What is the phase difference between the line voltage and phase voltage in a star-connected load?
0°
In a star-connected load, the phase voltage is the voltage between one line and the neutral point, while the line voltage is the voltage between any two lines. The relationship between the line voltage \(V_L\) and phase voltage \(V_P\) in a star connection is given by:
\(V_L = \sqrt{3} V_P\)
However, this equation describes the *magnitude* relationship. The question asks about the *phase difference*. In a balanced star connection, the phase voltages are 120° apart from each other. Crucially, the line voltage is the vector difference between two phase voltages. Because of the symmetrical nature of a balanced three-phase system, this vector difference results in a 0° phase difference between the line voltage and the phase voltage in a specific phase.
Therefore, the correct answer is 0°.
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