HKIE Professional Assessment - Electrical Discipline Practice Questions - HKIE Professional Assessment - Electrical Discipline (Hong Kong Institution Of Engineers) Exam

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In a balanced three-phase star-connected low voltage AC system in Hong Kong (400V line-to-line), what is the relationship between the line voltage (V_L) and the phase voltage (V_ph)?

V_L = sqrt(3) * V_ph, with line voltage leading phase voltage by 30 degrees V_L = V_ph / sqrt(3), with line voltage lagging phase voltage by 30 degrees V_L = 3 * V_ph, with line voltage in phase with phase voltage V_L = V_ph, with line voltage leading phase voltage by 90 degrees

Correct Answer:

V_L = sqrt(3) * V_ph, with line voltage leading phase voltage by 30 degrees

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