Power factor measurement for rotating machines under system unbalance

Sequence powers are a form of electrical pollution for the vast majority of rotational loads, since these powers contribute to both line and machine losses. The negative sequence power resulting in counter-torque reduces useful work. Therefore, the negative sequence should be accounted for in the power factor calculations. In this paper, power factor is measured for a proposed power factor definition for treating unbalance under sinusoidal conditions. This is used to assess power quality at an industrial plant´s mains. In addition, this proposed sinusoidal definition is extended to assess power factor for three-phase machines operating under system unbalance