Problem 4 The Thevenin equivalent of each sequence network as viewed from the faulted bus q of the power system shown in Figure 4 are given with Z₁j0.14 pu, Z2j0.15 pu, Zoj0.15 pu and E₁ = 120° pu. Reactances are marked on the diagram in pu. 1. Draw the equivalent sequence networks and compute the fault currents and voltages for the following faults occurring at the faulted bus q for: (a) Balanced three-phase fault (b) Single line-to-ground fault (c) Line-line fault (d) Double line-to-ground fault 2. What is the worst fault from the viewpoint of the fault current? G1 x=j0.16 X2 = j0.17 р A/1 Xo j0.06 x₁ = x2 = x0 =j0.10 X₁ = x2 =j0.11 Xo =j0.33 १ X1 X2 X0j0.10 G2Y x₁ = j0.2 X2 = j0.22 Xo=j0.15 Y/A Figure 4.