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Wyświetlanie 1-15 z 38
Tytuł:
Analiza badań wyładowań niezupełnych kablowych linii elektroenergetycznych średniego napięcia
Analysis of partial discharge tests of medium-voltage power line cable
Autorzy:
Zajkowski, K.
Kucharska, S.
Kluska, P.
Pawluch, K.
Powiązania:
https://bibliotekanauki.pl/articles/310992.pdf
Data publikacji:
2016
Wydawca:
Instytut Naukowo-Wydawniczy "SPATIUM"
Tematy:
wyładowanie niezupełne
badania wyładowań niezupełnych
pomiar wyładowań niezupełnych
partial discharge tests
partial discharge measurement
Opis:
Artykuł obejmuje zagadnienia dotyczące pomiaru wyładowań niezupełnych w kablowych liniach elektroenergetycznych średniego napięcia, przyczyny ich powstawania, a także opis sprzętu, którym wykonuje się badania. Opisane zostały również analizy badań wyładowań niezupełnych dla kabli SN typu XRUHAKXS 3x1x120mm².
Article covers issues relating to the measurement of partial discharge of medium-voltage power line cable, the causes of their formation, and a description of the equipment, which shall be the test. Briefly described are also partial discharge test analysis for SN type XRU-HAKXS 3x1x120mm².
Źródło:
Autobusy : technika, eksploatacja, systemy transportowe; 2016, 17, 12; 1509-1513
1509-5878
2450-7725
Pojawia się w:
Autobusy : technika, eksploatacja, systemy transportowe
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:
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:
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:
Low voltage winding insulation systems under the influence of high du/dt slew rate inverter voltage
Autorzy:
Pauli, Florian
Ruf, Andreas
Hameyer, Kay
Powiązania:
https://bibliotekanauki.pl/articles/140993.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
life time
partial discharge
SiC semiconductors
winding insulation system
Opis:
Variable speed and low voltage electrical drives are commonly operated by frequency converters. According to recent developments, there is a trend in the area of semi-conductors, that switching frequency and voltage slew rate will increase significantly. The aim of these semiconductors is to reduce the switching losses and to increase the switching frequency, which enables to reduce the size of passive components in the powerelectric circuit. This results in less material effort and lower cost, for the power electronic component. However, electric motors operated by high slew rate inverters show problems in the winding insulation, which have to be analyzed. Such problems are well known for high voltage machines. Due to the increasing slew rate, this problematic occurs in low voltage machines nowadays as well. Here, the influence of fast switching semiconductors on the winding insulation system is studied, using accelerated ageing tests with fast switching high-voltage generators.
Źródło:
Archives of Electrical Engineering; 2020, 69, 1; 187-202
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variability of the Acoustic Emission Signals Generated by Partial Discharges in Mineral Oil
Autorzy:
Kunicki, Michał
Powiązania:
https://bibliotekanauki.pl/articles/177772.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
acoustic emission
partial discharge
insulation system
measurements
signal processing
Opis:
The main purpose of the presented research is to investigate the partial discharge (PD) phenomenon variability under long-term AC voltage with particular consideration of the selected physical quantities changes while measured and registered by the acoustic emission method (AE). During the research a PD model source generating surface discharges is immersed in the brand new insulation mineral oil. Acoustic signals generated by the continuously occurred PDs within 168 hours are registered. Several qualitative and quantitative indicators are assigned to describe the PD variability in time. Furthermore, some longterm characteristics of the applied PD model source in mineral oil, are also presented according to acoustic signals emitted by the PD. Finally, various statistical tools are applied for the results analysis and presentation. Despite there are numerous contemporary research papers dealing with long-term PD analysis, such complementary and multiparametric approach has not been presented so far, regarding the presented research. According to the presented research from among all assigned indicators there are discriminated descriptors that could depend on PD long-term duration. On the grounds of the regression models analysis there are discovered trends that potentially allow to apply the results for modeling of the PD variability in time using the acoustic emission method. Subsequently such an approach may potentially support the development and extend the abilities of the diagnostic tools and maintenance policy in electrical power industry.
