Example 10.5 . In the five-bus system of Fig . 1 0.8 a line-end, short-circuit fault
occurs on Iine 1 - 2 , on the line side of the breaker at bus 2. Neglecting perfault currents and assuming rated system voltage at the fault point , calculate the subtransicnt current into the fault when only the ncar-end breaker at bus 2 opens.