Overview
This webinar is designed to show how harmonics are generated by modern electrical and electronic systems. It starts with classical harmonic generators and some older electronic devices. It emphasizes single phase systems and how harmonics are generated by diodes, silicon controlled rectifiers, and triacs. Special emphasis is made of the fact that it is the harmonic currents that flow that cause the harmonic voltages to be present. These harmonic voltages can affect other equipment, and even other customers on the electric grid. Many pictures and graphs are presented to show how harmonics can be present. At times, it is not at all obvious that harmonics are present in a signal. Even if they are not seen, the harmonics can cause problems for the power companies, which have the responsibility of delivering clean usable power to their customers.
Both electrical engineers and engineers of other disciplines will benefit from this presentation. Electrical engineers will have a deeper understanding of how harmonics are generated. Engineers from other disciplines will get an idea of the problems faced by the people responsible for delivering power to their facilities. This will help engineers understand each others special problems. The more that we, as engineers, understand the problems faced by other engineers, the better that we will be able to do our specific jobs.
There is very little math required for this webinar. Graphs were generated by use of Excel programs. It helps, but is not necessary, to understand how Excel can generate graphs and charts.
At the conclusion of the webinar, examples are given showing how the third harmonic can cause excessive neutral currents to flow in a three phase Wye voltage source feeding a three phase balanced resistive load.
Needless to say, the real industrial world is not nearly as clean and nice as we would like it to be. These examples only show what is expected to happen. What really does happen as harmonics are generated will usually be close to what is expected. In any case, actually measuring the harmonics present with a power analyzer will give you the harmonics that are actually present.
Learning Objectives
In this 2-hour webinar, you'll learn ...
- Historical causes of harmonic distortion
- Harmonics of a square wave
- Harmonics caused by half wave single phase rectifiers
- Harmonics caused by full wave single phase rectifiers
- Harmonics in three phase systems
- Understanding harmonic generation in 6 and 12 pulse full wave rectifiers
How Webinars Work
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System Requirements
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Registration Deadline
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Accessing the Webinar
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Then, using your computer, go to the website shown in the instructions and enter the access code as shown. You will be asked to enter your name and email address.
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Printing Your Certificate
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Cancellation Policy
You may cancel your enrollment in this webinar up to 48 hours prior to the event and receive a full refund less a $10 registration service fee. Cancellations made less than 48 hours prior to the webinar, but at least 4 hours prior to the scheduled starting time will not be refunded, but can be credited to a future webinar. Cancellations made less than 4 hours before the webinar are not refundable.
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