The direct-axis subtransient reactances of the synchronous generator and motor are given in the above. The conditions are assumed to be the same as those in Example 7.3. The fault impedance (Z) is 15.87+0j ohm. The generator is operating at rated MVA, 0.95 p.f. lagging and at 10% above rated voltage when a three-phase fault occurs at bus 1. Determine each three-phase fault current on each fault current. For example, a three-phase fault occurs at bus 1, the fault current from bus 1 to the ground. A three- phase fault occurs at bus 2, the fault current from bus 2 to the ground. Which the fault current is the largest? 25 MVA 13.0 kV X -10% G Bus 1 7 YA 30 MVA 13.4/69 kV 10% Bus 2 Line m 14002 Bus 3 T Bus 4 A4 20 MVA 66/13.2 kV 10% M % 15 MVA 13.0 kV Xml -15%