Method and device for determining residual magnetism of transformer, storage medium and program product

The invention discloses a residual magnetism determination method and device of a transformer, a storage medium and a program product. The method comprises the following steps: acquiring a three-phase current signal of a transformer; based on the three-phase current signal, a target identification phase in a plurality of phases corresponding to the transformer is determined, and the similarity between the residual magnetism of the target identification phase and the residual magnetism of the transformer is greater than a similarity threshold; obtaining a target current signal of a target identification phase; variational mode decomposition is carried out on the target current signal to obtain an approximate entropy sum of the transformer, and the approximate entropy sum is used for representing the stability degree of the target current signal; and analyzing the approximate entropy sum to obtain the target residual magnetism of the transformer. The technical problem that the residual magnetism of the transfor