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这句话要联系上下文一起看的。摘录如下:4 I: r( i l. h7 i5 a% j
y4 {1 O( F1 p, J2 MFor each harmonic order, all 1,5 s smoothed r.m.s. harmonic current values, as defined in
% K0 h p: M/ V# D6 h1 R6.2.2, shall be either:
9 C: U, R- F4 G$ c' Qa) less than or equal to 150 % of the applicable limits, or
% M# V# @4 @- }, l& P2 j( Xb) less than or equal to 200 % of the applicable limits under the following conditions, which
$ Z: Q+ l( b' p P$ n4 Japply all together:. N @, i3 _0 y" l
1) the EUT belongs to Class A for harmonics;) Q7 J2 z! h3 D+ J# K8 B, w
2) the excursion beyond 150 % of the applicable limits lasts less than 10 % of the test
x1 x8 B7 X" j- W+ h4 Hobservation period or in total 10 min (within the test observation period), whichever is0 K1 T6 O) x/ W [& D2 n5 l
smaller, and
- K- C/ m( q# C$ J3) the average value of the harmonic current, taken over the entire test observation
# Q/ f: X# n! a# w% d) J# _period, is less than 90 % of the applicable limits.
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b)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。
& `3 w, Z2 \1 ^
+ c# u/ x" z; Q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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( c* k' l* v; ~4 N4 `0 @4 y0 r+ A+ A1 @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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