In a Y-Y source/load configuration, how do phase current, line current, and load current relate to each other?

In a Y-Y source/load configuration, how do phase current, line current, and load current relate to each other?

• A. They are all equal in each phase
• B. Line current is greater than phase current
• C. Load current is half of phase current
• D. Load current is independent of phase current

Answer: (A)

In a Y-Y (star-star) source/load configuration, the relationship between phase current, line current, and load current is fundamental to understanding how three-phase electrical systems operate. In this configuration, the line current and the phase current are equivalent. When dealing with a star connection, each phase of the load or source is connected to a common neutral point. This means that the current flowing through each phase (phase current) is the same as the current flowing through the lines connected to those phases (line current). Therefore, in a balanced system where all three phases are identical, the phase current and line current match exactly; they are equal in magnitude. This equality results in consistent load behavior across all phases, providing stability and efficiency in power delivery. In practical terms, the current flowing through the load connected to each phase of the Y configuration corresponds directly to the line current measured at the terminals of the source. Thus, the assertion that they are all equal in each phase accurately reflects the characteristics of a Y-Y configuration, indicating the direct correspondence between line and phase currents in a balanced three-phase system.

In a Y-Y (star-star) source/load configuration, the relationship between phase current, line current, and load current is fundamental to understanding how three-phase electrical systems operate. In this configuration, the line current and the phase current are equivalent.

When dealing with a star connection, each phase of the load or source is connected to a common neutral point. This means that the current flowing through each phase (phase current) is the same as the current flowing through the lines connected to those phases (line current). Therefore, in a balanced system where all three phases are identical, the phase current and line current match exactly; they are equal in magnitude.

This equality results in consistent load behavior across all phases, providing stability and efficiency in power delivery. In practical terms, the current flowing through the load connected to each phase of the Y configuration corresponds directly to the line current measured at the terminals of the source.

Thus, the assertion that they are all equal in each phase accurately reflects the characteristics of a Y-Y configuration, indicating the direct correspondence between line and phase currents in a balanced three-phase system.