With the increase in nonlinear loads (VFDs, high efficiency heat pumps, electronic power supplies, etc.) and the reduction in excess distribution capacity, harmonic distortion is an increasingly common power quality issue.
Most PQ equipment today can measure harmonics, but without a good understanding of what harmonics are, the numbers aren’t very helpful.
The ideal voltage waveform produced by a rotating generator is a sine wave.
A sine function can be expressed as..