Źródło:
Archives of Acoustics; 2019, 44, 2; 339-348
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of conductive particle contaminationon the insulation system of rotating electrical machines with direct oil cooling
Autorzy:
Yang, Liguo
Pauli, Florian
Zhang, Shimin
Hambrecht, Fabian
Hameyer, Kay
Powiązania:
https://bibliotekanauki.pl/articles/2135735.pdf
Data publikacji:
2022
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cooling
insulation system
particle contamination
partial discharge
surface resistance
Opis:
An integration of the electrical machine and the gearbox is attracting particular attention for the design of modern electric and hybrid drive trains, since it saves overall space and subsequently increases the power density. Another benefit of a high level of integration is that it enables a combined application of oils as both cooling fluid for the electrical machine and as lubrication fluid for the transmission system. In this way, the power density of the integrated drive train can be further increased. During the oil cycling, conductive contaminations may be introduced and subsequently have an influence on the function of the insulation system of the electrical machine. In the present work, the influences of the cooling oil and its conductive contaminations, conductive particles as well as their combination with humidity, on the electrical and dielectric properties of the insulation system are studied. The results show that by application of the cooling oil, the partial discharge inception voltage (PDIV) of the winding insulation increases significantly so that an electrical breakdown is prone to happen before a partial discharge (PD) occurs. With increasing particle contamination, the PDIV of the insulation system decreases significantly, while the capacitance increases. Besides, conductive particles and humidity decrease the surface resistance and surface breakdown voltage of the insulation papers significantly. The results indicate that the conductive particle contaminations can play an important role for the electrical degradation of the insulation system.
Źródło:
Archives of Electrical Engineering; 2022, 71, 3; 789--804
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Analysis on Acoustic Disturbance Signals Expected During Partial Discharge Measurements in Power Transformers
Autorzy:
Kunicki, Michał
Powiązania:
https://bibliotekanauki.pl/articles/1953519.pdf
Data publikacji:
2020
Wydawca:
Polska Akademia Nauk. Czasopisma i Monografie PAN
Tematy:
acoustic emission
partial discharge
insulation system
measurements
power transformers
Opis:
This paper presents comparative analysis of various acoustic signals expected during partial discharge (PD) measurements in operating power transformer. Main purpose of the paper is to yield relevant and reliable method to distinguish between various acoustic emission (AE) signals emitted by PD and other sources, with particular consideration of real-life results rather than laboratory simulations. Therefore, selected examples of real-life AE signals registered in seven different power transformers, under normal operation conditions, within few years are showed and analyzed. Five scenarios are investigated, which represent five types of AE sources: PD generated by artificial sources, and next four real-life sources (including PD in working transformer, oil flow, oil pumps and core). Several different signal processing methods are applied and compared in order to identify the PD signals. As a result, an energy patterns analysis based on the wavelet decomposition is found as the most reliable tool for identification of PD signals. The presented results may significantly support the process of interpretation of the PD measurement results, and may be used by field engineers as well as other researchers involved in PD analysis using AE method. Finally, observed properties also provide a solid basis for establishing or improving complete classification method based on the artificial intelligence algorithms.
Źródło:
Archives of Acoustics; 2020, 45, 4; 733-746
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An extrinsic Fabry–Pérot interference fiber sensor for ultrasonic detection of partial discharge
Autorzy:
Zhang, Ximin
Qian, Sen
Liu, Huixin
Chen, Chuan
Deng, Chuanlu
Hu, Chengyong
Huang, Yi
Powiązania:
https://bibliotekanauki.pl/articles/27310090.pdf
Data publikacji:
2023
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
extrinsic Fabry-Pérot interference
fibre sensor
partial discharge
sensitivity
frequency
Opis:
An ultrasonic sensor based on extrinsic Fabry–Pérot interference (EFPI) has been designed and demonstrated to detect the ultrasonic wave signal. The sensitivity and natural frequency of fiber Fabry–Pérot (F-P) sensor with different structure parameter have been simulated by COMSOL. The simulation results illustrate that the sensitivity is up to 1.737 nm/kPa and the natural frequency is 2.1 MHz, when the silica diaphragm thickness is 2 μm, the radius is 90 μm, and the cavity length is 18 μm. The most suitable parameters have been selected and the F-P sensor has been fabricated. When the ultrasonic signals with the frequencies of 40 kHz and 1.2 MHz are respectively applied to the sensor, the frequencies detected by the EFPI ultrasonic sensor are 39 kHz and 1.21 MHz based on a partial discharge detection experiment for the designed demodulation system. The experimental results show that the sensor can accurately detect ultrasonic signals. As an excellent platform for ultrasonic signal sensing, this EFPI ultrasonic sensing system has great potential applications in partial discharge detection field.
