Application of Acoustic Emission and Thermal Imaging to Test Oil Power Transformers

Witos, F.; Olszewska, A.; Opilski, Z.; Lisowska-Lis, Agnieszka; Szerszeń, Grzegorz

doi:10.3390/en13225955

Cited by 7 publications

(4 citation statements)

References 28 publications

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“…In addition, at measurement points where signals with high activity are recorded, WD and WDI type broadband sensors are installed. This stage of research is presented in detail in [28]. At each measurement point, AE signals are recorded several times; each of them has a length of 1 s. For each of the recorded signals, the ADC descriptor is calculated and finally, the average value of the ADC descriptors of all signals recorded in one measurement point is calculated.…”

Section: The Authors' Ae Methods Of Pds Research In Power Oil Transfo...mentioning

confidence: 99%

Investigation of Partial Discharges within Power Oil Transformers by Acoustic Emission

Witos

Olszewska

2023

Energies

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This paper presents the authors’ multi-channel measurement systems designed and built to conduct research on partial discharge phenomena using the acoustic emission method. The systems provide real-time monitoring, recording of signals and analysis of recorded signals. The analysis is carried out in time, frequency, time-frequency and discrimination threshold domains. In particular, a descriptor with the ADC acronym is defined, which ranks the signals according to the so-called degree of advancement. Studies have been carried out, showing that for a single partial discharge source, when tested in parallel, using the electrical and acoustic emission methods, the ranking of the signals using this descriptor is identical to the ranking according to the value of the apparent charge introduced by sources. This paper presents the authors’ patented method of partial discharge location and identification in power oil transformers. The results of tests of power oil transformer at the test station, conducted in parallel with the electric method and the authors’ method, and the results of tests in three selected transformers carried out during ongoing in-situ operation using the authors’ method are presented. Based on these results, the authors make diagnoses of the condition of the insulation systems in the tested transformers. The inspections of these transformers confirm the diagnoses.

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Section: The Authors' Ae Methods Of Pds Research In Power Oil Transfo...mentioning

confidence: 99%

Investigation of Partial Discharges within Power Oil Transformers by Acoustic Emission

Witos

Olszewska

2023

Energies

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“…The live display of the measurements in combination with an intuitive software interface allows users without previous experience to perform measurements within the first five minutes after switching on the device [33], [34].…”

Section: B Measuring System For Acoustic Emission Analysismentioning

confidence: 99%

Combination of Non-contact and Contact Measuring Methods for Analyzing Structural Conditions of Dry Transformers

Gutten,

Korenciak,

Karman

et al. 2023

Measurement Science Review

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The article describes the non-contact and contact analysis of 1-MVA dry power transformers with epoxy-resin insulation using an acoustic camera and frequency analyzer with automatic sweeping for low-middle frequency areas. Power transformers are most commonly used for construction component (core, windings, taps) analysis. The electrical, non-rotating machine generates electromagnetic and acoustic emissions that can be used to analyze dry transformers during their operation. Non-contact online diagnostic methods have many advantages over offline methods because it is not necessary to shut down the transformer, and also, the condition and behaviour of the machine are analyzed during its normal operation. The article presents the analysis and comparison of structural parts of the distribution dry transformers of the same type and power. The problem of insufficient or incorrect clamp-screw connection was identified using the SFRA (Sweep Frequency Response Analysis) method.

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“…The article discusses the design process in detail and builds individual system hardware modules and software layers. Also, the results of the analysis carried out using acoustic emission and thermal imaging for a specific oil filled power transformer are presented in [67].…”

Section: Acoustic Emission Testingmentioning

confidence: 99%

“…Acoustic emission testing (AET): it is about detecting and analyzing the sound waves generated by the cable insulation during normal operation. In fact, the reduced elasticity of worn insulating materials causes different sound waves to be generated [66,67].…”

mentioning

confidence: 99%

A Comprehensive Review of Fault Diagnosis and Prognosis Techniques in High Voltage and Medium Voltage Electrical Power Lines

Bindi,

Piccirilli,

Luchetta

et al. 2023

Energies

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This paper presents an extensive review of the most effective and modern monitoring methods for electrical power lines, with particular attention to high-voltage (HV) and medium-voltage (MV) systems. From a general point of view, the main objective of these techniques is to prevent catastrophic failures by detecting the partial damage or deterioration of components and allowing maintenance operations to be organized. In fact, the protection devices commonly used in transmission and distribution networks guarantee the location of faults, such as short-circuits, putting the non-functioning branch of the network out of service. Nowadays, alongside these devices, it is possible to introduce new intelligent algorithms capable of avoiding the total loss of functionality, thus improving the reliability of the entire network. This is one of the main challenges in modern smart grids, which are characterized by the massive integration of renewable energy sources and a high level of complexity. Therefore, in the first part of this paper, a general overview of the most common protection devices is proposed, followed by an analysis of the most modern prevention algorithms. In the first case, the coordination of the relays plays a fundamental role in obtaining the fault location with a high level of selectivity, while in the field of preventive analysis, it is necessary to address the implementation of artificial intelligence methods. The techniques presented in this paper provide a comprehensive description of the different monitoring approaches currently used in distribution and transmission lines, highlighting the coordination of protection relays, the computational algorithms capable of preventing failures, and the influence of the distributed generation in their management. Therefore, this paper offers an overview of the main diagnostic techniques and protection devices, highlights the critical issues that can be overcome through the introduction of artificial intelligence, and describes the main prognostic methods, focusing on their invasive level and the possibility of operating directly online. This work also highlights the main guidelines for the classification and choice between the different approaches.

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Application of Acoustic Emission and Thermal Imaging to Test Oil Power Transformers

Cited by 7 publications

References 28 publications

Investigation of Partial Discharges within Power Oil Transformers by Acoustic Emission

Investigation of Partial Discharges within Power Oil Transformers by Acoustic Emission

Combination of Non-contact and Contact Measuring Methods for Analyzing Structural Conditions of Dry Transformers

A Comprehensive Review of Fault Diagnosis and Prognosis Techniques in High Voltage and Medium Voltage Electrical Power Lines

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