基于集对分析方法的电力变压器绝缘状态评估策略

A Power Transformer Insulation Condition Assessment Method Based on Set Pair Analysis

针对大型电力变压器绝缘状态和故障机理复杂、具有不确定性、难以有效评估的问题,提出了基于集对分析方法的变压器绝缘状态评估策略。建立变压器绝缘状态定量和定性评估指标体系,在状态等级划分和指标参数提取的基础上,构建集对分析算法及实现步骤,用联系度及其数学表达式统一描述系统状态的不确定性问题,结合信度准则实现对变压器绝缘状态的评估。实例研究并与其他状态评估方法的比较表明,该策略可行、有效,为电力变压器绝缘状态评估提供了一种新的思路。

Assessment of the insulation states and failure mechanisms of large power transformers are complex,uncertain,and difficult in nature.To solve this problem,a strategy for transformer insulation condition assessment is proposed based on set pair analysis method.The qualitative and quantitative evaluation indices of transformer insulation conditions are established. The set pair algorithm and implementation steps are also constructed on the basis of condition grade division and index parameter extraction.The correlation and mathematical expressions are used to describe the uncertainties of system conditions; then combination of confidence criteria and the assessments of transformer insulation condition are achieved.Case studies and comparisons with other assessing methods show that the set pair analysis method is feasible and effective.The proposed strategy offers a new approach for effective transformer insulation condition assessment.