ProblemSet9

# ProblemSet9 - 9-6(Keyhani Lecture Consider the following...

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1 Problem Set #9 Unsymmetrical faults 9-1 (Grainger and Stevenson, Jr. Chapter 12, Prob. 12.1) 9-2 (Grainger and Stevenson, Jr. Chapter 12, Prob. 12.3) 9-3 (Grainger and Stevenson, Jr. Chapter 12, Prob. 12.4) 9-4 (Grainger and Stevenson, Jr. Chapter 12, Prob. 12.8) 9-5 (Keyhani Lecture) Consider the power system given below:

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2 Given: Z G(1) = Z G(2) = j 0.10 p.u., Z G(0) = j 0.05 p.u. Z AB(1) = Z AB(2) = j 0.2 p.u., Z AB(0) = j 0.4 p.u. Z BC(1) = Z BC(2) = j 0.20 p.u., Z BC(0) = j 0.4 p.u. Z T(1) = Z T(2) = Z T(0) = j 0.05 p.u. V L = 0.9 -4.0 ° p.u., S L = 1+ j 0.5 p.u. For a single line to ground fault at Bus B, compute the following: 1) The fault currents flowing from Bus A and Bus C to Bus B (faulted bus) when the load is ignored. 2) The same as part (1), but take the load into consideration. 3) The same as part (1), but assume the generator is not grounded.
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Unformatted text preview: 9-6 (Keyhani Lecture) Consider the following system. Derive Thevenin equivalent sequence networks looking at Bus 1. Item MVA Rating Voltage Rating X 1 X 2 X G1 100 25 kV 0.2 0.2 0.05 G2 100 13.8 kV 0.2 0.2 0.05 T1 100 25/230 kV 0.05 0.05 0.05 T2 100 13.8/230 kV 0.05 0.05 0.05 Line12 100 230 kV 0.1 0.1 0.3 Line13 100 230 kV 0.1 0.1 0.3 Line23 100 230 kV 0.1 0.1 0.3 a) Draw the sequence networks. b) Reduce the networks in (a) to their Thevenin equivalents “looking in” at Bus 1. 9-7 (Keyhani Lecture) For a 3 φ fault at Bus “1” in Problem 9-6, calculate the fault phase voltages and currents. 9-8 (Keyhani Lecture) Repeat Problem 9-7 for a single phase line to ground fault....
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ProblemSet9 - 9-6(Keyhani Lecture Consider the following...

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