5. 10 MVA, 13.2 kV at the load. The one line diagram of an unloaded power system is shown in Figure 5. Reactances of the two sections of transmission line are shown on the diagram. The generators and transformers are rated as follows: 20 MVA, 13.8 kV, X" = 0.20 per unit Generator 1: Generator 2: 30 MVA, 18 kV, X" 0.20 per unit Generator 3: 30 MVA, 20 kV, X" 0.20 per unit. Transformer Ti: 25 MVA, 220 Y/13.8 A kV, X=10% Transformer T2: Single-phase units each rated 10 MVA, 127/18 kV, X=10% Transformer T3: 35 MVA, 220 Y/22 Y kV, X = 10% Transformer Problems - Page 1 6. Draw the impedance diagram with all reactances marked in per unit and with letters to indicate points corresponding to the one-line diagram. Choose a base of 50 MVA, 13.8 kV in the circuit of generator 1. T₁ C B j800 D 3 Figure 5 11000 E Draw the impedance diagram for the power system shown in Figure 6. Mark impedances unit Naals