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    Wyświetlanie 1-8 z 8
    Tytuł:
    Characterization of surface type partial discharges using electrical, acoustic emission and UHF methods
    Autorzy:
    Kunicki, M.
    Cichoń, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/114691.pdf
    Data publikacji:
    2015
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    partial discharges
    PD measurements
    UHF method
    AE method
    IEC60270
    transformer fault diagnosis
    Opis:
    This paper presents research results related to measurements of partial discharges (PD), which may occur in oil insulation systems of electric power transformers. Three measuring methods were considered: electrical (apparent charge - IEC60270), acoustic emission (AE) and ultra-high frequency (UHF) method. Research works have been proceeded under laboratory condition. PD were generated using special apparatus and spark gap configuration for surface PD modeling. Measurements were performed simultaneously for each of the regarded methods and were repeated for selected supply voltage levels. The electrical and UHF methods measurements were made using MPD measuring system from Omicron. The AE method measurements were made using a piezoelectric transducer, which was installed on the outer transformer tank wall. Comparative analysis of signals gathered during research works was made. Possibilities of application of the three considered PD detection methods for electric power systems with oil insulation were proposed in the paper.
    Źródło:
    Measurement Automation Monitoring; 2015, 61, 1; 12-15
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Time and frequency domain analysis of partial discharges using electrical method
    Autorzy:
    Kunicki, M.
    Cichoń, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/973070.pdf
    Data publikacji:
    2016
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    partial discharges
    electrical method
    IEC 60270
    frequency domain
    time domain
    Opis:
    Partial discharge (PD) measurement results with particular consideration of time domain and frequency domain analysis of pulses generated by PD model sources are presented in the paper. Three different PD generation model sources are selected for the research: surface type, point to point and multi-point to plate. All measurements are proceeded under laboratory conditions using electrical method of a PD detection, according to the IEC60270 standard. Various amplitude and power density spectrum descriptors are proposed, as well as PD source type identification abilities on grounds of the selected descriptors are considerated. Electrical power transformers on-line PD detection and evaluation systems improvement and development are the main purpose of the presented research. Laboratory experiment results gives a solid base for further research focused on verification of the proposed methodology on a real life apparatus.
    Źródło:
    Measurement Automation Monitoring; 2016, 62, 2; 72-77
    2450-2855
    Pojawia się w:
    Measurement Automation Monitoring
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of a Phase Resolved Partial Discharge Pattern Analysis for Acoustic Emission Method in High Voltage Insulation Systems Diagnostics
    Autorzy:
    Kunicki, M.
    Cichoń, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/177912.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic emission
    partial discharge
    transformer diagnostics
    insulation system
    Opis:
    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.
    Źródło:
    Archives of Acoustics; 2018, 43, 2; 235-243
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza czasowo-częstotliwościowa sygnałów emisji akustycznej generowanych przez podobciążeniowy przełącznik zaczepów o konstrukcji z osobnym wybierakiem i przełącznikiem mocy
    Time-frequency analysis of acoustic emission signals generated by on load tap changer constructed from separated selector and power switch
    Autorzy:
    Cichoń, A.
    Frącz, P.
    Lorenc., M.
    Powiązania:
    https://bibliotekanauki.pl/articles/153883.pdf
    Data publikacji:
    2011
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    podobciążeniowe przełączniki zaczepów (PPZ)
    diagnostyka transformatorów elektroenergetycznych
    metoda emisji akustycznej
    on load tap changer (OLTC)
    electric power transformer diagnosis
    acoustic emission method
    Opis:
    Podobciążeniowe przełączniki zaczepów (PPZ) są jednym z głównych elementów transformatora, który zapewnia możliwość regulacji napięcia w sieci elektroenergetycznej. Ich awarie są częstą przyczyną wyłączeń transformatorów rozdzielczych. W artykule przedstawiono wyniki prac naukowo-badawczych mających na celu scharakteryzowanie sygnałów emisji akustycznej (EA) generowanych przez PPZ o konstrukcji z osobnym wybierakiem i przełącznikiem mocy. Zaletą metody EA jest możliwość wykonywania pomiarów w warunkach normalnej pracy urządzenia. Badania przeprowadzono w warunkach laboratoryjnych. Analizę sygnałów EA przeprowadzono w dziedzinie czasu i czasowo-częstotliwościowej. Ocenę składowych czasowo-częstotliwościowych przeprowadzono z wykorzystaniem krótkoczasowej transformaty Fouriera (STFT) i ciągłej (CWT) transformaty falkowej.
