一棵树倒下了,砰砰地拔出电线!所以所有的电都熄灭了。
然后我注意到电涌保护器延长电缆周围有黑色粉末/煤烟。它看起来像是一个小小的爆炸,周围的一切都被黑烟灰覆盖。我只是想知道那是什么吗?当电涌发生时,会发生什么吗?
我见过的电涌保护器也以类似的方式工作。一旦触发,其内部的电弧就会烧毁内部零件并产生大量黑色粉末。
其中的MOV http://en.wikipedia.org/wiki/Varistor可以充当牺牲组件。
A varistor remains non-conductive as a shunt-mode device during normal operation when the voltage across it remains well below its "clamping voltage", thus varistors are typically used for suppressing line voltage surges. However, a varistor may not be able to successfully limit a very large surge from an event like a lightning strike where the energy involved is many orders of magnitude greater than it can handle. Follow-through current resulting from a strike may generate excessive current that completely destroys the varistor.
Note: It does not take a "lightning strike", just high current at the clamping voltage that would damage or destroy it. Once damaged the surge protection that ever existed via that part is gone, although the plugs may still operate.
Posting pictures of the surge protector would be helpful.
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