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Wyświetlanie 16-30 z 57
Tytuł:
Selecting Sensor for On Load Tap Changer Contacts Degree of Wear Diagnostics
Autorzy:
Cichoń, A.
Borucki, S.
Berger, P.
Powiązania:
https://bibliotekanauki.pl/articles/1399337.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
Results of scientific 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 different 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.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 395-398
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characteristic of Acoustic Signals Generated by Operation of On Load Tap Changers
Autorzy:
Cichon, A.
Fracz, P.
Zmarzly, D.
Powiązania:
https://bibliotekanauki.pl/articles/1493036.pdf
Data publikacji:
2011-10
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
52.80.-s
43.28.Js
Opis:
Possibilities of application of the acoustic method for the on load tab changers diagnosis has been presented in the paper. The analysis of measurement results gathered during research works performed under laboratory conditions has been presented in detail. The registered acoustic signals have been analyzed in time and time-frequency domains. The time domain analysis has been performed by presentation of time runs and their envelopes determined by use of the Hilbert transform. Evaluation of the time-frequency components has been performed by use of the short-time Fourier transform, the discrete and the continuous wavelet transforms.
Źródło:
Acta Physica Polonica A; 2011, 120, 4; 585-588
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis of Interference Signals Generated by Vibroacoustic Vibrations of Transformer Cores
Autorzy:
Boczar, T.
Borucki, S.
Cichoń, A.
Powiązania:
https://bibliotekanauki.pl/articles/1199078.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
79.60.Bm
42.79.Pw
52.80.Hc
Opis:
The article deals with the subject matter referring to the interference that may accompany measurements of vibroacoustic signals, generated by electric power transformers, taken by using the acoustic emission method under industrial conditions. Paper concerns measurement and analysis of internal, acoustic type disturbances, including the magnetostrictive vibrations of plate sets within the transformer core, caused by changes in the magnetic flux. Paper presents measurement results of acoustic interfering signals and results of analyses made in the frequency and time-frequency domains. Power spectral density, MUSIC pseudospectra, two- and three-dimensional short time Fourier transform spectrograms, continuous wavelet transform scalograms, discrete wavelet transform, and quantities of energy transferred are included in the paper.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1355-1359
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostyka stanu technicznego obwodu magnetycznego transformatorów energetycznych z wykorzystaniem zmodyfikowanej metody wibroakustycznej
Diagnostics of technical condition of power transformer magnetic circuit with use of a modified vibroacoustic method
Autorzy:
Borucki, S.
Cichoń, A.
Skubis, J.
Powiązania:
https://bibliotekanauki.pl/articles/153431.pdf
Data publikacji:
2013
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
transformator elektroenergetyczny
drgania mechaniczne
metoda wibroakustyczna
rdzeń
power transformer
mechanical vibrations
vibroacoustic method
core
Opis:
W publikacji scharakteryzowano zaproponowaną metodykę, tzw. zmodyfikowaną metodę wibroakustyczną, oraz przedstawiono rezultaty badań uzyskane na dwóch transformatorach, jednostce typu TR 16000/110 i TORb 25000/110. Ocenę efektywności opracowanej metodyki pomiarowo – diagnostycznej przeprowadzono poprzez korelację wyników analizy czasowo – częstotliwościowej zarejestrowanych wibracji z rezultatami badań chromatograficznych (DGA) oleju elektroizolacyjnego pobranego z kadzi monitorowanych urządzeń. Analizę zarejestrowanych drgań wykonano z wykorzystaniem przekształceń STFT, CWT i DWT.
The subject of the paper concerns evaluation of the technical condition of the power transformer magnetic circuit by measuring and analyzing vibrations recorded during switching on the transformer. This paper presents the results of technical verification of the noninvasive method used for diagnostics of transformer cores. The research on application of this method has been performed at the Institute of Power Engineering of the Opole University of Technology for several years. The paper characterizes the proposed methodology, the so-called modified vibroacoustic method, and presents the results obtained on two tested transformers, type TR 16000/110 and TORb 25000/110. Evaluation of the effectiveness of the developed methodology of diagnostic measurements was performed by correlation analysis of the time-frequency vibrations recorded with the results of chromatographic studies (DGA) of oil taken from the transformer tank. The recorded vibrations were analyzed using the transformation STFT (Short Time Fourier Transform), CWT (Continuous Wavelet Transform) and DWT (Discrete Wavelet Transform). On the basis of the results given in this paper as well as the currently conducted research work, it was found that there is a real possibility of using the developed method for noninvasive assessment of technical condition of mechanical construction of power transformer cores in operating conditions.
