For analyzing the influence of the self-checking period and other factors on the reliability of relay protection based on host and backup, a Markov state space model is constructed. Taking the probability that host is at work and backup is intact as a optimal objective, the relationship between host failure rate and self-checking period, the routine test period are analyzed. Simulation test show that the higher the reliability of the hardware and software of host and backup, the longer the optimum self-checking period. The shorter the time spent by self-checking, the higher the reliability of system. When the host's reliability is given, the optimum self-checking period and optimum routine test period are selected to get the optimum reliability of dual relay protection, which has good reference value for the design of relay protection equipment with host and backup.%为了分析自检程序周期等因素对基于主、备机保护的继电保护装置可靠性的影响,建立了马尔科夫状态空间模型.以主机工作、备机完好的概率作为优化目标,分析各种状态下主机故障率与自检、人工检修周期之间的关系.仿真结果表明,主、备机软硬件可靠性越高,所需最佳自检周期越长,自检时间越短,系统可靠性越高.当主机的可靠性一定时,选取最佳自检周期和最佳检修周期,可获系统最佳的可靠性.对设计主、备保护的继电保护装置具有较好的参考价值.
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