Define phase sequence.

Define phase sequence.

• A. The timing of power factor corrections
• B. The pattern the conductors must connect in the same way throughout the system for proper rotation
• C. The order of breaker trips
• D. The synchronization of generator outputs

Answer: (B)

Phase sequence is the order in which the three-phase voltages reach their peak values, i.e., the order of the phases around the system. This order sets the direction of the rotating magnetic field produced by the three windings. When the conductors are connected so that the phases follow the same sequence throughout the system, the magnetic field rotates in the intended direction, allowing motors and equipment to operate correctly. If the sequence is reversed, the rotation direction would flip, which can cause reverse torque, mechanical stress, and overheating. The other options refer to different topics: timing of power factor corrections is about reactive power management, the order of breaker trips concerns protection sequencing, and synchronization of generator outputs deals with matching voltage, frequency, and phase before paralleling generators.

Phase sequence is the order in which the three-phase voltages reach their peak values, i.e., the order of the phases around the system. This order sets the direction of the rotating magnetic field produced by the three windings. When the conductors are connected so that the phases follow the same sequence throughout the system, the magnetic field rotates in the intended direction, allowing motors and equipment to operate correctly. If the sequence is reversed, the rotation direction would flip, which can cause reverse torque, mechanical stress, and overheating. The other options refer to different topics: timing of power factor corrections is about reactive power management, the order of breaker trips concerns protection sequencing, and synchronization of generator outputs deals with matching voltage, frequency, and phase before paralleling generators.