The figure below shows the one-line diagram of a simple power system with generation at buses 1 and 2. The voltage at bus 1 is V = 1.020 per unit. Voltage magnitude at bus 2 is fixed at 1.05 pu with a real power generation of 400 MW. A load consisting of 500 MW and 400 Mvar is taken from bus 3. Line admittances are marked in per unit on a 100 MVA base. For the purpose of hand calculations, line resistances and line charging susceptances are neglected. 1 Y13 = -j20 3 Slack Bus V = 1.040 912 = -j40 500 MW Y23 = -j20 400 Mvar 2 P2=400 MW |V|= 1.05