|
本帖最后由 jjlamshushushu 于 2014-1-6 11:57 编辑 0 r/ x. t$ w7 i$ u; C. T- t8 \
head0819 发表于 2014-1-6 11:03
# K& u0 P; w$ d: M, I" a% i- q1 j28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 ... , d/ g, t0 J, j
" W; A' h! Y) a9 m5 W$ {2 B
table 9 里的 condition B--Rectifier to cause half wave rectified short circuit 如何操作?
( R8 i9 K; P, i对表9中这段话如何理解?--- If the maximum available secondary winding current of 6 }* B0 q5 z b, I7 y
a transformer is considered to comply with the maximum allowable; _" L) |) [. K- T' D
current limitation and it is impractical to obtain the one minute current value for this test, 0 _6 M( ~& G" T/ F' \% U
the maximum measured secondarycurrent value at the time of coil burnout, or 8 A, ' E. R0 R) ~3 e8 M H9 U
may be used to determine the overload test conditions.
" C/ w5 T! n7 B5 M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! Y& d, b$ F5 v( E) h( c
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?
& P1 T( K+ n* o1 ^/ I0 {; O |
|