Higher harmonic voltages are sinusoidal voltages of frequencies that are integer to basic frequency (50 Hz here). Higher harmonics are undesirable in networks, as additioning the basic wave and disfigure it, which causes problems (fluke) in the supply of vulnerable consumers, for example. medical equipment that requires pure sinusoidal voltage.

An example of such distortion voltage eg. of the fifth harmonic, is shown in the picture:

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