基于模糊理论和证据理论的变压器绝缘老化状态评估

Transformer Insulation Aging State Assessment Based on Fuzzy Theory and Evidence Theory

变压器状态信息具有模糊性且有时无法相互融合,为此提出了一种电力变压器绝缘状态评估方法。该方法首先将油浸式变压器绝缘状态评估看作一个多决策问题,利用模糊理论与证据理论搭建变压器绝缘状态模糊评估模型;继而采用模糊理论将变压器中油色谱、电气试验与油化试验数据,作为变压器特征指标量进行量化处理,消除变压器状态信息中的模糊性;最后将模糊综合评价作为证据理论的基本信度配置,与作为证据的特征量进行证据融合,消除变压器状态信息中的矛盾冲突,从而对整体变压器绝缘状态进行评估。实例结果验证了该方法的有效性与实用性。

To solve the problem of fuzziness and failure in integration of transformer state information,this paper presents a kind of assessment method for power transformer insulation state.This method firstly regards state assessment on the oil immersed transformer as a multiple decision-making problem and uses the fuzzy theory and the evidence theory to establish a fuzzy assessment model for transformer insulation state.Then it uses the fuzzy theory to perform quantitative processing on characteristic index quantities of the transformer including oil chromatography data,electrical test data and oil refining data so as to remove fuzziness of transformer state information.Finally,it takes fuzzy comprehensive assessment as basic credibility configuration for the evidence theory and performs evidence fusion with characteristic quantities so as to eliminate conflicts of transformer state information and make an assessment on transformer insulation state.Example results verify effectiveness and practicability of the proposed method.