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Power Factor Correction Calculator

Power Factor Correction Calculator supports engineering calculations with transparent assumptions, practical result interpretation, and links to next-step technical resources.

PF Correction Visualizer

Formula

Qbefore = P × tan(arccos(PFbefore))

Qafter = P × tan(arccos(PFtarget))

Qc = Qbefore - Qafter

S = P / PF, I = P / (V × PF)

Capacitor estimate assumes fundamental-frequency kvar correction. Harmonics and detuning requirements should be checked before final capacitor bank specification.

Power Triangle (Before vs After)

Enter valid values to render compensation triangle.

Line Current vs Power Factor

Enter valid values to render dynamic current reduction curve.

Inputs & Outputs

Real Power (P)

Line-to-Line Voltage

Existing PF

Target PF

Frequency (Hz)

Capacitor Bank Connection

Apparent power before—

Apparent power target—

Reactive power before—

Reactive power target—

Required capacitor compensation—

Line current before—

Line current target—

Current reduction—

Capacitance requirement—

Capacitance output appears after valid input.

Awaiting valid inputs

PF Correction Fundamentals

Power factor correction reduces reactive current by injecting capacitive kvar. This can lower line current, reduce losses, and improve available system capacity.

Electrical Effect

Real power remains the same while reactive demand decreases.

Lower reactive demand shifts PF up and line current down.

Design Consideration

Correction should avoid overcompensation and leading PF at light load.

Switching steps and harmonic conditions should be validated in final design.

Equation Reference

Core equations used for capacitor correction sizing and current improvement estimation.

Topic	Equation	Meaning
Reactive power before correction	Q1 = P × tan(arccos(PF1))	Existing reactive demand of the load at the current power factor.
Reactive power after correction	Q2 = P × tan(arccos(PF2))	Reactive demand corresponding to the target power factor.
Required capacitor kvar	Qc = Q1 − Q2	Capacitor bank rating needed to shift PF from existing to target.
Current improvement	I = P / (V × PF) or P / (√3 × VLL × PF)	Higher PF reduces line current for the same real power transfer.

Application Workflow Matrix

Map correction results to commissioning, capacity, and energy optimization workflows.

Scenario	Objective	Recommendation	Critical Checks
Main incomer PF improvement	Reduce feeder current and release transformer/line capacity	Use measured average real power and realistic PF baseline; size capacitor kvar to target PF with a margin against overcorrection.	Load profile variation, harmonics, staged switching strategy
Motor-heavy production line	Stabilize PF under inductive operating conditions	Estimate correction at typical duty load rather than idle condition to avoid leading PF during light operation.	Intermittent loads, VFD front-end behavior, capacitor contactor cycling
Energy cost optimization study	Quantify technical gains before capacitor bank investment	Compare pre/post current and apparent power to estimate network loading relief and likely billing impact.	Utility tariff terms, minimum PF clauses, maintenance lifecycle cost