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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, 5 m2 X/ |4 [9 Z% S: V- m5 E( {
C.1 Overload test
3 S! W" f) d9 S1 j0 b8 ^; T2 {If the tests in this clause are conducted under simulated conditions on the bench, these
3 l" u. f% }/ i9 [2 h2 q2 H: Qconditions shall include any protection device that would protect the transformer in the
# H6 r! F" w- T/ h! L, Icomplete equipment.
+ E, b: U: R7 `( j \. p2 `" [ m; r! K' QTransformers for switch mode power supply units are tested in the complete power supply unit2 ?% A- C" }0 W
or in the complete equipment. Test loads are applied to the output of the power supply unit.2 K, U; `6 W7 r3 B% N& D
A linear transformer or a ferro-resonant transformer has each secondary winding loaded in0 J O3 d' D. m3 \, w
turn, with any other secondaries loaded between zero and their specified maxima to result in
8 f) a9 j5 s ]/ s0 q' c% r" rthe maximum heating effect.# W3 f. b. H* k5 \! @, W4 M" Z
The output of a switch mode power supply unit is loaded to result in the maximum heating8 _% h @6 t, f3 \5 r0 G+ K; Z
effect in the transformer.
/ O% i5 m* y- p7 _0 U9 e' G4 D7 lNOTE For examples of loading to give the maximum heating effect, see Annex X.
) ~/ L7 K9 a1 [; a7 w+ Z0 T9 { [Where an overload cannot occur or is unlikely to create a hazard, the above tests are not
& X* h0 {8 w9 ]+ j- emade.
( e" F5 Q9 r5 P最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made.
5 W% q& q6 z3 w4 f7 q- m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
