显著性差异法则在变压器状态评估中的应用

评估指标体系和状态划分是变压器状态评估中的关键因素.合理确定变压器状态分级标准对确定变压器状态等级至关重要.变压器状态划分依据经验一般分为正常、注意、异常和严重四个等级,现有分级方法缺乏合理统一的依据,在变压器状态评估中容易引起混乱.显著性差异法则把30％的变化作为判断依据,可以按照这一法则根据评估指标为变压器状态分级...

Application of Significant Difference Rule in Power Transformer Condition Assessment

Index system and condition grade scope classification are key elements for power transformer condition assessment.Reasonable classification criterion is of great importance for determining the condition grade scope.Transformer condition is usually classified into normal,noticeable,abnormal and serious 4 grades with different grade scope classification criterion based on personal empirical knowledge,which makes it easy to be confused in application of condition assessment because of inconsistence.Reasonable condition classification criterion with scientific base is necessary for power transformer condition assessment.Based on significant difference rule in comparing,30 percent of change is used as classification criterion for classifying the condition grades with condition assessment index.Condition assessment is performed with hierarchy analysis model and health index model for one transformer in good condition according to the suggested classification criterion.Results show that the transformer condition was in the same grade,which verifies the reasonability of this classification criterion for power transformercondition assessment.