Power Systems — Distribution

Three-phase power

Three sine waves, 120° apart: their power sum is constant (no flicker), conductors share return paths (less copper), and motors start themselves. The bookkeeping: P = √3·V_LL·I·PF:

V_{LL} := 480 V

= 480 V line-to-line, industrial standard

I_{line} := 65 A

= 65 A

PF = 0.88

S_{3ph} = \sqrt{3} \cdot V_{LL} \cdot I_{line}

= 54040 W apparent power (VA)

P_{3ph} = S_{3ph} \cdot PF

= 47555 W real power doing work (W)