电力变压器状态评价方法研究

The Study of Methods of Power Transformer State Assessment

为了使电力变压器的状态检修的依据更加准确合理,采用模糊综合评判方法对电力变压器的运行状态进行评价,对状态量以相对劣化度进行量化处理,确定各状态量的隶属度函数。此外,把权重系数问题转化为粗糙集理论中属性重要性的评价问题,使权重的分配更加合理;利用模糊综合评判方法及权重系数确定方法,构建电力变压器的状态评价模型。最后,实例验证分析证明了该评价模型能反映电力变压器整体的状态水平,为电力变压器的状态检修提供合理的决策依据。

In order to make the basis for the condition based evaluation of power transformer more accurate and reasonable,an fuzzy comprehensive evaluation method is used to evaluate the operation state of power transformer,the relative degree of deterioration is quantified to determine the membership function of each state.In addition,the weighting factor for the state variable is transformed into attribute importance of rough set theory which makes allocation of weights more rational.The power transformer condition evaluation model is constructed by fuzzy comprehensive evaluation method and weighting factor determination method.In the end,case analysis shows that the evaluation model can reflect the state of the overall level of power transformer,and provides a reasonable basis for the condition evaluation of power transformers.