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|  PDSH 1022
. @+ { v: o& w" v- t2 V% k" o% H, Y. k3 w1 c* D0 u
| Short circuit and overload protection
' i; _, e% C& U% _ | 15.3.2
: b% L' Z, a8 m# n! ]5 W* H1 X | 61558-1(ed.1);am1 & 61558-1(ed.2);am1 M" u% o" F, r' k$ W) H
|
* h' [) v6 C% qStandard(s):) v1 z9 X! @7 f# e+ Q8 N& ^
IEC 61558-1
0 R5 n3 S% u5 H7 z# |4 j! `All editions
& n9 O* w: M7 qSubclause(s):
% R; q# E( @% l2 c/ N15.3.2
0 O% O+ s+ a( c, ANo. Year! I9 M1 J( n' b: q
PDSH# V. D; B0 s; ^0 C5 I) G0 C
1022 2010. x% f1 q: \" U1 }
Category: SAFE Developed by: ETF5; Q3 l2 A8 U4 {+ \' L5 D( C
OSM/LUM
; A6 N( b1 O; u6 G% y. j: T; I5 v& NSubject:
/ S* j; R- }( d+ b6 a5 aShort circuit and overload
# F( \4 m5 u& y* k s2 t: w% E4 f. n6 ]protection
% B3 N8 p7 M' ]4 OKey words:% ~. n" }+ i) |5 j5 g4 R
- Fuse current
+ {& J2 o2 X2 [# B- Overloading test* N; |; B! X" p* g) P1 v# d+ |
- Overload current4 U ]$ G! O( S: b3 L
To be approved at the 49th0 U. ^ }7 p2 q# I$ E
CTL Plenary Meeting, in 2012
4 u2 |. r, |) a9 QQuestion:: S) |1 e' c x( g5 x& C& T
During the overloading test on the transformer according to § 15.3.2 the temperature of the windings and
a2 ]* ?6 m+ K( K8 \, V$ rtheir resistance increase and consequently the overload current decreases. Has the fuse current be
! f+ u: u* V5 t& g& M* Lreadjusted to the original overload current during the test or no adjustment has to be made?: n8 d# S+ I5 ^4 ]. T( j5 U
Decision:
* I7 _ K9 s. ~) n; J. T# e# `4 |# _+ I# B+ VThe fuse current has to be kept constant during the test.0 ]/ k2 Z$ P b) w
0 l3 f: u, J* k9 O K5 l0 T/ ]$ `: Z |
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发表于 2012-11-8 15:15
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