DSH 1031 Crossing of triple insulated winding wire

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DSH 1031 * T8 l; ~7 R) y' D: o3 V

Crossing of triple insulated winding wire ) s3 O# m2 F5 Y* o3 M" u

2.10.5.12

60950-1(ed.2);am1 & e, t. V. m( S4 c$ @) N

  s* d0 y9 m" D) v, E) d; ^Standard(s) (incl. year) Subclause(s) No. Year
IEC 60950-1:2005/A1
- _: [+ K! J. ]: _0 q2.10.5.12 DSH
6 J* b+ w0 x2 X" z1031
2012
6 T: y/ R* _- L/ Z& P: eCategory
7 I  X0 O6 ^  R6 Q. I( |- c. z" HOFF
Subject Keywords Developed by Approved at
: Z# j# S1 J) ICrossing of triple
2 Z9 e& I2 G# v3 a" tinsulated winding wire
* j$ u& r) c, k5 h+ x* r( C/ m-Triple insulated wire
( s5 i; \2 p4 D% S8 S. E- Mechanical stress
relief
- Physical separation
ETF2 2012 CTL
Plenary
9 |2 \* |  q6 n# B4 R' ^' X# m+ QMeeting
Question
: E- p0 Q4 k" w+ m% ?- @Transformers in switching mode power supplies often contain triple insulated winding
wire (=TIW) (wire with extruded insulation layers). These windings typically cross
: u3 Y: f( A/ m2 Q$ E1 r# Aeach other at an angle between 45° and 90° at the exit points as marked in the
Figure below.
1 y1 H* r+ O$ aIn 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
/ U% m1 M8 g+ n( P) pTIW crosses itself and primary circuit winding wire do not comply with Basic
(respectively Supplementary) Insulation requirements.
" u1 x1 M" d" l' s# g% ^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
: V8 Y+ B0 c) m, D6 U9 w; Y; i(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
3 v9 x) p0 C1 M# a/ F(winding)?
; |6 E6 X2 T3 \9 N( p: UDecision
6 M' V: }: |& t0 z# J+ W9 kNo
6 U& O- ^% J4 b% f

, T' {6 ^( I9 s