EEC 420 Power System Analysis Exam 2022

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EEC 420: A 2-page Second Semester Examination for Power Systems Analysis (EEC420), University of Buea College of Technology, instructors T. A. Mih / A. C. Tange, dated Thursday 16/06/2022, Academic Year 2021/2022, credit value 4, time allowed 2 hours. Section A (answer question 3 and one other, 40 marks): sending-end current/voltage, power loss and transmission efficiency of a 150 km nominal-pi transmission line feeding a 50 MVA load at 0.866 pf lagging, 138 kV; a single-phase 200 MVA transformer's equivalent-circuit parameters from open- and short-circuit test data, expressed in per-unit; two Newton-Raphson power-flow iterations for a generator-load bus pair, plus two Gauss-Seidel iterations on a given transcendental equation. Section B (answer all, 30 marks): zero/positive/negative sequence network diagrams and source voltages for an unbalanced delta-plus-grounded-wye load, the zero-sequence impedance and current and complex power delivered; and bolted single-line-to-ground fault analysis (fault current, bus 1 and bus 2 sequence voltages) using given bus impedance matrices, plus a true/false bonus on sequence components of balanced systems.