On the Estimation of Time-Varying Failure Rate to the Protection Devices Based on Failure Pattern
Compared with the mean failure rate (MFR),timevarying failure rate (TFR) has advantages in accuracy and is more suitable for reliability assessment.This paper proposes the estimation approach for the TFR of the relay protection device with the field data.According to the feature of protection devices failure,it first divides the data into random failure and aging failure.And then,for the random failure data,constant random failure rate (RFR) is estimated by using exponential distribution function,for the aging failure data,aging failure rate (AFR) is estimated with the Weibull,normal,lognormal and Rayleigh distribution functions,and the best estimation is determined by the coefficient of determination.Simulation results show that the aging failure obeys the Weibull distribution law.Finally,the general TFR is,obtained with the addition of the RFR and AFR,estimated with the field data in a regional power system.
Time-varying failure rate:Protection Device Random Failure:Aging Failure:Weibull distribution function
Ruichen Wang Ancheng Xue Shaofeng Huang Xiaoguai Cao Zhen Shao Yuhang Luo
State Key Laboratory for Alternate Electrical Power System with Renewable Energy Sources North China EHV Power Transmission Company China Southern Power Grid Guangzhou,China
国际会议
威海
英文
902-905
2011-07-06（万方平台首次上网日期，不代表论文的发表时间）