In a three-phase system, what is the phase difference between each phase?

In a three-phase system, each phase is separated by a phase difference of 120 degrees. This configuration is essential for the balanced operation of three-phase electrical systems, as it allows the currents and voltages to be evenly distributed.

The 120-degree separation means that, at any given point in time, one phase reaches its peak value while the others are at different points in their cycles. This results in a continuous power flow and minimizes the chances of fluctuations, which enhances the efficiency of power transmission. In practical applications, this phase arrangement helps in reducing the overall size of wiring and transformers needed for electrical distribution, thus optimizing performance and cost.

Having phases that are 90 degrees apart, 180 degrees, or 360 degrees does not lead to the same balanced characteristics vital for three-phase systems. The use of 120 degrees is specifically designed to ensure that the phases complement each other, making it a key aspect of three-phase electrical theory and practice.