电力变压器故障模式重要度的模糊评定方法

Fuzzy evaluation method for the importance of power transformer fault modes

由于设备价值昂贵、可靠性试验实施困难等客观因素,应用传统重要度分析方法难以实现电力变压器各故障模式的故障重要度分析,提出了一种基于梯形模糊数的电力变压器故障模式重要度评定方法。该方法在分析影响电力变压器故障模式重要度各因素的基础上,建立了电力变压器故障模式重要度评估指标体系;应用Delph i法确定评估指标的评价等级和评分标准,同时引入协调程度修正专家评分;并利用梯形模糊数确定各评估指标的权重;最后应用线性加权方法得出电力变压器各故障模式的重要度。评估实例表明,该方法简便、有效,能够为电力变压器的可靠性评估提供各故障模式的重要度。

Due to the high value and difficulties in reliability tests of power equipments,it is hard to realize the importance analysis of each fault mode of power transformer using traditional importance analysis method.Thus,this paper proposes a new evaluation method for the importance of power transformer fault modes based on trapezoidal fuzzy number.This method establishes evaluation index system of importance through analyzing the influencing factors of importance of fault modes,uses Delphi method to determine the evaluation grade and corresponding evaluation criterion of the evaluation indexes,introduces a coordination degree to modify the expert evaluation grade,and employs a trapezoidal fuzzy number to determine the index weight values.Finally,linear weighting method is used to obtain the importance of each fault mode.Evaluation examples show that this method is convenient and effective,and can provide the importance of each fault mode for power transformer reliability evaluation.