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标题: DSH 542 Application of Annex U and 2.10.8 to spirally wound insulation required [打印本页]
作者: 小米    时间: 2012-11-6 16:40
标题: DSH 542 Application of Annex U and 2.10.8 to spirally wound insulation required
DSH 542* Q" w4 S8 k0 V1 v; q
Application of Annex U and 2.10.8 to spirally wound insulation required to be treated as a cemented ...7 d1 s9 e9 A7 T- d  ]9 z
2.10.5.4, Third paragraph
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Standard:3 h- U4 V1 w# R( d9 }( j& p  N2 f
IEC 60950-1, ed. 1, X4 s+ j9 |+ D1 O
Sub clause:
5 v0 a$ e1 U7 f4 s1 O9 N2.10.5.4, Third paragraph
+ [! b% L% {: W+ _  S; |Dec. No.
& t8 q( |/ F/ p4 EDSH-542
' [7 I; g4 [( B% ]' Q! i% BSubject:+ E) r) _% c* r3 h0 ]2 ^
Application of Annex U and 2.10.8 to
) n* \: W, f  j1 ]spirally wound insulation required to be
0 P1 E/ f$ i; j- ~treated as a cemented joint. a8 W" B# c/ Q+ p$ {+ i/ y0 x
Key words:
+ p; Z" @5 U# M1 N! I* g9 t- b8 Nspirally wound insulation;, [) n: z8 l2 l% o  n7 D
cemented joints;
. C) k. Y% V# P1 D* h( B' ]Annex U.24 d2 K, `9 J, D0 d& `
Decision of:1 t8 z- |# S. ]2 ~$ D
40th CTL meeting /2003
; R( i9 A5 b5 rQuestion:3 x/ h& |/ w+ d0 h
When applying the 3rd paragraph of 2.10.5.4, what is the intent of the requirement for spirally wrapped  R6 v3 I- D) A, [! ~& P! s9 d- s
insulation (tape) when the CLEARANCES and CREEPAGE DISTANCES between layers, as wrapped, are# M) q5 _5 G4 m: Z
less than the required minimum value for Pollution Degree 1?; L" F( \7 h3 |7 S1 X3 k
Decision:3 x' y, i* a1 B' I" p1 Z
The intent is, if the CLEARANCES or the CREEPAGE DISTANCES between layers, as wrapped, are less than
, X) G- b0 q# C$ j2 K2 T. lthe required minimum value for Pollution Degree 1, the spirally wrapped insulation should be sealed and pass
- I& A3 p2 c* y& J" vthe tests of both:1 c& ~# x2 k  [5 X( ?! g
· Annex U, which requires an electric strength test per Annex U.2 at the voltage specified in U.2;
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5 t" k4 w- L$ w/ S· 2.10.8, which requires an electric strength test of 1.6 times the values in 5.2.2 after the testing in 2.10.8.1 H& J: g/ O" K4 ^, v; K2 c
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