DSH 1031 Crossing of triple insulated winding wire

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DSH 1031 3 `" {+ s+ t( v9 P

Crossing of triple insulated winding wire ; ^7 d1 M3 [! m  C

2.10.5.12

60950-1(ed.2);am1 2 s; j# C' M5 a; n6 v+ B

Standard(s) (incl. year) Subclause(s) No. Year
$ Y. `$ E+ s6 x! yIEC 60950-1:2005/A1
6 Y' c3 a% v1 j* [8 c7 ~2.10.5.12 DSH
1031
2012
& r6 t0 ]- {% C; b  z+ n; rCategory
OFF
Subject Keywords Developed by Approved at
6 A% C  d9 U# a, u6 s5 U7 O% qCrossing of triple
0 @. `1 I3 x: \( F0 J5 {9 kinsulated winding wire
-Triple insulated wire
- Mechanical stress
5 H$ d9 t% I  }0 ^1 h7 \7 Zrelief
- i* ^0 ~7 R- |# i- Physical separation
ETF2 2012 CTL
Plenary
, r* y8 E+ a; Z# E7 ~8 N- p% D* JMeeting
6 u& o. l# D# E  c2 T3 p9 GQuestion
Transformers in switching mode power supplies often contain triple insulated winding
wire (=TIW) (wire with extruded insulation layers). These windings typically cross
$ m7 E* Y9 I5 M) f" peach other at an angle between 45° and 90° at the exit points as marked in the
Figure below.
In the given example TIW is used for secondary circuit windings, whereas the primary
& [. f* n/ ?5 W& O% Pcircuit windings are made of enamel coated wire. Distances between the point where
1 K" W. h5 I* w" Z/ Y5 Z7 p  vTIW crosses itself and primary circuit winding wire do not comply with Basic
(respectively Supplementary) Insulation requirements.
) t; M7 b2 g: e! F' x; ]Is it necessary in the given design to provide either mechanical stress relief at the
+ E  m  {6 f9 |5 a. z, N  {% Ccrossing point(s) of TIW, or an additional insulation level (e.g., Basic
(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
9 I5 r' o8 q; P(winding)?
, w  Z* l$ W% z4 a& s/ h7 _& U: \Decision
No