Siemens DTU3005-B Especificaciones descargar pdf (Pagina 31)

Power factor can be given as a percent or in decimal format. The

following table shows the power factor for a few sample angles.

In purely resistive circuits, apparent power and true power are

equal. All the power supplied to a circuit is consumed or

dissipated in heat. The angle of theta is 0° and the power factor

is equal to 1. This is also referred to as unity power factor. In

purely reactive circuits, apparent power and reactive power are

equal. All power supplied to a circuit is returned to the system.

The angle theta is 90° and the power factor is 0. In reality, all AC

circuits contain some amount of resistance and reactance. In a

circuit where reactive power and true power are equal, for

example, the angle of theta is 45° and power factor is 0.70.

Angle

Theta

Cosine of

Angle

Theta

Power

Factor (%)

Power

Factor

(Decimal)

0 1 100% 1

10 0.98 98% .98

20 0.94 94% .94

30 0.87 87% .87

45 0.70 70% .7

60 0.50 50% .5

70 0.34 34% .34

80 0.17 17% .17

90 0 0% 0

1 2 ... 26 27 28 29 30 31 32 33 34 35 36 ... 87 88

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Siemens DTU3005-B Especificaciones Pagina 31