Consider the power system in Figure Q.3(a). Assumed that the power system is initially unloaded and generator G3 is taken as a base i.e. 500 MVA, 22 kV. If a three phase fault occurs at the Bus 2, by using the Thevenin method determine; (1) The fault current in Ampere and short circuit MVA. (ii) The current in all transmission lines during fault in Ampere. Bus 2 Line 2 Bus 3 T2 G2 Bus 1 G1 TI Line 1 X =j70 ohm 500 MVA 500/13.8 kV X =j0.15 p.u 500 MVA 30 kV X=j0.10 p.u X-j80 ohm 500 MVA 13.8 kV X=j0.14 p.u 500 MVA 30/500 kV X=j0.18 p.u Line 3 Bus 4 T3 G3 Figure Q3(a) X =j60 ohm 500 MVA 500/22 kV X=j0.16 p.u 500 MVA 22 kV X=j0.12 p.u (14 marks) (3 marks)