1. Consider the system shown in the single-line diagram of Figure 7.54. All reactances are shown in per unit to the same base. It is required to find the fault current due to a bolted-three-phase short circuit at bus 4.
![1615_9214bfc2-ee21-4927-9eef-4b7aadfd88ab.png](https://secure.tutorsglobe.com/CMSImages/1615_9214bfc2-ee21-4927-9eef-4b7aadfd88ab.png)
2. For the system of Figure 7.54
A. Find the fault current due to a bolted-three-phase short circuit in the middle of line 1-3.
B. Find the voltages at buses 1 and 2 under the fault conditions of part A above.