Quiz_3s - supplying to a balanced three-phase load rated 80...

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The Ohio State University Department of Electrical and Computer Engineering ECE 740  Autumn 2007 Quiz # 3: Solution Name (print) ____________________________________________                                          Notice:  There is one problem on the following pages.   Please read the problem carefully. Draw diagrams wherever necessary and show all the steps.  “No aid is given, received or observed”            Signature_____________ 1
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 Grade_____________ Problem # 1: (10 points) A three-phase transformer rated 150 MVA, 345 kV/20.5 kV and 10% short circuit reactance is 
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Unformatted text preview: supplying to a balanced three-phase load rated 80 MVA, 22.5 kV with p.f.= 0.9 (lagging). a) Draw per-unit equivalent circuit of the system. Select 100 MVA, 22.5 kV as the base at the load. (3 points) b) With the voltage at the primary side of the transformer is kept constant at 345 kV, the load is disconnected. Determine the voltage regulation at the load. (7 points) Solution: (selected at the load) , Per-unit Equivalent Circuit: 2 , , 3...
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Quiz_3s - supplying to a balanced three-phase load rated 80...

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