DSH 1031 Crossing of triple insulated winding wire

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DSH 1031 ; c- R9 P& x' {+ i

Crossing of triple insulated winding wire

2.10.5.12 * r6 p% ?# d& E3 s& V

60950-1(ed.2);am1

Standard(s) (incl. year) Subclause(s) No. Year
: v7 x7 L" i" r; }) E6 Z+ }IEC 60950-1:2005/A1
2.10.5.12 DSH
7 L; V* p1 b! _) D# ^8 f% y4 R1031
* o; u$ v1 s3 M2 E. ]% T. K2012
8 I8 K0 P; n& y. R7 F5 ?+ J& ECategory
* a. ^% j1 P$ J% C" b; e# ?/ J( n# wOFF
& N- t7 r/ v0 q$ A6 aSubject Keywords Developed by Approved at
) K' o- u. E1 [- Z  cCrossing of triple
' P, m  }( M, J9 W: finsulated winding wire
( C7 K; e8 W- T% g* ?, o6 U-Triple insulated wire
5 L% L2 z3 S; b' y- Mechanical stress
relief
( v) }4 h. F8 n5 O8 _- Physical separation
/ R6 ^; y. V. H; E4 TETF2 2012 CTL
2 t8 l7 b( j( cPlenary
4 h) L4 p0 C2 `" y6 D, @Meeting
; C5 O* I& W! I+ Z$ }: c; ]; k* R: eQuestion
Transformers in switching mode power supplies often contain triple insulated winding
2 f; W/ j% b) l1 R/ ewire (=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
: C3 M0 U: m: K' L: S3 L4 dFigure below.
# z4 L8 d! M$ Y: E+ l: b1 VIn 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
TIW crosses itself and primary circuit winding wire do not comply with Basic
6 _  J1 T/ K2 }: }# U* P( |(respectively Supplementary) Insulation requirements.
7 s$ p( b/ J9 X3 C4 oIs it necessary in the given design to provide either mechanical stress relief at the
0 S8 I8 _2 ]: b; Q! Gcrossing point(s) of TIW, or an additional insulation level (e.g., Basic
' s2 F0 z2 ~: d(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
(winding)?
Decision
No


& n* V" k5 j" t7 w+ u% ]