基于加权灰靶理论的电力变压器绝缘状态分级评估方法

Method for Insulative Condition Classification Evaluation of Power Transformer Based on Weight Coefficient Grey Target Theory

针对电力变压器绝缘状态评估问题,提出了一种在没有标准故障模型的情况下进行变压器状态分级识别的新方法。本文将加权灰靶理论引入变压器绝缘状态评估中,结合油中溶解气体分析技术,构建了变压器状态评估的算法及实现步骤。运用灰贡献度分析理论解决了变压器绝缘状态评估中各指标的权重问题。同时结合电力变压器实际情况,根据变压器故障按严酷程度的分布提出了变压器绝缘状态分级的方法。实验表明,该方法能够有效地解决在没有标准故障模型的情况下变压器绝缘状态识别的问题,为变压器状态评估提供了一种新的方法。

According to exist problem of power transformer insulative condition evaluation, a new method that can assess insulative condition of power transformer when there was no standard fault model is proposed. Weight coefficient grey theory is introduced into power transformer insulative condition evaluation with dissolved gas analysis technology, and then algorithm for power transformer insuIative condition evaluation and its steps are constructed. The weights of parameters of power insulative condition are obtained by using grey contribution degree theory. The classification of power transformer insulative condition is based on transformer fault serious degree distribution and the actual situation of power transformer. Experiments show that method in this paper is capable of solving the insulation condition evaluation problem efficiently with no standard fault model, and the method offers a new evaluation technique for power transformer insulation condition.