Harmonic voltages and currents in an electric power system are a result of non-linear electric loads.

**Harmonics**

**Introduction**

Harmonic
voltages and currents in an electric power system are a result of non-linear
electric loads. Harmonic frequencies in the power grid are a frequent cause of
power quality problems. Harmonics in power systems result in increased heating
in the equipment and conductors, misfiring in variable speed drives, and torque
pulsations in motors

A
harmonic of a wave is a component frequency of the signal that is an integer
multiple of the fundamental frequency, i.e. if the fundamental frequency is f,
the harmonics have frequencies 2f, 3f, 4f, . . . etc. The harmonics have the
property that they are all periodic at the fundamental frequency; therefore the
sum of harmonics is also periodic at that frequency. Harmonic frequencies are
equally spaced by the width of the fundamental frequency and can be found by
repeatedly adding that frequency. For example, if the fundamental frequency
(first harmonic) is 25 Hz, the frequencies of the next harmonics are: 50 Hz
(2nd harmonic), 75 Hz (3rd harmonic), 100 Hz (4th harmonic) etc.

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Power Quality : Harmonics : Harmonics |

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