Worked example
No result for these values. The message above the form says which field to change.
Capacitive kvar to add (ideal)
kvar
- Reactive power before correction (lagging)
- 225 kvar
- Reactive power after correction (lagging)
- kvar
- Apparent power before correction
- 375 kVA
- Apparent power after correction
- kVA
- Line current before correction, each line
- A
- Line current after correction, each line
- A
- Line-current reduction
- %
Balanced three-phase line current at 400 V. This arithmetic does not select or approve a capacitor bank; harmonic and resonance assessment is required.
Underlined figures are rounded. Select one to copy its full value.
Method and assumptions
Formula
Qc = P × [tan(cos⁻¹ PF₁) − tan(cos⁻¹ PF₂)]This calculation is for lagging displacement power factor and sinusoidal or fundamental-frequency quantities. It does not derive a capacitor construction, voltage rating or switching scheme.
Limits of this result
- Do not apply this displacement-power triangle to total power factor where harmonic distortion is material.
- Harmonic spectrum, resonance, detuning, capacitor voltage/current stress, switching transients, step size, duty cycle and utility limits require an engineering study.
- The entered voltage is used only to compare ideal line current before and after correction; it does not size a capacitor or protective device.
- This mode assumes an initially lagging load and a higher lagging target; leading-power-factor correction is outside scope.
Technical sources
Put the value to work
Read the related engineering guidance, or carry this task into System Builder to identify the signal path and EpiSensor products.