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|  DSH 589/06. X% z, O3 S0 d& D+ B
& ^. o1 s9 c5 Z: M, [ | Heat and fire protection! C0 }7 o/ o, Y d6 m' t
| 3.1.9.1, 3.1.11, 15.3, 15.5, 27.31 A' [ a0 G; l6 L+ N7 W0 {& w
| 61558-1(ed.1);am1
$ ~5 x( I, g E7 @ |
5 l1 V5 \* n5 cStandard: IEC 61558-1/1997* Y/ j. k1 O0 l0 P; H* t8 J
A1/1998
6 L1 A/ n4 }: _8 Z2 _3 ?4 bSub clause: 3.1.9.1' D& }. A1 U0 u
3.1.11, }# Q' c. a _; M0 Q
15.3 – 15.5 – 27.36 h) y( ~9 t; s2 @, D7 v( m
Sheet N°: 589/066 X2 H" s" [, J, }) ]" p( p
Page: 1 (1) r# H" y& S2 ?6 E. A2 O) V( k1 O
Subject: Heat and fire protection
3 J* v n3 J& V7 }7 A* C9 u9 cKey words:
/ A! I9 v7 `+ i3 @3 e C. j9 B+ ]- Non-inherently short
% m) s4 d) m* W3 R: G" |/ wcircuit
9 K# L6 B1 N( J- P- Proof transformer
# Y, W1 D) \6 I2 D7 @- Fail-safe transform.- S0 S% \; v6 h8 Q) s2 w
Meeting:+ ^0 a' H1 |6 J( e
Decision confirmed3 {) e7 ?# \5 z$ [! Q( ?
at 44th CTL meeting, a3 v6 l4 ~) h9 m1 k1 A
Question: Can a small built-in transformer with integrated thermal cut-out (not
) s7 s7 v% ^+ M. c% \) mreplaceable) be considered as non-inherently short circuit proof transformer
8 Z+ C" j/ l- B+ k1 ~(3.1.9.1) and as fail-safe transformer (3.1.11)? If so, can the overload test be. f6 Y9 }1 r) V. R" }
done according to 15.3 and 15.5? Both tests are to be performed on separate
$ q: ?- ^# S1 s6 Qmodels.
+ u. k2 b& Z- B3 E6 f2 kDecision: Yes, such transformers can be considered as fail-safe transformers if a thermal
9 Q, {9 k% J0 F) |9 M: hlink is used in the input circuit. It doesn’t matter whether the input circuit is
# X0 B: s9 |, E7 Ainterrupted by the transformer itself or by a built-in thermal link that is not
6 c2 N' F# S, Z% `replaceable.
2 |3 r8 ^" J2 L' R6 @- p7 V: h
- ^- |& f# _0 j0 Y" T! [. V+ x
. W8 E* W) Q5 Y3 [! W5 z: l( q7 D
; M( o3 S7 S8 x6 `$ p% g" D# C
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