标题: 这种工字型结构变压器能否满足UL1838-2012的第22.3.2的d)条款? [打印本页] 作者: jjlamshushushu 时间: 2014-1-24 16:06 标题: 这种工字型结构变压器能否满足UL1838-2012的第22.3.2的d)条款? 本帖最后由 jjlamshushushu 于 2014-2-8 08:34 编辑 % g' ~3 X# h' d" z0 } ( {. T) E% L7 W8 D" y F, a各位同学,如下图,这种工字型结构变压器能否满足UL1838景观灯安规? 2 ^! j H+ F& P1 A- |1 U; n也就是说,这种结构能否满足UL 1838-2012的第22.3.2的b)条款的Double insulation要求:% g8 c" ?. l; |1 [3 O r2 V G
摘录UL 1838-2012 的CL.22.3.2如下----2 ]( ?) q3 t& Z/ O9 F% X
22.3.2 Isolation between the supply and output circuit shall be provided by:$ N2 n1 [' W5 e8 J( S- N* p& V
a) A transformer with primary and secondary windings mounted on separate sections of the. l5 K- y8 j0 a, r" Q( \
core; * S1 l# l( P, l1 `1 O u& [+ Hb) A transformer complying with the requirements for double insulation in the Standard for % C) h/ L; t6 `2 ]5 g. CDouble Insulation Systems for Use in Electrical Equipment, UL 1097, or the Reference Standard' {' B3 h1 Z$ [' i
for Double Insulation Systems for Use in Electronic Equipment, UL 2097;. p( ^8 N7 \+ `- ^
jjlamshushushu 发表于 2014-1-25 11:15 " @( m; `* K/ n' i* h! @2 |
关键是要满足UL1097/2097的DOUBLE INSULATION 比较困难啊
9 `% i1 J; y% |0 Z& u6 c9 n$ l9 v. m( O4 B Y
根据UL 2097 附录A(电气设备中双重绝缘的实施指导). I. E2 v2 y0 |7 t: k/ I& _
1 b) j9 l2 ^7 |. U* u
In general, double-insulated and reinforced-insulated equipment may be considered to provide an 1 q4 C0 M, w$ D( salternative method to obtain the same level of protection from the risk of electric shock as grounded ! u: @7 @% F% Z1 \' X* [3 jequipment with the equipment grounding conductor intact. ( z6 [. Z4 \1 z+ y2 H& M( } f4 c6 U; b9 Z; R1 r4 B满足加强绝缘可以视为等效满足Double insulation.0 K6 R5 X! I* }9 D
6 i/ ^2 e3 [, I, `R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) ' `7 T7 c7 z: H) P% Q; z, P; v2 H9 s: F
满足以下即可满足UL 2097的要求:& n0 s* G9 F% d' R$ k7 v
1)漏电流满足要求:满足终端标准/0.5、0.7 MIU;( E7 B, J5 a H Y! M
2)耐压满足要求:2*终端产品标准列明值; 2 u" c! Q* L# W: T# M0 |0 \3)变压器过载满足要求; ) _/ R6 P- [. E+ {7 q9 J& A4)初次级线圈满足距离要求:2*终端产品标准列明(B)值; 3 M- I* A0 C& n! \/ M . I& F/ I% ^% g: C, j Y. Y, z结论: ) a; O; H) D( e1)满足以上4条,就可以满足UL 2097;. @, x/ h1 k2 I o ]# `; v: X
2)如图所示的结构,不满足UL 1838 C22.3.2 a)的要求; * ?: O; Y' P! O, t$ l: ~ ' C2 i x2 }/ K/ x- Z % f( A1 `0 T1 S9 |) @作者: Thor_zhang 时间: 2014-2-11 08:21
方式是算.但主要看距离是否足够.作者: jjlamshushushu 时间: 2014-2-11 09:02
Thor_zhang 发表于 2014-2-11 08:21 ' K0 A9 q' ?! s9 w A
方式是算.但主要看距离是否足够.