Kostenloser Capacitor Bank Rechner
Berechnen Sie required capacitor bank kVAR to improve power factor. Geben Sie existing und target PF mit real power.
Required Capacitor Bank
110.6 kVAR
Required Capacitor Bank vs Real Power (P)
Formel
## Power Factor Correction with Capacitors Capacitor banks supply reactive power locally, reducing the reactive current drawn from the supply. ### Formula **Q_c = P (tan(phi_1) - tan(phi_2))** where P is real power, phi_1 = arccos(PF_old), phi_2 = arccos(PF_new). Equivalently: tan(phi) = sqrt(1/PF^2 - 1).
Lösungsbeispiel
Improve power factor from 0.75 to 0.95 on a 200 kW load.
- 01tan(phi_1) = sqrt(1/0.75^2 - 1) = sqrt(0.778) = 0.882
- 02tan(phi_2) = sqrt(1/0.95^2 - 1) = sqrt(0.108) = 0.329
- 03Q_c = 200 x (0.882 - 0.329) = 200 x 0.553 = 110.6 kVAR
- 04Select 120 kVAR capacitor bank (next standard size).
Häufig Gestellte Fragen
Should I correct to unity power factor?
Generally no. Correcting to exactly 1.0 is expensive and can cause leading power factor during light load conditions, which may create voltage rise issues. Target 0.92-0.97 for best economics.
What types of capacitor banks are available?
Fixed banks provide constant correction. Automatic (switched) banks use a controller to switch capacitor stages in and out as load varies. Automatic banks are preferred for varying loads to avoid over-correction.
Can capacitors cause harmonic problems?
Yes. Capacitors can resonate with system inductance at harmonic frequencies, amplifying harmonics. In systems with significant harmonic content (VFDs, rectifiers), use detuned capacitor banks with series reactors.
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