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标题: DSH 1031 Crossing of triple insulated winding wire [打印本页]

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作者: 小米    时间: 2012-11-6 17:57
标题: DSH 1031 Crossing of triple insulated winding wire

DSH 1031

Crossing of triple insulated winding wire

2.10.5.12

60950-1(ed.2);am1

& d; h1 T% L/ m) _" g, z7 J4 VStandard(s) (incl. year) Subclause(s) No. Year
IEC 60950-1:2005/A1
2.10.5.12 DSH
1031
2012
Category
8 e: S% U0 E% H+ g1 {OFF
Subject Keywords Developed by Approved at
Crossing of triple
insulated winding wire
: \# ~) y7 J! r3 d( X. P$ j9 h-Triple insulated wire
. _  F8 E4 D% D8 v- Mechanical stress
+ j2 c3 ]% H3 R+ crelief
- Physical separation
- Q$ i9 J6 J: t& G0 R2 {* g) H* ?3 mETF2 2012 CTL
3 v3 Y7 O8 }/ z! c- C: i. [Plenary
Meeting
Question
Transformers in switching mode power supplies often contain triple insulated winding
$ H( z/ ?0 o1 [* p( Nwire (=TIW) (wire with extruded insulation layers). These windings typically cross
) p& |* Q% \& ^0 i+ eeach other at an angle between 45° and 90° at the exit points as marked in the
  h3 A0 c: i5 G5 H4 n+ q3 LFigure below.
& ~! I) d% R0 n  n; X2 HIn the given example TIW is used for secondary circuit windings, whereas the primary
circuit windings are made of enamel coated wire. Distances between the point where
TIW crosses itself and primary circuit winding wire do not comply with Basic
! W* c; C5 g9 @% i  \(respectively Supplementary) Insulation requirements.
% B1 J9 s) Y# @- n% RIs it necessary in the given design to provide either mechanical stress relief at the
  q& `# ?* {" m4 l  m# P# g* Y- Pcrossing point(s) of TIW, or an additional insulation level (e.g., Basic
4 l$ o5 M8 t' Y% K+ X(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
0 n- c" F9 k3 P- y, [2 ](winding)?
Decision
No
* m, F& w4 Q7 y$ h( U
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