Which of the following statements is true regarding phase currents in Y-connected systems?

In a Y-connected (or star-connected) system, the relationship between line currents and phase currents is a fundamental concept that is essential for understanding the operation of three-phase electrical systems. In such a configuration, each line current is equal to its corresponding phase current. This means that for each phase of the system, the current flowing through the line (which connects to the external circuit) is the same as the current flowing through the respective phase winding.

In more detail, in a Y connection, there are multiple branches (phases) connected to a common neutral point. Each of these branches carries the “phase current.” The conductors that carry the current from the power source to the load are called line conductors, and the current in these conductors is referred to as the “line current.” In a balanced system, the line current can be described mathematically as equal to the phase current.

Therefore, this fundamental equality highlights the relationship in that, for Y-connected systems, the individual phase currents are indeed equal to the corresponding line currents, reflecting the underlying principle of how current flows in such circuits. This understanding is crucial for anyone working with three-phase systems to ensure proper analysis and equipment design.