Power Factor Correction: Why UK Manufacturers Should Be Reviewing Their Electrical Efficiency

As UK manufacturers continue to invest in new machinery, automation and increased production capacity, the demands placed on electrical infrastructure are growing.

While businesses often focus on reducing electricity consumption through LED lighting, solar PV and voltage optimisation, another important consideration is power factor correction (PFC).

For factories, warehouses and large commercial premises, maintaining an efficient power factor can help reduce unnecessary electrical demand, minimise certain electricity charges and improve the utilisation of existing electrical infrastructure.

What Is Power Factor Correction?

Power factor is a measure of how effectively electrical power is being used within an installation.

Many industrial facilities operate equipment containing inductive loads, including electric motors, transformers, pumps, compressors and manufacturing machinery. These loads require reactive power to operate, which can result in a lower overall power factor.

A power factor correction system works by compensating for reactive power demand, commonly through the use of automatically switched capacitor banks.

By improving the power factor, businesses can reduce the reactive power drawn from the electricity network and improve the efficiency of their electrical distribution.

Why Power Factor Matters for Industrial Businesses

A poor power factor can increase the current required to deliver the same amount of useful electrical power, placing additional demand on cables, transformers and switchgear.

Depending on the electricity supply agreement and metering arrangements, businesses may also incur additional charges associated with excessive reactive power consumption.

For manufacturing facilities with substantial electrical loads, addressing a poor power factor can provide several benefits:

• Reduced reactive power charges where applicable
• Lower current demand within the electrical distribution system
• Reduced electrical distribution losses
• Improved utilisation of existing transformers and switchgear
• Potential release of electrical capacity for additional equipment
• Improved overall electrical system efficiency

Although power factor correction does not directly reduce the useful energy required by production machinery, it can reduce avoidable losses and improve how electrical infrastructure operates.

The Importance of Maintaining Existing PFC Equipment

Many industrial facilities already have power factor correction units installed, but these systems can deteriorate over time.

Capacitors have a finite service life, while contactors, fuses, controllers and cooling components can also develop faults.

Changes to machinery and electrical loads may also mean that an existing PFC system is no longer correctly matched to the facility’s requirements.

A planned power factor correction inspection and maintenance programme can help identify:

• Failed or deteriorating capacitors
• Faulty contactors and switching equipment
• Blown fuses and defective protection
• Incorrect controller settings
• Ventilation and overheating issues
• Changes in reactive power demand
• Harmonic distortion concerns

Where significant harmonic distortion is present, particularly in facilities using variable-speed drives and other electronic equipment, suitable detuned or harmonic-rated PFC solutions may be required.

Supporting Factory Expansion and Increased Electrical Demand

When manufacturers introduce additional production machinery, electrical demand can increase significantly.

Before investing in major LV distribution upgrades, reviewing the existing power factor can help establish whether electrical capacity is being used efficiently.

A properly designed industrial power factor correction system may help reduce reactive current and release capacity within parts of the existing electrical infrastructure.

However, any proposed improvements should be supported by suitable electrical measurements and an assessment of the site’s operating conditions.

A Proactive Approach to Electrical Efficiency

At QUEST Electrical, we provide power factor correction installation, servicing, maintenance and replacement for commercial and industrial facilities.

Our experience in LV switchgear, industrial electrical distribution, power monitoring and electrical infrastructure upgrades allows us to assess PFC requirements as part of a wider approach to electrical efficiency.

Whether maintaining an existing capacitor bank, replacing ageing equipment or assessing the requirements of an expanding manufacturing facility, ensuring power factor correction equipment is operating correctly can help businesses make better use of their electrical infrastructure.

As industrial electrical demands continue to develop, reviewing power factor performance remains an important consideration for businesses looking to manage costs and improve electrical efficiency.

Is your power factor correction equipment due for inspection, or are you experiencing reactive power charges? Contact QUEST Electrical to discuss your PFC installation, servicing and maintenance requirements.

Find out more about our Power Factor Correction installation and maintenance services.