A Practical Primer On Motor Drives (Part 6): AC Line Power Calculations
by Ken Johnson, Teledyne LeCroy, Chestnut Ridge, N.Y., How2Power Today, Jul 15 2016
Focus:
Having discussed measurement of voltages and currents in previous chapters, the discussion now
turns to calculation of power as encountered in motor drives. This part reviews the
relationships between voltage and current in linear and nonlinear loads, relationships between
real and reactive power and how these parameters are calculated including the significance of
phase angle and power factor. Requirements for sampling of voltage and current waveforms to
enable accurate power calculations are also reviewed and measurement examples demonstrate how
the power-related parameters are calculated by instruments such as the Motor Drive Analyzer.
This section focuses specifically on power calculations in single-phase systems and the section
concludes with a brief description of single-phase ac wiring configurations.
What you’ll learn:
- How to calculate and measure various ac line power parameters such as real power, apparent power, reactive power, power factor and phase angle
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