This paper advocates much needed definitions for the apparent power S and f o r the power factor PF, in unbalanced polyphase circuits with sinusoidal waveforms. It is proved that the definition S2 = (V: + + V:)(Z; + I : + 1:) has a definite physical meaning, lending itself to a convenient resolution in positive, negative and zero sequence, nonactive and active powers. Zt is suggested to represent the power factor with the help of the ratio P + / S , where P+ is the positive sequence active power.
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