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在IEC60335-1:2006中的第3.36中提出定义:/ z# y; Z) Y7 s* ^6 N" h
Protective impedance: Connected between live parts and accessible conductive parts of Class2 constructions so that the current, in normal use and under likely fault conditions in the appliance, is limited to a safe value.连接在带电部件和2类结构的易触及导电部件之间的阻抗,在正常使用中及器具出现可能的故障状态时,它将电流限制在一个安全值。& U( I7 y1 g9 r+ K2 [: ~: {# v! f
Clause 8.1.4:An accessible part is not considered to be live if :- J$ r) c# }/ K( s
-the part is supplied at safety extra-low voltage, provided that0 Z; ]2 e! F- w. R" D% E; z
*for a.c., the peak value of the voltage does not exceed 42.4V. ]$ x; ?$ h a& Q
*for d.c., the voltage does not exceed 42.4, or ) S; j" Y1 | S" R4 _4 t: `
the part is separated from live parts by protective impedance.以下是如有保护阻抗的情况下,它的电流限值,有时间自已去看看此条款。! G1 \6 D0 \1 o5 U' l* i- e
60335-1:clause13.1:在进行试验前断开保护阻抗和无线电干扰滤波器。& N+ w* a$ N: [1 ]
60335-1:clause16.1:在进行试验前,保护阻抗要从带电部件上断开。
1 q: z2 @/ Z. F! q% c! y9 ^60335-1:clause19.11:任何流过保护阻抗的电流都不应超过规定的限值。' ~0 a0 J8 d9 I& m1 }) Y. B: Y
60335-1:clause22.27:应采用双重绝缘或加强绝缘将由保护阻抗连接的各个部件隔开。
n# u1 H X( p1 c N" w8 J在IEC60384-14:保护阻抗应至少由两个单独的元件组成,这些元件在阻抗在器具的寿命期间内不可能有明显的改变。3 k. |; |) M$ f3 {3 C
通过上面标准的引用,相信大家心里应该有答案了吧。 |
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