Дисертації з теми "Stator short circuit faults"
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Arkan, Muslum. "Stator fault diagnosis in induction motors." Thesis, University of Sussex, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310244.
Повний текст джерелаBabu, Hareesh. "Finite-element analysis of an induction motor with inter-turn short-circuit faults." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-290082.
Повний текст джерелаKortslutning mellan varven i en asynkronmotors statorlindning (ITSC) är en av de vanligaste källorna för fel som påverkar dess drifttillförlitlighet. I detta examensarbete utvecklas en finit-element (FE) modell för att studera ITSC- fel. FE-modellen är utvecklad för en asynkronmotorprototyp som kan emulera ITSC-fel. Med den utvecklade modellen utförs en simuleringsstudie för att förstå beteendet hos olika elektriska och magnetiska egenskaper både i tids- och frekvensdomän. Dessa egenskaper är goda indikatorer av statorlindningsfel och kan därför med fördel användas i ett tillståndsövervakningssystem. Prototypmaskinen har testats experimentellt och de erhållna resultaten jämförs med FE-simuleringen och analysresultaten. Det analytiska resultatet, FEM- simuleringarna och den experimentella utvärderingen uppvisade god överrensstämmelse vad gäller felströmmen. Dock finns det en mindre avvikelse när det gäller amplituden hos statorströmmens negativa fasföljd. Orsaken till denna avvikelse är att prototypmaskinens geometri inte är helt känd.
Singh, Bhanu Pratap. "Real-time detection of stator resistance unbalances in three phase drives." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-286813.
Повний текст джерелаUppskattningsvis 30% av alla fel i induktionsmaskiner (IM) är kopplad till dess stator. Dessa fel är i huvudsak Inter-Turn Short Circuit (ITSC)-fel, dvs. två lindningar inom IM:ens stator blir kortsluta pga. ett isoleringsfel. Emellertid kan man undvika ITSC-fel genom att detektera dem i förhand och planera underhåll. Det här examensarbetet undersöker två metoder för att detektera ett förestående ITSC-fel i en tre-fas IM. Den första metoden är baserad på asymmetrin i IM:er pga. ITSC-felet. Resultatet av den här asymmetrin är att en negativ sekvens genereras i IM:ens statorspänning och statorström. En oskadad IM kan också visa dessa negativa sekvenser pga. tillverksprocessen och statorspänningsobalanser. Egenskaperna och kompensationsmetoderna för dessa negativa sekvenser i en oskadad IM kommer att diskuteras. Resultaten visar att efter kompenseringen av de negativa sekvenserna i en oskadad IM, kan de användas för att detektera ITSC-fel och efteråt för att beräkna felstorheter och även statormotståndobalanser. Den andra metoden för att detektera ITSC-fel är baserad på en undersökning av statormotståndobalanser. Ett tre-fas-drivsystem används för att injektera likspänning i den stationära referensramen. Likströmmen som följer av denna likspänning mäts och statorfasmotstånden beräkna efteråt med Ohms lag. I en oskadad IM är fasmotstånden balanserade. Däremot, när ett ITSC-fel uppstår i en fas, avviker fasmotståndet i den felaktiga fasen från de andra två fasernas, vilket kan användas för att detektera ITSC-fel.
Filleau, Clément. "Mise en place d'une méthodologie de modélisation en vue du diagnostic des défauts électriques des alternateurs." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/19288/1/Filleau.pdf.
Повний текст джерелаIsaac, Leslie Thomas. "Puffer circuit breaker diagnostics using novel optical fibre sensors." Thesis, University of Liverpool, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263762.
Повний текст джерелаOliveira, Ãtila GirÃo de. "Neural classifier aplied in stator winding inter-turn short circuit in three-phase induction motors driven by frequency converter." Universidade Federal do CearÃ, 2014. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=12285.
Повний текст джерелаThis dissertation reports applications of artificial neural networks to detect stator winding interturn fault of three phase induction motor drived by frequency inverter. The artificial neural networks, like Simple and Multilayer Perceptron, served as off-line classifiers to short-circuit fault condition or healthy condition. In the training of Multilayer Perceptron, two different algorithms are used: the error back-propagation, which is a classic algorithm, and the extreme learning machine, as a relative new alternative for the classic back-propagation. The new one is more worthwhile because of its implementation easiness and higher speed of computation. The database used on the training and validation of the networks is created from an experimental setting, therefore it is composed by true data. The attributes used as failuresâ indicators are selected from certain frequencies of the spectrum, based on some theories of current signature analysis. In the second instance, the technique of principal components analysis is employed. The results obtained for the designed classifiers are shown, and some considerations are made on their use in real time embedded applications, which is the most important projection for future researches.
