Power transformer mechanical condition assessment with a vibration-based diagnostic method

Žižins-Mališevs, Sergejs; Poiss, Gints

doi:10.1109/rtucon.2015.7343160

Cited by 7 publications

(4 citation statements)

References 1 publication

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“…For this large power transformer vibration measurement results on tank surface are available in the study [11]. Continued research after a year showed that the values of vibration velocity exceed the given limit of 20 mm/s 2.5 times.…”

Section: Case Studymentioning

confidence: 98%

Modelling of magnetostriction of transformer magnetic core for vibration analysis

Marks

Vītoliņa

2017

Open Physics

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Magnetostriction is a phenomenon occurring in transformer core in normal operation mode. Yet in time, it can cause the delamination of magnetic core resulting in higher level of vibrations that are measured on the surface of transformer tank during diagnostic tests. The aim of this paper is to create a model for evaluating elastic deformations in magnetic core that can be used for power transformers with intensive vibrations in order to eliminate magnetostriction as a their cause. Description of the developed model in Matlab and COMSOL software is provided including restrictions concerning geometry and properties of materials, and the results of performed research on magnetic core anisotropy are provided. As a case study modelling of magnetostriction for 5-legged 200 MVA power transformer with the rated voltage of 13.8/137kV is conducted, based on which comparative analysis of vibration levels and elastic deformations is performed.

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Section: Case Studymentioning

confidence: 98%

Modelling of magnetostriction of transformer magnetic core for vibration analysis

Marks

Vītoliņa

2017

Open Physics

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“…In practice, this means that in a particular mechanical configuration of prosthesis or rehabilitation unit, such actuators will under-generate or over-generate vibrations. Quite rare alternative actuators of other types (voice coil motor-derived-orange curve) provide maximal mechanical output at the frequency which corresponds to the mechanical resonance of this particular actuator, according to the Equations (18) and (19). This leads to the same consequencesin the case of particular configuration of prosthesis, they under-generate or over-generate vibrations.…”

Section: Comparative Evaluation Of Existing and Proposed 3d Printed Vmentioning

confidence: 99%

“…For example, analyze the audibly detectable vibrations of an on-load tap changer which followed linear movements [17]. Analyze the vibrations of a power transformer which did not include explicit moving parts but produced vibrations directly due to a strong electromagnetic field [18].…”

Section: Typical Use Of Vibrations In Techncial Diagnisticsmentioning

confidence: 99%

Customized Vibration Generator for State of Health Monitoring of Prosthetic Implants and Pseudo-Bionic Machine–Human Feedbacks

et al. 2019

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Modern industrial, household and other equipment include sophisticated power mechanisms and complicated control solutions that require tighter human–machine–human interactions to form the structures known as cyber–physical–human systems. Their significant parts are human–machine command links and machine–human feedbacks. Such systems are found in medicine, e.g., in orthopedics, where they are important for the operation and functional abilities of orthopedic devices—wheelchair, prosthesis, rehabilitation units, etc. The mentioned feedbacks may be implemented based on the haptic perceptions that requires vibration actuators. In orthopedics, such actuators can be used also for diagnostic purposes. This research brings forward the idea of the use of 3D printing in conjunction with high quality permanent magnets. This allows for the achievement of better efficiency, smaller size, and the developing of actuators individually for particular circumstances. The obtained simulation, experimental data, and data about 3D manufacturing generally confirm the above hypothesis. In particular, the stiffness coefficient of the actuator’s membrane and attached mass, which can be changed easily during 3D printing, affects the frequency of maximal power output. Secondly, the 3D manufacturing process is quick, tunable and rather cheap. Finally, an elaboration of the design of the actuator that allows for the real-time modification of stiffness and mass in a program way is planned for future works.

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“…Transformatörlerde meydana gelebilecek herhangi bir mekanik arızanın belirlenmesinde titreşim-tabanlı tanılama, detaylı bilgi sağlamasından dolayı yaygın kullanılan metotlardan biridir [10]. Bu nedenle literatürde transformatörlerin titreşim analizlerine yönelik yapılan çalışmalar da gittikçe artmaktadır.…”

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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Power transformer mechanical condition assessment with a vibration-based diagnostic method

Abstract: Vibrations are caused by electrodynamic forces and the effect of a fault can be detected by measuring the vibration level. Vibration-based diagnostic method which is used in Latvenergo and measured vibration results as case studies are presented in this paper.

Cited by 7 publications

References 1 publication

Modelling of magnetostriction of transformer magnetic core for vibration analysis

Modelling of magnetostriction of transformer magnetic core for vibration analysis

Customized Vibration Generator for State of Health Monitoring of Prosthetic Implants and Pseudo-Bionic Machine–Human Feedbacks

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

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