The device records the details of the 30 most recent insulation fault events. The fault events are triggered by one of following statuses:
preventive insulation fault
Event 1 is the event that was recorded most recently and event 30 is the oldest recorded event.
The oldest event is deleted when a new event occurs (the table is not reset).
By referring to this information, the performance of the distribution system can be improved and maintenance work is facilitated.