What is Power Factor Correction?
PFC (Power factor correction; also known as power factor controller) is a technique of increasing the power factor of power supply. It is a feature included in some electronic devices that reduces the amount of reactive power generated by a computer. Reactive power operates at right angles to true power and energizes the magnetic field. Reactive power has no real value for an electronic device, but electric companies charge for both true and reactive power resulting in unnecessary charges. PFC is a required feature for power supplies shipped to Europe.
In power factor correction, the power factor (represented as “K”) is the ratio of true power (kwatts) divided by reactive power(kvar). The power factor value is between 0.0 and 1.00. If the power factor is above 0.8, the devices is using power efficiently. A standard power supply has a power factor of 0.70-0.75, and the power supply with PFC has a power factor of 0.95-0.99.
PFC is not used solely for computer power supplies. In other industries, PFC equipment is used to reduce the reactive power produced by fluorescent and high bay lighting, arc furnaces, induction welders, and equipment that uses electrical motors.
Benefits of PFC:
The technical benefits: Improved efficiency and reduction in power demand, hence a reduction in the load on the switching gear and cables, reduced costs to the consumer and support for more load.
Commercial benefits: There are reduced system losses and less capital cost for the generating company. In addition, there are saving on electricity costs, since there are n o charges for the excess reactive power. Another benefit is that the transmission and distribution equipment and systems runs cooler and last longer.
Environmental benefits: reduce CO2 emissions.
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