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I don't think that there is an existing PSS/E function to detect the period of over voltage. I am not sure what the practical usage on the period either. Normally, the over voltage protection would be used for generator or other equipment tripping. But there is no general objectives on scanning the whole system for the duration of over voltage. But if you really want to find do this, you can try to write a user defined model to scan all the buses. Another workaroundis to use Under/Over voltage Generator Trip Relay model (VTGTPAT or VTGDCAT). Set the bus you want to detect as monitor bus, and set the generator to be tripped as a fake machine (in an island, not connected to your studied system) with classic model and the inertia as 0.0.