中文摘要：

脉冲功率电源会产生很强的辐射电磁干扰，特别是在电源电抗器附近场强很大，其产生的电磁场会直接影响电源附近测控设备以及工作人员的安全。为了有效控制电源电抗器附近干扰水平，对其电磁场进行了屏蔽试验，同时在理论分析和数值计算的基础上，结合试验数据进行了分析研究。首先设计了板式屏蔽结构，屏蔽板采用双层板结构，材料分别为硬铝和冷轧钢；用有限元方法分别计算了单层和双层板的屏蔽效果，兼顾其对原有电路参数的影响，获得了屏蔽板的结构与材料参数；然后，试验测量了屏蔽效果，并与仿真结果进行了对比分析。结果表明，高电导率材料起主要屏蔽作用，而采用的低电导率材料主要起到结构支撑作用，即铝制板对屏蔽效果的贡献最大；仿真和试验结果均表明，屏蔽后磁场峰值衰减1个数量级，因此提出的屏蔽方案能够有效抑制电源电抗器前干扰水平。

英文摘要：

Pulse power supplies generate strong radiated electromagnetic interferences, which is significant at the front of air-core reactors that could probably jeopardize surrounding devices and staff. For limiting this interference around air-core reactors, we performed experiments with shielding sheets and analyzed the results of theoretical analysis and nu- merical calculations. Firstly, we developed shield plates and used them in experiments of radiated field reduction. The plates had two layers made of different materials, namely duralumin and steel rolling plates. Then using commercial FEA calculation software, we calculated the shielding effect and the influence of the shield sheets on power supplies by taking power supply circuits into consideration, and obtained some results regarding the structure and material of shield sheets. Comparison between the experimental results and simulation indicates that the reduction of radiated field mainly comes from material with high conductivity, while the material with low conductivity supports the structure mechanically. With shield sheets, the amplitude of radiated field＇s magnetic induction is reduced by more than 90 percent, indicating that the proposed method is effective for limiting radiated electromagnetic interferences.