A Practical Primer On Motor Drives (Part 4): Single-Phase AC Line Current

Focus:

This broad overview on motor drives continues in part 4 with a discussion on the measurement of ac line currents. Concepts such as wye (star) and delta connections in three-phase systems and utility requirements for THD are briefly discussed. Then the basic concepts of ac line currents and measuring current in single-phase ac systems are explained. Measurements demonstrate the impact of linear (resistive) and nonlinear loads on the current-versus-voltage relationship.

What you’ll learn:

• How to measure ac currents in single-phase systems using oscilloscopes

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Author & Publication:

Ken Johnson, Teledyne LeCroy, Chestnut Ridge, N.Y., How2Power Today, May 16 2016

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