Harmonics
Harmonics
(OP)
Could someone please explain how are harmonics generated. I do understand the sources of harmonics eg. induction machines, solid state devices etc.
When was the last time you drove down the highway without seeing a commercial truck hauling goods?
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RE: Harmonics
That is how harmonics are generated
Julian
RE: Harmonics
Synchronous generators can be a "source" of harmonic voltage. It is common for generators to produce enough 3rd harmonic voltage to cause problems on some systems. Higher order harmonics are also present in most generators, but at such low levels as to not be an issue.
Lastly, induction motors are not sources of harmonics.
RE: Harmonics
RE: Harmonics
RE: Harmonics
I hope this helps your understanding.
Lewis
RE: Harmonics
If an even harmonic component is added you will see (it is difficult to explain without drawing) that the resultant waveform has an interesting symmetry. The start of the postitive half-cycle is not what happens at the start of the negative half cycle. In fact the start of the positive half cycle is reflected in the end of the negative half cycle.
If the harmonic content is odd, what happens at the start of the positive half-cycle is always what happens at the start of the negative half-cycle (even if you adjust the phase shift of the harmonic). Since pratically all electrical loads behave in exactly the same way in both the positive and negative half cycle, (even if they are distorting the waveform) we only ever have to consider the odd harmonics.