Inductive and capacitive loads

power factor of inductive and capacitive loads

please can anyone share his or her knowledge about power factor in inductive and capacitive loads?

inductive and capacitive loads impact on source

jitesh lulla,
For a purely capacitive or purely inductive load, the power factor is zero. For a purely resistive load, the power factor is 1. For complex loads, and sinusoidal source voltage, calculate the phase shift using Theta = |Tan-1(X/R)| where X is the reactance (capacitive or inductive) and R is the resistance, Tan-1 is the arctangent function. Power factor = Cos(Theta).
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For non-sinusoidal waveforms, the calculation is much more complicated. One way is to do a Fourier analysis of the voltage and current waveforms. Calculate the power contribution for each frequency by using the above formulas. Then the total power P is equal to SQRT{[I1V1cos(Theta1)]^2 +....[InVncos(Thetan)]^2 (Square root of the sum of the squares of the powers at each frequency. The total volt amperes is the IrmsVrms. Power factor = P/(Volt Amperes).
Regards,
Kral