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在IEC60335-1:2006中的第3.36中提出定义:5 L' A; q* x" f5 `2 c3 ?& ~, b. J
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。
8 \ J4 Y$ L+ S- t2 c. R; a eClause 8.1.4:An accessible part is not considered to be live if :
1 P7 a5 h5 q: }- q/ s8 n6 i-the part is supplied at safety extra-low voltage, provided that1 ?! K& _1 f* \3 O0 ?# T, D, d
*for a.c., the peak value of the voltage does not exceed 42.4V
: U6 G2 O- C* }: x3 K9 K! \" L*for d.c., the voltage does not exceed 42.4, or
l9 r9 M4 e" i' zthe 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。& x( L2 M5 E3 o3 Y( v5 o
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。/ T" _5 k) ~4 z% V0 h
60335-1:clause16.1:在进行试验前,保护阻抗要从带电部件上断开。6 F* O" P2 P7 c. \
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。$ q. N) U: |+ F% `2 h6 T
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。+ H0 l' V1 v' O) I3 f; k
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。
9 ~, V3 [' y1 _- _0 Y9 ]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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