How the harmonics generated in electrical system?

breif origin of harmonics and there effects

Answer:
In power systems, harmonics are generated by many means. The simplest and most general explanations are as follows:

Non linearities in the system (such as a simple diode) that change your incoming signal (assume it's a pure sine wave) in other than amplitude or phase will produce harmonics of the fundamental. If my input signal is 60 Hertz and I full wave rectify or do anything to change it in other than amplitude or phase, you will have harmonics of the 60 hertz. The harmonics are integer multiples of the original fundamental (60 hz)
variation in freq.i.e. multiples of the operating freq...........
harmonics are generated by non linear loads such as pcs ,electronic chokes ,stereos ,tvs fax machines ,induction furnaces,etc

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