变电站继电保护设备状态检修可靠性分析方法研究

为进一步提高保护系统的可靠性,节约供电企业检修成本,需要对变电站继电保护设备状态检修的可靠性进行评估。首先,根据失效模式与影响分析法,分析设备的失效风险因素及影响,选取设备失效的可检度、发生度、严重度三项指标,以变电站线路保护装置本体为例进行风险评估,并提出风险应对策略,以提高继电保护设备的可靠性。其次,引入了状态空间法,分别建立变电站继电保护设备定期检修、状态检修马尔科夫模型,应用220 kV线路保护实例数据验证模型合理性,得出状态检修可提高保护设备可用度的结论。最后,通过仿真对设备可靠性进行综合分析,验证定期检修效率、状态评价系数及定期检修周期对保护设备可靠性的影响。

Research on the reliability analysis method of condition-based maintenance of relay protection equipment in substation

To improve the reliability of the protection system and reduce the maintenance cost of the power supply enterprise, it is necessary to evaluate the reliability of the state maintenance of the relay protection equipment in the substation. First, according to the failure mode and impact analysis method, the failure risk factors and influences of equipment are analyzed. Three aspects of equipment failure, namely, detectability, occurrence and severity, are selected. Taking the substation line protection device itself as an example, risk assessment is carried out and risk countermeasures are proposed to improve the reliability of relay protection equipment. Secondly, the state space method is introduced to establish the Markov model of substation relay protection equipment regular and state maintenance respectively. The rationality of the model is verified by a 220 kV line protection example data, and the conclusion is drawn that state maintenance can improve the availability of protection equipment. Finally, a comprehensive analysis of equipment reliability is carried out through simulation to verify the impact of periodic maintenance efficiency, the condition evaluation coefficient and the periodic maintenance cycle on the reliability of protective equipment. This work is supported by the Science and Technology Project of State Grid Corporation of China (No. 5212001900813).