How to operate the digital protection relay device and the digital protection relay device

摘要

Based on the judgment results of an input circuit (11) in which an analog amount of electricity is input and converted into a digital signal, an arithmetic processing unit (21) that executes various arithmetic processing using the converted digital signal, and an arithmetic processing unit (21). An output circuit (31) that generates and outputs an operation signal for operating the switch, an operation unit (811) input from the input circuit (21), or an arithmetic processing unit (811) corresponding to an input display item from an external device. It is provided with a display unit (51) that displays the output of 21), an operation unit (811) that is input to the input circuit (21), or a storage unit (23) that records and saves input display items and time from an external device. When the display item of the display unit (51) is changed, the initially set display item and time are compared with the latest display item and time saved in the storage unit (23).