Student Number: 1700123 A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodalb)voltages throughout the network are of 1 p.u. and the impedance of the electricarc is neglected. Sequence impedance parameters of the generator,transmission lines, and transformer are given in Figure Q3, where X and Y arethe last two digits of your student number.jX2) = j0.2Y p.u. V=120° p.u.jX22) = j0.2Y p.u.jX2(0) = j0.3X p.u.%3DV == 1Z0° p.u.V, = 120° p.u.V3 = 120° p.u.jXa1) = j0.1Y p.u.jX«2) = j0.1Y p.u.jX a0) = j0.1X p.u.jX11(1) = j0.2 p.u.1 jXn2) = j0.2 p.u. 2 AjX1(0) = j0.25 p.u.3jXT(1) = j0.1X p.u. jXB1) = j0.1Y p.u.jXr2) = j0.1X p.u. jXB(2) = j0.1Y p.u.jXT0) = j0.1X p.u. jX3(0) = j0.15 p.u.%3D%3D%3D%3D%3DFigure Q3. Circuit for problem 3b).For example, if your student number is c1700123, then:jXa(1) = j0.13 p.u., jXa(2) = j0.13 p. u., and jXaco) = j0.12 p. u.(i) Assuming a balanced excitation, draw the positive, negative and zerosequence Thévenin equivalent circuits as seen from bus 4.(ii)Determine the positive sequence fault current for the case when a three-phase-to-ground fault occurs at bus 4 of the network.(iii) Determine the short-circuit fault current for the case when a one-phase-to-ground fault occurs at bus 4.(iv) Determine the short-circuit fault current for the case when a phase-to-phase fault occurs at bus 4.

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A fault occurs at bus 4 of the network shown in Figure Q3. Pre-fault nodal voltages throughout the network are of 1 p.u. and the impedance of the electric arc is neglected. Sequence impedance parameters of the generator, transmission lines, and transformer are given in Figure Q3, where X and Y are the last two digits of your student number.