油浸式电力变压器状态评估模型及方法

On Model and Approach of Condition Assessment of Oil-immersed Transformer

针对现场实际,提出了油浸式变压器的状态评估模型及评估方法。模型结合变电运行、检修及在线监测系统数据,将变压器运行状态按层次结构进行评估。评估方法综合采用层次分析(AHP)、模糊层次分析(FAHP)方法进行了各层、各隶属级指标的静态权重及静态相对权重确定,根据各指标劣化程度提出了指标的关注度及相对关注度,并与静态相对权重结合提出劣化变权方法,在此基础上采用改进证据理论方法实现融合评估。实际算例分析表明,所建模型及评估方法能支持各相关指标,在把握变压器各部件状态的同时,可有效突出各指标的劣化程度,能有效指导现场变压器状态评估。

Combining the data collected from tansformer operation, maintenance and on-line monitoring system, an oil-immersed trans- former assessment hierarchy model and its assessment approach are presented according to the actual production. AHP method and FAHP method are integrated to identify the static relative weights of indicators. Degree of attention and relative degree of attention are defined concerning the degradation of the indicators. Then combining the static relative weights and relative degree of attention, the vari- able weights of degradation is defined and used as the correction factor of evidence. An improved evidence reasoning is performed on the basis of revised evidences to deduce the state of components of a transformer, according to the value sequence of the variable weights. Analysis of a practical example shows that the model and the approach are able to support the indicators, and can give the health status of the various components of transformers while effectively highlighting the degradation. The assessment model and approach can effectively guide the condition assessment of transformers in practice.