A Practical Primer On Motor Drives (Part 3): Three-Phase AC Line Voltage
by Ken Johnson, Teledyne LeCroy, Chestnut Ridge, N.Y, How2Power Today, Apr 18 2016
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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