DSH 1031 Crossing of triple insulated winding wire

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DSH 1031

Crossing of triple insulated winding wire

2.10.5.12   X' @) T) A4 e% n& m

60950-1(ed.2);am1 ; R: t& J" V# I: U  ^" w$ Z( n

7 R1 R. Q' @" Q- {+ r, v$ M' N4 @Standard(s) (incl. year) Subclause(s) No. Year
- ^! ^/ n" t5 q. d7 J% f, ?9 JIEC 60950-1:2005/A1
; l% y8 g1 \* ~6 S% W2.10.5.12 DSH
1031
2012
Category
OFF
& k3 Z5 Z$ |' i# c8 e4 fSubject Keywords Developed by Approved at
Crossing of triple
( T* Z  R4 N5 K; ~insulated winding wire
-Triple insulated wire
9 W" p. Y' l3 v# C& u; u% |% z/ \4 c- Mechanical stress
relief
- Physical separation
* m7 E& C3 N8 \ETF2 2012 CTL
) Y0 `' B, v5 F3 v% e4 K$ B: o9 q; tPlenary
Meeting
: h& a% t# [! ?/ t9 tQuestion
Transformers in switching mode power supplies often contain triple insulated winding
wire (=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
# F, V6 q$ O' J: s$ N% ?7 O3 Q+ ?Figure below.
In the given example TIW is used for secondary circuit windings, whereas the primary
  Y9 x8 u/ j9 q" I; p- l0 rcircuit windings are made of enamel coated wire. Distances between the point where
* j# J) r9 \0 _( }TIW crosses itself and primary circuit winding wire do not comply with Basic
. P0 H  y  L( n- }: ~(respectively Supplementary) Insulation requirements.
. {4 k& P" j- S- f! q, Q% uIs 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
: r6 W2 I/ r5 l7 e- b$ ?(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
(winding)?
Decision
No
& \5 r( ~6 v/ {- o; I4 I) k
0 M$ E8 H' }! h1 H# ^