Energy efficiency: power factor correction

Energy efficiency: power factor correction

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Even with this term we are in the field ofenergy efficiency why the power factor correction it is nothing more than the intervention with which it is possible to almost totally cancel the difference between the useful power absorbed and the amount of electricity circulating in a system. The intervention of power factor correction it is generally feasible without great difficulty, after verifying the need by evaluating the power factor (cos) inferable from the bills or through measurements on the system.

Why is power factor correction convenient? One plant power factor correction correctly it allows savings that can reach a few percentage points. The savings do not stop at the internal system but also affect the distributor network. The power factor correction it is a highly reliable and feasible intervention that pays for itself in a very short time.

Let's go back to the concept of power factor correction to understand it well. The electrical loads that have a characteristic that is not purely resistive, with the same absorbed power, circulate higher currents in the electrical system. This generates greater losses and the application of penalties by the energy supplier. The power factor correction, obtainable thanks to the connection of suitable devices, allows, as mentioned, to cancel these losses and to reduce the possibility of overheating.

Keep in mind that for low voltage systems and with power greater than 15 kW: if cosφ <0.7 the user is obliged to rephasing the plant; if 0.7

You need to choose between power factor correction centralized or localized. In the localized system, a compensation device is installed on each equipment (motor, transformer, etc.) which is almost always a capacitor for inductive loads. The capacity and number of capacitors must be determined based on the characteristics of the equipment.

Alternatively or in addition to a partially system power factor correction locally it is possible to use centralized automatic compensation systems consisting of capacitor banks that are inserted according to the need for power factor correction.

The sizing is performed on the basis of the maximum amount of reactive power to be compensated. For the analysis of the system and the intervention of power factor correction contact an energy professional or a company specializing in energy efficiency interventions.