    An important part of an electric power transformer is the on load tap changer (OLTC) which enables voltage regulation in the network. Due to high level of failure frequency of these devices, it is necessarily to look for new diagnostic methods which enable their technical state estimation under transformer normal operating conditions. Presently at the Electric Power Institute of the Opole University of Technology there are works in progress aspiring to determine the application possibility of the AE method for OLTC diagnosis. Results of the research works aiming at characterizing the acoustic emission (AE) signals generated by the OLTC constructed from a separated selector and a power switch are presented in the paper. Measurements were taken in a setup with a model of the OLTC type VEL - 110 - 27 from ELIN as the main element. AE signals generated during the whole OLTC joining cycle are presented. Within the signal there were enhanced four characteristic acoustic structures which regard to succeeding stages of the joining process. The AE signals generated by the selector and power switch were analyzed in detail. The analysis of time-frequency components of the signals generated by the OLTC was carried out with the short time Fourier transform (STFT) and con-tinuous wavelet transform (CWT). Based on the comparison of the AE signals generated by the power changer and the selector, two measuring paths endowed with wide band contact transducers were proposed for practical application.
    Źródło:
    Pomiary Automatyka Kontrola; 2011, R. 57, nr 4, 4; 360-363
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study on Descriptors of Acoustic Emission Signals Generated by Partial Discharges under Laboratory Conditions and in On-Site Electrical Power Transformer
    Autorzy:
    Kunicki, M.
    Cichoń, A.
    Borucki, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/176881.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    acoustic emission
    partial discharge
    transformer diagnostics
    Opis:
    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.
    Źródło:
    Archives of Acoustics; 2016, 41, 2; 265-276
    0137-5075
    Pojawia się w:
    Archives of Acoustics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of Acoustic Emission Signals Generated by the Contacts of the Selector
    Autorzy:
    Cichoń, A.
    Borucki, S.
    Wotzka, D.
    Szmajda, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1417945.pdf
    Data publikacji:
    2012-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    52.80.-s
    43.28.Js
    Opis:
    An important part of electric power transformer is the on load tap changer which enables for voltage regulation in the network. Due to high level of failure frequency of these devices it is necessary to look for new diagnostic methods which enable for theirs technical state estimation under transformer normal operating condition. Presently at the Electric Power Institute at Opole University of Technology there are works in progress aspiring to determine the application possibility of the acoustic emission method for on load tap changer diagnosis. Results of scientifically-research works aiming to characterize the acoustic emission signals generated by a separated selector are presented in the paper. Measurements have been performed in a setup with a model of on load tap changer type VEL-110-27 from ELIN. Acoustic emission signals generated by the selector have been analyzed in detail. Analysis of the time-frequency components of signals generated by on load tap changer has been carried out with the short time Fourier transform and continuous wavelet transform. Based on the comparison outcome of acoustic emission signals generated by the power changer and by the selector two measuring paths endowed with wide band contact transducers have been proposed for the practical application.
    Źródło:
    Acta Physica Polonica A; 2012, 122, 5; 804-807
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Planowanie eksploatacji transformatorów z zastosowaniem systemu TrafoGrade
    Planning of transformer operation with use of the TrafoGrade system
    Autorzy:
    Szrot, M.
    Płowucha, J.
    Subocz, J.
    Borucki, S.
