A Multi-parameter Comprehensive Analytical Method for Online Assessing Power Transformer Condition

The effective assessment on the operation condition of power transformer is an important means to conduct the condition maintenance for transformer and to improve the reliability of power system. Based on the amount of information of all kinds of online monitoring conditions obtained from the transformer intelligent components, the assessment model for comprehensive condition of transformer is established in this study through the introduction of extension theory. First, with respect to the disadvantage that there is considerable subjectivity in constructing judgment matrix by the traditional analytic hierarchy process (AHP), a new method is adopted to construct the judgment matrix. The orthogonal experimental design method, finite element simulation as well as AHP are adopted to determine the weighting of condition information index with scientific and objective attitude; next, the framework for comprehensive assessment of transformer condition is established with the extension-based comprehensive assessment method to achieve the qualitative and quantitative assessment on the transformer condition. The method is proved to be correct and valid through analysis of examples. Streszczenie. W artykule przedstawiono wyniki badań dotyczących opracowania modelu szacowania warunków pracy transformatora. W pierwszym kroku stworzono metodę budowy macierzy orzeczeń, z uwzględnieniem pewnych subiektywności tradycyjnej metody tworzenia tej macierzy (ang. Analytic Hierarchy Process). Do oszacowania wagi wskaźnika informacji o warunkach pracy, wykorzystano metodę eksperymentalną, symulację elementów skończonych oraz AHP. Wykonane badania wykazały poprawność działania metody. (Wszechstronna, wieloparametrowa metoda analizy do dynamicznego szacowania warunków pracy transformatora).