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本帖最后由 jjlamshushushu 于 2014-1-6 11:57 编辑
5 ~1 S+ q2 M8 {7 i7 ?head0819 发表于 2014-1-6 11:03
8 M9 _: x. B/ D4 b0 F28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 ...
9 [( X& e0 }: X" h9 S4 A
9 M0 ~7 e4 a8 A! a9 @ s/ x4 S( {table 9 里的 condition B--Rectifier to cause half wave rectified short circuit 如何操作?
. j, }0 d& h# @0 ?0 F. S9 m对表9中这段话如何理解?--- If the maximum available secondary winding current of 7 G) C0 g G" a" a8 b
a transformer is considered to comply with the maximum allowable
0 k0 W, C5 G2 k) o. jcurrent limitation and it is impractical to obtain the one minute current value for this test,
( T& s3 ~1 z U3 U5 R- Fthe maximum measured secondarycurrent value at the time of coil burnout, or 8 A, 6 Q7 C; i1 R; J! z) m
may be used to determine the overload test conditions.5 o0 x3 w$ h: N( a B' S- i
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 max8 M- }4 [( r7 `0 v# h0 F+ }
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?: C" q0 L" X$ G
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