Powers in three-phase systems with neutral conductor at sinusoidal voltages and currents

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Most of residential and industrial distribution systems as well as traction and distribution systems in commercial buildings are three-phase systems with a neutral conductor, denoted in this paper as 3pN systems. When loads are unbalanced then such systems cannot be now described as a whole in power terms because of a controversy regarding definition of the apparent, even if voltages and currents are sinusoidal. Consequently, it is not clear now how the apparent power and the power factor are affected by the load imbalance. The paper suggests definition of the apparent power for such systems and the power equation. It is based on the supply current decomposition into the Currents' Physical Components (CPC). The paper introduces two new powers that specify the effect of the load imbalance upon the apparent power of three-phase systems with a neutral conductor at sinusoidal voltages and currents.

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Przeglad Elektrotechniczny

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