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

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PDSH 1023 # i( o  ?# s' W3 x # n9 O5 j! U- `$ S  ]

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

17.1.1C, 13.4 1 a+ q$ U' L6 A' s% Y

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

Standard(s):
IEC 61558-1
: R8 U* e, V; RIEC 60529
All editions
4 f  T& x2 v" f, `Subclause(s):
17.1.1C
13.4
' ~' \, w2 R; t9 f2 {4 kNo. Year
# X6 V, H1 o* I/ QPDSH
% u; N6 I1 x: Y, y* c* \, V1023 2010
Category: SAFE Developed by: ETF5
' G: s# G2 D  W) i; v& UOSM/LUM
Subject:
8 Y& T* |4 E; e* N. ?2 M! sDust test for IP 5X and 6X as
+ T; W3 O9 _( e9 J( o# fdescribed in the transformer
. ~/ e/ |! f6 x6 e6 c& Bstandard
- M/ i0 y" d# |! T! v5 v2 JKey words:
8 [' e) t# w; X$ R1 j- Transformers
( v+ A9 }0 [, ?* o# h5 j- Dust test
- IEC 60529
To be approved at the 49th
CTL Plenary Meeting, in 2012
Question:
# v! l5 a6 F% I0 r! lIn 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
/ \8 r& j0 y1 M7 P7 q8 e; xdescription of the dust divagate a bit as the following wording is added: “and shall have a range of particle
$ B! M6 F& x$ g" E: t1 U. csize down to and including 1 μm with at least 50% by weight less than 5 μm”. This more precise
1 b9 [4 G1 G3 F* R# c0 i6 xdescription 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?
- C8 _: W# d2 z1 r- c7 FDecision:
& W9 ?: h% L% o- m4 ^2 A* dThe horizontal safety function standard IEC 60529 shall be followed, i.e. the dust specified in subclause
/ `* u" e+ }  {' T3 U13.4 can be used.

  {- ^& T6 u5 s1 Y9 W; C! m
1 Q! T* Y- q  V0 b/ H