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这句话要联系上下文一起看的。摘录如下:
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For each harmonic order, all 1,5 s smoothed r.m.s. harmonic current values, as defined in" |" c+ o# U$ L. W: e* Z8 c( B; h1 h
6.2.2, shall be either:
, u, S! Y2 O+ e. d1 {, A/ t$ Va) less than or equal to 150 % of the applicable limits, or
8 ~& k% [. o/ y& p; O; ub) less than or equal to 200 % of the applicable limits under the following conditions, which- A/ D( Z) ^* H& l {+ I
apply all together:3 n! Q+ M' V! ]3 D
1) the EUT belongs to Class A for harmonics;
! _! W9 ~9 j. ^" O2) the excursion beyond 150 % of the applicable limits lasts less than 10 % of the test
& r, l& x4 p! o. X9 R! \observation period or in total 10 min (within the test observation period), whichever is" `. _& c3 M3 f! t4 R" g
smaller, and
8 E6 c7 w3 @( C0 H4 p. v9 e/ X3) the average value of the harmonic current, taken over the entire test observation' a8 o8 A( y4 P# }" D
period, is less than 90 % of the applicable limits.
" [$ |" s( }6 a: V: a
9 b X$ q& B0 u6 F) ib)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。0 }% m% L' e& i6 [1 @) [- F Y ^
5 h# d9 [) z! }1 @& O+ \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。' D* `* T8 L4 p( H# L- V! W
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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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