TOS5200 does not have flashover (discharge) detection capabilities.
However, TOS9300 series can more easily detect momentary discharges during the withstanding voltage test by increasing the response speed (sensitivity) of the current detection.
We recommend considering TOS9300 series for this functionality.
For more details, read TOS9300 series user’s manual – chapter of Withstanding Voltage and Insulation Resistance Tests – Setting Test Conditions – Current detection response speed (Filter).