有一定的科研和业务应用价值。

In order to research lightning electromagnetic distribution characteristics of metal structures and its influencing factors on one hand, and on the other hand to give engineering calculation on actual architectural structures, we put forward application of CDEGS software in the calculation and use the result of circuit method, FEM and corresponding experiment to verify its feasibility. This paper is also aimed at analyzing lightning electromagnetic distribution characteristics of metal structures and its influencing factors. It comes to the conclusion that the farther away from the lightning strike point the smaller shunting coefficient of vertical conductor it will be; magnetic strength in the area among conductors is far less than that near conductors, etc. Then some notes are given on electromagnetic protection of electronic equipment indoors when architectural structures are struck by lightning. Finally, a case analysis is given on a communication tower. In conclusion, CDEGS can be applied to evaluation of lightning electromagnetic environment indoors, with certain value of scientific research and business application.