NETA ETT Level 4 Practice Questions - NETA ETT Level 4 Senior Certified Electrical Testing Technician Exam

A short-circuit study input 'available utility fault MVA' at a substation bus is converted to per-unit impedance by:

Z(pu) = MVA(base) / MVA(sc) — the utility source impedance in per-unit on the study base Z(pu) = MVA(sc) / MVA(base) Z(pu) = MVA(sc) * MVA(base) Z(pu) = 1 / MVA(sc)

Correct Answer:

Z(pu) = MVA(base) / MVA(sc) — the utility source impedance in per-unit on the study base

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