Total Harmonic
Distortion-THD
THD for a system
depends on many factors. Those factors include Structure
impedance, transformer impedance, ratio of non-linear to
linear power-consuming devices, and already present
harmonic distortion levels.
THD (Total Harmonic
Distortion) measurement
The THD is
defined by the following formula:
where terms 2..N are
the power levels of the harmonics and term 1 is the
power level of the fundamental.
The THD+N is
defined by the following formula:
where term n is the
noise power level
The THD (total
harmonic distortion)
The
total
harmonic distortion, or
THD,
of a signal is a measurement of the
harmonic distortion present
