A single-line diagram of a four-bus system is shown in the Figure with all positive sequence reactance's. Let a three-ph

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A Single Line Diagram Of A Four Bus System Is Shown In The Figure With All Positive Sequence Reactance S Let A Three Ph 1 (52.91 KiB) Viewed 17 times

A single-line diagram of a four-bus system is shown in the Figure with all positive sequence reactance's. Let a three-phase fault occur at bus 2 of the network. Assume the prefault voltage at bus 2 to be 120° p.u., and neglect all prefault currents. a) Calculate the initial symmetrical rms current in the fault in p.u. (/=?) b) Determine the per-unit voltages during the fault at buses 1, 2, 3, and 4. (V₁, V₂, V3, V₁ = ?) c) Compute the per-unit fault currents contributed to bus 2 by the adjacent unfaulted buses 1, 3, and 4. (112132142 =?) d) Compute the contribution from generator G1 and G2 to the fault current. (G/Gz = ?) Bus 3 j0.25 GI) 10.2 j0.25 ши m 10.1 Bus 2 j0.125 Bus 1 j0.2 j0.4 Bus 4 m 10.1 G2) j0.2