Re: Power Factor
Ramsy,
This PF(THD) assumes Zeor harmonics on the voltage side, correct? So what happens when there is harmonics on the voltage? How do you find PF?
Assume you have an RL load of 100 ohm resistor and 100 mh inductor with voltage source of 120v, 60hz, that contains 10% 3rd harmonics superimposed on it,i.e, it is in phase with the fundamental?
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Power-quality analyzers will most accurately measure current THD, and differentiate the fundamental-displacement-power factors (dPF), from current and voltage root-mean-square (rms) values that may include harmonic currents PF(TOT).
dPF = WATT/VA*Sqrt(phases)
PF(THD) = Sqrt[1/(1+THD^2)], where THD = current harmonics.
PF(TOT) = dPF * PF(THD)
