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|  DSH 591/06
+ h- h" ?- r1 a* |' K4 [
, Z% u+ K7 S9 a: U | Short circuit and overload protection8 `( Y) D0 l- v+ s% X7 Y
| 15.3.2( d! a9 ^% f) \& w# y
| 61558-1(ed.1);am1# D! ?' ?: j# D' Y
|
9 R. ?6 {" G6 ^# L3 v$ R5 @
Standard: IEC 61558-1/1997
' Y1 d( m: b+ ~" A4 Y7 R5 s- dA1/19986 m8 J! l3 o2 R1 T, E2 t/ V! P- \
Sub clause: 15.3.2
' Z$ R- U# I& |' f. ^Sheet N°: 591/06
9 l1 w4 W l$ _7 W- iPage: 1 (1)6 b# j! F% N4 {# T! J) G# O
Subject: Short circuit and overload
) l2 L$ L/ ]% Z4 s0 g* z+ @protection( w; R6 l" i& m4 ]/ k* W
Key words:- V- H" ~7 w2 ~6 ]* a5 i
- Fuse current
) j3 t$ c- L2 x3 V8 y6 B, x- Overloading test
! M) p& t) s5 e, |& O2 I ^- Overload current
! O) B! A8 X5 p) l) {: P) UMeeting:* H9 U" J4 x, c# T
Decision confirmed4 D+ x. ]. Q) ^; J7 x
at 44th CTL meeting
2 T' `; `+ E* g4 @. M( t5 U4 W# hQuestion: During the overloading test on the transformer according to § 15.3.2 the9 _9 b3 ]1 T( q* X l4 w( H+ Q/ {
temperature of the windings and their resistance increase and consequently the
" ?, A5 R' h$ ]/ noverload current decreases. Has the fuse current be readjusted to the original
) v Q& b/ N/ M2 U& X8 S2 Eoverload current during the test or no adjustment has to be made?
2 g! j9 K. Q, m& @0 s: hDecision: The fuse current has to be kept constant during the test.
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