基于缺陷分析的保护装置可靠性评价研究

Study on the reliability evaluation of protection devices based on defects analysis

继电保护系统是电力系统安全稳定运行的第一道防线,研究其可靠性具有重要意义。目前继电保护可靠性研究主要从保护的拒动和误动方面进行分析,对数据样本相对较多的缺陷数据却没有有效利用。在对保护装置的缺陷信息进行分类预处理的基础上,应用最小二乘法估计二参数威布尔分布的参数,进一步得到基于缺陷信息的可靠度函数及失效率函数等并进行了相关分析。算例表明,通过计算威布尔分布的相关参数并分析可靠度、失效率及平均故障间隔时间等可靠性指标,能为分析继电保护装置的缺陷规律及可靠性评估提供一定的参考。

Protection system is the first defense line to ensure the safe operation of power grid, so it is of great significance to study its reliability. Currently, the reliability research of protection system mainly focuses on misoperation and fail-to-operation, yet it does not effectively take advantage of defect information which would occur in great probability. This paper analyzes defect information of protection devices and estimates the parameters of two-parameter Weibull distribution as well as the reliability function, failure rate function and so on. The study case shows that it can supply reference for further reliability assessment of protection systems by calculating the parameters of Weibull distribution and analyzing indices such as reliability, failure rate, and mean time between failures.