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    One of the reasons is the skin effect which involves pushing out the electrons from the centre of conductor towards the surface as the current frequency is increasing. As a result, the higher the frequency, the smaller the effective conductor cross section which is available for the electrons, which means that the conductor resistance increases.   Consequently, the higher the current harmonics, the higher effective cabling resistance for these harmonics which inevitably leads to more power losses and heating.

    in Harmonics