Power Factor Correction Chokes

Power Factor Correction chokes are used with capacitor banks to form a detuned LC circuit that avoids parallel resonance with harmonics. By shifting the resonance frequency below the 5th harmonic, they prevent amplification of harmonic currents. Proper sizing ensures reliable compensation and stable system impedance under distorted load conditions. 

Rated System Voltage

400 V / 415 V / 480 V / 690 V AC

Tuning Frequency

189 Hz / 210 Hz for 50 Hz systems

Inductance Tolerance

±5% (measured at rated current and 50 Hz)

Core Material

CRGO silicon steel / Amorphous metal

Insulation Class

Class H (180°C thermal endurance)

Product Description

Harmonics from non-linear loads increase RMS current through capacitors, causing dielectric failure and overheating. PFC chokes introduce inductive reactance that blocks high-order harmonics from entering the capacitor banks, enhancing thermal performance and extending capacitor service life. 

Maximum Hot Spot Temperature

155°C continuous with 180°C short-duration withstand

Rated Harmonic Current

Up to 150% of fundamental current

Total Inductor Losses

≤ 3 W per reactive kVAR at rated harmonic profile

Dielectric Withstand Voltage

3 kV AC for 1 minute between windings and core

Magnetic Flux Density (Bmax)

≤ 1.6 Tesla at rated load, below saturation threshold

Short Circuit Thermal Withstand

1.8 x Irms for 1 second (IEC 60076-6 compliance)

Detuning Reactance (Uk%)

Typically 6%, 7%, or 14% depending on required detuning frequency

Winding Configuration

Copper/Aluminum, foil or round wire, thermally balanced with insulation barriers

Mounting Configuration

Base-mounted with vibration-damped brackets and slotted holes for alignment

Acoustic Noise Level

≤ 65 dB at 1 meter under rated harmonic loading

Technical Advantages

Choke cores are constructed using low-loss CRGO or amorphous materials to handle high-frequency harmonic flux. Magnetic saturation is prevented by maintaining flux density below critical levels. Insulation systems and vacuum varnishing protect against localized heating and acoustic noise. 

Inductance is maintained within ±5% to ensure consistent tuning across capacitor stages. Windings are optimized for low AC resistance and thermal stability, supported by thermal analysis to prevent overheating under harmonic-rich conditions. 

Let's Get Started

Need reliable Chokes for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Industry Applications

Steel and Rolling Mills

Used to detune capacitor banks and suppress harmonic resonance caused by arc furnaces and large drive-based rolling equipment. 

Cement Manufacturing Plants

Applied in switchgear to prevent capacitor overheating due to harmonic currents generated by variable frequency drives in rotary kilns. 

Water Treatment Facilities

Installed in motor control centers to improve power factor stability during high-load pump operations with frequent switching transients. 

Textile and Spinning Units

Protect capacitor banks from harmonics produced by high-speed looms and inverter-fed induction motors operating under dynamic load conditions.

Oil and Gas Refineries

Integrated into reactive compensation panels to mitigate power quality issues caused by high-capacity compressors and refinery instrumentation systems. 

Data Centers

Used to stabilize reactive power flow and filter harmonics from UPS systems and non-linear IT loads connected to common busbars. 

 

Magnetic Leakage Control for EMC Compliance

Magnetic shielding is incorporated to reduce leakage flux and EMI interference in control panels. Closed-core geometry and damped mounting suppress audible noise and vibration. Designs conform to industrial EMC standards and are suited for sensitive environments. 

Chokes are designed for multi-step and thyristor-switched banks with high inrush and load variation. Core margins prevent saturation under transient conditions. Optional thermal sensors and current monitoring enable integration with automated PFC controllers. 

Having Doubts? Our FAQ

Check all our Frequently Asked Question

How does Frigate ensure accurate detuning frequency for PFC chokes in harmonic-rich environments?

Frigate calibrates choke inductance precisely to match system requirements, typically detuned to 189 Hz or 210 Hz for 50 Hz grids. Inductance is maintained within ±5% tolerance to prevent resonance mismatch. Design calculations consider short-circuit power, harmonic orders, and system impedance. Each unit is tested under simulated harmonic conditions to verify tuning behavior. 

What type of core material does Frigate use to minimize harmonic losses in power factor correction chokes?

Frigate selects CRGO or amorphous metal cores based on harmonic spectrum and thermal loading profiles. These materials offer low core losses and high magnetic permeability, minimizing eddy current heating under distorted waveforms. Flux density is carefully limited to avoid saturation under transient conditions. Core stacking, air gaps, and lamination geometry are optimized using FEM tools. 

 

How does Frigate handle thermal management in power factor correction chokes installed in enclosed capacitor panels?

Chokes are designed with thermally balanced windings, large surface area, and varnish-impregnated cores for efficient heat dissipation. Frigate performs thermal simulations considering harmonic current levels and ambient rise. Class H insulation ensures dielectric integrity up to 180°C. Optional temperature sensors (NTC/PTC) can be integrated for condition monitoring. 

 

How does Frigate reduce electromagnetic interference (EMI) in dense switchgear assemblies using power factor correction chokes?

Frigate uses closed-core designs with symmetrical winding placement to reduce stray magnetic fields. Magnetic shielding is applied when chokes are installed near sensitive control circuits. Mechanical damping prevents acoustic noise and vibration-induced resonance. EMI compliance is validated under IEC 61000-6-4 for industrial environments. 

 

Can Frigate customize PFC chokes for non-standard voltage systems or variable detuning levels?

Frigate designs power factor correction chokes for voltages ranging from 400V to 690V and can accommodate custom detuning frequencies. Application-specific parameters like harmonic order, capacitor rating, and short-circuit strength are used in the design. Custom inductance values and insulation systems are also supported. Detailed technical drawings and thermal profiles are provided for each configuration. 

 

Get Clarity with Our Manufacturing Insights

We'd love to Manufacture for you!

Submit the form below and our representative will be in touch shortly.

LOCATIONS

Registered Office

10-A, First Floor, V.V Complex, Prakash Nagar, Thiruverumbur, Trichy-620013, Tamil Nadu, India.

Operations Office

9/1, Poonthottam Nagar, Ramanandha Nagar, Saravanampatti, Coimbatore-641035, Tamil Nadu, India. ㅤ

Other Locations

GENERAL ENQUIRIES

Get Quote
Support All File Formats Including - STEP | STP | SLDPRT | STL | DXF | IPT | X_T | X_B | 3DXML | CATPART | PRT | SAT | 3MF | JT files

Power Factor Correction Chokes

Need reliable wires and cables for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Get Latest Price

Get Price Form

Power Factor Correction Chokes

Need reliable Machining for your next project? Get in touch with us today, and we’ll help you find exactly what you need!

Get Latest Price

Get Price Form