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Electrical Electronics Projects
POWER SYSTEM
Three Phase System Advantages over Single Phase System
BY ADMIN · MAY 24, 2016
Three Phase System Advantages
In polyphase AC system it is possible to use two , three or more individual circuits, operate at same frequency, their voltages and currents are out of phase from one another.
Single phase system has its own limitations and has been replaced by three-phase system.
Advantages of three-phase system over single phase systems
The advantages of polyphase system over single phase systems are given below:
Power delivered is constant. In single phase circuit the power delivered is pulsating and objectionable for many applications.
For a given frame size a polyphase machine gives a higher output than a single phase machine.
Polyphase induction motors are self starting and are more efficient. Single phase motor has no starting torque and requires an auxiliary means for starting.
Comparing with single phase motor, three phase induction motor has higher power factor and efficiency.
Three phase motors are very robust, relatively cheap, generally smaller, have self-starting properties, provide a steadier output and require little maintenance compared with single phase motors.