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Thank you for your response. I have tried to run the dynamic simulation with the distbranchtrip and distbranchclose APIs. The zero impedance line trips when I use distbranchtrip API. However, after the circuit is set to out of service the bus where the load was connected is automatically disconnected because it becomes islanded with no in-service machines connected to it. Thus, when I use the distbranchclose API an error message is displayed saying that the bus is out-of-service and has type code=4 so the branch is not put back in service. Is there a way around this?