Need Help in "Harmonics in polyphase power system"

Thread Starter

mnada

Joined Apr 5, 2012
26
Dear All,
I have a problem in understanding how the harmonic currents exist in a load with no corresponding harmonic voltages?
The following figures with questions under explain what I mean


This understood figure no issues about.



In above figure, 2 question arise::confused:

  • How the line currents are missing the triplen harmonics
  • How the phase voltage is missing the other odd harmonics except the triplen





In the above figure::eek:

  • How is the phase voltage missing all the harmonics while it's present in current.
  • Correct me if I am wrong: we can say that because triplen harmonics are in phase they cancel each other in the line cuerrent
Thank you
 

Thread Starter

mnada

Joined Apr 5, 2012
26
I really appreciate your time and effort. Your response is quite helpful
I fully agree with you that the second figure is missing the fundamental frequency voltage across the star connected load, that make perfect sense.
Regards,
 
Top