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Power Factor Correction & Capacitor Sizing

Calculate required kVAR capacitor bank and microfarads (µF) to avoid utility penalties

AC Power Triangle & Power Factor Correction Sizer

Computes Active (kW), Reactive (kVAR), Apparent (kVA), and calculates capacitor bank size to reach target PF

Industrial & Commercial Load Presets

Interactive AC Power Triangle & Correction Vector Diagram

Initial PF = 0.769 → Target PF = 0.95
Active Power P = 50 kW (Work Done)Q₁ = 41.53 kVARS₁ = 65 kVA↓ Q_C = 25.1 kVAR (Capacitor Bank)S₂ = 52.63 kVAθ = 39.7°
PF = P / S = 50 kW / 65 kVA = 0.769 (θ = 39.7°)
Q_C = P · (tan θ₁ - tan θ₂) = 50 · (0.831 - 0.329) = 25.1 kVAR
Power Factor (cos θ)
0.769
θ = 39.7° lag
Reactive Power (Q)
41.53 kVAR
Inductive load component
Capacitor Bank Size
25.1 kVAR
166.4 μF per phase
Released Capacity
12.37 kVA
Freed electrical headroom

About Power Factor Correction & Capacitor Sizing

Determine the exact capacitor bank size (kVAR and µF) required to correct lagging industrial power factors to utility compliance targets (e.g. 0.95+). Calculate line current reduction, conductor thermal relief, and annual utility surcharge savings.

Key Capabilities & Features

  • Calculates required kVAR reactive reduction to reach target power factor
  • Computes required capacitance in Microfarads (µF) at specified operating voltage and frequency
  • Estimates line current reduction (Amperes) to decrease cable thermal losses
  • Estimates annual utility low-PF penalty cost savings
  • Visual breakdown of initial versus corrected reactive demand

How to Use Power Factor Correction & Capacitor Sizing

1

Enter Facility Load (kW)

Specify total active real power consumed by plant inductive equipment.

2

Set Initial and Target PF

Input your measured power factor (e.g. 0.72) and desired target (e.g. 0.95).

3

Review Sizing Requirements

View the required kVAR rating and microfarad capacitance for your capacitor bank.

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Frequently Asked Questions

Why do electric utilities penalize low power factor?

A low power factor draws excess reactive current through grid transmission lines, forcing utilities to install larger generators, transformers, and conductors while suffering higher line transmission losses.

Can power factor be overcorrected?

Yes. Adding excessive capacitance can push the power factor into a leading state, potentially causing voltage resonance, harmonics, and elevated line voltages that damage electronics.