Źródło:
Pomiary Automatyka Kontrola; 2013, R. 59, nr 2, 2; 102-105
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostyka transformatorów energetycznych z wykorzystaniem metody wibroakustycznej
Diagnostics of Power Transformers Using the Vibroacoustic Method
Autorzy:
Borucki, S.
Cichoń, A.
Boczar, T.
Powiązania:
https://bibliotekanauki.pl/articles/155761.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
transformator energetyczny
drgania
rdzeń
metoda wibroakustyczna
diagnostyka
power transformer
vibration
core
vibroacoustic method
diagnostic
Opis:
Tematyka artykułu dotyczy diagnostyki rdzeni transformatorów elektro-energetycznych dużej mocy z wykorzystaniem pomiarów drgań wibroaku-stycznych. W artykule, na podstawie analizy drgań mechanicznych kadzi, dokonano oceny stanu technicznego czterech transformatorów blokowych typu TFBb 240000/400. Scharakteryzowano układ pomiarowy, który został wykorzystany podczas rejestracji sygnałów pochodzących od przenoszonych przez kadź drgań rdzenia poszczególnych jednostek. W oparciu o przyjęte w artykule wartości kryterialne podjęto próbę oceny stanu technicznego diagnozowanych urządzeń elektroenergetycznych.
During its operation a power transformer is subjected to the influence of numerous unfavourable factors which shorten its operation time and can cause unexpected disastrous failures. As far as the active part of a transformer is considered, magnetostrictic vibrations and cellulose depolymerization are the most harmful factors causing the loss of mechanical strength. Their influence results in the gradual loosening of the pressing and clamping of the core and transformer windings, which leads to the weakening of the active part mechanical construction (Fig. 1). In the electric power sector there are a few methods for detection of damages in power transformers. One of them is the vibroacoustic method which consists in measurement and analysis of vibrations of the object under study. Its application to high-power transformer diagnostics enables, first of all, assessing the technical condition of the core. Additionally, combining this method with other diagnostic methods can provide information not only on the core technical condition but also on the solid insulation properties of the device being tested [5 - 6]. In the paper the technical assessment of the condition of four unit transformers of type TFBb 240000/400 is performed basing on the analysis of mechanical vibrations of the tub. The basic technical parameters of the transformers are listed in Table 1. The measuring system used for recording the signals coming from the core vibrations of the particular units and transferred by the tub is described. Based on the criterion values [among others 6 - 8] an attempt to assess the technical condition of the electric power appliances diagnosed is made. The investigations and analyses carried out confirm that the measurement results of vibrations of the particular units have not revealed any damage to their cores or other defects of mechanical character.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 1, 1; 19-22
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Praktyczny przykład skutecznej detekcji i lokalizacji wyładowań niezupełnych metodą emisji akustycznej w transformatorze elektroenergetycznym
Practical example of effective detection and location of partial discharges by the acoustic emission method in an electric power transformer
Autorzy:
Skubis, J.
Cichoń, A.
Borucki, S.
Powiązania:
https://bibliotekanauki.pl/articles/155763.pdf
Data publikacji:
2009
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
wyładowania niezupełne
metoda emisji akustycznej
diagnostyka
transformator elektroenergetyczny
partial discharges
acoustic emission method
diagnostics
power transformer
Opis:
W artykule przedstawiono przykład diagnostyki transformatora elektro-energetycznego pod kątem oceny stanu technicznego papierowo - olejowego układu izolacyjnego zagrożonego występowaniem wyładowań niezupełnych (WNZ). Badania przeprowadzono podczas normalnej pracy jednostki transformatorowej, rejestrując w 36 punktach na powierzchni kadzi sygnały emisji akustycznej (EA) pochodzącej od zjawisk fizycznych występujących wewnątrz transformatora. Zarejestrowane sygnały poddano analizie w dziedzinie czasowej, częstotliwościowej i czasowo - częstotliwościowej. Wynikiem badań była detekcja i lokalizacja miejsca występowania wyładowań elektrycznych oraz wskazanie prawdopodobnej przyczyny i miejsca ich powstawania.
Three measurement methods: gas chromatography method (DGA), electrical method and AE method are used in the assessment of the technical condition of paper-oil insulation of high-power transformers exposed to the occurrence of partial discharges (PDs). The acoustic method of PD detection is used as a supplementary one to the two others, mainly the gas chromatography method which does not make it possible to locate the place of the insulation system defect appearance. The basic advantage of the AE method, compared with the electrical one, is the possibility of its application during regular operation of power appliances [2, 3]. The paper presents the measurement results of the AE signals accompanying regular operation of a power transformer of 270 MVA. In order to assess the intensity of the AE signals measured on the object under study, coming from physical phenomena taking place inside a tub, three analyses were performed: in the time, frequency and time-frequency domains. Registration of the AE signals, the distributions of which is shown in Fig. 2, was carried out at 36 measurement points. An exemplary waveform of the AE signals registered is shown in Fig. 3, while the results of the analysis in the time domain are listed in Tables 1 and 2. In order to assess the waveforms registered more accurately, the analysis in the frequency domain was carried out and amplitude spectra were determined, an example of which is presented in Fig. 4. The time-frequency analysis was performed by using a short-time Fourier transform (STFT) determining two-dimensional spectrograms of the power density spectrum (Fig. 5). The assessment of the technical condition of the transformer under study made it possible to detect and locate areas in which PDs occurred. Damage of magnetic screens is a probable cause of their occurrence.
