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|  DSH 589/06; _9 j2 N& Q( p+ ~/ B( L0 M @. q8 {
- D$ P* K0 ^" J. C; U3 D/ g$ F5 k5 K
| Heat and fire protection4 K6 U" G& i" g T; B2 L* g, U
| 3.1.9.1, 3.1.11, 15.3, 15.5, 27.3
o$ r8 J9 N: j | 61558-1(ed.1);am1- n2 _. h* v6 e5 R" ~& p$ A1 l
|
- j* _7 D! s3 W6 @6 ?# j
Standard: IEC 61558-1/1997
( _) z, S- O% q1 N6 W# V) G. IA1/19983 T, s" u% P# e
Sub clause: 3.1.9.16 [8 Z) a$ D1 I4 E6 B2 R2 r; q
3.1.11
2 k# L3 O' R% }% a15.3 – 15.5 – 27.3
, |; m! B6 R" o. |0 Z6 jSheet N°: 589/063 I: B9 w( J+ }
Page: 1 (1)$ F& k' t% {- Y x0 X# X" X
Subject: Heat and fire protection
7 t7 r* w% O8 o1 F" W2 sKey words:% R9 k# u6 k7 d$ d' a! a3 j
- Non-inherently short* R- y A+ H( u' y
circuit
& U! i& m8 ^, I$ z: Q% i5 h- Proof transformer" K2 D% P. z; K# G: @
- Fail-safe transform.
0 P& R+ G' ~' C' vMeeting:
4 D. v7 F2 b1 n6 B6 z2 FDecision confirmed
& ?1 I! O& V; R5 Uat 44th CTL meeting4 \) k6 R0 x; ~ h
Question: Can a small built-in transformer with integrated thermal cut-out (not. k( [. I' b2 H5 a Z1 M
replaceable) be considered as non-inherently short circuit proof transformer0 x, f; G( m! K! V( e
(3.1.9.1) and as fail-safe transformer (3.1.11)? If so, can the overload test be+ D4 D" d/ q3 T; K4 T4 k
done according to 15.3 and 15.5? Both tests are to be performed on separate
1 q- _. s$ S* g% W& Dmodels.% a; V$ k' K, ?" u. {" ~+ p: u! ?
Decision: Yes, such transformers can be considered as fail-safe transformers if a thermal; E9 Z8 d, Q' @1 Q: ?6 B! Y
link is used in the input circuit. It doesn’t matter whether the input circuit is
5 L* q( [3 [0 s8 Cinterrupted by the transformer itself or by a built-in thermal link that is not
) A0 e' p2 T4 E% r) _replaceable.! O; Q9 [: p9 Z% O- F" i( ~' `: n
8 m" b' v; E4 u! s5 a0 Y6 j5 j7 B% l& j, B9 F$ o- U! D {
) [' {0 [ {3 i: o) B
0 }( T9 J" H) n" W1 i/ J4 n% K% e |
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发表于 2012-11-8 15:11
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