Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [harmonics]

Questions related to frequencies that are generated by mixing other fundamental frequencies.

179 questions
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How to use Step Recovery Diodes?

I want to build a frequency multiplier with high multiplication factor. I read some application notes of Hewlett Packard on Step Recovery Diodes. I think a SRD can do what I want. However, I have never used one before. Since they are difficult to…
T. Pluess
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Sources of Harmonics(Odd and Even)

Exploring into harmonics this post explains very nicely about the odd and even harmonics with their individual importance. But what comes to my mind is: What are the sources of harmonics? Why are they generated? Here is the document from National…
AKR
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Weighted Total Harmonic Distortion

What does make difference between a WTHD and a THD from practical point of view? Where and when the WTHD is more prevalent than THD?
settimed
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Harmonic voltage source, how to calculate it

I have this scheme. I have all the parameters: L1=110 uH C1=160 nF C2=5 nF Rt=1.2 kΩ ω1=45290 rad/s ω2=162089 rad/s ω3=238366 rad/s ω4=276982 rad/s But I dont understand how to calculate the voltage source. I have this formula for it: So my job is…
Simeon Simeonov
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Calculating harmonic distortion

I know that the total harmonic distortion (THD) in a power system with n harmonics is calculated by the below equation: THD=\$\frac{\sqrt{(V_2^2+...+V_n^2)}}{V_1}\$ but what about any single harmonic? Is it true that calculate harmonic distortion…
Reyhaneh Amouie
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Average power of a non-linear load

I have the following formula to calculate the average power dissipated in a non-linear load: I would like to know what happens if the phase between the voltage and the current (for a specific harmonic) is greater than 90 degrees. Mathematically,…
JustCurious
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Harmonic n intensity varies greatly between phase - Is it important?

I tried to find explanation over this - maybe my terminology is wrong, couldn't find anything. I wondered if it's important the for 3rd harmonic, intensity of voltage of Phase A is almost half the one of Phase B? Also, if there is data about it on…
Mathias Boulé
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Harmonics in neutral conductor

If he multiplied the 10 A by 3 this means each phase has 10 A of harmonics. So, shouldn't they cancel out at the neutral just like the rated frequency currents?
OMAR
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Fundamental vs true RMS values - Can the fundamental be higher than true RMS

Here is a practical situation: We are measuring harmonics with a Class-A PQ device. At certain times we have the fundamental values of current higher than the true RMS values. I would like to know if such phenomena can happen and in what situation.
Hari
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