PDSH 1022 Short circuit and overload protection

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PDSH 1022

Short circuit and overload protection

15.3.2 , r1 w4 Y2 g# S% K( E& H7 d# @2 W

61558-1(ed.1);am1 & 61558-1(ed.2);am1 2 X) \9 S4 @$ T: q" Q! d7 _

Standard(s):
) E: E6 N2 D; q' u3 m1 LIEC 61558-1
0 D" I; g0 b; QAll editions
Subclause(s):
15.3.2
No. Year
( p$ W" \" m8 d$ p: a! e- @8 aPDSH
& p6 V* r4 \" Q: e4 i9 ?1022 2010
Category: SAFE Developed by: ETF5
OSM/LUM
% g; |8 }7 p6 W+ Y& _' {9 \) fSubject:
Short circuit and overload
protection
Key words:
- Fuse current
- Overloading test
2 ~& |  y' X5 K  `1 b- Overload current
To be approved at the 49th
CTL Plenary Meeting, in 2012
Question:
During the overloading test on the transformer according to § 15.3.2 the temperature of the windings and
' L% y0 V! }2 N$ o3 v9 X! wtheir resistance increase and consequently the overload current decreases. Has the fuse current be
$ W+ g' u- @" o8 a; M4 y2 P' sreadjusted to the original overload current during the test or no adjustment has to be made?
( X% t. v/ q+ W- c% b; \4 g$ [Decision:
- \' n) U7 B2 z6 {$ W8 \The fuse current has to be kept constant during the test.
. ^# `# _0 K( ^; @
4 [0 e3 e7 n1 H5 E$ y7 K