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what is hormonics. how it is generated & what are the
problem faced by that.
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Answer Posted / graeme
Harmonics are frequency components that are whole number
multiples of a fundamental frequency. For example, in a
60Hz AC supply system, 2nd harmonic is 120Hz, 3rd harmonic
is 180Hz and 4th is 240Hz.
Harmonics are most often caused by non-linear loads (eg
transformers where the line current is distorted by the non-
linear B-H characteristics in the core), rectifier circuits
and phase control circuits. In all these cases, the
resulting load current waveform is not a pure sine wave, so
harmonics are present.
Harmonics can cause all sort of problems such a voltage
waveform distortion and the different harmonic frequency
components causing different impedance values to appear in
reactive components.
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