Este trabalho deriva da aplicaÃÃo de redes neurais artificiais para a detecÃÃo de curto-circuito entre espiras em motor de induÃÃo trifÃsico, acionado por inversor de frequÃncia. As redes neurais artificiais, do tipo Perceptron Simples e Multicamadas, sÃo usadas para detectar falhas de curto-circuito no bobinamento estatÃrico de motores de induÃÃo trifÃsicos de forma off-line. Para treinamento do Perceptron Multicamadas sÃo usados dois algoritmos distintos: o error back-propagation, que figura como o algoritmo clÃssico na literatura especializada, e o extreme learning machine, que à uma alternativa, relativamente recente, ao algoritmo clÃssico. Este algoritmo à uma opÃÃo atraente para o desenvolvimento rÃpido de classificadores. O banco de dados usado para treinamento e validaÃÃo das redes à obtido a partir de experimentaÃÃo laboratorial, portanto composto de dados reais. Os atributos utilizados para a detecÃÃo da falha sÃo componentes de frequÃncia do espectro harmÃnico da corrente estatÃrica do motor. O critÃrio de escolha destas componentes, a priori, à fundamentado em resultados de investigaÃÃes prÃvias da assinatura de corrente e, em segunda instÃncia, à aplicada a tÃcnica de anÃlise de componentes principais. SÃo apresentados os resultados obtidospelos classificadores projetados, e feitas algumas consideraÃÃes quanto à utilizaÃÃo destes em aplicaÃÃo embarcada e em tempo real, que à a principal projeÃÃo de futuros trabalhos a partir do atual.
Martins, João Roberto Deroco. "Detecção e classificação de curto-circuitos em sistemas de distribuição usando rede neural artificial ARTMAP nebulosa /." Ilha Solteira : [s.n.], 2010. http://hdl.handle.net/11449/87047.
Повний текст джерелаBanca: Anna Diva Plasencia Lotufo
Banca: Marco Aparecido Queiroz Duarte
Resumo: Este trabalho apresenta uma metodologia para detecção e classificação de faltas do tipo curto-circuito. Esta operação de diagnóstico tem como principal operador um banco de redes neurais artificiais (RNAs) do tipo ARTMAP Nebulosa. Tal ferramenta segue a principal filosofia das RNAs: o reconhecimento de padrões, através de um trei- namento supervisionado inicial, responsável por atualizar os parâmetros das redes con- comitantemente com os resultados desejados. Finalizada a fase de adaptação, as redes serão capazes de, após receber novos padrões, classificá-los, de forma a propiciar, ao operador, informações importantes quanto ao estado de transmissão de barras presentes em um determinado complexo elétrico. Aqui, tomou-se como modelo a simulação de um grande alimentador real, composto por mais de 800 barras. Aliados às RNAs, tam- bém foram aplicadas, no que se refere à análise de dados amostrados de corrente elétri- ca, duas importantes e flexíveis ferramentas matemáticas: a Transformada de Fourier e a Transformada Wavelet. .Observa-se, ao final do trabalho, que os resultados apresenta- dos são bastante encorajadores, o que possibilitaria a utilização do programa em um ambiente real
Abstract: This work presents a detection and classification of short-circuit faults metho- dology. The main operator of this diagnostic operation is a Fuzzy ARTMAP Artificial Neural Networks (ANN) bank. This tool follows the ANN's main core: pattern recogni- tion, through an initial supervised training stage, responsible for updating the parame- ters of the networks con-comitant with the desired results. Completed the adaptation phase, the network will be able to, after receiving new standards, classifying them in order to provide to the operator important information about the state of transmission of bars present in a given complex electric. Here, there is, like a model, a simulation of a real big feeder, comprising more than 800 bars. Besides the ANNs, two important and flexible mathematical tools were also applied with regard to the analysis of sampled data of electric current: Fourier Transform and Wavelet Transform. At the end of the work the results presented are very encouraging, which would allow the use of the pro- gram in a no simulations real environment
Mestre
Bernardes, Haislan Ranelli Santana. "Detecção e classificação de faltas em sistemas de distribuição de energia elétrica usando a análise multirresolução e a rede neural artificial ARTMAP-fuzzy /." Ilha Solteira, 2019. http://hdl.handle.net/11449/183118.
