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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 & T+ ?: w8 [8 ^/ {" h8 x# t
head0819 发表于 2014-1-6 11:03 3 @- z1 u U2 z( ~5 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 ... " s, |+ H* R# `) }- {3 D P* n
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table 9 里的 condition B--Rectifier to cause half wave rectified short circuit 如何操作?! W6 u2 K. R, C1 \( D- Z+ \
对表9中这段话如何理解?--- If the maximum available secondary winding current of
# u F$ D3 D7 G+ c% b, W' }a transformer is considered to comply with the maximum allowable; \; q. B- B; B2 Y# W# N) s
current limitation and it is impractical to obtain the one minute current value for this test, : @& {5 O; z5 c
the maximum measured secondarycurrent value at the time of coil burnout, or 8 A, 2 q8 {( U% n( ^1 n* G' [6 w# }
may be used to determine the overload test conditions.4 [+ I5 H2 r5 F$ R8 b" t
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 max0 U% Z# a% ]5 `
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?* Q: g4 E0 }- u8 y7 t1 L+ F
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