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发表于 2014-1-6 11:19
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本帖最后由 jjlamshushushu 于 2014-1-6 11:57 编辑
5 j% t+ h* j: t4 e; k k! w3 k; phead0819 发表于 2014-1-6 11:03 8 \) }# e& k/ [9 L$ K3 z
28章节短路一分钟记下的是最大输出电流,33章节是变压器过载的测试。 过载测试先从condition A开始, condi ...
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table 9 里的 condition B--Rectifier to cause half wave rectified short circuit 如何操作?$ [ m( e. k p& p) n4 n
对表9中这段话如何理解?--- If the maximum available secondary winding current of 7 h5 [5 X+ M0 O
a transformer is considered to comply with the maximum allowable
. O4 x/ _9 Y' s; l" Jcurrent limitation and it is impractical to obtain the one minute current value for this test,
* X. p% M# K, j; xthe maximum measured secondarycurrent value at the time of coil burnout, or 8 A, 2 _- G; g$ {& W' I2 P3 D( p9 r
may be used to determine the overload test conditions.% h6 _ b/ q3 S9 }6 l5 |( v0 z% ~
也就是说按照条件A--I,每个条件阶段持续7小时,其实条件A的过载电流=I +(I max-I) X100%=I max
, E: r0 I) N5 X8 S; i0 R# I即:只考量I max 不大于限值8A就可以替代其他过载测试条件了。是这样理解吗?+ u, g% g) {7 j* W% j# T ^% s7 C
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