Diagnosing winding and core condition of power transformer by vibration signal analysis

Munir, Buyung Sofiarto; Smit, J.J.; Rinaldi, I G. M. Rama

doi:10.1109/cmd.2012.6416170

Cited by 13 publications

(12 citation statements)

References 6 publications

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“…Significantly more papers deal with transformer core/ windings vibration analysis in the frequency domain [10], [16], [17], [48]- [55]. Here, their conclusions and contributions are summarised.…”

Section: ) Core/windingsmentioning

confidence: 99%

“…Core vibrations caused by magnetostriction are non-linearly proportional to the applied voltage while the winding vibrations are non-linearly proportional to the current. Munir et al [48] reported the dependency of vibrations to the square of the current, while Aidi et al [52] found that the nonlinear properties of the insulation between the windings make the relation closer to the cubic representation. To separate the core (magnetostriction) and windings (Lorentz forces) vibrations it is best to do the measurements under no-load and under normal loading conditions [17] because the vibrations under normal loading are caused by both of those phenomena.…”

Section: ) Core/windingsmentioning

confidence: 99%

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Vibro-Acoustic Methods in the Condition Assessment of Power Transformers: A Survey

2019

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It has been over two decades since the publication of pioneer works about the power transformer diagnostics based on monitoring of their acoustic fingerprints. Since then, there has been great progress in this field and the methods used are as complex as ever. Any unnecessary intervention on a power transformer implies its temporary disconnection from the power grid. The inability to supply electricity to the customer means not only financial loss for the utility but also generates a non-material loss, e.g., the loss of reputation to the customer. Faster, more accurate, more reliable, and less invasive diagnosis is the main reason behind development and improvement in this field. The main goal of this paper is to categorize and review state-of-the art of vibro-acoustic diagnostic methods for power transformers. This paper opens with a brief note about continuous condition monitoring, after which we overview the causes of transformer vibrations as well as the collection and preprocessing of diagnostic data. Then, we review and categorize works related to the acoustic condition assessment of power transformers considering both: feature extraction in the time, frequency, time-frequency domain, and mathematical modeling and system identification of dynamic systems.

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Section: ) Core/windingsmentioning

confidence: 99%

Section: ) Core/windingsmentioning

confidence: 99%

Vibro-Acoustic Methods in the Condition Assessment of Power Transformers: A Survey

2019

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“…Dimana, Plaintext (M) adalah pesan yang hendak dikirimkan (berisi data asli), Chipertext (C) adalah pesan ter-enkrip (tersandi) yang merupakan hasil enkripsi, Enkripsi adalah proses pengubahan plaintext menjadi Ciphertext, Dekripsi adalah kebalikan dari enkripsi yakni mengubah Ciphertext menjadi plaintext, sehingga berupa data awal/asli, dan Kunci adalah suatu bilangan yang dirahasiakan yang digunakan dalam proses enkripsi dan dekripsi. Hal-hal tersebut merupakan dasar dari struktur enkripsi dekripsi seperti pada gambar 1 [5] . …”

Section: Kriptografiunclassified

Implementasi Metode Algoritma KVC Untuk Pengamanan Pesan

Achsanty

Abrianto

Wiliani

2018

jurasik

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“…Transformatörlerin titreşim analizleri ağırlıklı olarak yüksüz durumdaki nüve titreşimi ya da belirli doğrusal yük seviyelerinde veya kısa devre durumundaki titreşim analizleri şeklindedir. Ancak bu çalışmalar genelde nüve ve/veya sargıların mekanik/gevşeklik durumlarına göre [11][12][13][14][15][16][17], bu durumlara ek olarak sargı yalıtım malzemelerinin yıpranma durumlarına göre [19] yapılmaktadır. Yüklü çalışma durumlarında ise genellikle çeşitli seviyelerdeki doğrusal yükler incelemektedir.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Doğrusal Olmayan Yük Koşullarında Çalışan Kuru Tip Transformatörlerin Titreşim Etkileri Üzerine Bir Analiz

Battal¹,

Sefa²,

Balci³

2019

Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım Ve Teknoloji

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The use of non-linear loads in transformers leads to increased losses, heat and more vibration and noise are generated. Vibrations should be investigated because they cause to decrease the nominal values of the transformer and its service life. Figure A shows the variation of core vibration with respect to these harmonic components with current harmonic components of linear load, 3-phase and 1-phase rectifier, respectively. Figure A. Signals obtained according to load condition a) current harmonic spectrum, b) axial acceleration harmonic spectrum Purpose: It is aimed to investigate the vibration signals of a dry type isolation transformer core which operates different load conditions. Theory and Methods: Transformer and loads are modelled and simulated by using ANSYS Maxwell and Simplorer. And then core forces obtained from Maxwell are used as input parameters in ANSYS Mechanical. Finally, vibration signals as harmonic responses are obtained. Results: Increase in the THD value leads to an increase in the number and amplitude of vibration harmonic components. With the increase in the THD value, the second and third harmonic components of the vibration have increased in amplitude. It has been shown that the increase of the THD value caused by using the 1-phase rectifier leads to only the increase of the peak value amplitude in the radial force frequency spectrum, there is no similar increase in the axial force frequency spectrum. Conclusion: The increase of the THD value, the fundamental components of the vibration signals in the axial direction the second and third harmonic component amplitudes are increased. Also, the increase in THD value has led to a greater number of regional maximum points depending on the grades of the harmonic currents in the vibration frequency spectrum. Vibration signals must be carefully monitored since vibrations in the axial direction may cause a failure such as core deformation on the transformer.

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Diagnosing winding and core condition of power transformer by vibration signal analysis

Cited by 13 publications

References 6 publications

Vibro-Acoustic Methods in the Condition Assessment of Power Transformers: A Survey

Vibro-Acoustic Methods in the Condition Assessment of Power Transformers: A Survey

Implementasi Metode Algoritma KVC Untuk Pengamanan Pesan

Doğrusal Olmayan Yük Koşullarında Çalışan Kuru Tip Transformatörlerin Titreşim Etkileri Üzerine Bir Analiz

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