DSH 1031 Crossing of triple insulated winding wire

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DSH 1031 ; N; K. ?4 h9 g! M/ X0 e2 C * W* u% B6 W! a( x, ?

Crossing of triple insulated winding wire

2.10.5.12

60950-1(ed.2);am1 ! Y" |9 J" ^7 r& _

* Z. A# x4 N( C& h. c& ^" R  J7 rStandard(s) (incl. year) Subclause(s) No. Year
IEC 60950-1:2005/A1
2.10.5.12 DSH
1031
5 d5 n) V/ L0 q2 Q2012
# s: ^  i: a0 bCategory
$ f) C, x+ i7 t* G3 A; }6 iOFF
Subject Keywords Developed by Approved at
) G$ Z, v( ]4 \* _  {; g: DCrossing of triple
insulated winding wire
+ O3 s; `2 C( W7 T7 D-Triple insulated wire
- Mechanical stress
6 p. q( M: Q3 V2 k  h1 z7 ~8 Yrelief
- Physical separation
% T4 Q# t" b, ^# J, jETF2 2012 CTL
) e# n; T3 B7 k3 s% uPlenary
Meeting
5 d. v0 h: W0 X/ ?) N2 mQuestion
Transformers in switching mode power supplies often contain triple insulated winding
# K  V8 r" W; u8 U, ywire (=TIW) (wire with extruded insulation layers). These windings typically cross
9 v1 y  M8 I6 O3 H% Reach other at an angle between 45° and 90° at the exit points as marked in the
Figure below.
5 R6 z, F' H% w. lIn the given example TIW is used for secondary circuit windings, whereas the primary
' ?( E" d7 C# _  [8 M. Kcircuit 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
(respectively Supplementary) Insulation requirements.
4 s. O: L+ d: l- AIs 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
: W; {, j; _+ V0 d% e/ D, @(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
8 Z& i7 g1 U1 [! g, _: }, \(winding)?
8 u+ Z6 W4 l) S* I# D/ K9 ]Decision
No
2 @- \. X/ s/ v

- r, o: M  T5 P9 M& m