电力变压器状态评估

Preliminary Research on State Evaluation of Power Transformer

长期以来,人们对变压器的研究往往侧重于:在变压器发生故障后,用故障前后特征量的变化来进行变压器的故障诊断。而笔者在电业局现场工作中体会到:对运行单位而言,更关心的是运行变压器状态的好坏,而故障后的诊断意义显得不再重要。针对这个问题,提出变压器研究的另外一个新思路,即:除了对故障后的变压器进行故障诊断外,更重要的是综合利用变压器的历史数据和在线监测数据对运行中的变压器进行状态评估,通过状态评估,可以明确判断运行中变压器状态的好坏,从而为变压器的状态检修或者安排变压器计划检修提供科学的决策依据。鉴于模糊综合评判能够对多因素事物作出综合评判,运用模糊综合评判构成了变压器状态评估的框架。

Power transformer fault diagnossis is always the research focus in power system. But the status of transformer is more important than tnmsfonner fault diagnosis for the technology department of dectric power bureau based on the field experiences. For this reason, a new idea is put forward, that is, the research d tnmsfonner should include state evaluation as well as fault diagnosis with data that collected in local and historical database, Thereby, it could provide the scientific decision basis for transformer state evaluation or for planning the scheduled maintenance of transformer. The framework d transformer state evaluation is configurated based on fuzzy comprehensive evaluation because of its advantage d giving judgement on multi- factor object.