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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, ( W1 }& I1 Z! {7 j5 v$ w7 k: O3 A% B) v
C.1 Overload test
* w' I. b2 j9 M" U" ~$ O/ yIf the tests in this clause are conducted under simulated conditions on the bench, these
* d8 |) T; ]0 S$ e1 econditions shall include any protection device that would protect the transformer in the
! H, M j' `9 zcomplete equipment.
* Z) O, w; w! e) d# LTransformers for switch mode power supply units are tested in the complete power supply unit
$ Y* u: s! u3 r, _# a+ Ror in the complete equipment. Test loads are applied to the output of the power supply unit.3 Z9 z+ x- H0 N% P
A linear transformer or a ferro-resonant transformer has each secondary winding loaded in
# M4 J" H3 I( _, o5 @" _: Y3 gturn, with any other secondaries loaded between zero and their specified maxima to result in/ s, n; U+ c" P; }+ `
the maximum heating effect.
2 D9 M f3 K3 e) S) Y2 q! c6 m% ^6 @The output of a switch mode power supply unit is loaded to result in the maximum heating
- `$ j4 N& z' e& f. m+ meffect in the transformer.
! t$ Z$ m7 q6 L* qNOTE For examples of loading to give the maximum heating effect, see Annex X.
8 O) z" d4 b" I( T. W1 a! R0 kWhere an overload cannot occur or is unlikely to create a hazard, the above tests are not% C4 A* y' b: U0 b1 F
made.
3 {/ S& p/ |; q$ L6 P最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made.
3 V9 k" z; d M6 i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
