针对大亚湾核电站原有的一回路水压试验超压保护装置老化严重且维修升级成本高等问题,研究并设计出全新的数字化一回路水压试验超压保护装置。新设计的一回路超压保护装置以西门子S7-200 PLC系统为核心,搭配模拟量输入模块EM231、模拟量输出模块EM232和人-机交互面板TD400C,实现对核电厂水压试验过程中的压力数据动态实时监测、分析、处理、显示和逻辑运算后向外输出控制决策。设计搭建一套水压试验超压保护装置测试平台,用以对新设计的超压保护装置进行离线检测、校准和试验。新设计的超压保护装置具有灵活便携、精度高、智能化和易维护等优点,并且已经成功应用于大亚湾等电站超过2年。 In view of the serious aging of the overpressure protection device of the original primary circuit of Daya Bay Nuclear Power Station and the high cost of maintenance and upgrading, a new overpressure protection device for a digital primary loop hydrostatic test is studied and designed. The new design of a circuit overvoltage protection device to Siemens S7-200 PLC system as the core, with the analog input module EM231, analog output module EM232 and human-machine interaction panel TD400C, to achieve the pressure during the nuclear power plant hydrostatic test Data dynamic real-time monitoring, analysis, processing, display and logic operations output control decisions out. Design a hydraulic test overpressure protection device test platform for the new design of overpressure protection device for offline testing, calibration and testing. The newly designed overpressure protection device has the advantages of flexibility and portability, high precision, intelligence and easy maintenance, and has been successfully applied to the Daya Bay power station for more than two years.