- #1
Axe199
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i am learning about harmonic analyzers and i have a couple of questions concerning them that need some sort of practical experience to answer them ( and i have none :) ) :
1-can harmonic analyzer analyze up to any harmonic? or is there a maximum ? if there is no maximum what's the highest order harmonic that is relevant to us in power systems ? i read somewhere online that when calculating THD they normally include up to the 15th -17th harmonic, and a friend told me that no one cares about what's beyond the 55th or so because these high frequencies are attenuated by the inductance of transformers or motors, so i need a practical opinion on this .
2- when i was reading about THD literally everyone was ignoring the even harmonics, i read it's because the half-cycle symmetry and it was mentioned " which is very common in power applications", so my question is there any common application where there is half cycle symmetry ( i am not speaking of dc offset which can easily be removed) i couldn't think of any tbh.
3- how do harmonic analyzers deal with different power quality problems that can affect their readings like frequency and voltage fluctuations? does the input has to be a steady periodic wave to get accurate answers?
1-can harmonic analyzer analyze up to any harmonic? or is there a maximum ? if there is no maximum what's the highest order harmonic that is relevant to us in power systems ? i read somewhere online that when calculating THD they normally include up to the 15th -17th harmonic, and a friend told me that no one cares about what's beyond the 55th or so because these high frequencies are attenuated by the inductance of transformers or motors, so i need a practical opinion on this .
2- when i was reading about THD literally everyone was ignoring the even harmonics, i read it's because the half-cycle symmetry and it was mentioned " which is very common in power applications", so my question is there any common application where there is half cycle symmetry ( i am not speaking of dc offset which can easily be removed) i couldn't think of any tbh.
3- how do harmonic analyzers deal with different power quality problems that can affect their readings like frequency and voltage fluctuations? does the input has to be a steady periodic wave to get accurate answers?
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