Best Answer

The best way to improve power factor is by adding capacitors. Low power factor is due to reactive loads (motors, pumps, etc.) that are connected to your electrical system.


The best way to improve power factor in the case of motors is to use a motor drive, like a Variable Frequency Drive. These drives allow very precise control over a motor, unlike the very sudden, jerky starting and stopping across the line seen when using a motor starter. They eliminate the huge inrush current required to start motors that causes low PF.


1) Power factor can be calculated by connecting an energy meter [P] (voltage coil in parallel & current coil in series with the load), a voltmeter [V] across load and an ammeter [A] in series with the load. Measure P, V & I.

Since, Active Power (P) = V.I.Cosϕ

power factor = Cosϕ = P/VI

2) Power factor is usually (industrially) improved by connecting a shunt (parallel) capacitor bank at feeding end.

How it works??

Inductive loads contain both inductors and resistors. But due to phasor difference of coils and caps when voltage is applied across both, the two currents results in a smaller net current finally. So now the angle (ϕ) between the voltage phasor and current phasor is lessened. When ϕ is reduced, Cosϕ is risen resulting in a higher power factor.

User Avatar

Wiki User

โˆ™ 2011-03-16 17:54:54
This answer is:
User Avatar

Add your answer:

Earn +5 pts
Q: What are the methods to calculate and improve power factor?
Write your answer...

Related Questions

Causes of low power factor methods of improving power factor?

using highly inductive loads may lead to reduction in the power factor. or consumption of unappreciable amount of power also results in the same. methods to improve PF . using synchronous condensers using capacitor banks using ow inductive loads

Can we improve generator power factor for increasing active 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.

How is a capacitor connected in a circuit to improve the power factor?

A capacitor is connected across the line voltage to improve the power factor.

How power factor helps to improve circuit?

Improving power factor does nothing to improve a circuit. It merely affects the amount of current drawn by the load.

Is it possible for a utility to raise the power factor to unity?

No. They can improve power factor with capacitors, but they can not raise it to unity.

Why the power factor improves with the load?

Power factor doesn't necessarily 'improve with the load', but it is determined by the load.

Why does a capacitor improve power factor?

yes power capacitar ust inprove the power factor and sae the kvah reding

How to calculate power factor what is unit of apparent power?


What can be done to improve the power factor?

Adding capacitance.

What is the technique of improve the power factor?

Simple technique by adding PP capacitor with automatic power factor controller.

What is the use of synchronous machines in power grid system?

To improve the power factor

How do you calculate power factor if power is unknown?

There are various ways. For example, power factor can be determined from the ratio of resistance to impedance.

How synchronous motor can improve power factor of certain load connected to power system?

Large electricity users like factories have to watch the power factor of the load they place on the supply. For most pieces of equipment the power factor is a lagging one and the problem therefore is to improve the power factor of the whole factory by placing a load on the supply with a leading power factor. A synchronous motor operates at a power factor determined by the excitation current. With a low excitation the motor operates at a lagging power factor, but by increasing the excitation it can be made to operate at a unity power factor and then a leading power factor. Therefore a factory with synchronous motors has an option to improve the overall power factor by adjusting the excitation of any synchronous motors that are in use.

Can the capacitor be inserted in series in order to improve the power factor?

In a circut we use capacitor in series for improving power factor

Why inductor is used in electrical circuit?

To improve the power factor

What are the devices used to improve power factor?

shunt capacitors

How calculate the power factor?


How do you calculate power factor kvr?

Power Factor = KVA/KW. This has no unit. Its value is always 1 or less.

How the capacitor valve calculate for a for a load?

I assume that you are asking how to calculate the 'value' of a capacitor? Well, it depends what it is used for. If, for example, it is used to improve the power factor of a load, then it is first necessary to determine what the load's existing reactive power is; then, you need to know what reactive power is necessary with the power factor at its desired value; finally you need to difference between the actual and the desired values of reactive power -and this will be the necessary value for the capacitor. Power factor correction capacitors are rated in reactive volt amperes, not farads.

How do you calculate capacitance to improve power factor in a industry?

You don't normally care what the capacitance of a power-factor capacitor is, as power-factor improvement capacitors are rated according to their reactive power (reactive volt amperes). Their capacitance (in farads) are only of academic interest. The basic procedure is to determine your load's existing reactive power, then determine the necessary reactive power to achieve the desired power factor. The difference between the two will give you the necessary reactive power of the p.f. improvement capacitor.

If a load takes 50 kW at a power factor of 0.5 lagging Calculate the apparent power and reactive power?

If a load takes 50 kW at a power factor of 0.5 lagging calculate the apparent power and reactive power Answer: Apparent power = Active power / Power Factor In this case, Active power = 50 kW and power factor = 0.5 So Apparent power = 50/0.5 = 100 KVA

What is a method to improve the power factor?

Add capacitors from line to ground.

What the use of the capacitor in fluorescent lamps?

to improve the power factor of the circuit.

How do you calculate actual power factor?

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 anglepower factor = true power / apparent powerpower factor = resistance / impedancepower factor = votage across resistive component / supply voltageetc.

Why is power factor important and why would you want to improve it?

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.