【摘要】 基于电路法计算分析近区雷击时建筑物金属构架的磁场蔽效果 ,并进行了实验验证。研究表明 ,金属构架对脉冲磁场有屏蔽效果。磁场屏蔽系数以构架网格为单位呈阶梯式分布 ,其效果是使得建筑物内的磁场分布趋于均匀。更多还原

【Abstract】 The shielding effect of the building metal cage agaist magnetic field excited by a near-field lightning strike is investigated based on circuit approach simulations.The effectiveness of the simulation is evaluated by experimental measurements.The results show that the metal cage does have shielding effect against the LEMP.Due to the effect of the induced current,the shielding factor curve features a cascade distribution.The effect is to homogenize magnetic field distribution insde the building.更多还原