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隔离变压器的二次端绕组间的电压是大于selv的限值的,那么这段电路是接地或者未接地的次级危险电压电路。如果次级危险电压电路与初级仅有基本绝缘的时候,才要求这个次级危险电压电路与SELV满足附加绝缘或者加强绝缘(不是满足基本绝缘!)。(见IEC/EN60950-1 table 2H note C)& l2 l/ X) l* I8 h& F2 e
如果SELV电路由次级危险电压电路供电,只要这个次级危险电压电路与初级是加强或双重绝缘即可。9 V# c1 h0 p& a1 @) m
If an SELV CIRCUIT is derived from a HAZARDOUS VOLTAGE SECONDARY CIRCUIT, and the
4 S; S2 R- m+ I1 e* u" IHAZARDOUS VOLTAGE SECONDARY CIRCUIT is separated from the PRIMARY CIRCUIT by DOUBLE$ X" V$ _1 }1 X! U% t* o2 d" K. Q
INSULATION or REINFORCED INSULATION, the SELV CIRCUIT shall remain within the limits given in, z: k0 o$ |+ C/ t5 i3 T
2.2.3 under single fault conditions (see 1.4.14). |
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