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这句话要联系上下文一起看的。摘录如下:; x& a9 Z3 Y& {. d3 _
# I* D- g) P! m/ r# ~; p# x0 pFor each harmonic order, all 1,5 s smoothed r.m.s. harmonic current values, as defined in
8 G2 X& `8 B( a: V! m% u0 [8 T$ l6.2.2, shall be either:4 D* O' {& f/ ]
a) less than or equal to 150 % of the applicable limits, or, B9 h9 b9 r6 x3 a) m3 E; j
b) less than or equal to 200 % of the applicable limits under the following conditions, which" F0 V- S4 o+ I. g
apply all together:
0 ^1 K& H8 K g& e1) the EUT belongs to Class A for harmonics;" o4 h# g5 k4 W* B9 b* Q! q1 X
2) the excursion beyond 150 % of the applicable limits lasts less than 10 % of the test% a/ Z3 V* Q; ?5 f
observation period or in total 10 min (within the test observation period), whichever is
( y& _/ Q/ l. |: E- L. Lsmaller, and
7 |* j1 n+ `7 u3) the average value of the harmonic current, taken over the entire test observation
$ B4 C% B. i) vperiod, is less than 90 % of the applicable limits.
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- ]) K' D$ A. {/ N& H) ~- }0 ub)那段是2006版谐波标准新增的,相比旧标准,谐波平均值仍要满足低于100%限值的条件,而最大值条件可以有两种判定方法,即如果不满足低于150%限值,也可以用b)里面的1),2),3)三个条件来判定测试是否仍然可以通过。1)是讲必须是A类设备;2)就是ds1983解释的那样;3)加了个条件,平均值需要小于90%限值。
$ E$ P( w+ Y8 ?$ q: W0 r
! \0 j; @" X. m I8 h" _但根据经验来看,一般测试遇到谐波平均值不超标,最大值超标的情况很少。不知道指定标准的那些老先生们怎么考虑的。
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" Q. u3 s& L( l- e+ l2 ~国标暂时没有对应这个2006版的。何况2006版谐波标准尚未列在最近的EU OJ上,还没开始实施。 |
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