Źródło:
Optica Applicata; 2023, 53, 2; 199--211
0078-5466
1899-7015
Pojawia się w:
Optica Applicata
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer-aided registration of current pulses in polyethylene insulation during the first stage of electrical teering
Komputerowa rejestracja impulsów prądowych w izolacji polietylenowej w pierwszej fazie rozwoju drzewienia elektrycznego
Autorzy:
Gohra, K.
Olesz, M.
Konkel, A.
Powiązania:
https://bibliotekanauki.pl/articles/152075.pdf
Data publikacji:
2003
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
drzewienie elektryczne
wyładowania niezupełne
polietylen
electric treeing
partial discharge
polyethylene
Opis:
The paper presents Labview program for automatic measurements of current pulses in polyethylene insulation during the first stage of electrical treeing. The pulses have a very short duration (ns) and a small level of current, so to make the measurements possible, the differential method was applied. This method allows to compensate the residual dissipative and capacitive current of the control sample by the same current in the standard sample.
Proponowany referat przedstawia aplikację opracowaną na bazie programu LabView współpracującą z oscyloskopem cyfrowym za pośrednictwem karty GPiB. Program ma na celu ciągłą (on-line) rejestrację impulsów prądowych mających charakter niepowtarzalny o krótkich czasach trwania (ns). Rejestrowane impulsy związane są z ruchem ładunku elektrycznego w obszarze przyelektrodowym (układ ostrze-płyta uziemiona), w początkowej fazie drzewienia elektrycznego. Aby mierzyć składową prądu związaną tylko z ruchem ładunku zastosowano metodę wykorzystującą układ wzmacniacza różnicowego. Sygnał pomiarowy w układzie uzyskuje się mierząc spadki napięć na dwóch rezystorach bezindukcyjnych włączonych szeregowo w obwody obu próbek - badanej i wzorcowej. Napięcie z wyjścia wzmacniacza różnicowego rejestrowano oscyloskopem cyfrowym i przesłano do komputera za pomocą karty GPIB. Aplikacja napisana w LabView umożliwia rejestrację i akwizycję wybranych parametrów kolejnych impulsów prądowych, zapisywanych w standardowym formacie pliku tekstowego (spreadsheet).
Źródło:
Pomiary Automatyka Kontrola; 2003, R. 49, nr 12, 12; 71-73
0032-4140
Pojawia się w:
Pomiary Automatyka Kontrola
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Aktywny czujnik antenowy RTD
Active antenna detector RTD
Autorzy:
Paduch, P.
Powiązania:
https://bibliotekanauki.pl/articles/1367488.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
analizator
diagnostyka
wyładowania niezupełne (wnz)
analyzer
diagnostics
partial discharge (PD)
Opis:
The correct detection of partial discharge in a partial discharge analyser requires an appropriate level of pulse amplitude. Thermoresistors PT100 which form part of so called antenna detectors are often used as the source of the measuring signal. The output signal amplitude of such detectors ranges between several to several dozen millivolts. However, the pulse signal amplitude obtained from such a detector is not always sufficient to take a measure using instruments with typical measuring ranges. An antenna detector with an amplifier may be a solution to this problem. This article presents the construction of a passive detector, as well as an active detector developed on that basis. Examples of signals obtained using both types of detector are demonstrated.
Do poprawnej detekcji wyładowań niezupełnych w analizatorze wnz wymagany jest odpowiedni poziom amplitudy impulsów. Jako źródło sygnału pomiarowego wykorzystuje się często termorezystory typu PT100 wchodzące w skład tzw. czujników antenowych (anteny). Amplituda sygnału wyjściowego takich czujników waha się w granicach od kilkunastu do kilkudziesięciu miliwoltów. Nie zawsze jednak amplituda impulsów sygnału uzyskiwanego z takiego czujnika jest wystarczająca do wykonania pomiaru przyrządami o typowych zakresach pomiarowych. Rozwiązaniem tego problemu może być czujnik antenowy ze wzmacniaczem. W artykule przedstawiono typową budowę czujnika pasywnego i opracowanego na jego podstawie czujnika aktywnego. Pokazano przykładowe sygnały uzyskiwane z obu typów czujników.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2016, 3, 111; 21-24
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Calibration and Laboratory Testing of Computer Measuring System 8AE-PD Dedicated for Analysis of Acoustic Emission Signals Generated by Partial Discharges Within Oil Power Transformers
Autorzy:
Witos, F.
Szerszeń, G.
Opilski, Z.
Setkiewicz, M.
Olszewska, A.
Duda, D.
Maźniewski, K.
Szadkowski, M.