    Cichoń, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/156483.pdf
    Data publikacji:
    2008
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    stan techniczny
    ocena
    eksploatacja transformatorów
    planowanie
    system TrafoGrade
    assessment
    technical condition
    operation planning
    transformer
    TrafoGrade system
    Opis:
    W artykule przedstawiono system oceny stanu technicznego transformatorów TrafoGrade, który opracowano w firmie Energo-Complex i wdrożono w praktyce. Omówiono podstawy tworzenia części technicznej oceny transformatorów, która składa się z trzech etapów ocen grupowych oraz etapu końcowej oceny transformatora. Przedstawiono zasady określania znaczenia transformatorów w sieci elektroenergetycznej. Podano przykłady zastosowania systemu TrafoGrade w praktyce eksploatacyjnej oraz wnioski wypływające z jego użycia dla określonej populacji transformatorów.
    The paper presents the TrafoGrade system for assessment of transformer technical condition, designed by Energo-Complex and implemented into operation. The basics for preparing the technical part of assessment consisting of three stages of group grades and the final stage of transformer assessment are given. There are also described the principles of determining the transformer importance in the system. Some examples of application of TrafoGrade to operation conditions and the conclusions resulting from its use for a determined population of transformers are presented.
    Źródło:
    Pomiary Automatyka Kontrola; 2008, R. 54, nr 11, 11; 780-782
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ekonomiczne aspekty eksploatacji transformatorów z wykorzystaniem systemu TrafoGrade
    Economic aspects of transformer operation with TrafoGrade system application
    Autorzy:
    Szrot, M.
    Płowucha, J.
    Subocz, J.
    Borucki, S.
    Cichoń, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/155786.pdf
    Data publikacji:
    2009
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    ocena stanu technicznego
    eksploatacja transformatorów
    planowanie
    system TrafoGrade
    technical condition assessment
    operation planning
    transformer
    TrafoGrade system
    Opis:
    W artykule przedstawiono metodykę i przykładowe wyniki diagnostyki transformatorów elektroenergetycznych prowadzonej z wykorzystaniem systemu TrafoGrade, który opracowano i wdrożono w firmie Energo - Complex. Scharakteryzowano poszczególne części składowe systemu takie jak ocena stanu technicznego, ocena znaczenia transformatora w systemie elektroenergetycznym oraz analiza ekonomicznych perspektyw eksploatacji. Przedstawiono również koncepcję stworzenia systemu komputerowego do zarządzania populacją transformatorów. Podano przykładowe analizy wykonane w oparciu o otrzymane wyniki pomiarowe z 45 transformatorów rozdzielczych zainstalowanych w jednej ze spółek dystrybucyjnych działających na terenie Polski.
    Power transformers are significant part of assets owned by entities distributing and transferring electric energy. In Poland, there are several thousands of medium and high power transformers operated, while over 50% of them is older than 30 years, what means they have already exceeded their planned lifetime. At present in Europe there are not sufficient production and financial means allowing to exchange most of transformers population in the close future. The only possibility is maximally to prolong the operation of already installed old units [1]. To help fulfilling this task Energo-Complex Ltd. has elaborated complex system of transformers management, named TrafoGrade, which is based on the point scale assessment of transformer's technical condition, its importance in the power grid and linking technical aspects of diagnostics with economic-financial factors to conduct decision process optimizing in the range of routine exploitation, repairs planning and investment policy [2]. The assessment of technical ondition with TrafoGrade system is based on analysis of 15 parameters obtained from diagnostic measurements, divided into three groups (Fig. 2). The paper presents examples of technical condition assessment (Fig. 4, 5, 6) and describes operational possibilities for 45 distribution transformers installed in one of distribution companies operating in Poland. For the operation planning and rationalization, the technical condition of transformers was linked to their importance in power system (Fig. 7), which allowed to divide given population into three basic groups of further exploitation: transformers with simplified operation (U), transformers with normal operation (N) and transformers with special operation (S). TrafoGrade system is a modern tool for diagnostics and management of transformers. The complex assessment of technical condition gives a lot of important information to be applied in logistic actions and financial policy of transformers operators. The important advantage of TrafoGrade system is simple form of assessment presentation, helping to analyze results of measurement both by engineering staff and managing personnel without wide technical knowledge.
    Źródło:
    Pomiary Automatyka Kontrola; 2009, R. 55, nr 1, 1; 65-68
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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