HN1251-5.38 Type Half-Speed Turbine Control-protection System Analysis And Debugging

The control-protection system of HN1251-5.38 type half-speed turbine is the most important part of the third generation passive advanced pressurized water reactor nuclear power control technology. The control system adopts the advanced automatic control platform,the main trip protection and electro-hydraulic control function achieved by decentralized control system(DCS) as the core platform, shafting instrument monitoring and fault diagnosis function achieved by CSI6500 intergrated intelligent platform.The main trip protection function following the design concept of four redundancy, it would trip the turbine timely as emergency conditons. The electro-hydraulic control function mainly includes lifting speed,controlling load and load loss forecasting,etc. Shafting instrument monitoring and fault diagnosis function mainly relates to shafting parameters as shafting vibrations and rotor displacements. And this half-speed turbine control-protection system has complex interface system, including important internal system interfaces as speed signals and external system interfaces as these signals from the nuclear island or the main generator island. By analysing this control-protection system design features and classifying interface signals,the research results about half-speed turbine debugging ways and related risk precaution measures would be given by this paper.Firstly, according to design characteristics of HN1251-5.38 half-speed turbine control-protection system, it introduces and analyses the design ideas and function features about the main trip protection unit and electro-hydraulic control unit system, shafting instrument monitoring unit and fault diagnosis unit system, and deeply analyses related interface system, meantimes giving classfication analysis ways of the interface system, divided into supporting interface systems and depending interface systems, also the points of debugging and attention for all kinds of interfaces were presented.Secondly, a kind of debugging planning and method was proposed, including sub packets division, test items establishment, debugging plan process, debugging methods that relates shafting instrument monitor unit system, turbine main trip protection unit system and turbine electro-hydraulic control unit system,shafting fault diagnosis unit system, etc. The effects of debugging methods used in paper works and experiments are introduced.Thirdly, this paper introduces the methods and measures of risk precontrols for the control-protection system debugging of HN1251-5.38 type half-speed turbine, and gives available effects about the general risk control form and sub-package risk control form.Through the research, debugging methods and risk precontrol measures put forward, provide reference basis for the same type of half-speed turbine debugging, and these will promote the introduction and autonomy development of third generation passive advanced pressurized water reactor nuclear power control technology, also have important guiding significant.