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|
|  PDSH 1022
4 E% d& Z) ]/ ~- I% h9 ~, C( B$ ^) T8 O' o. w6 x
| Short circuit and overload protection
p3 }3 G2 e4 M2 f" l# @ | 15.3.2
, ~1 K7 z7 C3 V. \" S' ? | 61558-1(ed.1);am1 & 61558-1(ed.2);am1% l3 W6 P- q, \. {
|
& ^7 P! [, h# R: BStandard(s):
+ N$ u. A* c$ e8 F, z. X8 s6 eIEC 61558-1) f3 f# k6 D/ t* b3 A; z" X
All editions
' n: }4 n, A* ? r5 j: QSubclause(s):$ w: c* }. e, x' L I5 `2 V
15.3.2
+ \: D1 O0 ?( G3 wNo. Year
$ \& U$ D" x/ K* ]- G/ JPDSH
" F- i H! Z3 `0 o1022 20104 Q+ U# D( _8 P) o M# k. T$ {
Category: SAFE Developed by: ETF50 j% \8 q H" W L! X' t
OSM/LUM- \ g+ Y& T; F9 t
Subject:
4 l/ g2 j. M+ f/ R7 U3 z; lShort circuit and overload, K7 B8 c Z3 y- e+ E- A
protection
1 l8 |2 ^+ {4 p, }% t2 x1 JKey words:
% P1 i! V* Q6 G) x* x- Fuse current, u9 Q1 t, R& h6 ]
- Overloading test) _) o' z6 y( ]5 Y8 a
- Overload current/ n0 m' l) F/ _: R5 \
To be approved at the 49th, Z8 z6 i5 G% Y: I1 l& ~/ D& l
CTL Plenary Meeting, in 2012# I0 s: |! x0 v7 ?; p, A- A. n/ m
Question:
/ a$ L5 H+ p/ W9 X V1 ]During the overloading test on the transformer according to § 15.3.2 the temperature of the windings and4 D$ W" t- G5 b; s! {' J
their resistance increase and consequently the overload current decreases. Has the fuse current be
$ k4 l" c4 p; [readjusted to the original overload current during the test or no adjustment has to be made?" Y+ @; \! |) M- I3 J2 q
Decision:. }3 C2 P7 G& T. U, `& W/ M8 b
The fuse current has to be kept constant during the test.
6 w; d: r: M. Y& _3 _0 H6 s2 }. E P2 d7 {/ P* l
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发表于 2012-11-8 15:15
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