Power transformers life assessment based on random fuzzy theory and improved Markov method

In order to estimate transformer remain life, from the perspective of transformer performance degradation and health indices characteristics, considering the relevant factors of transformer life, based on transformer life assessment three stages systems, the calculation method of every year health index is put forword. Then considering the uncertainty factors, an improved Markov prediction model is founded for the prediction of the transformer life. The example verifies the feasibility of this method.