How do you get power factor?
Single phase PF = Input Watts/Volts x Amps. Three phase PF =Input Watts/Volts x Amps x1.732.
You can determine the power factor of a circuit using three instruments: a voltmeter, and ammeter, and a wattmeter.
Multiplying the voltmeter reading by the ammeter reading will supply the value of the apparent power in volt amperes. The wattmeter reading will supply the value of the true power in watts.
Divide the number of watts by the number of volt amperes, and that will indicate the power factor of the circuit.
There are a number of different ways of determining the power factor of a load, depending on what information you have access to. For example: power factor = cosine of phase angle power factor = true power / apparent power power factor = resistance / impedance power factor = votage across resistive component / supply voltage etc.
Effective Power = Volts x Amps x Power Factor Power Factor ranges from 0 to 1. At a Power Factor of 1 the load is pure resistive and the current and voltage are exactly in phase. As the voltage and current get out of phase the Power Factor decreases and you reduce the power. Therefore, a Power Factor of 1 is most efficient.
Why you use low power factor wattmeter on primary and unity power factor on secondary side of transformer?
Definitions of Power Factor in electricity can be given in different ways as described below: 1) Power Factor is the Cosine of the angle between the voltage vector and the current vector. 2) Power Factor is the ratio of the resistance to the impedance of the circuit. 3) Power Factor is also defined as the ratio of true power to apparent power.
The 0.8 Power Factor provided by generator manufacturers is not the load power factor, but it is the nominal power factor used to calculate the kW output of an engine to supply the power for a particular alternator kVA output. Alternators are therefore designed to supply their rated kVA at 0.8 lagging power factor.