DOCA0257EN-00

Power Factor

Description

The power factor displays the phase displacement between phase currents and phase voltages.

The power factor (also called cosine phi or cos ϕ or cos φ) represents the absolute value of the ratio of active power to apparent power.

The following diagram displays an example of the average RMS current sinusoidal curve lagging slightly behind the average RMS voltage sinusoidal curve, and the phase angle difference between the two curves:

After the phase angle (ϕ) is measured, the power factor can be calculated as the cosine of the phase angle (ϕ)-the ratio of side a (active power) over the hypotenuse h (apparent power):

Characteristics

The power factor has the following characteristics:

Characteristic Value

Power factor range

0.40–1.00

Accuracy

+/- 10% for cos ϕ ≥ 0.6

Resolution

0.01

Refresh interval

100 ms

QR Code is a registered trademark of DENSO WAVE INCORPORATED in Japan and other countries.

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