DSH 594/06 Creepage distances

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DSH 594/06 3 y" K: T$ v0 z# s" p 4 ^$ f) {. g* |6 _6 H! S

Creepage distances * n* I, o" z' g+ P0 e

26.2

61558-1(ed.1)

Standard: IEC 61558-1/1997
& O, L4 O+ i/ F! ?Sub clause: 26.2
  q- n+ f3 P$ ]4 C0 N& {7 WSheet N°: 594/06
/ F3 p7 l8 X" H, c5 W' X7 Q) @Page: 1(1)
& R5 T" Y9 S0 Z" ]/ g" {Subject: Creepage distances
5 a0 T5 D6 @( W9 k) fKey words:
# \, V+ c( t( P# P! Y9 D- Creepage distances
- Reduced value
- Impregnation
8 G7 T$ J# R% }/ z! l/ }9 ^Meeting:
" l# F6 y1 e. @" v. n* j. ~Decision confirmed
9 A$ }' e0 V- M4 Y8 lat 44th CTL meeting
Question: Clause 26 of the standard lists several requirements regarding creepage
2 M1 S- q+ |2 d/ U6 a  Tdistances, clearances and distances through insulation. In particular, paragraph 4
0 K' R: q1 k. u1 f' U5 I0 M- J' \+ ^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
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
$ |' \3 Z- ]6 I- `+ E) Yadequately potted, impregnated or cemented together, the tests according to
procedure A) or B) are conducted. If a transformer is impregnated or potted on
: e+ ^4 e1 c, i. G3 a4 Othe outside only, and the impregnation material has not penetrated inside it, e.g.
, }+ @2 Y* m* S' Vbetween primary and secondary winding or between winding and core, can the
reduced values of Table 13, C.1, D.1 be taken into account?
2 P7 J8 }+ @& R1 KDecision: Yes, According to the IEC 61558-1, it is not required that the impregnation or
6 T! y3 s1 [/ c9 b5 n$ f( epotting 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
& Z  X1 n4 M1 S! \  T61558-1 is clear in this respect.

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