DSH 591/06 Short circuit and overload protection

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DSH 591/06 : c6 z: x" r, `( |$ n3 w8 I 8 H. ~! K- I! T# d

Short circuit and overload protection

15.3.2

61558-1(ed.1);am1

Standard: IEC 61558-1/1997
. z0 I1 W( H7 u3 W0 f. S2 tA1/1998
+ H% R. R! y' }9 Q. ]# g, kSub clause: 15.3.2
Sheet N°: 591/06
Page: 1 (1)
" [" g7 [0 l* g3 U2 cSubject: Short circuit and overload
! B/ J8 R2 q% P7 [8 _protection
: P# o& c8 f0 m' i; t# LKey words:
) u6 V' w5 e( c" J- Fuse current
! m: N# `4 m( [, ^0 V' t  A- Overloading test
- Overload current
7 K& D2 C. t% ]' k( C' ]' m5 HMeeting:
. B6 M- Z* _, w0 R3 HDecision confirmed
) U- G3 y3 @5 o3 S& b. r- Mat 44th CTL meeting
# I$ g2 F, ^6 `) CQuestion: During the overloading test on the transformer according to § 15.3.2 the
) h  L; \  f2 N: D7 i3 i  ]* j4 c. `temperature of the windings and their resistance increase and consequently the
9 W$ T) g( X$ T" H* r4 Eoverload current decreases. Has the fuse current be readjusted to the original
; P3 x0 M  E: o) A. X+ Aoverload current during the test or no adjustment has to be made?
1 }2 p5 N  F6 c$ vDecision: The fuse current has to be kept constant during the test.

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