DSH 1031 Crossing of triple insulated winding wire

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DSH 1031 1 n  n) Z+ y9 d  e' b& K4 V

Crossing of triple insulated winding wire

2.10.5.12

60950-1(ed.2);am1 + ]3 ?7 Z/ O, d3 Q1 S/ u

( K/ ?! A+ d2 y- ]/ ^0 ?* t: b: P, HStandard(s) (incl. year) Subclause(s) No. Year
IEC 60950-1:2005/A1
$ t/ v0 O5 l7 k% R2.10.5.12 DSH
1031
2012
Category
8 |/ `0 M2 T* q  M% b0 B2 r- R& `! DOFF
Subject Keywords Developed by Approved at
Crossing of triple
insulated winding wire
-Triple insulated wire
9 k. C" U+ {8 j  p) j- Mechanical stress
8 d$ K5 B) y+ ^& [* z% Yrelief
4 J4 @7 K7 i+ ?- Physical separation
8 t* w) O# K# eETF2 2012 CTL
5 e3 g  s) A6 c$ Q- y0 YPlenary
Meeting
& p5 Q( t) H* q0 q% aQuestion
$ v( M$ J9 q  a" W( a1 zTransformers in switching mode power supplies often contain triple insulated winding
wire (=TIW) (wire with extruded insulation layers). These windings typically cross
" c- B  D# P* v$ n. w2 ueach other at an angle between 45° and 90° at the exit points as marked in the
) U4 N! ~1 V6 d9 K) H" ~7 O: VFigure below.
In the given example TIW is used for secondary circuit windings, whereas the primary
; q* d) G0 N" ^1 Qcircuit windings are made of enamel coated wire. Distances between the point where
; @. b5 g# E9 H- `3 x6 ETIW crosses itself and primary circuit winding wire do not comply with Basic
(respectively Supplementary) Insulation requirements.
Is it necessary in the given design to provide either mechanical stress relief at the
crossing point(s) of TIW, or an additional insulation level (e.g., Basic
(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
(winding)?
0 o8 V/ x/ t4 G( iDecision
! A7 V8 P# V: k3 M" DNo
. g. N3 x' B9 J& D! Z' {8 B* k% Z% _

' v  I; ~1 t# H" V1 P