Źródło:
Pomiary Automatyka Kontrola; 2009, R. 55, nr 1, 1; 30-33
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the Acoustic Emission Method for Diagnosis of On-Load Tap Changer
Autorzy:
Majchrzak, H.
Cichoń, A.
Borucki, S.
Powiązania:
https://bibliotekanauki.pl/articles/176624.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
acoustic emission
partial discharge
transformer diagnostics
Opis:
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) GIII 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.
Źródło:
Archives of Acoustics; 2017, 42, 1; 29-35
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnosis of the Non-Concurrent Operation of the On-Load Tap Changer Contacts by the Acoustic Emission Method
Autorzy:
Cichoń, A.
Borucki, S.
Boczar, T.
Powiązania:
https://bibliotekanauki.pl/articles/177044.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
power transformer
on-load tap changers
acoustic emission method
Opis:
On-load tap changers (OLTC) are some of the main transformer elements that make voltage adjustment in a power network possible. Their failures often cause shutdowns of distribution transformers. The paper presents research work aimed at the assessment of the technical condition of OLTCs by the acoustic emission method (EA). This method makes the OLTC diagnosis possible without the need of disconnecting the transformer from the system. The measurements were taken in laboratory conditions. The influence on the operation non-concurrence of the power tap changer contacts on the AE registered signals has been investigated. The signals registered were subjected to analyses in the time and time-frequency domains. The result analysis in the time domain was carried out using the Hilbert transform and calculating characteristic times for the particular runs. A short-time Fourier transform was used for the assessment of results in the time-frequency do- main.
Źródło:
Archives of Acoustics; 2011, 36, 4; 823-830
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modeling and Experimental Verification of Ultrasound Transmission in Electro Insulation Oil
Autorzy:
Wotzka, D.
Cichoń, A.
Boczar, T.
Powiązania:
https://bibliotekanauki.pl/articles/177158.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
ultrasound transmission
numerical simulations
electro-insulation oil
Opis:
A verification study of ultrasound transmission numerical simulation results with experiment results is presented in this paper. The work considers a model of a transformer tank which is filled with electro insulating oil. In the experiment, performed under laboratory conditions, an ultrasound wave is generated by a piezoelectric transducer that is fixed in the centre of the tank and measured by another transducer mounted inside the tank at three distances: 10, 20 and 30 cm from the sound source. The transducer is able to measure and generate acoustic waves in the ultrasound frequency band up to 1 MHz. The simulation considers numerical calculation of acoustic pressure distribution inside the tank in which acoustic source emits waves with frequency equal to 100 kHz. Verification analysis has confirmed consistency of the numerically calculated values with the measurement results.
Źródło:
Archives of Acoustics; 2012, 37, 1; 19-22
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the Technical Condition of the Active Part of the High Power Transformer Based on Measurements and Analysis of Vibroacoustic Signals
Autorzy:
Borucki, S.
Cichoń, A.
Majchrzak, H.
Zmarzły, D.
Powiązania:
https://bibliotekanauki.pl/articles/176397.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
vibration
vibroacoustic method
core
power transformer
transformer diagnostics
Opis:
This article presents the results of research connected with the development and industrial use of vibroacoustic methods for the evaluation of the technical condition of the active part of transformers. The article presents the results of the analysis of vibrations generated by the high power transformer in which a defect was found on the basis of tests of oil carried out using the chromatography tests. In order to confirm the damage of the active part of this transformer, vibroacoustic measurements were performed in three states of its operation. The measurement using the classical vibroacoustic method included the registration of vibrations at the idle speed and during the load operation of the transformer. The original diagnostic method, so-called the modified vibroacoustic method, was also used during the measurement. The analysis of signals recorded using the classical vibroacoustic method was carried out in the frequency domain by indicating the amplitude of even harmonic vibrations. However, the analysis of signals measured during the commissioning of the transformer was conducted in the time-frequency domain using the short-time Fourier transform (STFT), continuous wavelet transform (CWT), and discrete wavelet transform (DWT). On the basis of the analysis of the results obtained it was stated that the increased level of vibrations of this transformer is a consequence of the loss of rigidity of the mechanical structure of its core.
