On the definition of power factor and apparent power in unbalancedpolyphase circuits with sinusoidal voltage and currents |
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Authors: | Emanuel AE |
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Affiliation: | Worcester Polytech. Inst., MA; |
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Abstract: | Definition for the apparent power S and for the power factor PF in unbalanced polyphase circuits with sinusoidal waveforms are presented. It is proved that the definition S2=(Va2+V b2+Vc2) (I a2+Ib2+I c2) has a definite physical meaning, leading itself to a convenient resolution in positive, negative and zero sequence, nonactive and active power. It is suggested that the power factor be represented with the help of the ratio P+/ S, where P+ is the positive sequence active powers |
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