Characteristic of Acoustic Signals Generated by Operation of On Load Tap Changers

Cichoń, A.; Frącz, Paweł; Zmarzły, D.

doi:10.12693/aphyspola.120.585

Cited by 17 publications

(9 citation statements)

References 4 publications

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“…AE signal generated by operating OLTC consists of series of acoustic events [10] as it can be seen on example of signal registered by hydrophone type 8103. Events present in registered AE are generated by switching sequence taking place during operation of tap selector and power switch.…”

Section: Results Of Measurementsmentioning

confidence: 99%

Selecting Sensor for On Load Tap Changer Contacts Degree of Wear Diagnostics

Cichoń

Borucki

Berger³

2013

Acta Phys. Pol. A

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Results of scientic research works considering selection of measuring transducer applied for registration of acoustic emission signals generated by on load tap changers are presented in the paper. During the coupling process acoustic emission signals are generated by: the mechanical setup of tap changer, contacts operation, and other phenomena. For most on load tap changers types, the working medium is insulation oil in which the acoustic wave being formed propagates to the steal tank. There exists a possibility to register acoustic emission signals with a piezoelectric transducer attached to the outer tank surface or with a hydrophone immersed in the oil. Acoustic emission signal obtained in such manner contains information which describes operation of the power tap changer and the selector. A comparative analysis of acoustic emission signals generated by on load tap changers working under laboratory conditions, with applied measuring transducers with dierent transmittances, is presented in the paper. The comparative analysis was performed in order to determine their suitability for on load tap changers technical condition diagnosis. Based on the results achieved, one transducer which allows the registration of acoustic events generated during on load tap changers operation was selected.

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Section: Results Of Measurementsmentioning

confidence: 99%

Selecting Sensor for On Load Tap Changer Contacts Degree of Wear Diagnostics

Cichoń

Borucki

Berger³

2013

Acta Phys. Pol. A

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“…Accordingly, the following diagnostic methods for insulating systems have been developed: invasive and non-invasive electrical methods [3][4][5][6][7][8][9][10][11] ; gas chromatography; wideband methods: UHF (ultra high frequency) or VHF (very high frequency) [12][13][14] ; the acoustic emission (AE) method [15][16][17][18][19][20][21][22][23][24][25] ; and optical spectrophotometry [26][27][28][29][30] . The subject area of this paper covers improving the AE method applications.…”

Section: Acoustic Emissionmentioning

confidence: 99%

“…Considerable interest in the AE method was observed in the 1960s, when the method was applied in studies of the PD phenomenon [31][32] . Studies involving perfecting the AE method applied to diagnose high-voltage insulating systems in power transformers have been carried out by many scientific and research centres [15][16][17][18][19][20][21][22][23][24][25][33][34] . However, diagnostic measurements related to applying the method for insulating systems in power capacitors are much narrower in scope.…”

Section: Acoustic Emissionmentioning

confidence: 99%

Application of a mobile system in diagnostics of power capacitors using the acoustic emission method

Błachowicz¹,

Boczar²,

Wotzka³

2016

Insight

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in the fields of informatics, electronics and electrical engineering. He obtained a PhD degree in engineering sciences and electrical engineering in 2014 from Opole University of Technology, Poland. The main objective of the work he has undertaken is diagnostics of the partial discharge (PD) effect occurring in medium voltage power capacitors. The work carried out also covers the modelling process for the phenomenon of acoustic emission generated by PDs. a PhD degree in electrical engineering from the Silesian University of Technology, Institute of Electrical Power Engineering, Gliwice, Poland. At the present time he is engaged in different applications of the acoustic emission method and other non-destructive methods, particularly in diagnostics of the insulation set-ups of electric appliances. In these fields he has published more than 300 journal and conference papers, five monographs and three books. Currently, he is a lecturer and research worker at Application of a mobile system in diagnostics of power capacitors using the acoustic emission method This paper presents the results obtained from measurements and analyses of acoustic emission (AE) signals generated by partial discharges (PD) in a model of power capacitors during experiments carried out under laboratory conditions.A remotely-controlled mobile unit (RCMU) has been used in experimental tests, allowing the safe execution of measurements in hazardous conditions. The measurement set-up and construction of the RCMU is presented. The study confirmed that it is possible to use a remotely-controlled mobile unit for carrying out measurements under high voltage.The most significant contribution of the paper lies in the idea that the PD of a condenser for electric power is detected using a mobile system, which can also be applied for other purposes related to the non-destructive diagnosis of power equipment systems working under difficult operating conditions.

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“…crystal structure defects motions in solids, cracks and micro cracks forming and shifting (Wotzka, Lusa, 2015), local environment motions combined with internal friction, chemical reactions, some biological process and partial discharges. Nowadays the AE phenomenon is willingly applied in numerous science areas, especially in technical diagnostics, for machines and devices condition testing purposes (Cichoń et al, 2011; A PD issue is known as one of the most important and constant aspects of a high voltage electrical equipment insulation systems diagnostics (Frącz et al, 2015;Lopatkiewicz et al, 2012). Although a single PD source AE is represented by a discrete signal, in insulation systems there usually multi PD sources appear.…”

Section: Introductionmentioning

confidence: 99%

Study on Descriptors of Acoustic Emission Signals Generated by Partial Discharges under Laboratory Conditions and in On-Site Electrical Power Transformer

Kunicki¹,

Cichoń²,

Borucki³

2016

Archives of Acoustics

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An acoustic emission method (AE) is widespread and often applied for partial discharge (PD) diagnostics, mainly due to its ease of application as well as noninvasiveness and relatively high sensitivity. This paper presents comparative analysis of AE signals measurement results archived under laboratory conditions as well as on-site actual AE signals generated by inside PDs in electrical power transformer during its normal service. Three different PD model sources are applied for laboratory research: point to point, multipoint to plate and surface type. A typical measuring set up commonly used for on-site transformer PD diagnostics is provided for the laboratory tasks: piezoelectric joint transducer, preamplifier, amplifier and measuring PC interface. During the on-site research there are three measuring tracks applied simultaneously. Time domain, time-frequency domain and statistical tools are used for registered AE signals analysis. A number of descriptors are proposed as a result of the analysis. In the paper, attempt of AE signals descriptors, archived under laboratory condition application possibilities for on-site PD diagnostics of power transformers during normal service is made.

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Characteristic of Acoustic Signals Generated by Operation of On Load Tap Changers

Cited by 17 publications

References 4 publications

Selecting Sensor for On Load Tap Changer Contacts Degree of Wear Diagnostics

Selecting Sensor for On Load Tap Changer Contacts Degree of Wear Diagnostics

Application of a mobile system in diagnostics of power capacitors using the acoustic emission method

Study on Descriptors of Acoustic Emission Signals Generated by Partial Discharges under Laboratory Conditions and in On-Site Electrical Power Transformer

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