描述
电缆屏蔽层必须一点接地,如果电缆屏蔽层两端A、B都接地,就存在地电位差,则有电流流过屏蔽层,当发生异常状态如雷击时,地线电流将更大。此外,屏蔽层、接地线和大地有可能构成闭合环路,在变化磁场的作用下,屏蔽层内有会出现感应电流,通过屏蔽层与芯线之间的耦合,干扰信号回路。
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