Calculating Total Harmonic Distortion

Learn how to calculate Total Harmonic Distortion (THD) as a percentage of the fundamental frequency, understanding the impact of harmonics on power systems.

Last updated November 18, 2024
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About the video

This lesson explains how to calculate Total Harmonic Distortion (THD) as a percentage of the fundamental frequency, crucial for assessing power quality in electrical systems. You’ll learn how harmonics distort waveforms and how to use Fourier analysis to break down and rebuild these waveforms. The video demonstrates the calculation method, which involves squaring the amplitudes of individual harmonics, summing them, taking the square root, and dividing by the fundamental amplitude. Understanding THD helps in diagnosing power system issues, such as overheating and inefficiency, caused by harmonic distortions. This lesson emphasizes focusing on actual harmonic currents rather than percentages, which can be misleading. To get started, go to the Lesson Content tab and click on the video.

About the quiz

Each lesson contains a video, and is followed up with a simple quiz. Quizzes review information discussed within the video, with each question providing an answer justification. Helping to reinforce correct answers and helps clarify any mistakes through code citations, excerpts, and explanations, so you can better understand the material.

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Eaton is an intelligent power management company dedicated to improving the quality of life and protecting the environment for people everywhere. We are guided by our commitment to do business right, to operate sustainably and to help our customers manage power ─ today and well into the future. By capitalizing on the global growth trends of electrification and digitalization, we’re accelerating the planet’s transition to renewable energy and helping to solve the world’s most urgent power management challenges.
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