Application of the joint electro-acoustic method for partial discharge investigations within a power transformer

Witos, F.; Gacek, Z.

doi:10.1140/epjst/e2008-00553-x

Cited by 17 publications

(22 citation statements)

References 10 publications

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“…Recorded AE signals have been put to filtration within the band of 110-200 kHz, and next basic characteristics, amplitude distributions and AE descriptor with an acronym ADC [1][2][3][4][5] were worked up. Basing on kriging method, the descriptor maps on lateral walls of trans- Positions of measuring points in the measuring network are also marked on the maps.…”

Section: Maps Of Descriptorsmentioning

confidence: 99%

“…Author's method used to analyze AE signals [1][2][3][4][5][6], applied to signals recorded in power oil transformers, enables us to elaborate the method how to investigate AE signals in power oil transformers which includes successively: recording of signals, calculation of amplitude distributions of signals, calculation of defined AE descriptors, working up of descriptor maps on lateral walls of transformer tanks, location of AE sources according to these maps by means of the method of maximum loudness (modified by the authors), and analysis of properties characteristic for signals recorded at points lying in the vicinity of identified sources. Presented stages of analysis are realized repeatedly within different frequency bands which enable to distinguish signals coming from different types of sources such as partial discharges (PD), Barkhausen's effect, oil circulation, and outer acoustic interferences.…”

Section: Introductionmentioning

confidence: 99%

“…In order to investigate transformers an author's measuring system called AE DEMA-COMP [1][2][3][4][5][6] was applied; such a system has been equipped with AE sensors D9241A type, produced by Euro Physical Acoustic Corporation. Investigations concern two oil power transformers with transformer ratio of 120/20/6 kV and rated power of 25 MVA.…”

Section: Introductionmentioning

confidence: 99%

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

2011

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Investigation results of properties characteristic for acoustic emission signals recorded in two selected power oil transformers are presented. Signals were put to the filtration, whereas components coming from partial discharges have been left. The calculations concerned: phase-time characteristics, averaging phase characteristics, averaging short time Fourier transform spectrograms, amplitude distributions of signals, values of acoustic emission descriptor with acronym ADC. On the ground of calculated basic characteristics and maps of ADC descriptor three areas have been selected on lateral walls of transformer tanks. Acoustic emission signals recorded in these areas were analyzed from the point of view how is influence of propagation path on these properties.

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Section: Maps Of Descriptorsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2011

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“…A properly conducted transformer maintenance is essential to optimize the total power system maintenance costs, and in particular, to ensure the continuity of the electricity supply service to consumers (Lopatkiewicz et al, 2012;Menon et al, 2001;Witos, Gacek, 2008). A failure to comply with the n−1 secure condition, may lead to the breach of the terms and conditions of the transmission contracts binding transmission and distribution system operators as well as electricity market participants.…”

Section: Introductionmentioning

confidence: 99%

Application of the Acoustic Emission Method for Diagnosis of On-Load Tap Changer

Majchrzak¹,

Cichoń²,

Borucki³

2017

Archives of Acoustics

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This paper provides an example of the application of the acoustic emission (AE) method for the diagnosis of technical conditions of a three-phase on-load tap-changer (OLTC) G III type. The measurements were performed for an amount of 10 items of OLTCs, installed in power transformers with a capacity of 250 MVA. The study was conducted in two different OLTC operating conditions during the tapping process: under load and free running conditions. The analysis of the measurement results was made in both time domain and time-frequency domain. The description of the AE signals generated by the OLTC in the time domain was performed using the analysis of waveforms and determined characteristic times. Within the time-frequency domain the measured signals were described by short-time Fourier transform spectrograms.

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“…Many different PD detection and analysis methods based on a different physical phenomena accompanying a PD are presently known (Szmechta et al, 2011;Witos, Gacek, 2008;Wotzka et al, 2010;Zmarzły, Nagi, 2014). Apart from AE method, there may be pointed such main methods as a spectrophotometry method based on light emission (Deng et al, 2001;Frącz et al, 2012;2013;Frącz, 2013;Wang et al, 2006), thermovision method, based on heat emission, dissolved gas analysis (DGA) method, based on chemical reactions results, electrical method, based on electrical capacitance changes, transient earth voltage (TEV), based on electromagnetic radiation in high frequency range, and ultra-high frequency (UHF) method, based on radio frequency radiation.…”

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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Application of the joint electro-acoustic method for partial discharge investigations within a power transformer

Cited by 17 publications

References 10 publications

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

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

Application of the Acoustic Emission Method for Diagnosis of On-Load Tap Changer

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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