DSH 1031 Crossing of triple insulated winding wire

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DSH 1031 2 G& V+ r1 }* F! t' p' }2 w$ p

Crossing of triple insulated winding wire

2.10.5.12 6 Z; T$ _$ f  w& T7 N2 _1 ]

60950-1(ed.2);am1 5 d9 s1 {! q/ n( l( S3 f  a* ]

  ^$ c& N5 s5 a, k# fStandard(s) (incl. year) Subclause(s) No. Year
IEC 60950-1:2005/A1
: r' Y9 |, j# }+ |% X2.10.5.12 DSH
1031
  a0 g2 X: |' T0 t3 ]7 U$ X3 B2012
2 c1 m2 J1 g* `Category
% q+ [' J" B/ T3 C2 D/ ^OFF
Subject Keywords Developed by Approved at
2 m/ M/ H, T2 V/ ?5 U' Z0 f% sCrossing of triple
0 ]" |1 X: r3 n) z" S1 W) Rinsulated winding wire
- E' P- j8 o9 V. K: g1 \-Triple insulated wire
% ~) y% `  O1 {& G7 [# v- Mechanical stress
/ {* u' r. a$ ?( M' W% ?relief
- Physical separation
ETF2 2012 CTL
' ]0 s0 p: L+ b7 aPlenary
( L) ?3 v5 w) N; XMeeting
Question
7 x3 T' q* ?$ q9 u1 W# l* }( K8 V) DTransformers in switching mode power supplies often contain triple insulated winding
! U  z' ]! k$ d) ?1 t( qwire (=TIW) (wire with extruded insulation layers). These windings typically cross
each other at an angle between 45° and 90° at the exit points as marked in the
9 e" f% h* C- a; lFigure below.
In the given example TIW is used for secondary circuit windings, whereas the primary
9 n3 R) K% L( E4 pcircuit 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
( O/ Q( s4 n& u! W/ R4 W(respectively Supplementary) Insulation requirements.
4 y" F$ T0 K$ a& m& @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
. p) q) L1 L0 h% Z- p( _(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
3 c2 P  q; k( N' D9 J$ R(winding)?
' J3 ^# O- Z) Q% j: yDecision
No
  S( i; c* p# M( k; S
1 J$ `3 @& T% O
0 y: d+ ~, M4 U0 g, D+ J8 n* s8 ]