A Practical Primer On Motor Drives (Part 6): AC Line Power Calculations

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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Author & Publication:

Ken Johnson, Teledyne LeCroy, Chestnut Ridge, N.Y., How2Power Today, Jul 15 2016

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