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|
|  DSH 386
0 d1 B+ v( ?, u3 V, s; t# O% W
8 R; a% W, R9 \ i( t1 u* V | Overload of Transformers! y( Q" d+ e* E
| 5.4.3 (5.3.3) and App. C1
9 K( r6 }; F2 u- {2 r2 ^- J+ w | 60950(ed.2) & 60950(ed.3)
+ |6 i* P- S9 T% g3 ?& ~0 M& ~ |
5 P' j' b; i" |5 s; cStandard:: @8 ]6 @$ e6 s* s- N
IEC60950, 2nd (3rd) edition# L3 {' h9 |0 D4 X+ \( q/ R# }+ N% x/ {
Sub clause:% ]1 t3 E8 R( S8 d- Y5 n
5.4.3(5.3.3) and App. C1% _- u* B/ Q, I2 Q
Sheet n. 386
' z. H2 p+ g/ w5 dPage 1 (1)8 } B. q% r8 G0 B
Subject:) k, e' P7 T# e2 w
Overload of Transformers- d0 J, V0 J2 c; e W
Key words:
j3 w6 X# {5 T% g-Transformers" k: k0 n( Q1 H' S; A1 ~
-Overload% k5 D2 n' X5 D9 ~, f
Decision confirmed
6 u: D9 b4 u2 d% }: E! I6 ?' G |6 `at CTL 38th meeting
9 w+ {7 d- a8 C& I7 S3 VQuestion:
! _# `4 c1 L% |7 ?# Z) iHow do you perform the overload test on a transformer used in a switched mode power" L8 g( j, T, x7 T( N. P* S" J
supply? Do you agree with the following procedure?
4 j C4 E3 k5 [+ z' LA power supply output-circuit shall be loaded with the worst normal load while overloading1 I: \. y4 K+ O1 n* J% _
that secondary winding which supplies the output-circuit.
P5 C- K" v5 g9 S4 zDecision:6 G. I: Z1 e* F5 o' S! I |
The load condition at the output of the switched mode power supply which causes the: B% `$ s6 D* q2 I; }% `5 i$ O9 M0 l
greatest heating effect shall be used. The load is not likely to be a short circuit" B+ ~& `$ C: w& ]
+ o) O* x% n2 a. c! w( u
4 _0 u5 e4 W! @2 e. r: r# x3 O |
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发表于 2012-11-6 17:20
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