电磁屏蔽模型房接地性能实验研究

接地是建筑物实现宽频电磁屏蔽的重要技术措施,而导电的屏蔽功能层与接地系统电连接后也反过来影响接地的性能指标。采用导电混凝土为主料制作接地电极和电磁屏蔽模型房,测试单屏蔽模型房悬空、单电极-单屏蔽模型房接地以及单电极-双屏蔽模型房并联接地3种情况下的接地电阻变化规律。实验发现,屏蔽功能层本身可以等效为一个电阻,与接地系统并联后可以有效降低接地电阻;屏蔽功能层面积越大,电阻降低越多。实验结果可以为建筑物电磁屏蔽工程的接地设计与实践提供参考。

Experimental Research on Earthing Efficiency of Electromagnetic Shielding Model House

Earthing is an important technical measure,by which the building actualizes broadband frequency electromagnetic shielding,while electric shielding function layer electrically connected to the earthing system also has influence on the capability index of earthing in reverse.The conductive concrete,which is served as primary material,is used to prepare the earthing electrode,manufacture the shielding model house,and test the changing principles of the earthing resistance in the three cases as shielding model house hanging,shielding model house earthing and parallel connection earthing of two shielding model houses.The experimental results show that shielding function layer can be equivalent to a resistance,and can reduce earthing resistance efficiently while it parallelly connects to the earthing system.The bigger the area of the shielding layer is,the more the reduced value of the resistance will be.The results can provide reference to the earthing design and practice of building electromagnetic shielding project.