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[POW] DSH 1033 Separation of welded contacts after short-circuit test

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发表于 2012-11-7 18:34 | 只看该作者 回帖奖励 |倒序浏览 |阅读模式
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DSH 1033
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Separation of welded contacts after short-circuit test 9 o: Z/ j7 G& ^2 U' @
9.3.4.2.3.j (60947-4-1) 8.3.2.1 (60947-1) ( _0 @- L# Q4 b
60947-1(ed.5) & 60947-4-1(ed.3)  L6 H5 P2 [& O) I. }! k. h: {4 W
0 k3 E4 i& y4 d, Z
CTL Decision Sheet - DSH 1033
* L+ s$ V/ J) z! k9 f(replaces PDSH 1033 on 2012-10-22 by CTL Chairman decision,
8 m) G- o4 p6 b8 J" ?* Uwill be kept remaining until final decision by 50th CTL Plenary Meeting)2 ^! G8 O6 }7 K0 o5 B; ]
SC 17B/Publication IEC 60947-4-1 Edition 3.0 2009-09
# J& W5 [' C0 ~6 n) @! j0 U* LLow-voltage switchgear and controlgear –
2 f6 C/ q! G, ^1 j# ?4 F2 [  pPart 4-1: Contactors and motor-starters – Electromechanical contactors and
! ^) |, ~4 z6 D( vmotor-starters
- `& `. x  O, X- V# P4 b9 m0 {INTERPRETATION SHEET
" \# L$ g/ A7 B( LThis interpretation sheet has been prepared by IEC SC17B/WG2 on 2012-09-06
, Z6 |/ g1 g0 n9 p! mThe text of this interpretation sheet is based on the following documents:
3 |+ s  u  w  m' ]+ GIEC 60947-4-1 ed 3: 2009! {3 H' E, k  U8 N1 ^/ F- o5 C
___________, r! A1 g% y: e( r7 |' D
Interpretation! g$ v* X, u: i4 z7 Y$ j' k0 x
In Clause:
7 a7 L  v' g  X, ]6 c2 @- R9.3.4.2.3 Results to be obtained) Q/ i2 B8 x- f+ u. {# Y! n
The contactor, starter, or the combination starter, the combination switching device, the
8 h, z3 @- Y8 B7 ^protected starter or the protected switching device, shall be considered to have passed the
: b4 r" ?$ v) V" _tests at the prospective current "r" and, where applicable, the prospective current Iq, if the
  q- X. ?- K8 S, Z; V5 G5 |following conditions are met for the claimed type of co-ordination.
) q: U& Z: P' j# u2 A1 ?" r! Z  ZType "2" co-ordination (all devices):: Q$ A& c0 S% c" t8 Y, [* X
J No damage to the overload relay or other parts has occurred, except that welding of; v; z3 q) Z% O/ B9 j1 d1 l6 Y
contactor or starter contacts is permitted, if they are easily separated (e.g. by a6 E1 ?6 x$ M! L0 l. u" z5 o
screwdriver) without significant deformation, but no replacement of parts is permitted* V( T2 n3 W7 p& Z! h8 p
during the test, except that, in the case of fuse protection, all fuse-links shall be replaced.
6 ^2 B* q4 U! \- R  ?& t1 M# ^8 O) [# AIn the case of welded contacts as described above, the functionality of the device shall: p3 f& |( I% y- O* i  k8 y6 [
be verified by carrying out 10 operating cycles under the conditions of Table 8 for the
' @- E. l1 M# X7 B9 L7 h  S7 a! aapplicable utilization category.
$ |3 n4 w6 F* y9 S" g& ^5 CThe text "if they are easily separated (e.g. by a screwdriver) without significant deformation"/ Q, K# F$ k! t2 W
shall be interpreted as follows:2 n1 F; u( e6 y4 g4 m
"Easily separated" means a separation realised on site for example by:) |( v% `9 X) \( u. U
- Energizing the coil of the contactor
% x' R& p: o1 D$ s- Using a tool (eg. a screwdriver) for separating the welded contact or for moving an operating5 u& I+ }8 g% j% s8 s, c! a
means.' s$ ^0 I; u, |
It is also allowed to remove covers or housing of the contactor according to the instruction of$ Y$ B5 S, D' h/ P. k8 \: x
the manufacturer.: ?: p/ R. ~+ t+ m. B
"Without significant deformation" means a deformation without impairing the insulation of the
/ c$ ]* V. Y3 qcontactor (see d) and i) of this Clause) and successfully performing the 10 operation cycle
0 f6 e2 I9 H9 a, w, gspecified in the last paragraph of J.
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1 Y3 i' H6 N. k8 `$ q, c5 O

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