A Practical Primer On Motor Drives (Part 3): Three-Phase AC Line Voltage

Focus:

This broad overview on motor drives continues in part 3 with a discussion on the distribution and measurement of three-phase ac voltages. Most of this discussion simply reframes the concepts and techniques discussed in part 2 on single-phase waveforms as they apply to three phase. However, this part 3 article extends the discussion with a section explaining the utility voltage classes as defined by ANSI/IEEE and other organizations. Some differences in voltage classes between the U.S., Canada and Europe are noted and some related measurement implications are discussed.

What you’ll learn:

• How to understand the basic ac voltage concepts as they apply to three-phase electrical systems
• How to measure three-phase ac voltages using oscilloscopes
• How to understand the different utility voltage classes used in ac power distribution

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Author & Publication:

Ken Johnson, Teledyne LeCroy, Chestnut Ridge, N.Y, How2Power Today, Apr 18 2016

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