Vibration and noise of oil-immersed auto-transformers

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Journal of Vibration and Shock ›› 2019, Vol. 38 ›› Issue (15) : 273-280.

LU Wenbo1, QU Guanglei2

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Abstract

Transformer vibration is mainly caused by magnetostriction of iron core silicon steel sheets.It is always difficult to simulate transformer vibration considering magnetostrictive effect.Here, in order to solve excess noise problem of a certain large oil-immersed auto-transformer, firstly 3-D transient electromagnetic field was solved.Then, the iron core magnetostriction equivalent model was established through comparing the magnetostrictive effect with the thermal one.By interpolating with magnetic flux density of iron core nodes, the magnetostrictive characteristic curve was obtained and applied in the proposed equivalent model to gain iron core magnetostrictive displacements, and realize the magneto-solid coupled calculation.Then, iron core displacements were taken as excitation to calculate vibration of the transformer body.Finally, considering fluid-solid coupling of transformer body-oil-tank, the whole device’s vibration and radiated noise were calculated.It was shown that the calculated results are in good agreement with the test ones to verify the correctness and effectiveness of the proposed method.Based on the established calculation flow path, effects of tank reinforcement, tank wall thickness and tank bottom constraint mode on vibration and noise of the transformer were analyzed.

Key words

transformer / magnetostriction / magneto-solid coupling / fluid-solid coupling / vibration and noise

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LU Wenbo1, QU Guanglei2. Vibration and noise of oil-immersed auto-transformers[J]. Journal of Vibration and Shock, 2019, 38(15): 273-280

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