Answer Posted / asif khan
Harmonic is presence of unwanted frequencies.
Few types of harmonics are listed below. these frequencies mainly gets generated due to modern electronic equipment e.g
Computer, inverters etc.
3rd level harmonics
5th level harmonic
7th Level Harmonic
11th level harmonics
13th level harmonics
3rd level harmonic is normal, however when it goes up to 5th or 7th it's considered a problem.
11th and 13th level harmonics usually found where rectifiers and DC loads are connected.
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