Chapter 12

Electric Power Quality

Only one thing is certain—that is, nothing is certain,

If this statement is true, it is also false.

Ancient Paradox

12.1 Basic Definitions

Harmonics: Sinusoidal voltages or currents having frequencies that are an integer multiples of the fundamental frequency at which the supply system is designed to operate.

Total harmonic distortion (THD): The ratio of the root-mean-square (rms) of the harmonic content to the rms value of the fundamental quantity, expressed as a percent of the fundamental.

Displacement factor (DPF): The ratio of active power (watts) to apparent power (voltamperes).

True power factor (TPF): The ratio of the active power of the fundamental wave, in watts, to the apparent power of the fundamental ...

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