Apparatus and method for detecting error of substation

The present invention relates to an apparatus and method that can detect such as a terminal board, a ground of the power plant on the terminal boards, and power crossed over. SCADA (Supervisory Control And Data Acquisition) is connected to the terminal board of the remote small devices that are connected between the system and the power plant, at least for sensing at least for the power equipment sensing device is a terminal board for remote small apparatus of the invention for this purpose for measuring the state signal of the signal connection line connecting the measurement section; And it characterized in that it comprises for the signal connection line, and the remote terminal board predetermined by comparing the input voltage and the value returned between the devices, parts of analysis for determining whether or not at least to the signal line connection.