PDSH 1023 Dust test for IP 5X and 6X as described in the transformer standard

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PDSH 1023 $ B% K+ \$ ^& J

Dust test for IP 5X and 6X as described in the transformer standard 2 n2 c) Z( Q* Z3 Y$ x+ X& o3 ?0 v6 q

17.1.1C, 13.4

61558-1(ed.1);am1 & 61558-1(ed.2);am1 & 60529 all editions

Standard(s):
/ E1 m, m7 U7 ?& ?IEC 61558-1
, Y4 b5 H6 F7 A, }! N) G. vIEC 60529
" p0 A, {% s! Z! [4 y: N/ |All editions
# S& b* N$ u9 f. B0 Q8 KSubclause(s):
% ?1 ^0 g' M+ _6 ~17.1.1C
3 a  }( s( E' b( t  g( H13.4
. N% `7 S7 ?+ U2 ^2 a( oNo. Year
PDSH
* Z' Q& M* e4 J) K( p) f1023 2010
& s3 f, n- x5 T/ ~& f7 i5 L) K* SCategory: SAFE Developed by: ETF5
OSM/LUM
Subject:
' G& B8 V3 O' a% C* [' {  w# CDust test for IP 5X and 6X as
described in the transformer
' e* W2 ~! v/ h6 j2 r0 istandard
* i# \5 E; u; ^Key words:
' D0 h& F' M$ N8 Y5 b" e4 p- Transformers
' @4 {1 U( R3 ~: i- Dust test
- IEC 60529
$ M9 [  u& Z# F; f/ V  ETo be approved at the 49th
2 L5 {5 N# g7 Z2 `3 \  m6 [1 ~CTL Plenary Meeting, in 2012
Question:
2 j, v# T* G& f. I+ fIn the horizontal safety function standard for degree of protection provided by enclosures (IP code), IEC
60529, a description of the dust is given in subclause 13.4. However, in the transformer standard the
description of the dust divagate a bit as the following wording is added: “and shall have a range of particle
! X# b1 J0 @" k$ J; S+ c9 C/ Vsize down to and including 1 μm with at least 50% by weight less than 5 μm”. This more precise
2 h' q/ Z, S6 ddescription imply that dust in the dust chamber must be changed when a transformer is tested, this without
any technical reasons. For the future, can we use the dust specified in IEC 60529 also for transformers?
8 V" Q4 ^- ^( ]0 g- n" p2 |" UDecision:
9 [6 |2 A$ w2 iThe horizontal safety function standard IEC 60529 shall be followed, i.e. the dust specified in subclause
13.4 can be used.

+ y6 p! `# D/ F1 G3 B  ?