PDSH 1022 Short circuit and overload protection

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PDSH 1022 6 M  K( c7 J7 v! d) y 3 T) M2 z# o% h0 S  V( {& i: F

Short circuit and overload protection

15.3.2

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

! x/ i2 y: k6 p7 D6 Y8 EStandard(s):
. @4 I  O: v1 a0 ~; O6 r. gIEC 61558-1
+ F0 {0 r$ b) MAll editions
! }  k7 I) j* F9 A# J* s$ g# x5 p6 lSubclause(s):
15.3.2
No. Year
% z# L/ N1 V0 a) yPDSH
* t5 O) Y- P4 z8 x2 T* c- v1022 2010
Category: SAFE Developed by: ETF5
( |/ R$ `7 l3 x. cOSM/LUM
2 j) C$ F  W1 {8 u2 n; V4 USubject:
Short circuit and overload
protection
Key words:
6 \) j6 R9 t7 ?- Fuse current
! `& J7 K' o  ?- Overloading test
) i- v7 V( i2 n" e+ x- Overload current
To be approved at the 49th
4 N" J/ I3 t3 D8 _. R$ ~5 mCTL Plenary Meeting, in 2012
Question:
During the overloading test on the transformer according to § 15.3.2 the temperature of the windings and
  i! U( @# i0 v/ ]+ F8 ~their resistance increase and consequently the overload current decreases. Has the fuse current be
* S8 ]5 H& I4 K+ Rreadjusted to the original overload current during the test or no adjustment has to be made?
Decision:
The fuse current has to be kept constant during the test.
3 [7 p$ H: ^0 n7 {