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|  DSH 591/06- a) D. W% {; A
$ ^2 T& U5 n+ r1 u, i. U
| Short circuit and overload protection
5 t* V1 E c' I2 {4 X8 T- w9 K: G | 15.3.2
1 ]: t( C5 J5 s; J! M2 o | 61558-1(ed.1);am1( s( n* i. F0 y% S' W0 D) n
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" R: z6 K( {8 H3 W* _# f! p+ H% G, SStandard: IEC 61558-1/1997
4 k9 [4 y" D9 @9 {8 M+ M& q' z4 K0 s' ~A1/19983 Q7 t( n1 n0 C* n% ?; A2 Z6 \) ^3 m
Sub clause: 15.3.21 w/ L a' m- t1 f: d. w
Sheet N°: 591/063 [+ w) A: k7 Z5 p
Page: 1 (1)
3 S. }! f1 u+ y/ {( @4 N |Subject: Short circuit and overload
6 I+ f9 O+ [' @6 Bprotection
# M7 v0 |* B; Z2 t0 W; iKey words:5 l! Z! x+ U& O+ Z# N* o. V O
- Fuse current
" ?! C1 A3 o! _5 o0 l" R! l- Overloading test
) |7 z% w; L9 `& \7 P2 E- Overload current
; _& u% d/ W) w6 \0 TMeeting:
: l8 f# u9 ~% ^# q) _2 xDecision confirmed& n! u; M3 d; ]/ _6 B2 R
at 44th CTL meeting
, j* _1 a0 d n0 n1 z1 |: M4 qQuestion: During the overloading test on the transformer according to § 15.3.2 the
. }6 x( b: s6 ~3 y# s- Ytemperature of the windings and their resistance increase and consequently the& w4 Z3 o/ V% `# E+ n; [
overload current decreases. Has the fuse current be readjusted to the original
( x" N: @# ~6 J" j# P& G7 |! @overload current during the test or no adjustment has to be made?
8 t$ E6 F/ v( pDecision: The fuse current has to be kept constant during the test. \+ L, b; d8 k7 K$ P8 V2 o! W
1 A$ g3 E* p3 v" o/ Q$ ^9 a3 P
) \' Z9 I$ `0 |5 k4 f, Z6 ^5 l |
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发表于 2012-11-8 15:07
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