One technique for limiting fault current is to place reactance in series with the generators. Such reactance can be modeled in Simulator by increasing the value of the generator's positive sequence internal impedance. For the Problem 7.24 case, how much per-unit reactance must be added to \(\mathrm{G} 3\) to limit its maximum fault current to 2.5 per unit for all 3 phase bus faults? Where is the location of the most severe bus fault?

Data From Problem 7.24:-

PowerWorld Simulator case Problem 7.24 models the system shown in Figure 7.14 with all data on a 1000-MVA base. Using PowerWorld Simulator, determine the current supplied by each generator and the per-unit bus voltage magnitudes at each bus for a fault at bus 2 .

FIGURE 7.14 G1 T1 T3 150 150 Problems 7.12, 7.13, 7.19, 7.24, 7.25, 7.26 YA YA j50 n t G2 122 3