What is one purpose of determining the phase sequence in a three-phase system?

Determining the phase sequence in a three-phase system is essential because it directly affects the direction of rotation of polyphase motors. The phase sequence refers to the order in which the phases reach their maximum positive value and is crucial for the proper functioning of three-phase machinery. If the phase sequence is incorrect, it can cause motors to run in the opposite direction, which can lead to mechanical issues or failure of the equipment. Therefore, verifying and maintaining the correct phase sequence ensures that motors and other equipment function as intended, enhancing operational efficiency and safety.

While other options like measuring total power consumption, identifying faults in the system, and calculating voltage drops are important aspects of electrical systems, they do not specifically relate to the effects of phase sequence on motor rotation. Information about phase sequence is primarily concerned with motor operation, making it a critical factor in ensuring correct performance.