Powiązania:
https://bibliotekanauki.pl/articles/177029.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
multichannel system
calibration
acoustic emission
partial discharge
power oil transformers
Opis:
In the paper, there are presented a general description of the constructed measuring system 8AE-PD, the results of calibration of this system by the Hsu-Nielsen method as well as the testing of the measuring system during recording signals generated by Hsu-Nielsen sources in a steel plate and a modeled partial discharge (PD) source. There is also presented the methodology of investigations by the calibrated acoustic emission method. The results of analyses of PD signals coming from the modeled sources are given. In particular, there are described the properties of acoustic emission (AE) signals generated by the PDs as well as the dependencies of the peak-to-peak voltage Umm, the RMS voltage Urms and the descriptors of acronyms ADP and ADC on the apparent charge Q introduced by the modeled PD source. There are determined the limit values of the apparent charge Q introduced by the modeled PD source for which the recorded signal is identified as originating from the PDS.
Źródło:
Archives of Acoustics; 2017, 42, 2; 297-311
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Measurement and Analysis of Partial Discharge using an Ultra-High Frequency Sensor for Gas Insulated Structures
Autorzy:
Wang, G.
Kil, G.-S.
Powiązania:
https://bibliotekanauki.pl/articles/221519.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
gas insulated structures
partial discharge
ultra-high frequency sensor
conversion
Opis:
Although the gas insulated structures have a high degree of reliability, the unavoidable defects are primary reason of their failures. Partial discharge (PD) has been regarded as an effective indication for condition monitoring and diagnosis of gas insulated switchgears (GISs) to ensure their reliable and stable operation. Among various PD detection methods, the ultra-high frequency (UHF) technique has the advantages of on-line motoring and defect classification. In this paper, there are presented 7 types of artificial electrode systems fabricated for simulation of real insulation defects in gas insulated structures. A real-time measurement system was developed to acquire defect patterns in a form of phase-resolve partial discharge (PRPD) intensity graph, using a UHF sensor. Further, the discharge distribution and statistical characteristics were extracted for defect identification using a neural network algorithm. In addition, a conversion experiment was proposed by detecting the PD pulse simultaneously using a non-induction resistor and a UHF sensor. A relationship between the magnitude of UHF signal and the amplitude of apparent charge was established, which was used for evaluation of PD using the UHF sensor.
Źródło:
Metrology and Measurement Systems; 2017, 24, 3; 515-524
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Przegląd deskryptorów akustycznych w dziedzinie czasu umożliwiających ocenę wyładowań niezupełnych
Review of acoustic descriptors in the domain of the allowing evaluation of partial discharge
Autorzy:
Kucharska, B.
Powiązania:
https://bibliotekanauki.pl/articles/327384.pdf
Data publikacji:
2006
Wydawca:
Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
Tematy:
deskryptory
emisja akustyczna
wyładowania niezupełne
descriptors
acoustic emission
partial discharge
Opis:
W artykule scharakteryzowano podstawowe deskryptory emisji akustycznej w dziedzinie czasu. Przedstawiono przykładowe wyniki pomiarów wybranych deskryptorów EA. Oceniono przydatność poszczególnych parametrów do opisu zjawiska wyładowań niezupełnych.
In the paper basic acoustic descriptors in the domain of time were characterized. Examples of the measurements of different descriptors were presented. Usefulness of particular parameters for the analysis of partial discharges was estimated.
Źródło:
Diagnostyka; 2006, 3(39); 143-148
1641-6414
2449-5220
Pojawia się w:
Diagnostyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diagnostyka off-line izolacji uzwojeń turbogeneratorów metodą pomiarów wyładowań niezupełnych
Diagnostic of the turbogenerator windings with use off-line partial discharge measurement
Autorzy:
Kandora, W.
Powiązania:
https://bibliotekanauki.pl/articles/1368768.pdf
Data publikacji:
2012
Wydawca:
Sieć Badawcza Łukasiewicz - Instytut Napędów i Maszyn Elektrycznych Komel
Tematy:
wyładowania niezupełne
pomiary off-line
turbogenerator
off-line
partial discharge measurement
Opis:
Paper contain laboratory study of partial discharge (PD) measurement on turbo-generator bars with a voids. Noise influence during PD measurement and theirs elimination were described. Some partial dis charge patterns and PD interpretation were showed.
Źródło:
Maszyny Elektryczne: zeszyty problemowe; 2012, 1, 94; 99-104
0239-3646
2084-5618
Pojawia się w:
Maszyny Elektryczne: zeszyty problemowe
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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