Power Factor


Power factor and power factor correction for all types of power electronic and electrical equipment is an important factor in ensuring the overall system can operate at maximum efficiency.

The effects of having a poor power factor can lead to inefficient use of energy and as a result may lead to the increase in operating costs and poor performance.


As a result, many systems use arrangements for power factor correction is possible , PFC be applied to ensure that it achieves an acceptable power factor.

What is Power Factor?

The issue of power factor arises because for a system using alternating current, AC power, the voltage and current may not always be in phase. If the load is purely resistive, then the current and voltage will be in phase.

If the load is either inductive or capacitive, then the current will not be drawn in phase with the voltage.

If motors use inductive coils and inherently, and a lot of electronic power supplies with input transformers and chokes, they can also be inductive.


In view of these factors must define the power factor of an electrical or electronic systems.

It is possible to define the power factor of an electrical system as the ratio of the actual power to apparent power in the circuit to the load. It is a dimensionless number between 0 and 1.

In this sense, the real power is the power dissipated in the genuine warmth, that is measured in watts, and the apparent power, the voltage and current is measured by a separate meter, regardless of the stage of the current and voltage waveforms. It is measured in terms of VA.

Simple phase shift between the voltage and current waveforms occurs due to inductive or capacitive loads and is called linear loads. However generating circuits used cars or other non-linear components and nonlinear loads can also cause problems with the power factor disrupting the current waveform. In this case, the apparent power can be greater than the actual

Power Factor Correction Benefits:

There are many advantages to the use of power factor correction. The actual advantages and the extent to which they require a return on the investment are dependent on the application, the costs and the level at which the power factor correction. But the advantages are:


  • Power correction can lead to a reduction of the electricity. If the costs incurred for VA use, improvements had power factor means that a higher wattage can be consumed for the same VA consumptions.
  • impose Some power companies charge for users who have a poor power factor – it is usually applied only to commercial users. Installing power factor correction may reduce or eliminate the charges.
  • An improvement in power factor will reduce the I2R losses of transformers and distribution of equipment for a given consumption measured in watts.
  • Power correction can lead to a reduction of the heat-cables, tledswitchgear, transformers, etc., because the current is reduced for a given level of power measured in watts.
  • An improved power factor results is consumed in a lower current for a given wattage power consumption. As a result, voltage drop is reduced in cables. As a result, a smaller cables can be used in some cases.

Where more emphasis is placed on efficiency, which is driven by the cost and also green problems, there are certain advantages to the possibility to get a good power factor close to one and be able to maintain ‘t as possible. Not only do supplier down costs, but there are also advantages in terms of costs of the plant, as well as the operating costs in the form of

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Posted by on Jul 16 2016. Filed under Latest Updates, WHAT'S NEW, Power Factor, ELECTRICAL & ELECTRONICS. You can follow any responses to this entry through the RSS 2.0. You can leave a response or trackback to this entry

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