跨接在产品输入的LN之间的压敏电阻,此压敏电阻已经过了VDE,UL认证.
我们的L,N没有加保险的
请教DX们,这样要短路吗?
求教各位大虾:压敏电阻需要做短路测试吗
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@lovelhy
怎么没人顶呢
我来顶顶!!
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@cafetea
压敏电阻是非线性元件,如果长期挂在LN之间,可能会因逐渐老化而失效(表现为短路状态).因此,在压敏电阻前最好放保险管.压敏的老化是材料本身特性,和VDE或UL认证没有关系.
保险管选择250 10A的,过流时熔断,防止燃烧.
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@ljjwhut
压敏电阻要做短路测试的,所以压敏电阻最好放在保险丝之后.
L/N之间的surge arrestor 在IEC 60950-1里面叫functional insulation.
fuse一般是管总的电路的,在L线或N线上,而surge arrestor一般是并联在L/N间,
标准上说:an interrupting means having an adequate breaking capacity shall be connected in series with the VDR.
这个中断装置是直接与VDR串联的,可以是discharge tube 或者thermal cut-out等.因为:
NOTE 2 During the lifetime of a VDR the leakage current incrases with the number of switching cycles in the VDR. this leakage current causes a permanent and continuously incrasing temperature strss, which can cause the VDR to burn or burst.
fuse一般是管总的电路的,在L线或N线上,而surge arrestor一般是并联在L/N间,
标准上说:an interrupting means having an adequate breaking capacity shall be connected in series with the VDR.
这个中断装置是直接与VDR串联的,可以是discharge tube 或者thermal cut-out等.因为:
NOTE 2 During the lifetime of a VDR the leakage current incrases with the number of switching cycles in the VDR. this leakage current causes a permanent and continuously incrasing temperature strss, which can cause the VDR to burn or burst.
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