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发表于 2011-6-9 16:05
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仔细看Annex C 中的C.1 overload test, ) _7 N% f4 t! S' H) D. g/ X
C.1 Overload test
9 T% Y0 X$ E" a6 D0 ?" P3 aIf the tests in this clause are conducted under simulated conditions on the bench, these$ {# a5 h9 `" X6 B1 R7 D
conditions shall include any protection device that would protect the transformer in the( X: i( E% o( [, \' A8 B4 B
complete equipment.8 Q, ? s# T' i/ B- X. @
Transformers for switch mode power supply units are tested in the complete power supply unit
1 S7 b8 k# l0 por in the complete equipment. Test loads are applied to the output of the power supply unit.! U$ R8 r2 c# M7 }7 D4 N' ?
A linear transformer or a ferro-resonant transformer has each secondary winding loaded in
9 O0 ]$ q* z: t" j0 s2 H @turn, with any other secondaries loaded between zero and their specified maxima to result in7 c5 q0 u V4 E0 {
the maximum heating effect.
4 F* r& ~" s3 q+ ~4 s; yThe output of a switch mode power supply unit is loaded to result in the maximum heating4 C5 t0 V8 P& q. Z, s
effect in the transformer.
0 P; o+ \+ C% T0 iNOTE For examples of loading to give the maximum heating effect, see Annex X.
$ V( S: B1 W1 o; ~9 s& n: i9 TWhere an overload cannot occur or is unlikely to create a hazard, the above tests are not
) n! ?7 V( `5 m# |made.& T+ o6 Y9 P; g
最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made.. F0 m. {0 d$ W1 h K0 D
我觉得可以作为不用做过载的依据。 |
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发表于 2011-6-9 15:56