Polyphase AC Circuits

(1) Balanced star load:

Line voltage = √3 phase voltage
Line current = phase current

Power Relations:
Apparant Power: S = √3 $V_L I_L$ VA or kVA
Active Power: P = √3 $V_L I_L$ cosϕ watt
Reactive Power: Q = √3 $V_L I_L$ sinϕ kVAR

(2) Balanced delta load:

Line voltage = phase voltage
Line current = √3 Phase current

Power formulae are same as that of star load