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; J# j+ `% \5 b+ dStandard: IEC 61558-1/1997
7 F6 M" d5 i4 n5 l' ySub clause: 26.2
- M' D; u3 M, r& _# z7 oSheet N°: 594/06
' p7 ]) a4 L& y1 pPage: 1(1)+ k ], Y* C, H3 a) I+ S- G+ L) V
Subject: Creepage distances. H7 J( T5 X/ v/ M
Key words:% v$ S' _$ b" o; {2 l
- Creepage distances
0 Y/ |+ R; n" d3 |) K- Reduced value
; S V! k: A* X3 q# Z& E- Impregnation
# p1 x* G8 |, G' Q3 I8 yMeeting:/ s$ s. {$ L2 `- H/ L. Z# X
Decision confirmed
1 K r8 m6 Y4 r, Mat 44th CTL meeting
/ ]5 s; ^+ D4 p, _: U# p( xQuestion: Clause 26 of the standard lists several requirements regarding creepage" _ I5 \6 d* |- N, n
distances, clearances and distances through insulation. In particular, paragraph 4
, J; r9 J. p; a9 }* Y8 t! g; pof subclause 26.2 states: “The reduced values shown in Table 13, C.1 and D.13 r) O! q8 z9 } f
can be used when separation is made by the use of impregnation, potting, or by+ }$ c0 t0 w/ C6 f9 ]# x
the use of adhesive bonding tape covering the windings, provided that the tests$ j0 l5 G5 J6 n/ R& ]9 D
of 4.1.1.2.1 of IEC 60664-1 are fulfilled”. To check whether the parts are
; D0 p# c; a6 [- z$ W& iadequately potted, impregnated or cemented together, the tests according to2 i$ i" W/ h1 n" x5 P$ a+ f
procedure A) or B) are conducted. If a transformer is impregnated or potted on
/ v& f' g+ M6 l" Wthe outside only, and the impregnation material has not penetrated inside it, e.g.
' J& ~! f' u" v2 Z6 }1 g5 t( ybetween primary and secondary winding or between winding and core, can the
- j0 J& ~+ O. Kreduced values of Table 13, C.1, D.1 be taken into account?9 u3 h. g3 F2 I% j8 X n: R. w
Decision: Yes, According to the IEC 61558-1, it is not required that the impregnation or
) t' g T! J7 G. x# E+ e1 epotting material must penetrate into all parts of the transformer. The criteria
! a5 \0 l& g S9 sfor acceptance is the tests described in clause 26. The second edition of IEC* z3 F/ y5 w! m+ E5 j
61558-1 is clear in this respect. M/ ^. O* c$ [
1 U7 w4 E% O* s: u8 M0 C
# r6 t, ]) N( O& f! c; y# ] |
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