Figure. 5.2.3 - 75. Three-phase active power (P) calculation.
In these equations, phi (φ) is the angle difference between voltage and current.
Figure. 5.2.3 - 76. Three-phase reactive power (Q) calculation.
Active power can be to the forward or the reverse direction. The direction of active power can be
indicated with the power factor (Cos (φ), or Cosine phi), which is calculated according the following
formula:
The direction of reactive power is divided into four quadrants. Reactive power may be inductive or
capacitive on both forward and reverse directions. Reactive power quadrant can be indicated with Tan
(φ) (tangent phi), which is calculated according the following formula:
Power factor calculation is done similarly to the Cosine phi calculation but the polarity is defined by the
reactive power direction. Therefore, the power factor is calculated with the following formula:
A
AQ
Q-T215
-T215
Instruction manual
Version: 2.04
79