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发表于 2009-12-30 16:51
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引用第5楼wolfxu于2009-12-30 10:44发表的 :4 x. S- c2 y. \# l% x2 N
) E( e' `+ q H其实如果再仔细的看一看。标准中还有这么句话“In such a case, the short-circuiting of the
& U$ ?# q" {6 G8 jinsulation in a transformer that provides the separation between the HAZARDOUS VOLTAGE* x& x; W+ _+ h, X7 |) O- F$ _$ }0 H5 v
SECONDARY CIRCUIT and the SELV CIRCUIT is considered to be a single fault, for the purpose / U, I( ^( C- s: w! G5 g
of applying the single fault conditions, provided the insulation in the transformer passes an/ S1 e# o1 Q( x8 f- F
....... $ s2 o7 ]$ a* t" ] }
2 m) P" ~8 v2 ]- c5 D我明白你的意思了~~~但是我做一个假设,,,中间一个是变压器,左边是220VAC进来,而变压器右边直接就是12V了(也就是说后面整个都是SELV),那咋办??? 那我SELV本身肯定满足后面两个条件(正常和故障电压满足要求),再满足第一个条件(与一次电路基本绝缘)的话就OK了??
% W/ R' I6 a4 ^" u L( m( F k# Y* i: d那么这样说的话次级SELV与初级就只需要Basic solution?? |
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