CAJ | 학술논문

相比恒定失效率,时变失效率能更准确地模拟保护装置失效特性。文中针对直流保护装置时变失效特性,在区分老化失效和偶然失效数据的基础上,基于指数函数拟合常值偶然失效率,基于Weibull分布拟合时变的老化失效率,并综合老化和偶然失效率获取其时变失效特性。基于某区域电网直流保护装置现场失效数据,揭示了该电网直流保护装置的时变失效率,并分别分析了不同批次装置及装置模块的时变失效特性。分析表明,不同批次装置分别处于损耗失效和偶然失效期,应分别制定维修策略,同时电源、通信单元易进入损耗失效期。
상비항정실효솔,시변실효솔능경준학지모의보호장치실효특성。문중침대직류보호장치시변실효특성,재구분노화실효화우연실효수거적기출상,기우지수함수의합상치우연실효솔,기우Weibull분포의합시변적노화실효솔,병종합노화화우연실효솔획취기시변실효특성。기우모구역전망직류보호장치현장실효수거,게시료해전망직류보호장치적시변실효솔,병분별분석료불동비차장치급장치모괴적시변실효특성。분석표명,불동비차장치분별처우손모실효화우연실효기,응분별제정유수책략,동시전원、통신단원역진입손모실효기。
The time-varying aging failure rate(AFR) can simulate the failure characteristic of protection devices more accurately than the mean failure rate(MFR).This paper focuses on the time-varying failure rate(TFR) characteristics for the HVDC protection devices and firstly divides the failure data into two catalogs,i.e.the aging failure and random failure.Next,with the above data,the time-varying aging failure rate(AFR) is estimated with the Weibull distribution function,and the constant random failure rate(RFR) is drown up with estimating exponential distribution function;then TFR is obtained with the addition of AFR and RFR.Furthermore,based on the field failure data of a regional power grid,TFR of the grid can be obtained and the differences in time-varying failure characteristic of different batches and modules of protection devices are given.Results show that different batches of the devices are,respectively,in the loss failure period and the random failure period,thus the maintenance strategy should be formulated severally.Meanwhile,results also indicate that power and communication unit is easy to enter the loss failure period.