Energy, APFC & Power Quality · Electrical & Drives
APFC / Power Factor Correction Calculator
Estimate reactive-power compensation, current reduction and detuned-reactor screening values.
This tool provides a preliminary engineering calculation for reference. Final equipment selection, design and commissioning decisions must consider manufacturer data, applicable standards, operating conditions and project-specific engineering requirements. It is not certified design output.
Preliminary result
Calculated outputs
Enter values and select Calculate. Results are estimates and do not replace nameplate data, applicable standards, or an engineering review.
Use this calculation
Only calculator parameters and results are transferred. Personal details are collected separately in the destination form.
Formula
Qc = P[tan(cos⁻¹ PF₁) − tan(cos⁻¹ PF₂)]
Approximate tuning frequency: ft = f₁ / √p
Worked example
100 kW corrected from PF 0.75 to 0.95.
Expected check: Required compensation = 55.32.
Assumptions
- • Present and target values are lagging displacement power factors
- • Target PF is entered by the user and defaults to 0.95, not 1.00
- • Active load remains constant
- • Balanced system for three-phase current
- • Candidate bank is rounded upward to a 5 kVAR preliminary screen
Limitations
- • Capacitor kVAR is preliminary
- • Advanced detuned-reactor output is screening only—not a harmonic-filter design
- • Final APFC design requires actual network and harmonic assessment where applicable
- • Capacitor, reactor, fuse, contactor and switching ratings require manufacturer data
Frequently asked questions
Can this result be used for final equipment selection?
No. Use it for a preliminary check, then verify manufacturer data, site conditions, applicable standards and the complete system design.
What does formula version 1.0.0 mean?
It identifies the exact calculation logic used so a saved result can be traced when the formula register changes.
Can Elexorn review my calculation?
Yes. Transfer the result to Request a Quote or Talk to an Elexorn Engineer and add the relevant project or equipment details.