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|  PDSH 1022
2 ?, X- t5 y& E: }. A* b' l' ~" }. s
| Short circuit and overload protection& _/ M9 \+ P q5 C; W, f& T7 ?6 H
| 15.3.27 }8 V9 F% m0 ^& O I7 t' F% U
| 61558-1(ed.1);am1 & 61558-1(ed.2);am1
/ s( w* Z) b& q" S+ r V" d" V |
: Q) A' h2 y. V0 c
Standard(s):" A9 F6 O) w e
IEC 61558-1
9 l, G- W/ ~, o* X( GAll editions! G' c; i( C1 W
Subclause(s):3 T! N" h! l. O; m- _: Z# G
15.3.29 }" P; m' L# T- z
No. Year
# c+ q( s# U. P! v* q9 iPDSH5 X7 j, B5 d% \& `5 P+ V! x$ s
1022 2010
/ B6 t2 x# s# E/ D+ ^! s& ECategory: SAFE Developed by: ETF5
H, y* p( Z' q/ _/ F1 x' Q. dOSM/LUM$ `+ v/ q! i4 m
Subject:" t' R; k( L- X% Y
Short circuit and overload
, o1 E( P) f7 u. S1 Wprotection! m3 m$ X9 a! Y" @, l7 j: {. s( {
Key words:4 x- n2 R/ ~+ Y! P
- Fuse current) X9 r2 w5 h z- q* {" R
- Overloading test
2 @4 ?7 i5 ^4 I: g$ D4 F- Overload current
( X' F. [) A: E+ CTo be approved at the 49th
' }1 t( U8 Q# Q% ]CTL Plenary Meeting, in 2012/ B B$ ~' s( g k& P; v) |
Question:9 a; `; g+ Y5 W0 J1 y# M- S3 L
During the overloading test on the transformer according to § 15.3.2 the temperature of the windings and( g+ e* A) _. {/ Z2 p' Z8 M7 p, r
their resistance increase and consequently the overload current decreases. Has the fuse current be& g- u5 ~# s$ f
readjusted to the original overload current during the test or no adjustment has to be made?0 c4 @1 T3 x6 S) b3 A: K
Decision:
+ l6 I; n) P u* m$ RThe fuse current has to be kept constant during the test.+ i/ l' `. ^( H o
* ]0 e4 E) {: f' p+ m; R9 c$ e6 P6 d |
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发表于 2012-11-8 15:15
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