Consider the following five-bus power system (A-Y phase shifts are negligible. Prefault voltage is 1.08 per unin Figure 2: A five-bus power system. Gener- G1: 100 MVA, 10 kV, X1 : P.u., Xo MVA, 15 kV, X = X2 = 0.2 p.u., Xo = 0.1 P.u. // Transformer T1: 100 MVA, 10 kV/138 kV, X 3 ator # X2 = 0.2 0.1 p.u. // Generator G2: 100 %3D %3D G1 %3D T2 5. 0.1 p.u. // Transformer T2: 100 G2 %3D MVA, 15 kV/138 kV, X = 0.1 p.u. // Each 138 kV line: X = X2 = 40 0, Xo = 100 O. %3D %3D %3D (a) (4 points) Draw the zero-, positive-, and negative-sequence reactance diagrams for the system using a 100MVA, 15kV base in the zone of generator G1. (b) (2 points) For a fault at Bus 3, determine the Thvenin equivalent of each sequence network as viewed from the fault bus. (c) (4 points) Determine the fault current in per unit and actual units during a bolted single-line-to-ground fault at Bus 3.