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/ j; n& u. F; [) Q. k! z: W4 Z6 ]Standard: IEC 61558-1/1997
& F6 s% q8 r" A. wSub clause: 26.2, @$ F, r+ q/ u: m, w5 h" z8 G+ W
Sheet N°: 594/06' z8 L% X) y/ J) z- ^; T0 b7 T
Page: 1(1)' ^7 j4 ^1 t4 [
Subject: Creepage distances
% o7 H$ o2 o% W, fKey words:. o8 t) S5 K( x$ Q% Y) d# `" S, t
- Creepage distances
# W" G) S2 ]1 s! ~6 r- Reduced value! _! x$ q; I/ A; o, K. p! c3 G
- Impregnation
( c! @. K& p2 G( w! s' B3 |Meeting:
& v$ e# q3 T* a7 u! jDecision confirmed" \: q! G: o$ _; W% B
at 44th CTL meeting, z) I2 l. S& [- ?$ N* b% u
Question: Clause 26 of the standard lists several requirements regarding creepage0 c7 o; J: M' } B; U. R) \
distances, clearances and distances through insulation. In particular, paragraph 4
" e- @4 h- Q! e: J+ M. rof subclause 26.2 states: “The reduced values shown in Table 13, C.1 and D.1) w4 q$ t! k! Q1 X6 n |" S
can be used when separation is made by the use of impregnation, potting, or by6 A7 F; c2 X7 e+ S& Z
the use of adhesive bonding tape covering the windings, provided that the tests
# K9 l- Q1 |% r5 Fof 4.1.1.2.1 of IEC 60664-1 are fulfilled”. To check whether the parts are! a3 L1 G7 S% N; F0 M6 u$ b( K# z
adequately potted, impregnated or cemented together, the tests according to
' o. t4 h& @$ n+ Bprocedure A) or B) are conducted. If a transformer is impregnated or potted on( n. S7 G! x! e1 s- b- k
the outside only, and the impregnation material has not penetrated inside it, e.g.
+ c4 y) ^* h, u5 Y' Ibetween primary and secondary winding or between winding and core, can the3 p! Z" }6 }$ L# j l+ Q8 M
reduced values of Table 13, C.1, D.1 be taken into account?4 D. S+ x8 Q- ^* X' i
Decision: Yes, According to the IEC 61558-1, it is not required that the impregnation or
. d w+ |( M f+ G, Xpotting material must penetrate into all parts of the transformer. The criteria
7 l* o3 e, o9 Q5 lfor acceptance is the tests described in clause 26. The second edition of IEC
: K" D0 V6 U) K- d61558-1 is clear in this respect.3 W' c& e/ V1 ^6 v+ b7 N b4 u
% h* X% P) ~- f+ Z* P0 A, V0 c0 V, D) t% X, m. ~9 j
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