The system which uses three wires for generation, transmission, and distribution is known as the three-phase system. The sum of the line currents in the 3-phase system is equal to zero, and their phases are differentiated at an angle of 120ยบ. This system delivers 3x power compared to a single-phase supply. It is mainly used to run industrial loads like induction motors.
The three-phase system has four-wire, i.e., the three current-carrying conductors and the one neutral. The cross-section area of the neutral conductor is half of the live wire. The current in the neutral wire is equal to the sum of the line current of the three wires and consequently equal to √3 times the zero phase sequence components of current.
The three-phase system induces in the generator which gives the three-phase voltage of equal magnitude and frequency. It provides an uninterruptible power, if one phase of the system is disturbed, then the remaining two phases of the system continue to supply the power. The magnitude of the current in one phase is equal to the sum of the current in the other two phases of the system.
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