When DC current flows through the windings

the exciting current of the transformer will be distorted

thetemperature and vibration amplitude of the core and component in transformer will increase. The basic concept

cause and harm of DC magnetic bias are introduced in this article. The effects of DC magnetic biasing to transformerare summarized in three aspects:exciting current

temperature rise and loss

vibration and noise. From perspectivesof models and research methods

the developments and results of DC magnetic bias studied by scholars both at homeand abroad are demonstrated

and the research methods of experiments and simulations for each aspect were dis-coursed. The shortcomings of study progress on DC magnetic bias influences are discussed

and possible develop-ment directions are proposed.