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ProblemSet5

# ProblemSet5 - Problem Set#5 YBUS and ZBUS models and power...

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1 Problem Set #5 Y BUS and Z BUS models and power flow basics 5-1 (Keyhani Lecture) The one-line diagram of an unloaded power system is shown below. Reactances of the two sections of transmission line are shown on the diagram. The generator and transformer ratings are as follows: a) Draw the per unit equivalent circuit with all reactances marked in per unit on your circuit. Choose MVA base of 100. b) Compute the Y BUS model of the system for short-circuit studies. c) Compute the short circuit current flowing through breaker A for a three-phase fault at point B. d) Compute the Y BUS model of the system for power flow studies. 5-2 (Keyhani Lecture) Consider a system with the one-line diagram shown below. The three-phase transformer nameplate ratings are listed. The transformer reactances are given in percent: 10% = 0.1 p.u. The transmission line and load impedances are in actual ohms. The generator terminal voltage (magnitude) is 13.2 kV (line-line). Find the generator current, the transmission-line current, the load current, the load voltage, and the power delivered to the load. Assume S b =10 MVA.

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