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|  DSH 594/06
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| Creepage distances
7 A! G+ m( I, D3 ` | 26.2
8 N/ t v) M6 A8 r/ q | 61558-1(ed.1)
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Standard: IEC 61558-1/19976 ?$ v& z8 `- t7 e( |( P1 C$ Z
Sub clause: 26.2
4 Z0 p0 ^7 \& y: X& o+ RSheet N°: 594/06
/ `) g7 d( `! g# s0 M* TPage: 1(1)$ h* Q; _! P0 q8 V
Subject: Creepage distances
; p9 k" s ^ t- wKey words:! T+ e1 _* j4 ^/ E4 k, D
- Creepage distances) l6 u+ O' f' U4 v% J: O
- Reduced value
, {( P S i; W7 q- Impregnation
2 w; i, d" E* ], P# m4 x1 LMeeting:0 ^- o4 `# c0 R' a/ B2 f
Decision confirmed
& Y0 j; u8 Z/ w. ?at 44th CTL meeting
2 l$ X0 K4 P4 Y8 V' H. h6 m- bQuestion: Clause 26 of the standard lists several requirements regarding creepage
# p7 T& N$ g% w [; B. ?3 p0 Jdistances, clearances and distances through insulation. In particular, paragraph 4
1 H0 `6 @+ X+ @of subclause 26.2 states: “The reduced values shown in Table 13, C.1 and D.1
3 V6 F* S' j6 ^% ?can be used when separation is made by the use of impregnation, potting, or by
' I+ b6 c2 e$ T7 X) e! N/ Qthe use of adhesive bonding tape covering the windings, provided that the tests$ q7 p, F# d1 s: P8 ^6 U& g' n
of 4.1.1.2.1 of IEC 60664-1 are fulfilled”. To check whether the parts are7 x6 T) B+ y" m. Q% ]5 Q
adequately potted, impregnated or cemented together, the tests according to
1 p" S3 e4 N" {+ J; L) rprocedure A) or B) are conducted. If a transformer is impregnated or potted on# H/ ^6 O; p2 E+ T) E. ^: F8 n0 t7 v
the outside only, and the impregnation material has not penetrated inside it, e.g.
# {) ?* O0 S5 m8 fbetween primary and secondary winding or between winding and core, can the
" g! p+ p. Y% r. A2 Creduced values of Table 13, C.1, D.1 be taken into account?7 {- g k- k3 H2 E
Decision: Yes, According to the IEC 61558-1, it is not required that the impregnation or
2 f. {5 x4 Z! n8 opotting material must penetrate into all parts of the transformer. The criteria1 n1 {- t6 h) R, X P$ E
for acceptance is the tests described in clause 26. The second edition of IEC* m7 k4 R: U$ L8 [9 }& Y
61558-1 is clear in this respect.
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