Investigation on vibration source and transmission characteristics in power transformers

Zhang, Fan; Ji, Shengchang; Shi, Yuhang; Zhan, Cao

doi:10.1016/j.apacoust.2019.03.011

Cited by 25 publications

(13 citation statements)

References 19 publications

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“…In the literature [2,6,7], the transmission of the vibrations from the internal structure (transformer active part) to the transformer tank is studied. The experiments on the 110 kV power transformer with and without cooling oil are carried out in the paper [2].…”

Section: Introductionmentioning

confidence: 99%

“…The significant vibration harmonics of the transformer tank are not necessarily due to the intense vibrations of the excitation, but a relatively high magnitude of transmission response at these harmonic frequencies might be a cause. The paper [7] reports an investigation on the internal vibration source of power transformer through experimental modal analysis of the windings. The conclusions state that the winding vibrations are strongly coupled with the core vibrations, but the core vibrations are hardly affected by the winding vibrations.…”

Section: Introductionmentioning

confidence: 99%

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Grid-like Vibration Measurements on Power Transformer Tank during Open-Circuit and Short-Circuit Tests

Petrović¹,

Petošić

Župan³

2022

Energies

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In this work, the vibrations on the surfaces of the tank wall, stiffeners, and the cover of a 5 MVA transformer experimental model were measured during open-circuit and short-circuit transformer tests. Vibration measurements of a transformer tank side were conducted at discrete points using two different voltage sources in no-load test. Using interpolation functions, the RMS values of acceleration and vibration velocity are visualized and compared for each considered measurement configuration (no-load and load tests and two different excitation sources). Significant differences in mode shapes and amplitudes of vibrations at different frequencies are observed. The maximum RMS values of acceleration, velocity and displacement in the open-circuit test are 0.36 m/s2, 0.31 mm/s, and 0.42 µm, respectively. The maximum values in short-circuit test are 0.74 m/s2, 1.14 mm/s, and 1.8 µm, respectively. In the short-circuit test, the frequency component of 100 Hz is dominant. In the open-circuit test, the first few 100 Hz harmonics are significant (100 Hz, 200 Hz, and 300 Hz). In addition to the visualization of RMS values during the open-circuit and short-circuit tests, animations of the vibrations are created. Fourier analysis and phase comparison between frequency components are also used to show vibration animations at dominant frequencies in the spectrum (100 Hz harmonics). The visualization of the vibrations at the tank wall surfaces is transferred into 3D space in such a way that all 15 surfaces are mapped to the spatial coordinates of the surfaces so that a 3D model of the acceleration, vibration velocity, and displacement of the transformer tank is shown.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Grid-like Vibration Measurements on Power Transformer Tank during Open-Circuit and Short-Circuit Tests

Petrović¹,

Petošić

Župan³

2022

Energies

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“…On the other hand, an amorphous alloy is characterized by a larger magnetostriction coefficient and is sensitive to stress [4,5]. Therefore, amorphous alloy transformer acoustic noise mainly results from the iron core, winding, and other ancillary structural components, among which transformer winding contributes more noise [6,7].…”

Section: Introductionmentioning

confidence: 99%

Measurement Analysis and Improvement of Vibroacoustic Characteristics of Amorphous Alloy Transformer

Liu¹,

Zhang²,

Wu³

et al. 2022

Energies

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The amorphous alloy transformer has a smaller coercive force and lower specific iron loss. It precedes the conventional silicon steel sheet transformer from the perspective of energy conservation. However, amorphous alloy material has a more significant magnetostriction coefficient, resulting in stronger vibration and acoustic noise. This paper investigates the measurement, analysis, and improvement of vibroacoustic characteristics of one three-phase, four-frame amorphous alloy distribution transformer to reduce environment noise pollution. This study adopts a coupling analysis method of magnetic–force–acoustic multi-physical fields to analyze the vibroacoustic characteristics. It then introduces a novel combination method of magnetic field analysis and an electric circuit to improve the efficiency of magnetic field analysis. This new combination method can greatly reduce the solution time of multiple physical fields through comparison with the traditional field-circuit coupling method. Different from other studies, this paper studies the acoustic and vibration characteristics of an amorphous alloy transformer under both no-load and load conditions. It is found that the load vibration noise of an amorphous transformer is more severe than that of a traditional silicon steel transformer. Accordingly, the study measures the vibroacoustic characteristic with different excitations and load levels under different working conditions to verify the numerical analysis method. Furthermore, according to the analysis results, this paper suggests a few vibration and noise control strategies. In conclusion, the paper deduces an essential basis for exploring strategies of vibration reduction and noise control for amorphous alloy distribution transformers.

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“…The vibration of core discs and air gaps, caused by electromagnetism and magnetostriction, can be transmitted to the oil tank through both solid and liquid paths, and then the vibration of the oil tank causes the external air vibration to produce noise [2]. When a reactor is connected to an inverter power supply, the noise from the reactor is loud because of the harmonics generated by the inverter [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of the temperature increase in oil-immersed electric reactor on the stress loss of the fastening rods of core limb

Jin¹,

Jingkai²,

Han³

et al. 2022

Vib. proced.

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The noise and vibration of large oil-immersed reactor is usually controlled and reduced by using high-strength pretensioned steel rods to fasten iron cores. But the effect of uneven temperature increase in the reactor on the pretension relaxation of steel rods is rarely discussed in previous literatures. A combined fastening device of high-strength steel rod and disc spring is designed to conduct temperature experiment in this paper. And three-dimensional (3D) finite element model is developed to reproduce the experiment process. After the numerical simulation method is verified, finite element analysis of a real BKD-6700/20 oil-immersed reactor is performed. The prestress loss proportion of the high-strength pretensioned steel rods in the oil-immersed reactor under practical operating state is 17.91 % owing to its uneven temperature rise, which can result in significantly weakening of its vibration and noise reduction function.

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Investigation on vibration source and transmission characteristics in power transformers

Cited by 25 publications

References 19 publications

Grid-like Vibration Measurements on Power Transformer Tank during Open-Circuit and Short-Circuit Tests

Grid-like Vibration Measurements on Power Transformer Tank during Open-Circuit and Short-Circuit Tests

Measurement Analysis and Improvement of Vibroacoustic Characteristics of Amorphous Alloy Transformer

Effect of the temperature increase in oil-immersed electric reactor on the stress loss of the fastening rods of core limb

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