PDSH 1022 Short circuit and overload protection

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PDSH 1022 6 `) Z& u5 z) S4 b ' R0 {- [: {3 K# j" J

Short circuit and overload protection ( v" V8 X) Y* L$ H$ ?, i

15.3.2 * y5 Z# l/ R# V% N# R

61558-1(ed.1);am1 & 61558-1(ed.2);am1

4 B9 J' o& Q3 u: h; FStandard(s):
4 f: \$ N+ R! j. wIEC 61558-1
All editions
Subclause(s):
  K$ q+ x, K, k! ~; H15.3.2
# t7 w' |) _* G& L+ y! Z" LNo. Year
PDSH
1022 2010
6 ~1 T2 \% v4 \7 E: o, i& J8 ~Category: SAFE Developed by: ETF5
OSM/LUM
Subject:
Short circuit and overload
protection
Key words:
2 C1 K( t3 p$ l  h4 l3 Z# ~0 {- Fuse current
% ?+ I3 f. G- i. l& r: P- Overloading test
, |8 V/ I. q) g- Overload current
: r. z, Z! e5 e5 k( o' @5 v; yTo be approved at the 49th
1 E* @. ~& l6 k! n. oCTL Plenary Meeting, in 2012
  |$ v; Z& L) ?; v3 t0 D# ]Question:
During the overloading test on the transformer according to § 15.3.2 the temperature of the windings and
1 S6 ?9 C+ T% ?  ^their resistance increase and consequently the overload current decreases. Has the fuse current be
readjusted to the original overload current during the test or no adjustment has to be made?
- a- h4 ]9 R2 |7 f; N4 q! zDecision:
The fuse current has to be kept constant during the test.
/ U8 I2 I1 [$ f/ s  j9 B8 h7 D