Large-current monitoring system

The invention discloses a large-current monitoring system which comprises a programmable logic controller, an electric parameter acquisition module, a display screen, a failure alarm device and an upper computer. The output end of the electric parameter acquisition module is connected with the input end of the programmable logic controller, and the output end of the programmable logic controller is connected with the display screen, the failure alarm device and the upper computer respectively; the electric parameter acquisition module is serially connected on a power supply circuit and is used for acquiring real-time parameters of the power supply circuit. System digital quantity input and tripping control are executed through the programmable logic controller after adopting the electric parameter acquisition module to measure the real-time parameters of the power supply circuit, the problem that starting current and short-circuit current of a high-current electrical power supply system are difficult to distinguish is solved through a high-sensitivity phase-sensitive protective mode, and reliability in actuation of a current protective device is improved. In addition, the objective of remote monitoring through communication of an industrial Ethernet and a ground control center is achieved.