In a Y-connected 3-phase system, the relationship between line and phase currents is described how?

In a Y-connected (or star-connected) 3-phase system, the fundamental relationship between line currents and phase currents is that the line current is equal to the phase current. This relationship arises from the way the connections are configured.

In a Y-connected system, each phase winding is connected to a common neutral point. The line current flowing in each of the three lines equals the current flowing through the respective phase winding. Because there are no additional transformations or factors at play, the current that enters or exits the line is precisely the same as the current flowing through that phase, thus establishing them as equal.

Understanding this equality is crucial in analyzing and designing Y-connected circuits, as it helps one to effectively calculate total current and manage power flow across the system. This foundational concept also differentiates Y connections from delta connections, where the relationships between line and phase currents differ.