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| DSH 594/06
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| Creepage distances
" ]: Q3 j! Y! I# C+ s) s' L1 ? | 26.2; k4 {/ y- y- T. k' X
| 61558-1(ed.1)' G3 A" g1 G4 y, P0 {* o5 T
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! l+ N& ]3 y% QStandard: IEC 61558-1/1997
0 z. P8 J% A# T6 J( d# x9 bSub clause: 26.23 }" K- G! p7 X! D
Sheet N°: 594/06- n: n; a* ]6 `' o7 I7 G+ ^
Page: 1(1)
; f/ h* t4 y4 a m3 \" {. j* gSubject: Creepage distances
3 _2 Q( E4 ` O- J' j8 `Key words:
" h$ T% X, w& h5 Q- Creepage distances1 a- k, `' ^: ?% \
- Reduced value8 ^$ P$ P3 _0 T" o0 T
- Impregnation8 U7 U/ J( S' `5 ?2 i
Meeting:+ f; e- T2 A' n' G6 \
Decision confirmed
9 g% p( `. h; w# L5 F5 t# y( \$ dat 44th CTL meeting
! C# _) h9 ^$ yQuestion: Clause 26 of the standard lists several requirements regarding creepage
1 y9 |! a0 s* ]! }! U! n( Udistances, clearances and distances through insulation. In particular, paragraph 4
, a4 {6 l6 K7 g0 [of subclause 26.2 states: “The reduced values shown in Table 13, C.1 and D.18 P9 y8 J+ N+ X$ F; c# Y1 }% D
can be used when separation is made by the use of impregnation, potting, or by7 k5 G4 J! ]3 u3 E K8 \
the use of adhesive bonding tape covering the windings, provided that the tests& i( j* O: ^* K
of 4.1.1.2.1 of IEC 60664-1 are fulfilled”. To check whether the parts are
3 i: {) K u7 d/ Q* n; O! Kadequately potted, impregnated or cemented together, the tests according to
3 h' d# E- t% [- d! Uprocedure A) or B) are conducted. If a transformer is impregnated or potted on1 a* x1 C. {% V1 T' e* p9 F6 Z6 M
the outside only, and the impregnation material has not penetrated inside it, e.g./ O2 _5 b7 _4 e0 O' ]
between primary and secondary winding or between winding and core, can the" `* E9 m9 z- e$ B, S* C
reduced values of Table 13, C.1, D.1 be taken into account?
6 ]# t6 i. H7 ^, PDecision: Yes, According to the IEC 61558-1, it is not required that the impregnation or0 c* W# G& O6 ^2 `
potting material must penetrate into all parts of the transformer. The criteria' Z2 K v" j& l! @" N6 B
for acceptance is the tests described in clause 26. The second edition of IEC
0 _9 L% }. S0 m9 U. F5 }! J2 |61558-1 is clear in this respect.
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