一种基于PHM考虑老化和设备状态的油浸式变压器故障率模型

比例故障率模型(Proportional hazard model,PHM)中的故障率函数包含基准故障率函数和连接函数,前者表征设备的一般老化,后者描述设备状态的影响,对不同影响因素(协变量)进行量化。基于PHM提出了一种综合考虑老化和设备状态的油浸变压器故障率模型,基准故障率函数采用常用的温升老化模型,连接函数中的协变量选择了能够全面客观反映设备状况的油中溶解气体信息。推导了故障前时间的概率密度分布并给出了使用极大似然估计拟合参数的方法。算例证明了拟合方法的正确性,结果分析表明提出的模型具有正确合理表征故障率的能力,并且能有效表征变压器维护操作对故障率的影响。...

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Bibliographic Details
Published in电力系统保护与控制 Vol. 42; no. 18; pp. 66 - 71
Main Author 鹿鸣明 王逸飞 郭创新 曹敏
Format Journal Article
LanguageChinese
Published 浙江大学电气工程学院,浙江 杭州,310027%云南电力试验研究院 集团 有限公司,云南 昆明,650051 2014
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ISSN1674-3415

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Summary:比例故障率模型(Proportional hazard model,PHM)中的故障率函数包含基准故障率函数和连接函数,前者表征设备的一般老化,后者描述设备状态的影响,对不同影响因素(协变量)进行量化。基于PHM提出了一种综合考虑老化和设备状态的油浸变压器故障率模型,基准故障率函数采用常用的温升老化模型,连接函数中的协变量选择了能够全面客观反映设备状况的油中溶解气体信息。推导了故障前时间的概率密度分布并给出了使用极大似然估计拟合参数的方法。算例证明了拟合方法的正确性,结果分析表明提出的模型具有正确合理表征故障率的能力,并且能有效表征变压器维护操作对故障率的影响。
Bibliography:LU Ming-ming,WANG Yi-fei,GUO Chuang-xin,CAO Min(1. College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China; 2. Yunnan Power Research & Test Institute (Group) Co., Limited, Kunming 650051, China)
The Cox's time-dependent proportional hazard model(PHM) is widely used. Its hazard function contains two parts: the baseline hazard function which represents the aging process, and the link function which represents the equipment status. Based on PHM this paper proposes a new failure rate model for oil-immersed transformer concerning both aging process and equipment inspection information. The baseline hazard function follows a temperature-based aging model. The quantity of the dissolved gas is used as the covariate of the link function, for its comprehensiveness. We determine the probability density function of the time to failure, and the maximum likelihood estimation(MLE) is used to estimate the model's parameters. The case study proves the efficiency of the proposed model, which is able to ch
ISSN:1674-3415