Power Factor Improvement (PFI)

A Power Factor Improvement (PFI) Plant is an automatic power correction system installed in electrical distribution networks to compensate for reactive power generated by inductive loads such as motors, transformers, compressors, HVAC systems, and industrial machinery.

The PFI panel uses capacitor banks, contactors, and an automatic power factor controller (APFC) to maintain the desired power factor level by automatically switching capacitor stages ON/OFF according to the load demand. Improving power factor reduces unnecessary current flow, lowers electrical losses, increases system capacity, and helps avoid utility penalties for poor power factor.

PFI plants are widely used in factories, commercial buildings, shopping malls, hospitals, high-rise buildings, and industrial facilities with heavy electrical loads.

Key Features

• Automatic power factor correction (APFC)
• Improves power factor typically up to 0.95–0.99
• Reduces reactive power consumption
• Lowers electricity demand charges
• Reduces cable and transformer loading
• Extends equipment life
• Microprocessor-based controller
• Automatic capacitor switching
• Heavy-duty capacitor banks
• Detuned reactors for harmonic protection (optional)
• Digital display for electrical parameters
• Protection against overload and over-temperature

Main Components

• Automatic Power Factor Controller (APFC Relay)
• Capacitor Banks
• Capacitor Duty Contactors
• MCCB / MCB Protection Devices
• Busbars
• Detuned Reactors (optional)
• Cooling Fans
• Enclosure Panel
• Monitoring Meter

Common Applications

• Industrial Plants
• Manufacturing Facilities
• Textile Factories
• Steel & Cement Industries
• Commercial Buildings
• Shopping Malls
• Hospitals
• Hotels
• Data Centers
• Large HVAC Installations
• Power Distribution Systems

Common Types

• Automatic PFI Panel
• APFC Panel
• Fixed Capacitor Bank Panel
• Detuned PFI Panel
• Harmonic Filter PFI System
• Automatic Reactive Power Compensation System

Typical Specifications

• System Voltage: 400V / 415V / 440V AC (LV systems)
• Frequency: 50Hz / 60Hz
• Capacity: 25 kVAR – 5000+ kVAR
• Power Factor Range: 0.90–0.99
• Control: Automatic step switching
• Installation: Indoor electrical rooms or substations

Popular Brands

• Schneider Electric
• ABB
• Siemens
• Eaton
• Legrand
• Socomec
• L&T Electrical
• C&S Electric
• Havells
• Fuji Electric
• TDK/EPCOS