|
7#
楼主 |
发表于 2009-12-30 16:51
|
只看该作者
引用第5楼wolfxu于2009-12-30 10:44发表的 :
0 |2 P d8 E$ _# z; O. j P+ m ^2 E9 N8 Z8 \
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
7 \/ F; b( V- o3 Y; a# ~9 Ainsulation in a transformer that provides the separation between the HAZARDOUS VOLTAGE
& J1 ~8 X: `3 w+ Z) @5 s/ oSECONDARY CIRCUIT and the SELV CIRCUIT is considered to be a single fault, for the purpose & I% V8 {% h# `, S# ^5 }/ d5 J
of applying the single fault conditions, provided the insulation in the transformer passes an9 X4 T% Q; X% [8 y, e
....... * r$ J1 n! B0 S) j( R3 q, f
8 h0 ?( R% C. ~6 W8 t5 O! N8 Q, m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??
& S! K7 A R$ u, A那么这样说的话次级SELV与初级就只需要Basic solution?? |
|