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In AC current, its a quality measurement of voltage. If voltage is harmonious or "clean" you will see an equal wave length on both sides of your baseline. You can test and see this using an electrical scope.

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Q: What is voltage harmonic?
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What are the types of harmonic filters in ups?

Basically they are of 2 types 1) Active filter - For low voltage network 2)Passive filter


Does digital voltmeter measures rms voltage or peak to peak voltage or average?

Yes, most DMM are ''average responding", giving accurate rms reading if the ac voltage signal is a pure sine wave. They measure the average of the absolute value of ac voltage and are calibrated so that reading are corrected to that of the rms value of a sine wave.Error occur if harmonic are present.


What is the harmonic factor in a power system?

Two factors reduce the power used by a piece of equipment compared to the volt-amps drawn from the supply: power factor and harmonic factor. Both factors increase the power transmission losses incurred in supplying a given amount of power.The power factor is less than 1 when voltage and current are out of phase with each other.When they are in phase the power equals the volt-amps except for a nonlinear load with a current that is not proportional to voltage. This generates harmonics in the current and the effect is that the power is less than the volt-amps, by an amount equal to the harmonic factor.


What is the frequency of the second harmonic if the fundamental frequency is 1000 Hertz?

If the first harmonic of 1 kHz is 2 kHz, then the second harmonic is the odd order harmonic of 3 kHz.


Can a 3 wire system create neutral voltages due to Harmonic distortion?

Yes, a 3 wire system can create neutral voltages due to harmonic distortion. Neutral voltages can also be caused by load imbalance between the two hots. It is normal for neutral to have a voltage differential relative to ground. Neutral is, after all, a current carrying conductor. In a well balanced system, however, there is little (theoretically zero) current in neutral.