Enevo Group - SCADA Systems | Process Automation | Engineering & Design | Dispatch & Telecom | Protection & Control | Power Factor Correction (PFC)
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Power Factor Correction (PFC)

Improving the power factor means taking the necessary steps to increase the power factor in a defined section of the installation by locally delivering the necessary reactive power so that the value of the current and consequently of the power flowing through the upstream network can be reduced, at the same required output power. In this way, the lines, the generators and the transformers can be sized for a lower apparent power.

Improving the power factor is a solution which allows technical and economic advantages; in fact, managing an installation with a low cos φ implies an increase of costs for the power supply authority, who consequently applies a tariff structure which penalizes the withdrawal of energy with low power factors.

The legislative measures in force in the different countries allow the national power supply authorities to create a more or less detailed tariff system. Such system is structured so that the absorbed reactive energy exceeding that corresponding to a cos φ equal to 0.9 must be paid according to defined amounts depending on the voltage level of the supply (low, medium or high) and on the power factor. According to the tariff system applied, the consumer can determine the amount of his own additional charge and therefore can evaluate the savings on the penalties to be paid in comparison with the cost of an installation for power factor correction.

According to the location modalities of the capacitors, the main methods of power factor correction are:

  • distributed power factor correction;
  • grouped power factor correction;
  • centralized power factor correction;
  • combined power factor correction;
  • automatic power factor correction.

Advantages

  • Reduce energy losses by up to 30%. Optimize power consumption, reduce total process energy consumption and reduce CO2 emissions.
  • Reduce reactive energy billing penalties and lower operating expenses up to 10%.
  • Boost power factor to lower utility bills and reduce losses in transformers and conductors.
  • Increase network capacity
  • Economically plan new electrical infrastructure
  • Reduce voltage drop
  • Reduce the effects of starting large machines

Compensation Type

5659

Automatic compensation

This compensation type is used for unstable loads. The PLC equipment will automatically adjust the reactive power according to variations in load  and/or power factor. It is recommended to use automatic compensation when the capacitor bank’s power is more than 15 % of the power of the transformer, in order to avoid overcompensation.

Fixed compensation

This compensation type is used for stable loads, with synchronized voltage and current. The equipment will supply a constant reactive power irrespective of load variations.

Application

  • Large choice of wall-mounted enclosures and floor-standing units up to 1,150 kvar
  • Automatic compensation for variable and unstable loads
  • Fixed compensation for stable loads up to 200 kvar
  • Extensive range of electrical steps complement to match your loads and processes
  • Suitable capacitors for any harmonic level and type of load
  • Medium voltage solutions up to 13.8kV