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|
|  DSH 386
& D! @1 W5 n4 n6 R& N. J- W6 {6 C" L3 B# n" L- p' _! E
| Overload of Transformers2 B+ v; ^# L# A! g( e2 S: }( E2 l
| 5.4.3 (5.3.3) and App. C1
/ L! ], F; o6 j' g( x) @. @3 B: y | 60950(ed.2) & 60950(ed.3)& w; E T" k5 C6 v! a
|
2 k+ p7 o: I) e0 ?. PStandard:* }0 k9 }0 S; r! M" |& N, c' H
IEC60950, 2nd (3rd) edition
) x/ Y# S' |0 ]2 o, o/ t1 ?Sub clause:
& }0 o+ A" h- p, P% d; U5.4.3(5.3.3) and App. C1
2 F$ t' a) k9 U5 @) J8 ISheet n. 3864 x7 [* n2 {/ l" h7 V9 [ K [
Page 1 (1)' v7 j8 l& F1 z; S% G$ b/ m
Subject:- X. i& P* ^9 R. B1 f" l( q
Overload of Transformers
$ P7 X' f7 C. }$ _& F) W& H: SKey words:
1 K0 Y: }/ v5 u+ x2 F-Transformers: Q4 M6 b) t/ E2 {0 B
-Overload7 Y# L$ f" w" Q- m
Decision confirmed
" w5 o$ `, d) nat CTL 38th meeting; d% y8 J9 U6 y7 c; L9 Z' I$ U
Question:
3 s2 \ Q3 X5 e/ `# N) GHow do you perform the overload test on a transformer used in a switched mode power k" M( a: `1 J7 [
supply? Do you agree with the following procedure?' p. o: y1 j6 Y; J
A power supply output-circuit shall be loaded with the worst normal load while overloading
" Y! n3 y: Q* P- I4 w2 jthat secondary winding which supplies the output-circuit.+ n4 Q' }1 W: O! Q5 \9 v( V
Decision:3 o( ~% P1 ^, E
The load condition at the output of the switched mode power supply which causes the3 [) Z: S5 Y5 `# b6 i
greatest heating effect shall be used. The load is not likely to be a short circuit8 j- t1 T6 k0 M$ `, `7 t
8 W$ r, N* q8 Q6 S
9 I5 p' k m. V J# v2 N
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发表于 2012-11-6 17:20
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