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|  DSH 589/060 g5 k' c6 z, c$ Y9 y, I
8 S/ H* J: W5 Y$ s | Heat and fire protection6 X4 W- a# m3 U: x) ?6 y: m6 \
| 3.1.9.1, 3.1.11, 15.3, 15.5, 27.3
( Z8 e Y" j( S2 p | 61558-1(ed.1);am1
. |+ h/ ]) `2 E I/ h5 V( q |
3 A3 ]5 f6 }$ X4 n: YStandard: IEC 61558-1/1997
, V% g& o/ _. F3 X) s9 EA1/1998
. ~( V( w- }1 ]) qSub clause: 3.1.9.1
; t. j* B' M$ Y3.1.11
% ?) M" Z7 V- y7 K' {7 ^15.3 – 15.5 – 27.3- [- E! Y* z& n! R
Sheet N°: 589/068 C% d4 p" @: o/ q
Page: 1 (1)+ r2 Z; p* C' o7 S8 i* _
Subject: Heat and fire protection T' \ V' K# \ V. j
Key words:- P) x7 ]5 _& D* V, {6 |& R
- Non-inherently short( l0 W0 w! u0 O5 {
circuit
, c# V& t( U) D2 W. d. ?6 t- Proof transformer0 X# G- ]3 N. v+ h+ n1 _
- Fail-safe transform.
4 B4 T8 z' ~' I* f4 g6 LMeeting:# D% l' C# \0 _4 i
Decision confirmed
6 k7 ]0 g1 U% s* C, dat 44th CTL meeting
, l4 {1 a! l. Y. b$ i7 q! WQuestion: Can a small built-in transformer with integrated thermal cut-out (not
?6 @3 x8 K) E% i& b7 vreplaceable) be considered as non-inherently short circuit proof transformer
) n5 i8 a! t" _) l% X1 u ^: U(3.1.9.1) and as fail-safe transformer (3.1.11)? If so, can the overload test be! h+ s% l7 ^! z- @
done according to 15.3 and 15.5? Both tests are to be performed on separate+ f* p( E" T; `
models.
- v U5 d! `- e2 d5 l' EDecision: Yes, such transformers can be considered as fail-safe transformers if a thermal
X. [' i& x# n3 o% c6 a7 A3 nlink is used in the input circuit. It doesn’t matter whether the input circuit is
1 p0 b' F# F! D+ |+ F+ B/ \7 q8 tinterrupted by the transformer itself or by a built-in thermal link that is not$ U* F. p' f& j
replaceable.
! [9 Q: p8 M- {3 s8 P( h1 k+ {3 ?4 S- G$ @3 a+ [! ]
. {. A% k# E7 R! i. Y! H1 m. y
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