DSH 1031 Crossing of triple insulated winding wire

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DSH 1031

Crossing of triple insulated winding wire

2.10.5.12 * U( \* w+ j. \

60950-1(ed.2);am1   e& T  _0 d/ H7 g! V! y6 q' r* Q

. I1 ~# a# s7 M4 ]3 I+ gStandard(s) (incl. year) Subclause(s) No. Year
9 Y4 n+ a4 P9 @# {( U( [IEC 60950-1:2005/A1
2.10.5.12 DSH
1031
( x) k$ h: g: T. h* U# q% Y* [! Q2012
! L- L) t/ P& r' YCategory
OFF
Subject Keywords Developed by Approved at
Crossing of triple
insulated winding wire
-Triple insulated wire
5 t' A* W3 j' m. ~/ J1 P7 b- Mechanical stress
relief
+ L* M: h; \" ~4 H) S- Physical separation
/ i/ ~6 W# l5 o5 ~5 G+ E* qETF2 2012 CTL
: t9 Y4 M& Z3 {$ ePlenary
5 r% X, j& N' z1 ~0 F7 n8 w8 u3 wMeeting
- S9 U4 @* j% s, gQuestion
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
( G) @* B: G6 `5 rFigure below.
* e: Z: d1 F. C9 Y) |. `6 {$ T4 hIn 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
(respectively Supplementary) Insulation requirements.
9 p3 o3 z  e% p4 B! {4 w6 [5 FIs 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
(Supplementary)) between the crossing point(s) of TIW and primary circuit parts
4 U/ ?# l2 f1 U! u6 ^. M2 {! b(winding)?
Decision
; U: z' `  v+ k% b1 D, `No
8 s6 F) G! z4 q) t% {0 r) b/ O
: \5 h& _0 g$ E7 n
/ z7 t, }1 Q/ y) |7 q