可拓理论在变压器油纸绝缘状态综合评估中的应用
Application of Extension Theory in Comprehensive Assessment of Transformer Oil-Paper Insulation

针对变压器绝缘状况本身存在的模糊性和不确定性，导致应用单一指标评估油纸绝缘变压器的状态时，可能会出现互相矛盾和不相容状况，本文提出了基于可拓理论的评估模型，融合多时域特征量综合评估变压器的油纸绝缘状态。首先，搭建变压器评估的分层多级框架，引入可拓层次分析法确定各指标的权重系数；其次，利用大量的实测数据建立变压器四种物元模型状态的经典域和节域；然后采用关联函数确定待诊变压器的绝缘状态，实现变压器定性与定量相结合的综合评估；最后通过实例验证该方法的有效性和可行性。
Due to the fuzziness and uncertainty of the transformer’s insulation state by itself, when using the index to evaluate the oil-paper insulation transformers alone, it may appear contradictory and incompatible situations. In this paper, an evaluation model based on extension theory is proposed to comprehensively evaluate the oil paper insulation state of transformer by integrating multi time domain features. Firstly, the hierarchical framework of transformer evaluation is established, and the extension analytic hierarchy process is introduced to determine the weight coefficient of each index; Secondly, we need to build the classical domain and joint domain of transformer’s four kinds of matter-element models using large amounts of the measured data. Then, using correlation function to determine the insulation state of transformers, this paper realizes the synthetic evaluation with the qualitative and quantitative combination for the transformer. Finally, the effectiveness and feasibility of the method are verified by an example.