Źródło:
Archives of Acoustics; 2017, 42, 2; 313-320
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Repeatability Estimation for Vibration Measurement Results of Power Transformer Core
Autorzy:
Borucki, S.
Cichon, A.
Skubis, J.
Boczar, T.
Powiązania:
https://bibliotekanauki.pl/articles/1198972.pdf
Data publikacji:
2014-06
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
The subject matter of this paper refers to the diagnostics of a transformer core, based on measurements and analysis of vibroacoustic signals registered during their normal operation. The paper presents results of the research aimed to evaluate the repeatability of vibration measurements for power transformer core. Recording of vibroacoustic signals was performed under laboratory conditions on dry-insulated transformers. The study concerned evaluation of changes in vibroacoustic indicators of the transformer core during operation with a turned and loosened core. Conclusions from the measurement results were drawn on the basis of the parametric test of significance derived from the variance analysis for many means of single classification basing on the Fisher-Snedecor F-distribution.
Źródło:
Acta Physica Polonica A; 2014, 125, 6; 1299-1302
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solving a Set of Spherical Equations for Localization of Partial Discharges by Acoustic Emission Method
Autorzy:
Boczar, T.
Witkowski, P.
Borucki, S.
Cichoń, A.
Powiązania:
https://bibliotekanauki.pl/articles/1401873.pdf
Data publikacji:
2015-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
This article deals with the subject matter of improvement of the acoustic emission methods used for location of partial discharges, which may occur inside power transformer insulation systems. Analytical solutions of spherical equations for location of partial discharge generation using the acoustic method were shown in detail. Presented in the article method of solving the assumed equations is based on the analytical method and matrix notation. Theoretical considerations and later the measurement-based verification refer to the use of the triangulation method for location of the occurrence of partial discharges. The results of the scientific and research works that have been presented in this article are the next stage of research aimed at development of on-line diagnosis system for insulation systems of electrical equipment, allowing for detection, measurement and identification of forms and locations of partial discharges using the acoustic emission method.
Źródło:
Acta Physica Polonica A; 2015, 128, 3; 299-305
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Wavelet Analysis of the Vibroacoustic Signal Measurement in a Transient State Operation of Power Transformer
Autorzy:
Borucki, S.
Cichon, A.
Boczar, T.
Zmarzly, D.
Powiązania:
https://bibliotekanauki.pl/articles/1417934.pdf
Data publikacji:
2012-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.40.-r
43.40.Vn
43.58.Wc
Opis:
The article presents the results of attempts made to develop a non-invasive diagnostic method of a technical state of a transformer's core based on an analysis of mechanical vibrations registered during the start-up of the transformer analyzed. The paper presents a characteristic of the transformer under study, the measuring systems applied and the method developed for assessing the degree of the core loosening. The original results presented in the paper have been obtained under laboratory conditions during tests conducted on an oil transformer of 200 kVA. The analysis of recorded virboacoustic signals was performed by means of discrete wavelet transform for three different operating cases: the transformer with no core defect, the transformer with loose screws of the magnetic circuit of the upper yoke, and the transformer with completely loosen screws of the beam of the upper yoke and the lower core. The signals have been recorded on two perpendicular measuring axes: 0X and 0Y and their measured values were subject to the wavelet analysis.
Źródło:
Acta Physica Polonica A; 2012, 122, 5; 800-803
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
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:
Analysis of Acoustic Signals Interfering Diagnostic Measurements of Electric Power Transformer Tap Changers
Autorzy:
Boczar, T.
Cichoń, A.
Borucki, S.
Szczyrba, T.
Powiązania:
https://bibliotekanauki.pl/articles/1399334.pdf
Data publikacji:
2013-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
43.58.-e
43.60.-c
43.60.Bf
Opis:
Subject matter of this paper applies to improvement of acoustic emission method used in the diagnosis of on load tap changers of high power transformers. During measurement of acoustic emission signals generated by damages or defects, which can appear in insulation system and in the power transformer tap changers, various forms of noise signals may occur. Interferences occurring during measurements under laboratory and under industrial conditions can be generated either by sources placed inside the studied electric power device or they can be emitted in their immediate vicinity. Sources of interfering signals are physical phenomena of a mechanical, electrical or acoustical nature. Interferences appearing during measurement of acoustic emission pulses generated by electrical discharges and other types of defects that overlap the measured waveforms may result in their distortion. As part of the research conducted, the results of which are presented in this paper, following was subjected under consideration: measurements of acoustic noise signals generated by partial surface discharges occurring on support and bushing insulators were performed.
Źródło:
Acta Physica Polonica A; 2013, 124, 3; 387-390
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
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