Numerical Calculation of Vibration Characteristics of Transformer Core under Inter-harmonics

Abstract

Abstract In this paper, a numerical model that can simulate the vibration of the transformer core under arbitrary inter-harmonic excitation is established. On this basis, the influence of interharmonics on core vibration is studied. First, based on the multi-physics coupling software, by deriving the differential equations of the physical fields, a coupling model of the circuit, magnetic field and solid mechanics is established. Then the magnetostriction curve is used to calculate the magnetic flux density and vibration displacement of the transformer core model under power frequency sine and interharmonic excitation. The work of this paper lays a theoretical foundation for studying the vibration problems of power transformers and other equipment under inter-harmonics.