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It is just to enter a resistive fault admittance, i.e. G>0 and B=0.
Example: A resistive shunt of 500 MW:
psspy.dist_bus_fault(ibus,1,0.0,[ 500.0,0.0])
A resistance of 10 ohm:
psspy.dist_bus_fault(ibus,3,0.0,[ 10.0,0.0])