In a three-phase transformer, how many degrees is each phase displaced?

• A. 30°
• B. 90°
• C. 120°
• D. 180°

Answer: (C)

In a three-phase transformer system, each phase is displaced by 120 degrees from the others. This configuration is fundamental to three-phase power systems and allows for a more balanced load across the three phases. By having the phases spaced evenly apart at 120 degrees, the system can provide a continuous power flow and minimize the fluctuations that might occur in single-phase systems.

This 120-degree displacement is essential for the operation of three-phase motors and generators, as it ensures that the magnetic fields produced by each phase complement each other, leading to stable and efficient operation. This design contributes to the efficiency of power transmission and helps in reducing losses, making three-phase systems more efficient for industrial and commercial applications. The 120-degree phase shift is a standardized measurement critical in electrical engineering and equipment design.