18.4.7. Systematic fault analysis using Zbus matrix

For large networks, this method is applicable. Consider the network shown in Figure 18.32. Assume a three-phase fault at bus k has occurred through fault impedance Zf.
Figure 18.32 Fault at bus k.
Prefault-bus voltages are obtained from load-flow solution and are a column vector.


Short circuit currents are larger than steady-state values and hence can be neglected. Represent the bus load by a constant impedance evaluated at the prefault bus voltage, that is,


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