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| DSH 594/06" f5 t& l4 E8 \! _' N
7 [( a5 } \ a5 j s$ A9 h$ ?
| Creepage distances( c; s" p. M! \. t! C; p3 G2 t
| 26.2* y B: G. w( M' ~( _
| 61558-1(ed.1)+ \* e$ U9 D8 Q; A2 k7 p3 d N! i
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* }7 ^" e" X# ]5 {2 j, gStandard: IEC 61558-1/1997: A' u) ]# y& M; {$ D
Sub clause: 26.2( n! d, ?. U M+ ^" T
Sheet N°: 594/068 C; {2 M3 f: c+ o/ p
Page: 1(1)
/ w( }) O/ d6 hSubject: Creepage distances: p* _) J. ~6 T, Z7 u+ c
Key words:
4 q2 s3 @; l+ H% e: }: R' ]. r& z- Creepage distances% `! b+ t" r% E$ A# D2 V. I" m0 c
- Reduced value
7 ~2 L* ?+ l! f6 Q% N7 S. |+ a0 \- Impregnation
& F9 X% @9 l% l8 c% B1 PMeeting:
2 \, c; U1 g$ Q' C0 [Decision confirmed
4 p$ t* }$ i( j. }. q5 n6 T+ ?- lat 44th CTL meeting; V& D, E0 a: |; S8 T5 Y; ]3 u5 m
Question: Clause 26 of the standard lists several requirements regarding creepage
6 H) F0 b/ r% q" X% Pdistances, clearances and distances through insulation. In particular, paragraph 4" S' p, i# h: Q' C4 V- ]- Y( ?7 Z
of subclause 26.2 states: “The reduced values shown in Table 13, C.1 and D.1
# n, X2 _/ P5 s9 h C* e! acan be used when separation is made by the use of impregnation, potting, or by& U. l3 k% q6 ?8 z! E$ | ?
the use of adhesive bonding tape covering the windings, provided that the tests7 W( j! x% l, y# F7 G+ n
of 4.1.1.2.1 of IEC 60664-1 are fulfilled”. To check whether the parts are# R# r- m; e1 X) d% V
adequately potted, impregnated or cemented together, the tests according to
0 U- t2 s2 h' {8 S/ v3 C' [- bprocedure A) or B) are conducted. If a transformer is impregnated or potted on3 S8 }: O, S I j2 R: h, b
the outside only, and the impregnation material has not penetrated inside it, e.g.9 s5 C/ B0 {6 z" Y$ F8 P8 S
between primary and secondary winding or between winding and core, can the
' `4 C/ C" d& @" Xreduced values of Table 13, C.1, D.1 be taken into account?
% |( t1 _# [' E# T( W3 H* c: V, c$ GDecision: Yes, According to the IEC 61558-1, it is not required that the impregnation or* y' P2 Z% c0 v* o& h
potting material must penetrate into all parts of the transformer. The criteria
; ]1 z( C0 h2 Wfor acceptance is the tests described in clause 26. The second edition of IEC
( t4 C- [7 D3 C5 h61558-1 is clear in this respect.
1 t8 D* U2 Q/ N/ X+ [ l
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