Over-current and phase loss disconnection measuring and control system for electric vehicle charging line

The invention discloses an over-current and phase loss disconnection measuring and control system for an electric vehicle charging line. The system comprises a measuring and control device and a mechanical switching switch, wherein the measuring and control device detects a switch input signal of the mechanical switching switch; the measuring and control device comprises a main control chip, a current sampling circuit, a potential raising circuit, a monitoring circuit unit, and a temperature and humidity monitoring unit; a dual amplifying circuit is connected between the main control chip andthe current sampling circuit; the dual amplifying circuit outputs the current sampling signal after signal amplification to the main control chip, and the main control chip detects temperature and humidity signals of the temperature and humidity monitoring unit; the main control chip is electrically connected to the potential raising circuit and the monitoring circuit unit respectively, and the main control chip outputs a