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本帖最后由 Safer 于 2014-2-7 18:00 编辑
+ b9 R. a4 C9 Yjjlamshushushu 发表于 2014-1-25 11:15 
# e6 B2 p* S Q4 _7 f2 S, d! t$ x关键是要满足UL1097/2097的DOUBLE INSULATION 比较困难啊 2 q% z6 R4 A! I6 q" y8 d6 R
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根据UL 2097 附录A(电气设备中双重绝缘的实施指导)9 K. b: e5 H3 k9 |
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In general, double-insulated and reinforced-insulated equipment may be considered to provide an
& w5 d/ H+ C: i) [$ g7 palternative method to obtain the same level of protection from the risk of electric shock as grounded$ i- \" p" Y# k3 f2 q7 r% w0 O
equipment with the equipment grounding conductor intact.
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3 J: E3 z- W. I6 g3 E/ ], O3 ?满足加强绝缘可以视为等效满足Double insulation.
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" h- e9 [! _' l' F( s2 TR和D绝缘耐压测试电压也是相同的(2*终端产品标准列明值)
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满足以下即可满足UL 2097的要求:1 R/ h) L! t0 w: \, h: h
1)漏电流满足要求:满足终端标准/0.5、0.7 MIU;
2 Q* M+ \$ @7 ?3 _$ g2)耐压满足要求:2*终端产品标准列明值;0 L7 S3 L+ L* ^ u
3)变压器过载满足要求;
# ~. F! m. x8 H3 o4 N/ U6 i4)初次级线圈满足距离要求:2*终端产品标准列明(B)值;$ |) V6 {* _* J0 E' b1 u# t
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结论:1 p. q0 x( K: u u' E" ?
1)满足以上4条,就可以满足UL 2097;
. Q& {. h! s! V- M% Y2 }* X' J2)如图所示的结构,不满足UL 1838 C22.3.2 a)的要求;0 S+ j+ G0 n4 V" i# t; \: x& C
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