DC circuit monitoring system for railway passenger vehicle

The invention discloses a DC circuit monitoring system for a railway passenger vehicle. The system is provided with: at least one data acquisition module which is connected with a measured DC signal in each DC control loop of the railway passenger vehicle, which obtains the current of the measured DC signal, and obtains a corresponding DC acquisition signal after the self-oscillation, conditioningand filtering effects; a data processing and diagnosis module that is connected with each data acquisition module, and is used for respectively carrying out abnormality judgment on each acquired DC acquisition signal and outputting corresponding diagnosis information; and an information display module that is connected with the data processing and diagnosis module, acquires and analyzes each piece of diagnosis information, displays a detection current value of each DC control loop, and starts an alarm indication device in an abnormal condition. According to the invention, the functions of passenger vehicle DC signal