Research And Analysis Of Safety Technology On The Rail Transit All-electronic Computer Interlocking System

With the development of the rail transit towards high-speed, heavy-loading, largecapacity and high-density, the interlocking system which is responsible for the safe operationand efficiency has been requested to meet the higher requirements of function, performanceand reliability. Making the interlocking system completely electronic not only can make thetransport much safer, more efficient and more intelligent, but also can lower thecomprehensive cost and prolong the life cycle. As a completely new thing, theoreticalresearch of the all-electronic interlocking system has a great significance on itspopularization and development; While, since the all-electronic interlocking system has notbeen widely applied, so its reliability, availability, maintainability and safety (RAMS)performance can not be analyzed by statistics. Based on this type of background, thisdissertation has studied the key safety technologies and system analysis of the rail transmitall-electronic interlocking system from the perspective of the system risk analysis,requirements analysis, structural designing, detailed designing and engineering applicationaccording to the safety system designing process.The fault tree analysis, cause analysis, consequence analysis, common cause failureanalysis, interface hazard analysis and other analyses are comprehensively used to build arisk analysis list of the all-electronic interlocking system, seek the potentially dangerous stateand the risk source of the system and obtain the reasons caused by each risk source and theseverity of the consequences in this dissertation; The dissertation has revealed thefundamental techniques and main technical characteristics of the system, built theinformation model between each section and struture of the all electronic interlocking system,distributed and verified the main functions and THR of the system by adopting quantitativeanalysis method；This dissertation has obtained some main elements influencing the systemsafety level for the first time just by detailed designing and calculation analyzing of theall-electronic interlocking system, and comprehensively used the composite fail-safetytechnology such as "2-vote-2", reactive closed-loop detection，dynamic circuit and otherinherent fail-safety technologies and created the system circuit structure to reach thepresumptive safety index; Based on the reliability theories, the dissertation has establishedthe all-electronic interlocking system Markov model under different system structure such asthe warm standby and parallel connection to quantitatively calculate the RAMS of the relayinterlocking system, the traditional computer interlocking system and the all-electroniccomputer interlocking system under different structure and then compared the these RAMSindexes with each other. At last, the dissertation has also analyzed and calculated theall-electrnoic interlocking system’s RAMS performance when it will be put into engineering application, while the results show that there are not any significant changes of the wholeRAMS indexes after the system realizes engineering applications.The achievements of the dissertation will provide the scientific data and theoreticalfoundation for the further research, as well as for the designing scheme, developing a plan oftransformation and money, setting operations management maintenance procedures, makingmaintenance strategy and establishing reliability management. Besides, the dissertationachievements are still able to offer some RAMS performance prediction to those who arestudying or will study the all-electronic interlocking system, especially for discovering thepotential risk source during designing or realizing process to avoid safety risks.