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电网技术  2009 

控制系统中导线贯通屏蔽箱体对内部电路的影响

, PP. 94-98

Keywords: 时域有限差分法,贯通导线,屏蔽,耦合电流,电磁干扰

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Abstract:

运用时域有限差分法分析了屏蔽箱体的开口结构、位置方向等对屏蔽性能的影响,以及有贯通导线存在时,干扰电磁场对箱体内部电路耦合电流的影响。研究结果表明当开孔面积一定时,开孔形状为矩形时的箱体屏蔽性能比较差,而开孔为圆形和正方形时屏蔽效果基本一样并都优于矩形开口;有导线贯通箱体时,箱体内部电路的耦合电流显著增大,且导线越长耦合电流越大。通过采用屏蔽环来抑制干扰发现,增加环的厚度可以降低干扰,而改变环的外环尺寸对抑制干扰效果不明显。

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