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

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A 11kV/400V, 1500 kVA distribution transformer has a per-unit impedance of Z_pu = 0.05 (5%) on its rating base. Assuming an infinite 11kV busbar upstream, what is the prospective three-phase symmetrical short-circuit fault current (I_sc) at the LV secondary busbars?

43.30 kA 2.165 kA 25.00 kA 75.00 kA

Correct Answer:

43.30 kA

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