PPT Slide

Section 11.1: Three-Phase Systems

Balanced set of 3 voltages, i.e.; Vaa’(t) + Vbb’(t) + Vcc’(t) = 0, where:

Vaa’(t) = Vmsin(w t)

Vbb’(t) = Vmsin(w t - 120°)

Vcc’(t) = Vmsin(w t - 240°)

Note the positive (phase) sequence (abc) of the voltage maxima

Voltage Phasors