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|  DSH 591/06
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+ _2 r2 w% H( _8 A3 M | Short circuit and overload protection
Q8 P; H' M S, R; s6 o | 15.3.2; j! n5 x \7 ~! f; R4 u, A
| 61558-1(ed.1);am1
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Standard: IEC 61558-1/1997
# ]- E: n. z0 o2 dA1/19984 J) U& C( _- z4 [# \. }5 D$ E
Sub clause: 15.3.2
) M9 O9 H$ m* o; ~Sheet N°: 591/06" ^/ p4 Y* t8 D& Q: H) ]) E+ ~
Page: 1 (1)" g y2 G/ ^2 U) A1 ]
Subject: Short circuit and overload5 E/ j5 C2 `& q1 n6 L/ p9 k
protection& C6 p5 {. F2 L
Key words:
& s* `9 n& B% U" T5 M n( r6 M- Fuse current
* S1 {" W2 s3 N. \2 x- Overloading test' p3 ]! u4 H5 ]3 W% e e c v
- Overload current
! s* g- G4 b4 h ?Meeting:- n& |5 h: J! Y2 y
Decision confirmed, o+ ]! Y, t) b; h0 ~8 z6 l; k" j
at 44th CTL meeting! A1 B" r7 Y; `" x j4 j
Question: During the overloading test on the transformer according to § 15.3.2 the
6 j S9 k2 P% ltemperature of the windings and their resistance increase and consequently the7 F% v: D( Y }9 {
overload current decreases. Has the fuse current be readjusted to the original9 Z, N0 c I1 q* @! V% U
overload current during the test or no adjustment has to be made?
) l- O/ e$ d: H% r& G5 x5 f7 l4 J8 yDecision: The fuse current has to be kept constant during the test.# l5 \' z) B9 [# ^4 d
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发表于 2012-11-8 15:07
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