2. Figure 1 shows a single-line diagram of a power network, with all impedances of generators, transformers and lines shown in per-unit to a common base. Determine the bus admittance matrix of the network Ybus by inspection. [4 marks] j0.2 j0.3 j0.2 j0.4 j0.2 j0.25 3 Figure 1 j0.25