DSH 591/06 Short circuit and overload protection

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DSH 591/06 2 o- }+ ?1 j1 h. a. U0 A# C+ Q1 T : F2 _$ ?1 _8 g9 S6 n& R& G

Short circuit and overload protection

15.3.2

61558-1(ed.1);am1

Standard: IEC 61558-1/1997
A1/1998
) Y4 ]  P: _0 g5 K) I% USub clause: 15.3.2
* T' f, y' o* cSheet N°: 591/06
Page: 1 (1)
Subject: Short circuit and overload
8 m1 N1 ]& [3 J# qprotection
Key words:
; Z# x) ^) \. }3 m, k- Fuse current
- Overloading test
1 ~" d: n, O* M5 [1 \- Overload current
+ L$ `1 Y. z1 |9 b# pMeeting:
! M: F7 Z9 Y1 ?$ lDecision confirmed
at 44th CTL meeting
5 [- u5 f9 D& h$ Z/ PQuestion: During the overloading test on the transformer according to § 15.3.2 the
temperature of the windings and 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?
% g1 D8 X6 m% I& ^Decision: The fuse current has to be kept constant during the test.