Vibration and noise characteristics of high-frequency amorphous transformer under sinusoidal and non-sinusoidal voltage excitation

Zhang, Pengning; Lü, Lin

doi:10.1016/j.ijepes.2020.106298

Cited by 21 publications

(8 citation statements)

References 17 publications

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“…The magnetic ring model of nanocrystalline strip with and without air gap was excited with a sinusoidal voltage of 5 kHz, and the peak magnetic density was 0.5 T. The relationship between voltage V m and magnetic flux density B m is determined by formula (1). The magnetostriction coefficient of nanocrystalline alloy is 0.02ppm (Zhang and Li, 2020), and the B–H curve of nanocrystalline alloy is shown in Figure 3, and its saturation magnetic density is close to 1.2 T: where N is the number of winding turns; f is the frequency; S is the effective cross-sectional area of the core; and K c is the filling coefficient.…”

Section: Vibration Mechanism Analysis Of Nanocrystalline Stripmentioning

confidence: 99%

Measurement and analysis of vibration characteristics of nanocrystalline magnetic core under symmetrical/asymmetrical waveforms

Chen

Wan³

et al. 2023

COMPEL

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Purpose Because the nanocrystalline core is widely used in power electronic equipment, and the excitation waveform of its working mode is complex, the vibration at medium and high frequencies cannot be ignored. Therefore, this study aims to study the vibration mechanism of nanocrystalline strip and the vibration characteristics of nanocrystalline magnetic ring under different excitation waveforms. Design/methodology/approach First, the electromagnetic vibration mechanism between nanocrystalline strips is analyzed by finite element analysis, and the force of the magnetic ring with and without air gap is compared and analyzed. Then, the vibration of nanocrystalline magnetic ring under different excitation waveforms such as sine wave, triangular wave, symmetric rectangular wave and asymmetric rectangular wave is analyzed by experimental method. The acceleration time domain waveform measured by the experiment is analyzed by fast Fourier transform, and the vibration is analyzed according to the spectrum. Findings Because of the increase of magnetic flux leakage, the volume force density and the Maxwell force on the surface of the nanocrystalline magnetic ring will increase after the air gap is opened, resulting in the intensification of vibration. Under symmetric/asymmetric rectangular wave excitation, the vibration acceleration varies with the duty cycle. Due to the influence of harmonic excitation, the relationship between the main frequency of vibration and the excitation frequency is not two times, and its multiple decreases with the increase of excitation frequency. Originality/value The research and analysis of this paper can promote the application of new magnetic materials in electrical equipment in small and medium-sized and medium- to high-frequency fields.

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Section: Vibration Mechanism Analysis Of Nanocrystalline Stripmentioning

confidence: 99%

Measurement and analysis of vibration characteristics of nanocrystalline magnetic core under symmetrical/asymmetrical waveforms

Chen

Wan³

et al. 2023

COMPEL

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“…There is an air gap filled with insulating material between the two U-shaped laminated silicon steel sheets. The primary vibration source of a saturable reactor is the magnetostrictive vibration of the iron core [42]. Under the operating condition of the thyristor valve, the periodic trapezoidal wave-like current passing through the saturated reactor can be equivalent to the sum of multiple sinusoidal currents.…”

Section: Vibration Mechanism Of the Saturable Reactormentioning

confidence: 99%

Research on Vibration Data-Driven Fault Diagnosis for Iron Core Looseness of Saturable Reactor in UHVDC Thyristor Valve Based on CVAE-GAN and Multimodal Feature Integrated CNN

et al. 2022

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The imbalance of data samples and fluctuating operating conditions are the two main challenges faced by vibration data-driven fault diagnosis for the iron core looseness of saturable reactors in UHVDC thyristor valves. This paper proposes a vibration data-driven saturable reactor iron core looseness fault diagnosis strategy named CVG-MFICNN based on CVAE-GAN and MFICNN to overcome the two challenges. This strategy uses a novel 1-D CVAE-GAN model to produce generated samples and expand the training set based on imbalanced training samples. An MFICNN model structure is designed to allow the simultaneous processing of multimodal features such as the SST time-frequency spectrum, time-domain vibration sequence, frequency-domain power spectrum sequence, and time-domain statistics. Using these multimodal features and the MFICNN model, the hidden fault information in vibration data can be effectively mined. An experiment is conducted to collect vibration data of saturable reactors with different faults. Models based on the proposed strategy and other methods are trained and tested using the collected data. The comparison results show that the performance of the proposed CVG-MFICNN approach is significantly superior to that of single-feature CNNs, traditional machine learning methods, and classical image classification CNNs in the application of UHVDC thyristor valve saturable reactor iron core looseness fault diagnosis.

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“…Amorphous alloy materials possess excellent properties of high permeability and low loss, which can significantly reduce the transformer no-load loss to achieve an energysaving effect [1][2]. However, the magnetostriction of amorphous alloy material is more significant than that of silicon steel, which leads to more obvious vibration and noise [3][4][5]. The planar wound core (PWC) and the threedimensional wound core (TDWC) are the most common core structures of amorphous alloy transformers, and their characteristics are shown in Table I.…”

Section: Introductionmentioning

confidence: 99%

Magnetostrictive Vibration Characteristics of Amorphous Alloy Transformer With Three-Dimensional Wound Core

Song,

Han,

Yang

et al. 2024

IEEE Access

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The amorphous alloy transformer with three-dimensional wound core (TDWC) is a new type of transformer structure. Compared with the traditional three-phase five-column transformer with planar wound core (PWC), the TDWC structure exhibits a fully symmetrical magnetic circuit, resulting in enhanced short-circuit withstand capability. However, the vibration noise of the core becomes a significant engineering challenge in the design and manufacturing process due to the larger magnetostrictive coefficient of the amorphous alloy. This study establishes a magnetic-mechanical coupling mathematical model for amorphous alloy TDWC considering the magnetostrictive effect. Three-dimensional finite element analysis (FEA) is adopted to calculate the flux and vibration displacement distribution of the TDWC. Additionally, an experimental validation is conducted on a 200kVA amorphous alloy TDWC prototype to verify the accuracy of the model. Furthermore, a comparison with the PWC prototype demonstrates that the TDWC structure can effectively reduce surface vibrations, and the dominant frequency distribution law of vibration displacement at different positions of the TDWC structure is revealed, providing a foundation for the design of vibration reduction and noise control for TDWC.INDEX TERMS Amorphous alloy; magnetostriction; planar wound core; three-dimensional wound core; vibration characteristics

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Vibration and noise characteristics of high-frequency amorphous transformer under sinusoidal and non-sinusoidal voltage excitation

Cited by 21 publications

References 17 publications

Measurement and analysis of vibration characteristics of nanocrystalline magnetic core under symmetrical/asymmetrical waveforms

Measurement and analysis of vibration characteristics of nanocrystalline magnetic core under symmetrical/asymmetrical waveforms

Research on Vibration Data-Driven Fault Diagnosis for Iron Core Looseness of Saturable Reactor in UHVDC Thyristor Valve Based on CVAE-GAN and Multimodal Feature Integrated CNN

Magnetostrictive Vibration Characteristics of Amorphous Alloy Transformer With Three-Dimensional Wound Core

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