Study on Vibration Characteristics of Power Transformer Core and Oil Tank and the Correlation with Near Field Noise

The noise of the transformer is mainly generated by the vibration of the oil tank, which is mainly generated by the vibration of the iron core, while the vibration of the iron core is mainly generated by the electromagnetic force. In order to study the correlation among ferromagnetic force, core vibration, oil tank vibration and near field noise. In this paper, the electromagnetic force of transformer in different direction under different voltage is simulated by using virtual work method, the vibration state of the core is analyzed by finite element method. And the vibration characteristics of the core and oil tank in different directions under different voltages and the near field noise characteristics of the transformer were tested by using acceleration sensors. At last the transmission process of core vibration is discussed. The results show that the magnitude, direction and frequency of ferromagnetic force are obviously correlated with the vibration of ferromagnetic core, the vibration of oil tank and the noise of transformer near field.