Power Factor Correction

by Steve on November 1, 2009



Power Factor Correction Of Linear Loads

In the electricity industry, inductors are said to consume reactive power and capacitors are said to supply it, even though the reactive power is actually just moving back and forth on each AC cycle.

It is often desirable to adjust the power factor of a system to near 1.0. This power factor correction (PFC) is achieved by switching in or out banks of inductors or capacitors.

For example the inductive effect of motor loads may be offset by locally connected capacitors. When reactive elements supply or absorb reactive power near the load, the apparent power is reduced.


Power factor correction may be applied by an electrical power transmission utility to improve the stability and efficiency of the transmission network.


Correction equipment may be installed by individual electrical customers to reduce the costs charged to them by their electricity supplier.

A high power factor is generally desirable in a transmission system to reduce transmission losses and improve voltage regulation at the load.


Power factor correction brings the power factor of an AC power circuit closer to 1 by supplying reactive power of opposite sign, adding capacitors or inductors which act to cancel the inductive or capacitive effects of the load, respectively.

For example, the inductive effect of motor loads may be offset by locally connected capacitors. If a load had a capacitive value, inductors (also known as reactors in this context) are connected to correct the power factor.


Source information:

Many thanks to:

Power Stream











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