Advantages of employing THREE phase circuits

1. For a given size of machine 3 phase machines provides more Output compared to that of single phase machines.
2.The amount of copper required to transfer power is less in three phase circuit when compared to that of single circuit
3.Transmission of power using three phase has more efficiency compared to that of single phase
4.Three phase has good voltage regulation compared to single phase
5.For a given size of rating three phase machines are smaller in size compared to that of single phase
6.Three phase circuits can produce rotating magnetic field where as single phase cannot
7.Three phase motors are self starting,where as single phase motors are not self starting
8.Three phase motors have less pulses where as single phase motors have more pulses,So the torque produced by three phase is uniform torque and the torque produced by single phase is uniform torque
9.The equipment of three phase has less losses when compared to that of single phase
10.If Six or twelve phase supply is provided to the rectifier then the output has less ripples