Life cycle pre-maintenance prompting liquid immersion type digital distribution transformer and maintenance method

The invention relates to a life cycle pre-maintenance prompt liquid immersion type digital distribution transformer and a maintenance method, and the method comprises the steps: arranging a sensor monitoring unit and a data analysis and transmission unit at the periphery of the transformer, and building a parameter calculation model which is difficult to directly measure on a monitoring platform; data such as the oil level, the oil surface temperature, the winding temperature, the electrical life, the three-phase imbalance rate and the power factor of the transformer are collected in the operation process of the transformer, the state and the residual life of the transformer are calculated according to the collected data and the established model, and comprehensive monitoring of the operation working state of the distribution transformer is achieved. Meanwhile, a pre-maintenance reminding threshold value is set according to the electrical life loss trend, maintenance reminding information can be sent to a bou