Power transformer economic life prediction method based on life data

Currently, a unified definition for the economic life of transformers is not formed at home and abroad, and the study mainly focuses on economic evaluation. The invention provides a power transformer economic life prediction method based on life data. According to the method, a transformer economic life prediction model with the EUAC (equivalent uniform annual cost) minimum taken as a basis is constructed, classification and critical data extraction are performed on full-life data of a transformer for calculation of critical parameters in the model, and the failure rate and probability distribution of the shutdown duration are acquired through calculation with a distribution-free PHM (proportional hazards model) and a Monte Carlo simulation method; then economic elements are analyzed, and quantitative prediction about the economic life of the power transformer is realized on the basis of calculation of the annual maintenance cost, the annual interruption cost and the annual operation cost of the power transformer. With the adoption of the method, the life data of equipment can be effectively utilized, a prediction result is reasonable, and the method has the guiding significance to operation and maintenance decisions as well as planning and transformation of future transformer substations.