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1 i# o3 |, l' N2 T/ u" zStandard: IEC 61558-1/19976 g+ U, Z/ V' |% l
Sub clause: 26.2
3 M" g! |( ?7 ^- V$ d# x+ e; rSheet N°: 594/068 A' k. T& D3 i
Page: 1(1)
: l# o' Z8 H$ N: ^; |Subject: Creepage distances
9 \7 E) C( t- \4 f* BKey words:/ k2 F' V& L' K# H8 s Z* v
- Creepage distances4 e( P2 t e8 c% `
- Reduced value
" @ h. R9 j: j D; b& @# a- Impregnation5 _4 S+ X. U2 P7 l7 n1 V
Meeting:
( h/ G- d- Z; m7 Q% l b3 s: }Decision confirmed1 D8 ]6 l9 e7 b1 k) H: o
at 44th CTL meeting) g- d) y* W/ B. i" w
Question: Clause 26 of the standard lists several requirements regarding creepage) e. ^; j/ ?% a! [- Y- G$ L
distances, clearances and distances through insulation. In particular, paragraph 4
8 e* u* ?) y3 v: l" O& N* f) h+ Fof subclause 26.2 states: “The reduced values shown in Table 13, C.1 and D.1( `! m! g# P4 N, z6 y
can be used when separation is made by the use of impregnation, potting, or by
5 z* l! v. S: F: O$ \% e/ Nthe use of adhesive bonding tape covering the windings, provided that the tests
5 D* t/ k: ]+ K8 E; ~9 B+ \' k; Cof 4.1.1.2.1 of IEC 60664-1 are fulfilled”. To check whether the parts are& x2 V' r" N+ E' s, Z
adequately potted, impregnated or cemented together, the tests according to
) W1 X" M' L& s' k! q, _procedure A) or B) are conducted. If a transformer is impregnated or potted on4 G- n; J O3 Y" B! V
the outside only, and the impregnation material has not penetrated inside it, e.g.+ B$ y$ J& [; o/ L( L, n; _: R! ^+ _
between primary and secondary winding or between winding and core, can the
: `) ~' I ?: r& treduced values of Table 13, C.1, D.1 be taken into account?1 \$ s0 x4 u3 `/ G$ o
Decision: Yes, According to the IEC 61558-1, it is not required that the impregnation or
0 S8 w8 K* i) J3 Jpotting material must penetrate into all parts of the transformer. The criteria3 U5 [* b0 ^5 }. I& K* r |' v4 Q
for acceptance is the tests described in clause 26. The second edition of IEC2 l" o* V: U; L" Y# q: ~- k
61558-1 is clear in this respect.; J' W$ [1 ?: E8 O- I. Y+ ]
$ `* ^. G4 S. V# Y/ b2 e% o( j
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