The substation automation system based on IEC61850 standard supports free distribution of functions and its reliability is closely related to the distribution mode of its functions. The realization principles of functions' free distribution are introduced and the method of reliability evaluation of substation automation system is proposed based on IEC61850. The system's functions are deposed into the connection diagram of logical nodes based on IEC61850 which consists of logical nodes and logical connections. The fault rates of logical nodes and logical connections are calculated based on the fault rates of physical devices and physical connections, then using fault tree analysis method to calculate the availability of system's functions and using it as the reliability index of system. Finally, the interval interlock function is taken as an example to introduce the method and confirm its feasibility which provides guidance to improve the distribution mode of system's functions and enhance the reliability of system.%基于IEC61850标准的变电站自动化系统支持功能自由分布,系统的可靠性与其功能分布方式密切相关.介绍了变电站自动化系统功能自由分布的实现原理,提出了基于IEC61850的变电站自动化系统可靠性评估方法,即基于IEC61850标准,将系统功能分解成由逻辑节点和逻辑连接构成的逻辑节点连接图,通过物理装置和通信链路的故障率,计算各逻辑节点和逻辑连接的故障率.在此基础上,根据系统功能的可靠性框图,计算系统功能的可用率,并以此评估系统的可靠性.以间隔联锁功能为例对方法进行详细说明并对其可行性进行了论证,为优化系统功能分布方式和提高系统可靠性提供指导依据.
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