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# 5200_L14 - 1[20 pts A 50-MVA delta-wye transformer is rated...

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EE 5200 - Lecture 14 Wed Sep 29, 2010 Topics for Today : Announcements Matlab - now we are ready to begin using it. Office hrs: 2:05-2:55pm M,W,F Office: EERC 614. Phone: 906.487.2857 Recommended problems from Ch.3, solutions posted Next: Transmission Line Parameters, Chapters 4,5,6 Synchronous Machines - Chapter 3. Basic internal structure of machines, cylindrical vs. salient Field windings Calculation with Xd and Xq. Calculation Example(s) Concepts behind SYNCH exercise set. S-S behavior - Xd ; Dynamic behavior - Xd’ Short-circuit behavior - Xd”; s-s, transient, subtransient

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SYNCH Homework - Problem 1 Date Due: Friday Oct 1, 5pm

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Unformatted text preview: 1) [20 pts] A 50-MVA delta-wye transformer is rated 115-13.8-kV. It has standard phase shift of 30° (115-kV side leads 13.8-kV side by 30°). Its self-cooled short-circuit impedance is 0.005 + j0.045 p.u. on the base of the transformer. a) Convert the impedance to 100 MVA base for system calculations. b) Determine its per unit 2x2 admittance matrix values for i) pos and ii) neg sequence, being sure to include the effect of phase shift. c) Repeat b) for the situation where the transformer is to connect system buses having base voltages of 115 kV and 12.47-kV. Include phase shift and off-nominal turns ratio....
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• Fall '10
• Bonk
• Transmission line, transmission line parameters, standard phase shift, Include phase shift, self-cooled short-circuit impedance, 50-MVA delta-wye transformer

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5200_L14 - 1[20 pts A 50-MVA delta-wye transformer is rated...

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