Analysis of Load Noise Components in Small Core-Form Transformers

Yoshida, Keiko; Hoshino, Takashi; Murase, Seiichi; Murakami, Hiroshi; Miyashita, Tatsuya

doi:10.1109/tpwrd.2020.3025816

Cited by 6 publications

(3 citation statements)

References 16 publications

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“…In other words, the complex geometry and physics of the transformer core and the windings are observed as a black box in this work. Significant work in numerical modeling of transformer core and windings with limitations and simplifications is presented in [16][17][18][19][20][21]. The goal of this paper is to provide a physical background and visualize vibrations to be able to compare transformer vibration response at different conditions, estimate sound pressure levels around the transformer, and give a solid basis for the future verification of numerical modeling.…”

Section: Theoretical Considerationsmentioning

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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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: Theoretical Considerationsmentioning

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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“…Measurement of the vibration of sources (windings and core) can be used as validation of finite element method (FEM) models that can be used as noise prediction tools. [4][5][6][7][8] On the other hand, measurements of the vibrations on the tank wall are more straightforward and accessible, and they can be used as a direct input for the noise modelling software.…”

Section: Introductionmentioning

confidence: 99%

Sound pressure level determination around the transformer using coherent and incoherent analytical summation methods

Petrović,

Petošić,

Župan

2024

Noise & Vibration Worldwide

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In this paper, coherent and incoherent analytical summation methods from elementary sound sources on the transformer’s tank are presented. They aim to determine a one-third-octave spectrum of sound pressure levels (SPL) in points around the transformer. Each part of the transformer’s surface is treated as a separate plane source so the analytical calculation can be applied to find SPL in the surroundings. Reflections from the ground are also considered by putting an image of the plane sources on the other side of the reflecting plane and adding its contributions to the total pressure in the desired points. Grid-like vibration measurements of vibration velocity on the tank surfaces are used as input parameters. Vibrations and sound pressure levels are measured to validate the method on the 5 MVA transformer experimental object. The SPL around the transformer in short-circuit (SC) and open-circuit (OC) tests is measured in the semi-anechoic chamber to compare it with theoretical results. By analyzing the results, the coherent calculation with reflection provided the most accurate results. In the SC operating condition, the normalized root mean square error (NRMSE) is 17.2%, and in the OC operating condition, it is 10.9%. The novelty of the presented method is that it considers complicated transformer geometry where each surface is calculated as a separate noise source. It calculates noise at a distance from the elementary vibration sources, considering phase and reflection from the hard ground, and provides detailed noise maps that can be used for noise modeling around the substations.

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“…The electromagnetic vibration of converter transformers is caused by harmonics that are generated by thyristors in the HVDC system, which is the main cause of noise pollution [17,18]. If both the current and voltage harmonics flowed through the converter transformer can be suppressed effectively, the vibration of windings and iron core will be reduced to a lower level, respectively [19].…”

Section: Introductionmentioning

confidence: 99%

Capacitive Filter Based HVDC Converter for Reducing the Vibration and Noise of Converter Transformer

Zhao

Luo

et al. 2022

IEEE Access

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Harmonic currents generated by converters in the HVDC system flow into the converter transformer. The harmonic current and voltage in the converter transformer will cause electromagnetic vibration of windings and iron core, which result in serious noise pollution, power loss and electrical stressing. In this paper, a capacitive filter based HVDC converter is proposed to reduce the vibration and noise of converter transformer. First, the topology of the HVDC system is introduced, and its harmonic characteristics are analyzed. Then, the noise reduction mechanism by using capacitive filter is revealed by analyzing the relationship among harmonics, vibration, and noise of the converter transformer. Finally, the experimental platform of the capacitive filter based HVDC system is built. Moreover, the vibration and noise of the converter transformers are measured in a semi-anechoic chamber, with the use of line-commutated converter (LCC) and capacitive filter based HVDC converter respectively. The experimental results show that the vibration and noise of converter transformer using the capacitive filter are significantly suppressed compared with that using the LCC.

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Analysis of Load Noise Components in Small Core-Form Transformers

Cited by 6 publications

References 16 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

Sound pressure level determination around the transformer using coherent and incoherent analytical summation methods

Capacitive Filter Based HVDC Converter for Reducing the Vibration and Noise of Converter Transformer

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