Advantages of three phase systems

  • Three phase motors for a given horsepower are smaller in physical size compared to single phase.
  • Smaller conductors are required to carry the same amount of power compared to single phase.
  • Three phase motors are self-starting while single phase motors require an auxiliary start winding.
  • Three phase motors have better power factor compared to single phase motor.
  • Rectified Three phase signal gives less ripple factor compared single phase rectifier.
  • Requires less copper compared to single phase to transmit the same power.
  • High efficiency compared to single phase motor.