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|  DSH 589/06
% o$ l* l$ O! J+ z! M$ Z# T4 ~8 d. ]; T+ L2 l3 Z/ l5 c; @
| Heat and fire protection, \7 E+ R8 p h$ _; C- r9 V
| 3.1.9.1, 3.1.11, 15.3, 15.5, 27.3
1 G$ `8 l* \! E0 L3 U | 61558-1(ed.1);am18 {1 S$ ]; _% L* s
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2 ]" z" L/ |4 f. P9 wStandard: IEC 61558-1/19977 ]" A7 _( p3 M6 i. ]$ A% |% f
A1/1998& O9 Y8 s0 c4 g) Q5 r) r: r. @2 d
Sub clause: 3.1.9.1
" c( X& j k4 [& Z- f' K) t3.1.11
% B: w9 l( ~9 x/ m15.3 – 15.5 – 27.3
1 R% {) b3 p( k4 ISheet N°: 589/06
+ R8 s- U. d8 K' o: e2 SPage: 1 (1)
& F1 ?4 z' v- p* v% ?Subject: Heat and fire protection. b( X9 c' |: y
Key words:
B! n7 r8 ~& S* j& }% |- Non-inherently short& j" d$ U, d' T) o
circuit6 k) N4 t4 A. t; i7 o
- Proof transformer" ~0 I! T& }4 ~4 p! J9 Q% b. ^4 A
- Fail-safe transform.% A! I$ v+ j- D
Meeting:
1 n' t3 }( E* h5 ]5 _Decision confirmed
2 ?. x5 @) A) h2 P- ^1 q9 |0 _; Yat 44th CTL meeting
4 C# J% k2 Z& Y2 JQuestion: Can a small built-in transformer with integrated thermal cut-out (not
9 N7 Q: |; M* Q9 Z' }! Freplaceable) be considered as non-inherently short circuit proof transformer3 h8 J9 U7 R8 P3 Q
(3.1.9.1) and as fail-safe transformer (3.1.11)? If so, can the overload test be
0 x+ v* \5 M% ~, h! R% _done according to 15.3 and 15.5? Both tests are to be performed on separate$ {: e: e6 G6 c9 t" \3 v, l" U
models.2 Y" F/ W1 o0 E
Decision: Yes, such transformers can be considered as fail-safe transformers if a thermal
& I3 ~' X8 T$ j0 T: r2 nlink is used in the input circuit. It doesn’t matter whether the input circuit is
, O% L8 C7 a. p6 }& ]interrupted by the transformer itself or by a built-in thermal link that is not
! N. z) N6 q% |# [* g" x% Jreplaceable.
& E% @8 S0 {) R7 S9 `' Y0 s5 t; I1 I: T) x- ~& X8 \
! D' ]8 v3 r9 n" {6 Z; c3 [3 ]' @$ k: q3 o9 E+ i
; k3 S8 S% P l7 H1 w; i, g |
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发表于 2012-11-8 15:11
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