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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,
; Y( z% _% `# s7 h% ~7 V9 dC.1 Overload test! d% u$ k) n7 A, G" o( p
If the tests in this clause are conducted under simulated conditions on the bench, these+ X3 k1 U! C9 \$ z D* N
conditions shall include any protection device that would protect the transformer in the6 h% K- V% _8 g# S2 P5 t; Z% X
complete equipment.
6 h! B. {$ m1 n7 R; T1 dTransformers for switch mode power supply units are tested in the complete power supply unit
+ v l' T& o% k& K# m: N7 f( n# For in the complete equipment. Test loads are applied to the output of the power supply unit.9 J, E- ?- h- ?8 n
A linear transformer or a ferro-resonant transformer has each secondary winding loaded in, k6 |& F0 v3 G, Y1 |9 V
turn, with any other secondaries loaded between zero and their specified maxima to result in
9 Y' R. v( k7 i, O9 {/ ithe maximum heating effect.
5 Q6 z$ j! ~0 S/ k& BThe output of a switch mode power supply unit is loaded to result in the maximum heating' W( ~ w" p( ?" s# k' H
effect in the transformer.
Q4 y" R% ]9 H; W8 k& K3 h, t" H* eNOTE For examples of loading to give the maximum heating effect, see Annex X.
& s( M" W) i1 z C# Y$ bWhere an overload cannot occur or is unlikely to create a hazard, the above tests are not1 e, Y5 S$ v9 p3 O
made.3 w% r- Z5 c+ G% }
最后这句话：Where an overload cannot occur or is unlikely to create a hazard, the above tests are not made.
+ D1 P& h+ f5 m3 E r& X; w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
