Analysis of Acoustic Wave Propagation in a Power Transformer Model

Wotzka, Daria; Boczar, T.; Zmarzły, D.

doi:10.12693/aphyspola.116.428

Cited by 40 publications

(16 citation statements)

References 11 publications

(11 reference statements)

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“…The AE method has been studied for 25 years [35], in particular in Poland, Brazil and Taiwan, to determine partial discharge impact [35][36][37][38]. Various physical phenomena accompany the occurrence and development of partial discharges (PDs) in insulation systems.…”

Section: Acoustic Emission Methodsmentioning

confidence: 99%

Determination of transformer oil quality by the acoustic method

2017

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Abstract. Large power transformers are the most expensive and strategically important components of any power generation and transmission system. Their reliability has crucial importance for the energy system operation. Insulation breakdown can generate a serious failure of a large power transformer, which causes substantial costs to repair and financial loss due to power outage. Most power utilities are, therefore, highly motivated to assess the actual condition of the transformer insulation system. The majority of transformer condition check methods are only available for off-line periodic diagnostics. The acoustic emission (AE) method as a complex online diagnostics technique to identify evolving failures is proposed. Results of measuring the acoustic signals generated by the presence of impurities in transformer oil and determining the impurities influence on its condition as an indicator of the transformer condition is presented.

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Section: Acoustic Emission Methodsmentioning

confidence: 99%

Determination of transformer oil quality by the acoustic method

2017

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“…Based on measurements and results analysis of AE signals generated by PD in oil insulation [4] a mathematical model for the AE signal was proposed. In general, the AE signal is generated by a number of single PD pulses, which occur in series (and/or simultaneously), in a small region, close to each other, in a time interval shorter than 1 µs [2,7].…”

Section: Mathematical Model Of Ae Wave Generated By Pds In Insulatingmentioning

confidence: 99%

“…Among other methods in the PD diagnosis the acoustic emission method, which is based on measurement and analysis of signals registered by use of acoustic emission (AE) sensors, is frequently applied [1,2]. Thus propagation phenomena of acoustic waves generated by PDs are currently widely studied [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Mathematical Model and Numerical Analysis of AE Wave Generated by Partial Discharges

2011

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Paper presents definition of a mathematical model describing acoustic emission signals generated by partial discharges occurring in oil immersed electric power transformers. Time runs, power spectral density graphs and spectrograms of acoustic emission signals generated in experiments, performed under laboratory conditions, and of equivalent signals, calculated on the basis of the mathematical model, are presented. Furthermore, results of numerical simulations of acoustic pressure distribution inside a tank filled with insulation oil are presented in the paper. In the center of the tank acoustic emission wave sources were placed, each generating signals described by the model developed.

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“…Considered model assumes definition of the Lagrange finite elements of order two (quadratic elements with polynomial shape function) with one dependent variable that relates to the acoustic pressure p [Pa]. Detailed information about governing equations can be found in [8][9][10].…”

Section: Software Applied For Numerical Calculationsmentioning

confidence: 99%

“…Within the scope of the authors' research works a number of numerical simulations have been performed [8][9][10][11][12]. Beginning with simplified models -one of them presented in this paper -sophisticated models are to be created and analyzed.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Acoustic Wave Propagating in a Spherical Object Filled with Insulating Oil

2010

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Results of a numerical simulation of an acoustic wave that propagates in a spherical object filled with insulating oil are presented in the paper. The sinusoidal acoustic wave is generated by an electro-acoustic transducer mounted in the middle of the object. Presented results depict acoustic pressure distribution within the transient and the steady states in a two-dimensional object. Furthermore, comparison of short time simulations adapting different mesh element size is presented.

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Analysis of Acoustic Wave Propagation in a Power Transformer Model

Cited by 40 publications

References 11 publications

Determination of transformer oil quality by the acoustic method

Determination of transformer oil quality by the acoustic method

Mathematical Model and Numerical Analysis of AE Wave Generated by Partial Discharges

Numerical Simulation of Acoustic Wave Propagating in a Spherical Object Filled with Insulating Oil

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