DSH 594/06 Creepage distances

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DSH 594/06 ! A% {; z/ r9 \7 z2 `( A9 A

Creepage distances

26.2 * T1 i0 L5 v2 l$ S' R

61558-1(ed.1) - N& ^4 l- K4 H6 E9 W4 g

3 B' X9 l: q1 ?7 a5 l3 z3 i6 g6 iStandard: IEC 61558-1/1997
Sub clause: 26.2
Sheet N°: 594/06
0 i9 |7 [3 `4 J+ \! dPage: 1(1)
Subject: Creepage distances
Key words:
- Creepage distances
- Reduced value
- Impregnation
: q, p. k6 x& [4 A! o3 cMeeting:
Decision confirmed
at 44th CTL meeting
Question: Clause 26 of the standard lists several requirements regarding creepage
distances, clearances and distances through insulation. In particular, paragraph 4
of subclause 26.2 states: “The reduced values shown in Table 13, C.1 and D.1
can be used when separation is made by the use of impregnation, potting, or by
$ {' m% R- J# R% ythe use of adhesive bonding tape covering the windings, provided that the tests
0 ^6 b( A9 b( dof 4.1.1.2.1 of IEC 60664-1 are fulfilled”. To check whether the parts are
adequately potted, impregnated or cemented together, the tests according to
2 Q) W7 Q- z, A7 n, Q' mprocedure 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.
: h% s6 d, h( u& qbetween primary and secondary winding or between winding and core, can the
9 \3 b) i2 T) [3 lreduced values of Table 13, C.1, D.1 be taken into account?
- V  O3 Z' P+ |( [; t7 b* D% kDecision: Yes, According to the IEC 61558-1, it is not required that the impregnation or
potting 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
4 O& i. T" f2 [; V3 j61558-1 is clear in this respect.

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