设备互联与地电位反弹
Equipment Interconnection And Grounding Voltage Rebound
摘要 当通信设备已经达到GB/T17626—5—99(等同IEC61000-5)《电磁兼容 试验测量技术 浪涌抗扰度》的抗浪涌要求时,设备的实际防雷能力仍然不能使人满意,其原因是设备的实际运行环境与实验室有很大的不同。设备如果接地不良,则设备端口遭雷击时地线上会有很高的浪涌;有互联关系的设备,如果各设备的接地电阻有区别的话,则端口遭雷击时会形成设备间很大的地电位差,足以导致设备互联端口的损坏;如果地线被雷击,则不同接地电阻处也会有很高的电位差,导致设备的互联端口损坏。以上情况都可以归结为地电位反弹。文章通过实验证实了地电位反弹的存在和危害,提出了防止地电位 反弹的方法。
关键词 雷击 反弹 端口 互联 地
Abstract Even if the equipment complied with the surge requirements of IEC61000-5,
its actual capability against surge voltage still dissatisfies us. Why? The operating
conditions for the equipment is very different from the laboratory. Bad grounding
connection will result in a high surge at the grounding path when lightning strike
occurs at a port of the equipment. For those interconnected equipment with different
grounding resistances, a high grounding voltage difference will come into being
between the interconnected equipment when lightning strike occurs at a port of the
equipment and the voltage difference will possibly damage the interconnection ports.
If lightning strike occurs at the grounding path, the subsequential high voltage
difference between the different grounding resistances will cause damage to the
interconnection ports. All the phenomena above can be called Grounding Voltage
Rebound. This article confirmed Grounding Voltage Rebound’s existence and negative
effects based on many experiments and brought up some solutions for preventing
grounding voltage rebound.
Keywords surge, rebound, port, interconnection, grounding
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