100-C30B00
100-C30B00
100-C30B00
(2) 屏蔽
从理论上考虑，屏蔽对变频器外壳防雷是非常有效的。但从经济合理角度来看，还是应当从设备元器件抗扰度及对屏蔽效能的要求来选择不同的屏蔽方法。线路屏蔽，即在变频器系统中采用屏蔽电缆已被广泛应用。但对于设备或系统的屏蔽需要视具体情况而定。iec提出了采用建筑物钢筋连到金属框架的措施举例。
iec1312—2作了如下描述:建筑物内部变频器系统的主要电磁干扰源是由一次闪击时的几个雷击的瞬时电流造成的瞬态磁场。如果包含变频器系统的建筑物或房间，用大空间屏蔽，通常在这样的措施下瞬时电场被减少到一个足够低的值。
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