Feature extraction method for the degradation of transformer winding structures based on empirical wavelet transform

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (14) : 89-95.

HONG Kaixing1，ZHANG Juntao1，XU Su’an1，HUANG Hai2

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Abstract

According to the physical structure of transformer windings, a multi-degree-of-freedom mathematical model was established, and the analytical solution of the free vibration of windings was obtained.The relationship between the structural parameters and the winding condition was also established.Based on this, empirical wavelet transform was used to extract the vibration decay curves corresponding to different natural frequencies, and Hilbert transform was used to extract the mechanical parameters.In the experiment, a three-phase 110 kV transformer winding unit was adopted as an object.The process of winding structure degradation was simulated by adjusting the clamping force, and the vibration responses at different locations were collected after a mechanical impulse was applied.The experimental results show that the modal information of the winding structure can be obtained quickly and effectively by empirical wavelet transform, and the structural parameters contained in the impulse vibration responses can distinguish the state of winding structure correctly.In the field test, the vibrations produced in the switched-off process were compared and analyzed for the transformers under different conditions.The results show that the proposed feature extraction method for the winding structure not only has clear physical meaning, but also has important engineering application value.

Key words

transformer windings / impact response / empirical wavelet transform / structural degradation

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HONG Kaixing1，ZHANG Juntao1，XU Su’an1，HUANG Hai2. Feature extraction method for the degradation of transformer winding structures based on empirical wavelet transform[J]. Journal of Vibration and Shock, 2019, 38(14): 89-95

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