|
|
|  PDSH 1022% k/ t6 u$ _1 @
( b, q3 |1 _0 f/ N, I% q! z
| Short circuit and overload protection6 Q3 E5 ` W2 f
| 15.3.28 h8 `$ ~3 a! J8 W$ a2 s3 C
| 61558-1(ed.1);am1 & 61558-1(ed.2);am1
# f9 q3 w: @8 ~4 T9 Z, ? b8 P% p |
# |) Y' r0 Y, W3 dStandard(s):, f% t9 W0 [' a5 @. k# k+ k" p# T
IEC 61558-19 B3 O7 a* n" X( I
All editions
6 r! x- L6 n9 g$ T( hSubclause(s):5 M% A' v& H! N0 G1 n3 l
15.3.2
" q1 ~8 j: p6 z1 a8 m" S, Y. qNo. Year+ Y, s y$ Z/ R8 {2 q4 |. s
PDSH- D c- T6 V2 N* S
1022 2010
4 f2 q1 z3 W6 U# ^' r+ dCategory: SAFE Developed by: ETF51 o2 T, f1 j. j0 D* h4 \
OSM/LUM5 i1 `) p/ _* ^2 {
Subject:6 W7 b9 Z ~' c0 X: J! a% B% E
Short circuit and overload7 |- ]! r) u7 Y
protection
+ F4 z1 N1 Z' X: [# ]& `Key words:, L0 g4 A( o6 e0 b
- Fuse current
( G2 S, l1 h, {( y$ I" S- Overloading test: Q: x2 t' u3 b
- Overload current: M6 m' y2 Y& T7 M+ d! p/ v4 Z0 B8 W
To be approved at the 49th2 @! b; A, I, H. b. y( G$ N
CTL Plenary Meeting, in 20121 I$ m1 U0 T( D1 L$ @2 m: r
Question:3 M* [) k. M Q e$ w% R
During the overloading test on the transformer according to § 15.3.2 the temperature of the windings and
6 ~, c8 H+ U( gtheir resistance increase and consequently the overload current decreases. Has the fuse current be3 Q) L9 _! W- q# a, f
readjusted to the original overload current during the test or no adjustment has to be made?
# @, {* E* C9 W) q$ dDecision:
6 z/ ]' ?, J; {& Q# } aThe fuse current has to be kept constant during the test.! H" |: V" a& C5 ]1 s, A, W
6 f% k* j! E# P5 j0 C0 ]" L0 b. D |
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发表于 2012-11-8 15:15
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