Electromagnetic vibration analysis method of short circuit in transformer winding based on field circuit coupling

The short circuit fault may cause serious deformation of the transformer winding even affect the safety and stability of the equipment and the whole power system. This paper mainly studies the flux leakage, electromagnetic force and vibration characteristics of winding under short-circuit fault based on field circuit coupling model. Firstly, the 10kV power transformer is modeled as the research object to analyze the flux leakage and electromagnetic force of the transformer windings in short circuit condition based on the field-circuit coupling principle. Then, the electromagnetic excitation is extracted for harmonic response analysis to investigate the electromagnetic vibration characteristics of the windings. Finally, the short circuit experiment is designed to verify the above research. It is found in this paper that the flux leakage, electromagnetic force and vibration amplitude of the transformer windings are all strengthened sharply under short circuit fault. This conclusion provides an important basis for transformer design and condition. (paper)