| Definition: | for a polyphase line mean value, taken over one period, of the instantaneous power
NOTE – For a three-phase line under symmetric and sinusoidal conditions, the active power is P =UIX cos φ , where U is the rms value of any line-to-line voltage, I is the rms value of any line current and φ is the displacement angle between any line-to-neutral voltage and the corresponding line current.
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