|
|
这句话要联系上下文一起看的。摘录如下:
: j% }6 N: U/ `3 b
" m$ k# g& f( B7 j% l4 F$ V) iFor each harmonic order, all 1,5 s smoothed r.m.s. harmonic current values, as defined in. Y% t) l' ]1 [# I3 R( T+ K( a2 A. I
6.2.2, shall be either:7 ~0 O: a+ f. Y. v
a) less than or equal to 150 % of the applicable limits, or
8 n+ b5 C" z$ A1 S! y0 a( ]b) less than or equal to 200 % of the applicable limits under the following conditions, which$ X* F- P* V! p# g5 V" R8 d
apply all together:
- u$ e' P- a0 Q. c* D. J r1 C1) the EUT belongs to Class A for harmonics;
* j" X' e9 @& T2) the excursion beyond 150 % of the applicable limits lasts less than 10 % of the test
. p5 [% W" ~5 K3 @9 U% L! Xobservation period or in total 10 min (within the test observation period), whichever is
2 x0 l2 g9 d$ S: t6 p- W! Rsmaller, and+ b. N7 A7 a3 [
3) the average value of the harmonic current, taken over the entire test observation
& d: h( E I6 ?3 Z( S% d) ^: zperiod, is less than 90 % of the applicable limits.) i" S8 h2 I/ e1 f4 w
+ x% p! w2 i! l0 Q: ob)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。" J/ i8 d+ T3 r" O+ S, H- p
* z7 |+ ~) C- Q- m4 J. v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。, X3 ^, N. u5 Y- n. f; f0 Z
8 S* P/ s1 Y a% |9 T
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。 |
|