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|  DSH 589/06
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| Heat and fire protection
/ X. V: [7 x: W1 _8 X | 3.1.9.1, 3.1.11, 15.3, 15.5, 27.33 C3 o; b0 [% U* b- ~" u4 v6 g( ]
| 61558-1(ed.1);am17 S& T. [. q D: U, A9 }2 _# j1 R
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Standard: IEC 61558-1/1997
! x( T+ N/ w0 g7 U/ eA1/1998! c* ~+ }% H! |" D* ^4 N
Sub clause: 3.1.9.1
8 {- H& j4 A1 B9 C: f/ d3.1.118 L N$ U1 y7 s3 D
15.3 – 15.5 – 27.3
1 g+ |: ~. p7 O& ySheet N°: 589/06
6 u- e" ?. D/ `" G! o5 EPage: 1 (1)0 t9 ]2 R6 ]5 O4 ]6 y& { T' Y' k
Subject: Heat and fire protection
0 b/ d# k/ d$ i5 o1 x) lKey words:
3 N6 v% ^6 l& s: k& f- k# ~$ {8 {- Non-inherently short
2 M0 f$ o4 Y! N xcircuit5 L7 Z: G, o& q7 q: T
- Proof transformer% o4 B; P) _; Z: C( C
- Fail-safe transform.0 u* m& e8 \& M; ^6 s
Meeting:
8 n9 H9 c, `7 h9 b% f9 d GDecision confirmed
2 I, N( W8 S: o" @+ sat 44th CTL meeting
, T8 G: Q$ M$ p, C# ~Question: Can a small built-in transformer with integrated thermal cut-out (not
$ D4 d: r0 L/ U" q* dreplaceable) be considered as non-inherently short circuit proof transformer
# V2 t) P$ l" o4 ]7 A% ^(3.1.9.1) and as fail-safe transformer (3.1.11)? If so, can the overload test be; i6 D* l& n# K+ m8 o
done according to 15.3 and 15.5? Both tests are to be performed on separate
5 W, @: T* b; U# [- Rmodels.. j0 ? \) V; Y
Decision: Yes, such transformers can be considered as fail-safe transformers if a thermal6 K7 t9 ?+ ?; Z) G& O: E2 j
link is used in the input circuit. It doesn’t matter whether the input circuit is
* F( S+ ~2 G* c* g$ x9 x7 winterrupted by the transformer itself or by a built-in thermal link that is not
( q& X, e3 w5 U: Z8 l. Freplaceable.
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发表于 2012-11-8 15:11
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