PV Generating Station DC Bus AC Bus DC/AC Inverter T1 440 V/3.2 kV 500 kVA 3.5% Ztrins PROBLEMS 171 Local Loads 250 kVA Local Power BE Grid 3.2 kV 13.2 kV T2 3.2 kV/13.2 kV 500 kVA 8% 3.5 Figure 3.68 A One-Line Diagram of Problem 3.5. Compute the following: i) The per unit equivalent impedance model ii) The fault current if a balance three-phase fault occurs on the inverter bus Consider the microgrid of Figure 3.68. A three-phase 500 kVA, 440/ 3.2 kV transformer with the per unit reactance of 3.5% feeds from an The distribution line is 10 miles