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ELEC5203_Tutorial_2 - School of Electrical Information...

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________________________________________________________________________________________________________ VGA, The University of Sydney 24 March 2009 Page 1 of 2 School of Electrical & Information Engineering E LEC 5203 Topics in Power Engineering 1 st Semester 2009 Tutorial Questions Set 2 ____________________________________ Question 1 A balanced three-phase wye-connected load is connected to a balanced three- phase wye-connected supply source. The impedance in each phase of wye-connected load is 25 30 ° Ω and the line-to-line voltage at load terminal is 4.16 kV. The impedance in each of the three lines connecting the load and supply source is 1.6 65 ° Ω . Using phase voltage an V as a reference, find the line-to-line voltages at the supply source and also find the line-to-line voltages at source in per unit values using the line-to-line voltage at load terminal and line current as base values Question 2 The Thevenin equivalent circuit model of a single-phase power system is shown in Figure 1. The open-circuit voltage is S V and short-circuit impedance is 0.1 S Z j = Ω .
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