Electric Power Quality
Only one thing is certain—that is, nothing is certain,
If this statement is true, it is also false.
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 ...