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|  DSH 594/06% w4 ^, r" d! L
6 h" z _: E1 m: P" F
| Creepage distances8 M# e R7 I. I- Y0 F6 d& Z3 l
| 26.2
% c' x5 o3 [! @6 H7 A | 61558-1(ed.1); h. a1 i3 u4 X& L8 Q' k" {
|
- m+ x; n7 K3 d( l; z, V# iStandard: IEC 61558-1/1997- ~8 a. l9 l; c- ~/ T
Sub clause: 26.2
/ ]) i" w1 }( G$ X% bSheet N°: 594/068 ?5 A! }: S- K1 |6 x; ^
Page: 1(1)% r: Z; c3 E5 ^, V, }4 f% ]4 k
Subject: Creepage distances
7 P7 E9 e7 A( ~/ A* l1 A+ [7 tKey words:4 F" F% E: f4 ]: ?) V7 j
- Creepage distances# f4 z p- g3 A
- Reduced value
. R2 Z& G2 ?1 h" k* w8 q- Impregnation
5 o7 p% ]9 @/ O' ]8 ]/ ?$ M3 CMeeting:
0 K: O+ o6 P. aDecision confirmed
, b9 H9 N7 d( Y' k" j+ \$ z: q) qat 44th CTL meeting
& _. c, i6 U. s4 `5 iQuestion: Clause 26 of the standard lists several requirements regarding creepage
! C3 L% l6 {' ?8 K/ tdistances, clearances and distances through insulation. In particular, paragraph 4. o2 f: V, p; x
of subclause 26.2 states: “The reduced values shown in Table 13, C.1 and D.11 x; y# q5 V& H5 p
can be used when separation is made by the use of impregnation, potting, or by
; }) ~) H' C8 lthe use of adhesive bonding tape covering the windings, provided that the tests
- f' X8 y) B; a$ c0 K+ xof 4.1.1.2.1 of IEC 60664-1 are fulfilled”. To check whether the parts are
1 w J; ]! E) y* `- g) Zadequately potted, impregnated or cemented together, the tests according to+ s% A- F( Q7 ~& f
procedure A) or B) are conducted. If a transformer is impregnated or potted on
W! n" {# S/ Q1 H2 s8 N7 Vthe outside only, and the impregnation material has not penetrated inside it, e.g.
: u2 J, S }* {# m/ f, B6 mbetween primary and secondary winding or between winding and core, can the
" f4 j% w' V( U9 N5 yreduced values of Table 13, C.1, D.1 be taken into account?
$ E( \1 D$ x$ b0 N+ nDecision: Yes, According to the IEC 61558-1, it is not required that the impregnation or- i# J7 F# \2 D" c/ |' b( T
potting material must penetrate into all parts of the transformer. The criteria0 A; S6 X' r2 q) p3 O
for acceptance is the tests described in clause 26. The second edition of IEC& i' O8 H3 G- U$ L
61558-1 is clear in this respect.8 Z) r( N9 D ]# R( P4 l T' c
* H/ ?$ u+ P" I: R4 D
& x. e5 ^4 l- D5 P* }; b |
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