CAJ | 학술논문

相比恒定失效率,时变失效率在可靠性评估的准确度方面具有优势。文中针对电网继电保护装置失效特性,在区分偶然失效和老化失效的基础上,利用指数分布函数拟合估算继电保护装置的常值偶然失效率,利用Weibull、正态等分布函数拟合,估算时变的老化失效率,并利用可决系数比较拟合的优劣。基于区域电网继电保护装置现场失效情况形成数据,获得了该电网保护装置的时变失效率。仿真表明,实际电网的老化失效数据符合Weibull分布。针对该电网地理特点,分析了环境、区域因素对保护装置失效率的影响,结果表明该区域电网保护装置恒定失效率基本一致,老化失效率与自然气候相关。
상비항정실효솔,시변실효솔재가고성평고적준학도방면구유우세。문중침대전망계전보호장치실효특성,재구분우연실효화노화실효적기출상,이용지수분포함수의합고산계전보호장치적상치우연실효솔,이용Weibull、정태등분포함수의합,고산시변적노화실효솔,병이용가결계수비교의합적우렬。기우구역전망계전보호장치현장실효정황형성수거,획득료해전망보호장치적시변실효솔。방진표명,실제전망적노화실효수거부합Weibull분포。침대해전망지리특점,분석료배경、구역인소대보호장치실효솔적영향,결과표명해구역전망보호장치항정실효솔기본일치,노화실효솔여자연기후상관。
The time-varying failure rate（TFR） has advantages over the mean failure rate（MFR） in accuracy for reliability assessment.The estimation approach for the TFR of the relay protection device（RPD） with the field data is proposed.According to the feature of RPD failure,the data is first divided into random failure data and aging failure data.And then for the random failure data,the constant random failure rate（RFR） of RPD is drawn up with estimating 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 data of real power grid obeys the Weibull distribution law.Furthermore,the general TFR is,obtained with the addition of the RFR and AFR,estimated with the field data in a regional power grid.Finally,considering the geographical features of the power grid,environmental and regional factors,failure rate is calculated and the conclusion is drawn： MFR is basically consistent;AFR depends on climate.