Abstract：In this paper, it is proposed to use the amplitude modulation (AM)/frequency modulation (FM) field strength meter to test the medium wave signal level to calculate the shielding effectiveness of the building against the lightning electromagnetic pulse (LEMP). Two different frequency points of medium-wave broadcast stations are selected to simulate LEMP signal source to measure signal level at different vertical and horizontal space of the building. The shielding effectiveness and attenuation amount are calculated. The linear regression analysis of the test data shows that the top floor in the vertical space has the largest attenuation of LEMP, and in horizontal space, the farther away from the window and other shielding grids, the greater the signal attenuation. It is also found that attenuation is positively correlated with signal frequency and test altitude. It provides valuable theoretical data and application support for LEMP shielding design and shielding efficiency detection of electronic system.
罗佳俊, 郭光, 吴志辉. 基于中波广播信号测量法的建筑物雷电电磁脉冲屏蔽效能分析[J]. 电气技术, 2022, 23(9): 48-53.
LUO Jiajun, GUO Guang, WU Zhihui. Analysis of building shielding effectiveness against lightning electromagnetic pulse based on medium wave broadcast signal measurement. Electrical Engineering, 2022, 23(9): 48-53.
2022, Vol. 23 
