Power Factor Correction

Power quality is critical to create efficient operation of equipment. One contributing element to power quality is power factor.

Power Factor Correction (PFC) improves power factor and power quality, utilising capacitors to offset usually inductive loads, for example motors. PFC systems increase the efficiency of power supply, delivering immediate cost savings on electricity by reducing energy demands.

When is Power Factor Correction right for you?
Are you experiencing…

  1. High energy usage and costs
  2. Electrical or electronic equipment failure
  3. Motor failure
  4. Overheating of transformers, switchgear and cabling
  5. Tripping of circuit breakers or fuses

How Does Power Factor Correction Work?

Power Factor is a measure of how effectively incoming power is used in electrical systems. It is defined as the ratio of Real to Apparent (total) power where:

  • Real Power is the power that actually powers the equipment and performs useful, productive work.
  • Reactive Power is required by some equipment (eg. transformers, motors and relays) to produce a magnetic field for operation; however it does not perform any real work.
  • Apparent Power is the vector sum of Real and Reactive Power and corresponds to the total power required to produce the equivalent amount of real power for the load.

Power Factor Correction

Power Factor Correction may be required where a system has a power factor of less than 90% (or 0.9). A poor power factor can contribute to significantly higher than necessary energy costs since it means that more current is required to perform the same amount of work and equipment instability or failure. By optimising and improving the power factor, power quality is improved, reducing the load on the electricity demand.

Power Factor Correction 2

PFC equipment results in a decrease in the electrical demand by using a bank of capacitors to offset an inductive load.

Power Factor Correction 3

What We Offer

Energy Efficiency Specialists Group offer a range of products and services to improve power factor.


Our Power Factor Correction equipment maintenance includes checking that the system is operating at optimum performance levels. We check the following:

  • Onsite energy audit
  • Electricity load reduction
  • Harmonic content
  • Offer a range of solutions
  • Voltage levels

This level of maintenance is recommended by manufacturers to be undertaken every 6 months, or as required.

A comprehensive report is supplied on completion detailing the works carried out. It includes specific recommendations for consideration.


Energy Efficiency Specialist Group offer a range of low, medium and high voltage PFC solutions.

1. OPTIVAR – Solid State Switched capacitor banks provide faster operating times by using thyristors instead of contactors for switching. The OPTIVAR system is specifically designed for applications where very fast load fluctuations exist and conventional PFC systems response times are unsuitable. The very high speed switching operation is designed for dynamic power factor compensation.

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