Keywords:
Balanced Three-Phase
Wye-Wye Connection
Problem #2
The phase voltage at the terminals of a balanced three-phase Y-Connected load is 200 V. Assume the phase sequence is positive and the internal impedance of the source is 1+j1 Ω per phase. For each phase, the load has an impedance of 100+j100 Ω and the line impedance is 2+j2 Ω. Find the internal phase-to-neutral voltages at the source.
Need a hint?
Construct the a-phase equivalent circuit for the system. For a-phase, write an equation to relate the load voltage to the source voltage and then solve for the source voltage. The b-phase voltage lags the a-phase voltage by 120° and the c-phase voltage leads the a-phase voltage by 120°.