4. Three-Phase AC Power

The input power to a 3-phase AC motor was measured as P = 5kW (the true or active

power). If the voltage and current to the motor are 400Volts and 8.6Amp, respectively,

calculate:

A. the Power Factor of the system, pf

B. Reactive Power (Q) in kVAR and

C. Apparent Power (S) in kVA.

D. the motor efficiency, if the motor output power is 7.5Hp

Star & Delta Three-Phase Connections

Star

connection V

13- Vp

Delta

connection:

Iv

[5pts]

[5pts]

[5pts]

[5pts]

13 p

Vp