The ground level monitoring device for main control system

PURPOSE: A grounding level monitoring device for a main control system is provided to prevent malfunction of a main control system beforehand and to stably control power generating equipment in a power plant, thereby improving the robustness of power plant operation. CONSTITUTION: A grounding level monitoring device for a main control system(100) comprises a grounding line measuring unit, a control card output signal measuring unit, an abnormal state detecting unit, and a display unit. The grounding line measuring unit measures a voltage value and a current value of a grounding line. The control card output signal measuring unit measures an output signal of multiple control cards. The abnormal state detecting unit receives a reference voltage value from a user and receives the voltage value of the grounding line in the grounding line measuring unit. When the voltage value of the grounding line is higher than the reference voltage value, the abnormal state detecting unit outputs an alarm signal. The display unit receives a measured signal from the grounding line measuring unit and the control card output signal measuring unit and respectively displays the measured signal to the outside and receives the alarm signal from the abnormal state detecting unit and displays the alarm signal to the outside. [Reference numerals] (AA) Input power; (BB) External power measuring unit; (CC) Noise filtering unit; (DD) Power measuring unit; (EE) Internal power supply unit; (FF,GG,HH) Control card; (II) Input signal; (JJ,KK,MM) Output signal; (LL) Abnormal state detecting unit; (NN) User designation; (OO) Ground line measuring unit; (PP) Data storage unit; (QQ) Control card output signal measuring unit; (RR) Display unit