50 – How does a delta zig-zag transformer eliminate or minimize harmonic currents?

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Explore the function of delta zig-zag transformers in eliminating or minimizing harmonic currents. By first reviewing concepts of positive, negative and zero sequence harmonics, we explain how these transformers are designed to trap and recirculate triplen harmonic currents on the secondary, preventing the 3rd harmonics from coupling and entering the primary winding. This video also contrasts the operation of a standard delta wye transformer vs. a delta zig-zag transformer, emphasizing the delta zig-zag transformer’s phase shifting capabilities, allowing loads to continue to operate as designed while minimizing the impact of harmonics on the electrical infrastructure. 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 with live demonstrations of hands-on power quality and harmonic situations and solutions that 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