|
|
|  DSH 589/06! T/ o& g8 P+ _ e; n: m7 t4 A2 Z
' j0 Z$ X C, r9 p& h$ L
| Heat and fire protection4 @6 f9 O4 o( H8 j; q
| 3.1.9.1, 3.1.11, 15.3, 15.5, 27.31 V% q: h! V; C
| 61558-1(ed.1);am1
7 _+ S: V$ W0 L7 t* U+ Z3 f6 N |
7 [( m( C1 |% x0 z4 G+ iStandard: IEC 61558-1/1997, @8 o. y' _# o/ w3 i8 f8 R
A1/19982 B/ N5 T- l- f8 h s6 P, A
Sub clause: 3.1.9.1+ U7 J% f; E- q2 a, m# Z y& e
3.1.11
) k* ?% E9 G4 p& Y3 W15.3 – 15.5 – 27.30 U: F7 p) z8 [ I
Sheet N°: 589/060 d) l* R" O* Z( x5 N4 ]8 I
Page: 1 (1)) \$ P" A4 e- h! U
Subject: Heat and fire protection6 C0 i$ \; L8 N( U8 ]0 r, p
Key words:
9 m5 Y- c& t$ ?- c0 L1 a7 m; F- Non-inherently short
5 N9 _9 H. ]1 j( m7 F Q' @circuit* y) R, T+ k$ a5 ?7 m
- Proof transformer; e) d4 w0 y6 o7 B1 G* K
- Fail-safe transform.
2 t J; y8 i* k+ m0 mMeeting:5 l/ Y" Z5 H/ E; x. b8 \
Decision confirmed8 M0 Y- |4 `. x+ n2 ?
at 44th CTL meeting
' x) ?% w7 X, IQuestion: Can a small built-in transformer with integrated thermal cut-out (not
; g6 {! ?$ i% [3 t6 l# R' greplaceable) be considered as non-inherently short circuit proof transformer
6 u3 ^. S! Q7 y( O9 t(3.1.9.1) and as fail-safe transformer (3.1.11)? If so, can the overload test be( A3 w, n3 m! A( F9 [' q
done according to 15.3 and 15.5? Both tests are to be performed on separate
, [6 O" o' M6 ]+ W1 @4 E. s, amodels.
5 L/ X- i/ S1 S: a% u5 J$ S6 aDecision: Yes, such transformers can be considered as fail-safe transformers if a thermal
% [0 A$ Q, i6 G; ]link is used in the input circuit. It doesn’t matter whether the input circuit is
( M- _% j0 a& }: Y( x% `interrupted by the transformer itself or by a built-in thermal link that is not; U% N! x- V) q: Q. H v" f
replaceable.; m2 i. E7 r1 z/ ^6 \ ~
3 ~ I8 S7 n- l
/ D7 K( Q6 P% D
7 B& `& [; V4 ^+ J2 S. ] S) @) ]) t8 k) @4 \+ Y
|
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有账号？注册安规
x
|
/1 
|关于安规|小黑屋|安规QQ群|Archiver|手机版|安规网
( 粤ICP13023453-10 ) 
窥视卡
雷达卡
发表于 2012-11-8 15:11
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