Total harmonic distortion

In the course of various nonlinear transformations harmonic voltages and currents lose their ideal form. Periodic voltages and arbitrary shaped currents can be represented by the sum of their harmonics which have frequencies multiple of signal repetition frequency (i.e. the frequency of the first harmonic). Total harmonic distortion ratio determines the difference of the real signal form from perfect sine wave:

Where Ui – voltage of i-th harmonic of the signal.

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