The constituent principle of a new two-level microcomputer real-time supervisory system is discussed. It can be used for medium- and large-sized hydropower stations.The system has several functions :acquisition, processing,regulation, optimum operation, control, synchronism,event recording ; fault reminiscing, waveshape record, diagnosis and process ; relay protect, dispatch terminal and the work station of management system ,etc. The system is composed of main supervisory system of staion room,monitor system of chief office and monitor system of engineer office. A two-level microcomputer configuration is used in the main supervisory system ,and two-way parallel interrupt communication is used between two levels.The communication between main system and the monitor system of engineer office is realized with string communication interface,and the communication between the monitor system of station chief office and dispatch centre of electric power network is realized with telecommunication interface. The lower position microcomputer uses AC sampling to acquire field AC analog singnal and uses DC sampling to acquire non-electrical signal through transducer. The modulalarized programming is used in the system softwares. The module is dispatched by realtime operation system.
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