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|  DSH 589/06* u& O' k3 v5 q3 ?. S6 W
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| Heat and fire protection
* [4 Q" g6 \/ s* s5 D8 X | 3.1.9.1, 3.1.11, 15.3, 15.5, 27.3
3 b' G, k* V& [) J* b& r0 G# d0 T8 x | 61558-1(ed.1);am1
) E5 [/ H+ P- t. h! e |
: ^% @% w1 @. ?Standard: IEC 61558-1/1997+ b2 M4 o7 A6 q. z' F
A1/19989 d. {( Y2 d- I+ x2 c' b% W7 m
Sub clause: 3.1.9.11 Z5 y. } r# k* @. E( P
3.1.11. E+ v( f, I, J! o: _& L9 {3 p
15.3 – 15.5 – 27.33 \( M/ O+ q4 c U! S8 w0 A$ S
Sheet N°: 589/06
% L( ^4 E7 a, s) C2 ^- APage: 1 (1)
3 J% z" b! }* j% vSubject: Heat and fire protection' w. m: [! |9 j- ]6 |* v
Key words:- N" R$ A& O# R. G; s
- Non-inherently short
7 J o' ~! Z, u4 B+ Ucircuit, e' p/ ~2 e) Q! i& g* g' f
- Proof transformer
& a Z1 S- X/ f( [: W3 k- Fail-safe transform.
- A2 a- r" e& H% }! m/ PMeeting:
+ U% Z d3 \8 n1 V* }7 @2 [5 eDecision confirmed
; h( E( F' O+ k7 _; k Mat 44th CTL meeting
9 V5 p8 j% H. G/ zQuestion: Can a small built-in transformer with integrated thermal cut-out (not
2 U9 T; Q9 V- j( {1 I" I: xreplaceable) be considered as non-inherently short circuit proof transformer4 {+ D: c6 `! e0 Q s1 ~& P+ m7 T
(3.1.9.1) and as fail-safe transformer (3.1.11)? If so, can the overload test be
5 ?# _2 }; Z' m9 `6 r0 C- B/ [done according to 15.3 and 15.5? Both tests are to be performed on separate: h8 {! V0 B8 ], H
models.: B# Q: N; Y, u; f
Decision: Yes, such transformers can be considered as fail-safe transformers if a thermal
9 T" o/ G+ C( f) q, c" [6 `3 z0 plink is used in the input circuit. It doesn’t matter whether the input circuit is8 l$ v8 ~4 m0 {5 `, g7 D5 ~# t
interrupted by the transformer itself or by a built-in thermal link that is not
" L$ c# g3 X$ K+ p" ?) T* Jreplaceable.
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) u. d% O H0 y0 e5 g# j- N: f" G6 N7 `5 ]0 F. o
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