|
|
|  DSH 589/06
8 Z) l1 l+ n8 B7 W7 }- l
3 U% H( U- r( a( R# r | Heat and fire protection
1 h% Q" k# a/ H3 @ | 3.1.9.1, 3.1.11, 15.3, 15.5, 27.3
; k5 _9 E, l0 Q. f | 61558-1(ed.1);am1! }6 \$ x/ w' [+ a# j
|
5 w, t* _0 o5 K2 _) _2 o
Standard: IEC 61558-1/1997
) M2 ^8 J! \& K' ]- \7 kA1/1998- @$ X! z0 g T$ G- m
Sub clause: 3.1.9.1$ j, y w. f+ R
3.1.11
5 S" I4 r$ V, W9 S" G1 R15.3 – 15.5 – 27.3
( V' o1 x/ `% F0 c4 D" b4 B4 `. pSheet N°: 589/06
9 J ]$ [+ \- f! ^3 V+ i7 CPage: 1 (1) ~3 I# b( Y/ C; v/ O
Subject: Heat and fire protection9 M1 V' Z- C' G, q' |9 q, J$ ^& N
Key words:2 j% S) V2 E. |. l3 Z
- Non-inherently short" k! w" N7 i' v) { i+ r2 X) [
circuit
; p! C' I2 s6 h$ g. r- Proof transformer
- s. k) \' L5 C; ]9 L* w; J% y- Fail-safe transform.
7 ^( x# T, G; B9 x1 s. a# V0 ]2 qMeeting:
3 y& v* {6 G7 B2 L9 @: C4 jDecision confirmed( l1 {6 ^% i1 o. D3 `
at 44th CTL meeting6 _8 i: U7 ?0 x0 e9 {) _; ]6 p! q
Question: Can a small built-in transformer with integrated thermal cut-out (not
/ \( u% z" F6 B0 j2 }( ]replaceable) be considered as non-inherently short circuit proof transformer
& d3 {' e4 F: s. t' I2 `0 k(3.1.9.1) and as fail-safe transformer (3.1.11)? If so, can the overload test be+ D- B8 d1 ]3 i% M$ T
done according to 15.3 and 15.5? Both tests are to be performed on separate# C8 m( m$ k; ]" y4 i6 W }
models.% o% i1 H0 r i, r
Decision: Yes, such transformers can be considered as fail-safe transformers if a thermal4 s7 t2 ?3 b6 y5 H# g8 L4 x% t T
link is used in the input circuit. It doesn’t matter whether the input circuit is
+ [) l& R. h# u4 A& |; s/ iinterrupted by the transformer itself or by a built-in thermal link that is not
- X9 T: y2 R- ~1 f2 `replaceable.& y8 ]* w- f4 _
/ Y3 e6 r+ t. y S: m, p! e/ N1 {# \. A/ G
! I' `! K2 o4 Y1 ^
3 J1 Y |* W5 N% a, V- L
|
本帖子中包含更多资源
您需要 登录 才可以下载或查看，没有帐号？注册安规
x
|
/2 
|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
收藏
分享
好帖
鸡蛋
提升卡
置顶卡
沉默卡
喧嚣卡
变色卡
抢沙发
千斤顶
显身卡