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|  DSH 592/06
$ ^- a5 h+ K/ z7 R/ Q1 N! u; @4 c$ R, {# ?4 e2 E
| Dust test for IP 5X and 6X as described in the transformer standard/ W& w4 f/ y2 K$ @7 J" M
| 17.1.1C, 13.42 J) ^4 R" i2 |0 ^ E. K7 `
| 61558-1(ed.1);am1 & 60529(ed.2);am1- C" t e( q) ?2 F! N
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5 f% f/ S& @2 H' D4 ?+ gStandard: IEC 61558-1/1997
1 M/ [- s6 l+ B, s! mA1/1998. V+ i3 p% h6 q7 \3 A& m3 G# N3 j& A
IEC 60529/1989
; s/ b, S, \" jA1/1999
- }6 I/ n2 M Z( ^0 MSub clause: 17.1.1C- Q, O0 R2 }3 F. `1 ~
13.4* k. l' x" G9 d1 K0 E( ]/ S
Sheet N°: 592/06
! K7 h* \- X) L# G2 C9 s6 OPage: 1(1)
' G, E1 D+ ?$ g( m7 ASubject: Dust test for IP 5X and
# s/ a/ d( d H1 Z) K" `/ G4 \6X as described in the) b2 L4 m. v% Q$ g7 a9 @
transformer standard
1 U% t; }# c- tKey words:
. W: a& \2 x( h1 h$ Y& d- Transformers3 b9 I- F% t( p5 E
- Dust test% i. ]8 H n4 y2 x) t& n$ g
- IEC 60529: Q' b" c- F# F& a* L% G7 a
Meeting:1 n1 V6 J, S" g3 e) ]
Decision confirmed" a: x" r5 o0 `4 P+ Q# Z
at CTL 42nd meeting; y2 F+ { m2 K2 e2 \
Question: In the horizontal safety function standard for degree of protection provided by1 M5 m0 Z4 S# c" w0 U" R0 p: Q! C
enclosures (IP code), IEC 60529, a description of the dust is given in subclause
( J' x) _' l& N' F2 `13.4. However, in the transformer standard the description of the dust divagate a
8 X) a& t/ K! `bit as the following wording is added: “and shall have a range of particle size- Z: U/ |1 I# C% h% H
down to and including 1 +m with at least 50% by weight less than 5 +m”. This& Z, {/ J: M& A, b; u2 K
more precise description imply that dust in the dust chamber must be changed( q+ H/ T$ X. b3 u
when a transformer is tested, this without any technical reasons. For the future,
( g; S5 g1 J" `( o' _% tcan we use the dust specified in IEC 60529 also for transformers?& s4 M# p1 E' ]+ d. ]1 {$ m/ [
Decision: The horizontal safety function standard IEC 60529 shall be followed, i.e. the dust
: m! w6 W" U* B# Gspecified in subclause 13.4 can be used.
% R8 L% ^$ J6 w7 d: K, w' H* N! `) O& B/ j" d* v
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