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# non-sinusoidal waveform harmonic quantities

1. Junior Member Pro Subscriber
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## non-sinusoidal waveform harmonic quantities

Do we have to find the harmonic quantities when we found non-sinusoidal waveform in power circuit? Or to find magnitude and phase angle? Is there anyone can explain it?

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## Non-sinusoidal waveforms have harmonics, magnitude and phase angle

Originally Posted by J2019L
Do we have to find the harmonic quantities when we found non-sinusoidal waveform in power circuit? Or to find magnitude and phase angle? Is there anyone can explain it?
Let me try to respond:

A pure sine wave will only have the fundamental frequency and no harmonics. It will however have a magnitude and a specific phase angle at the specific measurement point.

Any other waveform besides a pure sine wave will include harmonics. In fact even a perfect a square wave is an infinite summation of a fundamental sine wave and it's harmonics.

All real-world power circuits will include harmonics, but you don't necessarily "have to find" them. They are normally not going to affect your equipment. Due to the load, magnitude, harmonics and phase angle will be introduced even if the source is a pure sine wave.

For example, electric motors and VFD drives will produce phase angle and harmonics.

You can use a Power Quality analyzer to measure such quantities.

The following discussion may help you visualize the problem:
https://electronics.stackexchange.co...do-they-appear

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