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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,
0 _/ S9 E) P! A0 s$ tC.1 Overload test
+ i" [2 ?; K3 K9 kIf the tests in this clause are conducted under simulated conditions on the bench, these4 ^. m# c! F2 E- w' P2 n. C
conditions shall include any protection device that would protect the transformer in the: J# D1 c* I/ a0 w
complete equipment.# v* e t, k6 ^( W Q) t% C" }/ l
Transformers for switch mode power supply units are tested in the complete power supply unit
: ?. i# @$ _3 X wor in the complete equipment. Test loads are applied to the output of the power supply unit.- T, D/ k% ~/ y$ E5 Y$ S
A linear transformer or a ferro-resonant transformer has each secondary winding loaded in
# P# P2 `8 [& L# v. h+ [turn, with any other secondaries loaded between zero and their specified maxima to result in: m) z% d, v: d# x
the maximum heating effect.- \6 ~$ e$ K8 a1 w' D2 c( }
The output of a switch mode power supply unit is loaded to result in the maximum heating% B. |4 H' ~& @& [
effect in the transformer.4 B. f5 S" s- [2 ~: O5 y: p, m7 i/ t
NOTE For examples of loading to give the maximum heating effect, see Annex X.9 Q R+ |( Z* j+ M+ `+ D
Where an overload cannot occur or is unlikely to create a hazard, the above tests are not
/ d2 ]& c5 W9 x+ Cmade.
! |+ h4 c# @2 m最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made." c& M9 U9 E6 n$ i) w# y
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