Method and device for monitoring abnormal state of oil-immersed transformer

The invention provides a method and a device for monitoring an abnormal state of an oil-immersed transformer, and relates to the technical field of operation monitoring of oil-immersed transformers. The method comprises the steps of firstly obtaining an oil temperature data set and a plurality of state data sets; constructing a first oil temperature matrix and a plurality of first state matrixes according to the oil temperature data set and the plurality of state data sets; then, according to the first oil temperature matrix and the multiple first state matrixes, correlation values representing correlation between the oil temperature and the multiple monitoring indexes are calculated, and the multiple obtained correlation values are constructed into correlation vectors; and finally, determining the state of the transformer according to the distinction degree of the association vector and the multiple sample association vectors. According to the embodiment of the invention, the features of the data set are hig