Q1. Consider the single-line diagram of an unloaded three-phase power system shown below. The ratings are: G: 5 MVA, 600 V, Xd" = Xi = X2= 14 %, Xgo = 4%, Xo = 5% M1 and M2: 2.5 MVA, 800 V, Xd" = X1 = X2= 20 %, Xgo = 5% TR1 : 5 MVA, 600 V/34 kV, X = 10 % TR2: 5 MVA, 34 kV/800 V, X = 12 % Line: Zı= Z2=j8.49 ohm, Zo = j33.96 ohm 3 4 TR) TR2 MO Line my tö Дң YA (M2 a) Draw the positive-, negative- and zero-sequence networks in per-unit. Choose a base of 5 MVA and 600 V in the circuit of generator G. b) Find the Thevenin equivalents of sequence networks as seen from Bus 2. Draw them. c) Assume that the system is unloaded and all voltages throughout the system are 1.0 per- unit on bases chosen in part (a). If a three-phase short-circuit occurs at Bus 2 with a fault (are) resistance of 10 ohm, find: - the fault current (in phase a, in amperes, with the angle), - the fault current in phase a, in amperes, with the angle) flowing at the terminals of the generator for the given fault.