hw6_solution

hw6_solution - matrix relationships 5 Apply A...

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EE 459 HW SET #6 (Due on Monday, April 24) Chapter 12: (Summary questions for insights) Q1: a) What is a fault analysis problem? Why is it important? What current is the problem solving for? Why? b) Give the procedures to solve such a problem. Answer: a) Please refer to the lecture notes March 22, p12, p23 (sub- transient current) for the worst case study. b) procedures: 1) Find positive, negative and zero sequence Y matrices and Z matrices. 2) Find the corresponding Thevenin’s equivalents from the fault location 3) Connect the Thevenin’s equivalents according to the fault type and solve for the fault currents. 4) Find the impacts of the fault currents to voltages through impedance
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Unformatted text preview: matrix relationships. 5) Apply A transformation to obtain needed phasor voltages and currents. 6) Obtain the needed MVA for the breakers. Q2: a) What is a lightning (surge) arrester? b) How does it protect power systems? Answer: P6 and P11 of lecture notes on March 12. Lighting arresters provide lightning short path around equipment during lightning strikes so that the lightning will not strike the apparatus directly; during the conduction period, they also dissipate/store the lightning energy so that the energy will not harm the equipment. Chapter 12: (Calculations for insights) 12.3, 12.4, 12.5, 12.6, 12.9, 12.10, 12.14....
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hw6_solution - matrix relationships 5 Apply A...

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