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安全完整性表示安全相关系统实现所要求的安全功能的能力水平,安全完整性等级的确定在系统安全生命周期的整体安全要求阶段进行.基于IEC61508定义的风险降低原理,给出了一种可行的确定安全完整性等级的流程,重点研究了定性、半定量、定量三类安全完整性等级确定方法.定性方法基于对风险后果和发生频率的定性分析直接确定安全功能的安全完整性等级,半定量和定量方法通过对实现安全功能的子系统或设备失效概率的量化分析,得到安全功能的平均要求时失效概率,进而确定安全功能的安全完整性等级.最后,使用半定量的保护层分析LOPA方法分析了车站联锁系统道岔故障的具体实例.
Safety Integrity Indicates the level of capability required by safety-related systems to achieve the required safety functions, and the determination of safety integrity levels takes place during the overall safety requirements phase of the system’s safety life cycle. Based on the risk reduction principle defined in IEC61508, a viable The process of determining the level of safety integrity focuses on three methods of qualitative, semi-quantitative and quantitative safety integrity.Qualitative methods directly determine the safety integrity level of safety functions based on qualitative analysis of risk consequences and occurrence frequency, And Quantitative Method Through the quantitative analysis of the failure probability of the subsystems or equipment to realize the safety function, the average required failure probability of the safety function is obtained, and then the safety integrity level of the safety function is determined.Finally, using semi-quantitative LOPA Analysis of the station interlocking system turnout fault specific examples.