Why Three Phase? •Almost all electric power generation and most of the power transmission in the world is in the form of 3-phase AC circuits. A 3-phase AC system consists of three-phase generators, transmission lines and loads. •Two major advantages of 3-phase systems: •More power per kilogram of metal from a three-phase machine •Power delivered to a 3-phase load is constant at all time, instead of pulsing as it does in a single-phase system
Generation of 3-phase voltages and currents 𝑉𝑉𝑎𝑎=𝑉𝑉∠0°𝑉𝑉𝑏𝑏=𝑉𝑉∠ − 120°𝑉𝑉𝑐𝑐=𝑉𝑉∠ − 240°•A three-phase generator consists of three single-phase generators with voltages of equal amplitudes and phase differences of 120°.
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