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|  DSH 594/06$ n% S" t: {1 y: h- _' w* H
/ K) c5 O4 R: ?7 A' R, _
| Creepage distances9 ?' o7 W8 O! R& t" u* w* u2 k
| 26.2
( B# {! b: C* N6 B; N/ C2 e" h. u | 61558-1(ed.1)- d6 f7 F& x1 A$ M O8 w
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; U3 I. V; q r& d1 N/ z) c% yStandard: IEC 61558-1/19974 V6 ~5 \: K8 h, D4 ~) u/ q( \
Sub clause: 26.2) ]% M9 X9 M* \$ R5 o
Sheet N°: 594/06% h+ G3 n- [3 f- _. U; N" Y/ h
Page: 1(1)3 O, ^6 E8 p' q% `
Subject: Creepage distances
! f5 a& C- ]" k8 {5 i+ ]Key words:5 b7 l& B9 U- k( P8 T8 N9 t0 o
- Creepage distances
$ @7 _% |8 o Z" y5 a! W. F9 U- Reduced value3 F0 S& e/ l) x& ^
- Impregnation
! w8 @/ h9 U7 K* d QMeeting:* ?" ~" ~/ j9 Z! b) l
Decision confirmed! g' h$ A' a# B
at 44th CTL meeting% N2 W2 b; |1 B
Question: Clause 26 of the standard lists several requirements regarding creepage, e" ~& k& v$ y- T( k1 i- l+ J. x
distances, clearances and distances through insulation. In particular, paragraph 4
6 ^3 R' j4 M7 w9 y7 U7 m3 D0 R' o: qof subclause 26.2 states: “The reduced values shown in Table 13, C.1 and D.1: v! c6 E, `6 p$ l; n7 V2 B
can be used when separation is made by the use of impregnation, potting, or by
& g" V& ?: e! {4 @4 Fthe use of adhesive bonding tape covering the windings, provided that the tests8 m5 ?) Z9 y6 U$ p: X6 W; J( p
of 4.1.1.2.1 of IEC 60664-1 are fulfilled”. To check whether the parts are
" Z5 j& y3 ^8 k5 I& T0 b# N1 nadequately potted, impregnated or cemented together, the tests according to
5 p" u ~+ L$ n9 A) c/ h0 ^% Lprocedure A) or B) are conducted. If a transformer is impregnated or potted on
" O9 O! a( Q6 g+ }! ethe outside only, and the impregnation material has not penetrated inside it, e.g.
- X8 z. P0 H \8 k" `between primary and secondary winding or between winding and core, can the# `7 Q, g M8 R$ W. D; I
reduced values of Table 13, C.1, D.1 be taken into account?
a' e; @) }. M aDecision: Yes, According to the IEC 61558-1, it is not required that the impregnation or
W0 Q6 D( R- b; [potting material must penetrate into all parts of the transformer. The criteria
: h9 c7 }! i# }- q5 J8 Ffor acceptance is the tests described in clause 26. The second edition of IEC; A/ ~- N8 F3 Q0 J0 y3 |. m
61558-1 is clear in this respect.$ z2 R) ~: n3 X$ w$ Y9 N
9 `8 N) B* b: s' H9 _- ~, k
0 F) a7 A9 F# ?. ?
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