The single-line diagram of a four-bus system and its bus impedance matrix are shown below BUS…

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The single-line diagram of a four-bus system and its bus impedance matrix are shown below BUS…

The single-line diagram of a four-bus system and its bus impedance matrix are shown below BUS 2 0.25 j0.2 0.125 0.25 0.4 BUS 3 BUS 1 BUS 4 j0.1 0.1 j0.2 j0.2 ground is the reference node) 0.25 0.2 0.16 0.14 0.2 0.23 0.15 0.151 ZBUs =기0.16 0.15 0.196 0.1 0.14 0.151 0. 0.195 A solid three-phase fault occurs at bus 2 of the network. (a) Calculate the initial symmetrical RMS current in the fault. (b) Determine the voltages during the fault at buses 1, 3 and 4. (c) Compute the fault currents contributed to bus 2 by the adjacent unfaulted buses 1, 3 and 4. (d) Find the current flow in the line from bus 3 to bus 1. Assume the prefault voltage at bus 2 to be 1 pu, and neglect all prefault currents.
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