Analysis of Properties Characteristic for Acoustic Emission Signals Recorded On-Line in Power Oil Transformers

Witos, F.; Olszewska, A.; Szerszeń, Grzegorz

doi:10.12693/aphyspola.120.759

Cited by 10 publications

(5 citation statements)

References 14 publications

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“…Additional external distortion reduction was achieved by a differential output applied in the AE sensor. A sampling rate of the measuring interface was set to 1 MHz, which allowed to register signals in the range from 20 kHz to 500 kHz -according to the authors' personal experience and other publications, it is a relevant band for acoustic PD measurements (Głowacz, Głowacz, 2017;Shang et al, 2017;Witos et al, 2011). A constant clamp force and repeatable sensor and tank coupling were achieved by a dedicated magnetic grip applied additionally for measurements.…”

Section: Methodsmentioning

confidence: 99%

Archives of Acoustics

Kunicki

Cichoń

2018

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An alternative method for analysis of acoustic emission (AE) signals generated by partial discharges (PD), based on a correlation between voltage phase run and AE pulses, so called phase resolved PD pattern (PRPD), is presented in the paper. PRPD pattern is a well-known analysis tool commonly used in such PD diagnostic methods as conventional electrical and UHF ones. Moreover, it yields various signal analysis abilities and allows a direct correlation indication between measurement results achieved using different methods. An original PRPD measurement methodology applied for AE method as well as some exemplary measurement results and further data analysis capabilities are presented in the paper. Also a comparative analysis of PRPD patterns achieved using various measurement methods and different PD source configurations have been investigated. All presented experiments were done under laboratory conditions using PD model sources immersed in the insulation oil. The main purpose of the presented research is to indicate an all-embracing analytical tool that yields an ability to direct comparison (qualitative as well as quantitative) of the AE measurement results with other commonly applied PD measurement methods. The presented results give a solid fundamental for further research work concerning a direct correlation method for AE and other described in the paper diagnostic techniques, mainly in order to continue PD phenomena analysis and assessment in real life high voltage apparatus insulation systems under normal onsite operation conditions.

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Section: Methodsmentioning

confidence: 99%

Archives of Acoustics

Kunicki

Cichoń

2018

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“…These descriptors calculated for AE signals recorded on the side walls of power transformer tanks are the input data for determination of descriptor maps. In turn, the AE descriptor maps (Olszewska, Witos, 2012;Witos et al, 2011) calculated in a defined frequency band are the basis of the way of location of PD sources in oil power transformers. Such the method of location of PD sources in power transformers has been the patent application .…”

Section: Descriptors Adc Adp and Adnc As Parameters Of Acoustic Emiss...mentioning

confidence: 99%

Archives of Acoustics

Witos

2019

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In the paper, the results of investigations on the properties of acoustic emission signals generated in a tested pressure vessel are presented. The investigations were performed by repeating several times the following procedure: an increase in pressure, maintaining a given pressure level, a further increase in pressure, and then maintaining the pressure at new determined level. During the tests the acoustic emission signals were recorded by the measuring system 8AE-PD with piezoelectric sensors D9241A. The used eight-channel measuring system 8AE-PD enables the monitoring, recording and then basic and advanced analysis of signals.The results of basic analysis carried out in domain of time and the results of advanced analysis carried out in the discrimination threshold domain of the recorded acoustic emission signals are presented in the paper.In the framework of the advanced analysis, results are described by the defined by the author descriptors with acronyms ADC, ADP and ADNC. Such description is based on identifying the properties of amplitude distributions of acoustic emission signals by assigning them the level of advancement. It is shown that for signals including continoues AE or single burst AE signals descriptions of such registered signals by means of ADC, ADP and ADNC descriptors and by Upp and Urms descriptors provide identical ordering of registered acoustic emission signals. For complex signals, the description using ADC, ADP and ADNC descriptors based on the analysis of amplitude distributions of recorded signals gives the order of signals with more accurate connection with deformational processes being sources of acoustic emission signals.

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“…For the last few decades the AE method has been recognized as one of the most popular and effective technical diagnostic methods. The AE phenomenon is widespread and relatively well described in a contemporary scientific literature (Boczar et al, 2016;Cichoń et al, 2014;Olszewska, Witos, 2016;Witos et al, 2011). Generally the AE phenomenon is based on an ultrasound wave radiation emitted by the source into a springy resilient environment.…”

Section: Introductionmentioning

confidence: 99%

Archives of Acoustics

Kunicki

2019

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The main purpose of the presented research is to investigate the partial discharge (PD) phenomenon variability under long-term AC voltage with particular consideration of the selected physical quantities changes while measured and registered by the acoustic emission method (AE). During the research a PD model source generating surface discharges is immersed in the brand new insulation mineral oil. Acoustic signals generated by the continuously occurred PDs within 168 hours are registered. Several qualitative and quantitative indicators are assigned to describe the PD variability in time. Furthermore, some longterm characteristics of the applied PD model source in mineral oil, are also presented according to acoustic signals emitted by the PD. Finally, various statistical tools are applied for the results analysis and presentation. Despite there are numerous contemporary research papers dealing with long-term PD analysis, such complementary and multiparametric approach has not been presented so far, regarding the presented research. According to the presented research from among all assigned indicators there are discriminated descriptors that could depend on PD long-term duration. On the grounds of the regression models analysis there are discovered trends that potentially allow to apply the results for modeling of the PD variability in time using the acoustic emission method. Subsequently such an approach may potentially support the development and extend the abilities of the diagnostic tools and maintenance policy in electrical power industry.

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Analysis of Properties Characteristic for Acoustic Emission Signals Recorded On-Line in Power Oil Transformers

Cited by 10 publications

References 14 publications

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