DSH 594/06 Creepage distances

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DSH 594/06

Creepage distances : @. a% z5 P4 ]1 h3 Q% w9 f. N

26.2 % Z( X7 h+ L+ `, {5 \: V6 L

61558-1(ed.1) / w0 w2 E+ j1 V

Standard: IEC 61558-1/1997
Sub clause: 26.2
& p- F& }2 c) ?. W+ PSheet N°: 594/06
2 v5 A3 D, g* n& \Page: 1(1)
Subject: Creepage distances
Key words:
! S$ O! V' ]& h" |: s- Creepage distances
2 X& V3 e: Y6 v$ o$ K2 w2 ~- Reduced value
- Impregnation
2 l6 L. n6 H8 O9 j0 ]/ {Meeting:
: w5 n: O: P. k( ?" XDecision confirmed
at 44th CTL meeting
9 e, O& [" \. K  kQuestion: Clause 26 of the standard lists several requirements regarding creepage
distances, clearances and distances through insulation. In particular, paragraph 4
" J  u9 F1 i! t4 \+ E- h& eof subclause 26.2 states: “The reduced values shown in Table 13, C.1 and D.1
+ q2 F# S2 Y5 W/ vcan be used when separation is made by the use of impregnation, potting, or by
the use of adhesive bonding tape covering the windings, provided that the tests
of 4.1.1.2.1 of IEC 60664-1 are fulfilled”. To check whether the parts are
. b6 K" l+ b( d9 F; W- ~adequately potted, impregnated or cemented together, the tests according to
procedure A) or B) are conducted. If a transformer is impregnated or potted on
the outside only, and the impregnation material has not penetrated inside it, e.g.
between primary and secondary winding or between winding and core, can the
reduced values of Table 13, C.1, D.1 be taken into account?
% y6 q$ I0 E" ?/ D. [7 DDecision: Yes, According to the IEC 61558-1, it is not required that the impregnation or
& p. c3 p  y, V3 V. J$ J) H2 ~% h& {: Kpotting material must penetrate into all parts of the transformer. The criteria
for acceptance is the tests described in clause 26. The second edition of IEC
2 k1 Y" U# J/ ^" R$ \# j61558-1 is clear in this respect.


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