Calculate the nominal currents and three-phase short circuit levels, the impedance of the lines, Zsource, Ztrans, Also provide an equivalent circuit of the power system, Short circuit levels given by the equivalent circuit: Ifault1, Ifault2, etc…

 

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Grid MVAsc: 300 MVA 66KV 9 Y-Y @ Transformer 1 66KV/20KV 100MVA 01+0.3 ohm 8 Bus 1: 20KV Transformer 2 20KV/11KV 100MVA 01+0.3 ohm Bus 4: 11KV Y-Y * Load 3: 60 MVA, 0.9 lagging Bus 2:20KV Bus 3:20KV 5 H Load 1: 10 MVA, 0.9 lagging 2 Bus 5: 11KV Load 2: 10 MVA, 0.9 lagging Load 4: 10 MVA, 0.9 lagging Grid MVAsc: 300 MVA 66KV 9 Y-Y @ Transformer 1 66KV/20KV 100MVA 01+0.3 ohm 8 Bus 1: 20KV Transformer 2 20KV/11KV 100MVA 01+0.3 ohm Bus 4: 11KV Y-Y * Load 3: 60 MVA, 0.9 lagging Bus 2:20KV Bus 3:20KV 5 H Load 1: 10 MVA, 0.9 lagging 2 Bus 5: 11KV Load 2: 10 MVA, 0.9 lagging Load 4: 10 MVA, 0.9 lagging