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Define line voltage and line current in a three-phase circuit.

1 Answer

In a three-phase electrical circuit, line voltage and line current are fundamental electrical parameters used to describe the characteristics of the system. These terms are essential for understanding the behavior and power distribution in three-phase systems.

Line Voltage:
Line voltage refers to the voltage difference between any two phases in a three-phase circuit. In a balanced three-phase system, the line voltage is the voltage measured across two conductors (wires) that are part of different phases. Since there are three phases, there are three possible pairs of conductors, and each pair will have a specific line voltage.

In a symmetrical three-phase system, where all three phases are evenly balanced and equally spaced, the line voltage can be calculated as follows:

Line Voltage (V_Line) = Phase Voltage (V_Phase) × √3

Where:

Phase Voltage (V_Phase) is the voltage between a phase conductor and the neutral point (in a 4-wire system) or between two phases in a 3-wire system.
√3 is the square root of 3, approximately equal to 1.732.
Line Current:
Line current refers to the current flowing through each of the conductors (wires) in a three-phase circuit. Again, in a balanced three-phase system, the line current is the same for all three conductors, but each has a different phase.

In a balanced three-phase system, the line current can be calculated as follows:

Line Current (I_Line) = Total Phase Current (I_Phase)

Where:

Total Phase Current (I_Phase) is the current flowing through each individual phase conductor.
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