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O_MidTermI

# O_MidTermI - Using 138kV as the base voltage for Bus 2 and...

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The Ohio State University Department of Electrical and Computer Engineering ECE 740  Autumn 2007  Mid Term - I (Optional) November 20, 2007 Name (print) ____________________________________________                                          Notice:  There are 3 problems on the following pages.   Please read the problems carefully. Draw diagrams wherever necessary and show all the steps.  “No aid is given, received or observed”            Signature_____________  Grade____________ _ 1

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Problem # 1: (40 points) A 6-bus power system is shown below –   Generator G1: 50 MVA, 18kV, X d ”=6% Generator G2: 25 MVA, 20kV, X d ”=8% Synchronous Motor M: 50 MVA, 13.8kV, X d ”=5% Transformer T1: 100 MVA, 20kV/138kV, 10% Transformer T2: 25 MVA, 138kV/18kV, 5% Transformer T3: 50 MVA, 138kV/15 kV, 8%

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Unformatted text preview: Using 138kV as the base voltage for Bus 2 and 100 MVA the base MVA value for the entire system, determine per-unit circuit of the system. 2 3 Problem # 2: (20 points) Consider the three-phase system as shown below. 4 Generator G1: X d ”=10% Generator G2: X d ”=4% Synchronous Motor M: X d ”=5% All line impedances given in above figure are in p.u. Find the Y-bus matrix for – a) Power flow study b) Short circuit study. Problem # 3: (40 points) A 2-bus power system is shown below: 5 Generator: G1: X d ”=20% G2: X d ”=10% If Bus 1 is accidently short-circuited to ground, find the short-circuit current at bus 1. Assume both generators are at their rated voltages before short circuit occurs. 6 7...
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O_MidTermI - Using 138kV as the base voltage for Bus 2 and...

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