Large power transformer condition evaluation based on multilevel extension theory

Condition evaluation on large power transformer is an important approach to improve reliability of transformer and provide proper decision-making for condition-based maintenance by means of combining multilevel extension assessment method with influencing factors for transformer condition, a new method of transformer condition evaluation based on multilevel extension assessment was presented in this paper. Extension analytic hierarchy process (EAHP) was applied to calculate the weight of the transformer condition information. At last two examples were taken to prove the evaluation method to be correct and effective.