53 – Do all harmonics come from the loads or do some come from the utility source? 

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We talk about harmonic current coming from loads like VFDS, computer power supplies and another non-linear loads, basically pushing the current out on the system up through the busway, up through the transformers, back out onto the utility system. Because current flows in a loop. It leaves the loads, goes all the way out and comes back to the loads. So in in fact, harmonic currents are generated by the loads, but can we have sources of harmonic that come from the utility side? The answer is yes, in two ways, and in this video learn how. Harmonic FAQ Series What are harmonics and where do harmonics come from? Harmonics are generated from non-linear loads that typically include power electronics such as variable frequency drives (VFD) and LED lights. Harmonic current can cause excess heating of transformers and cables, damaging electrical equipment. Harmonics can also cause voltage distortion, often resulting in the mis operation of equipment during critical applications. Monitoring and measuring harmonics are critical steps in selecting the best harmonic solution to reduce the total harmonic distortion or THD on a power system to comply with the IEEE-519 standard. Power factor correction and harmonic resonance should also be considered. Eaton’s Harmonic Frequently Asked Question’s FAQs collection of videos presented by Dan Carnovale can help individuals from varying background and experience levels understand what harmonics are and explore varying solutions for mitigating harmonics on an electrical power system. Dan Carnovale P.E. has decades of experience in power quality and harmonics and is a recognized electrical industry expert in power quality and power systems. He is the creator and director of Eaton’s Power Systems Experience Centers (PSEC) in Pittsburgh PA and Houston TX. The PSECs provide visitors live demonstrations of hands-on power quality and harmonic situations and solutions can be seen first-hand in the Power Quality Lab. Visit Eaton’s harmonics knowledge website featuring harmonic solutions, harmonic calculators, access to white papers, and more: https://www.eaton.com/harmonics See our entire harmonics FAQs playlists: https://www.youtube.com/watch?v=U36ywxWHIy8&list=PL8XobqCtN9Z8maXVw0kYDLjmhBO275-bE For an educational overview of harmonics in person, visit one of Eaton’s Power Systems Experience Centers: http://eaton.com/experience #harmonics #powerquality #electricalengineering #electricalsafety #eatonexperience #experiencecenter