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To simulate an single line to ground fault in dynamic simulation you need to use a fault impedance equal to the Thevenin impedance in zero and negative sequence at the faulted bus.
If the saved case do not include sequence data you have to calculate the impedance yourself and enter the value (X0 + X2) as fault impedance. PSS/E do not model neqative and zero sequence in dynamic simulations, but the positive sequence voltage will be correct during the single line to ground fault.
If zero and negative sequence data are present in the case it is just to use disturbance "Calculate and apply unbalanced bus fault..." directly in the dynamic simulation, and PSS/E will calculate the equivalent fault impedance automatically.
