Keywords:
Balanced Three-Phase
Power
Problem #2
A balanced three-phase-Wye-connected load requires 270 W at a lagging power factor of 0.9. The load is fed by an ideal three-phase generator through a line having an impedance of 0.5+j1 Ω. The line voltage at the terminals of the load is 200 V. Calculate the complex power delivered by the generator.
Need a hint?
Construct a single phase equivalent circuit. Find the complex power for the load and the line separately. The power per phase is the sum of the load power and the line power. The total complex power delivered by the generator is three times of the single phase power.