Повний текст джерелаResumo: Esta pesquisa apresenta o desenvolvimento de uma ferramenta para a detecção e classificação de curtos-circuitos em sistemas de distribuição de energia elétrica, a qual é baseada no uso combinado da análise multirresolução e rede neural ARTMAP-fuzzy. A análise multirresolução permite a identificação de singularidades nas oscilografias e a rede da família ART garante ao sistema classificador a capacidade de aprendizado contínuo de novos padrões sem perder o conhecimento previamente adquirido. Todo o processo de diagnóstico é realizado em uma única etapa, reduzindo o custo computacional da metodologia. A eficiência do sistema é verificada por uma análise direta, na qual se contabiliza a quantidade total de acertos, e por uma avaliação comparativa, a qual envolve a substituição da rede ARTMAP-fuzzy pela rede ARTMAP-Euclideana. Resultados mostram que o sistema é eficiente, sendo capaz de detectar e classificar 100% das falhas elétricas.
Abstract: This research presents the development of a tool for the detection and classification of short circuits in electric power distribution systems, which is based on the combined use of multi-resolution analysis and fuzzy ARTMAP neural network. The multiresolution analysis allows the identification of singularities in the oscillographs and the ART family network guarantees to the classifier the ability to continuously learn new patterns without losing the previously acquired knowledge. The entire diagnostic process is performed in a single step, reducing the computational effort. The efficiency of the system is verified by a direct analysis, in which the total number of hits is counted, and by a comparative evaluation, which involves the replacement of the fuzzy ARTMAP network by the Euclidean ARTMAP network. Results show that the system is efficient, being able to detect and classify 100% of the electrical faults.
Mestre
Martins, João Roberto Deroco [UNESP]. "Detecção e classificação de curto-circuitos em sistemas de distribuição usando rede neural artificial ARTMAP nebulosa." Universidade Estadual Paulista (UNESP), 2010. http://hdl.handle.net/11449/87047.
Повний текст джерелаCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Este trabalho apresenta uma metodologia para detecção e classificação de faltas do tipo curto-circuito. Esta operação de diagnóstico tem como principal operador um banco de redes neurais artificiais (RNAs) do tipo ARTMAP Nebulosa. Tal ferramenta segue a principal filosofia das RNAs: o reconhecimento de padrões, através de um trei- namento supervisionado inicial, responsável por atualizar os parâmetros das redes con- comitantemente com os resultados desejados. Finalizada a fase de adaptação, as redes serão capazes de, após receber novos padrões, classificá-los, de forma a propiciar, ao operador, informações importantes quanto ao estado de transmissão de barras presentes em um determinado complexo elétrico. Aqui, tomou-se como modelo a simulação de um grande alimentador real, composto por mais de 800 barras. Aliados às RNAs, tam- bém foram aplicadas, no que se refere à análise de dados amostrados de corrente elétri- ca, duas importantes e flexíveis ferramentas matemáticas: a Transformada de Fourier e a Transformada Wavelet. .Observa-se, ao final do trabalho, que os resultados apresenta- dos são bastante encorajadores, o que possibilitaria a utilização do programa em um ambiente real
This work presents a detection and classification of short-circuit faults metho- dology. The main operator of this diagnostic operation is a Fuzzy ARTMAP Artificial Neural Networks (ANN) bank. This tool follows the ANN’s main core: pattern recogni- tion, through an initial supervised training stage, responsible for updating the parame- ters of the networks con-comitant with the desired results. Completed the adaptation phase, the network will be able to, after receiving new standards, classifying them in order to provide to the operator important information about the state of transmission of bars present in a given complex electric. Here, there is, like a model, a simulation of a real big feeder, comprising more than 800 bars. Besides the ANNs, two important and flexible mathematical tools were also applied with regard to the analysis of sampled data of electric current: Fourier Transform and Wavelet Transform. At the end of the work the results presented are very encouraging, which would allow the use of the pro- gram in a no simulations real environment
Otava, Lukáš. "Algoritmy monitorování a diagnostiky pohonů se synchronními motory." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-447552.
Повний текст джерелаSouza, Júlio César Nascimento. "MODELAGEM DE REDES AÉREAS COM RETORNO POR TERRA EM SISTEMAS DE DISTRIBUIÇÃO DE ENERGIA ELÉTRICA PARA ANÁLISES DE FALTAS DE ALTA IMPEDÂNCIA." Universidade Federal do Maranhão, 2006. http://tedebc.ufma.br:8080/jspui/handle/tede/409.
Повний текст джерелаThis work focuses on the modeling of single-phase and three-phase distribution with earth return, for high impedance faults analysis. The main motivation is the lack of definitive solutions for such faults. These faults often occur when an overhead conductor breaks and falls on high impedance surface such as asphalt road, cement, trees, among others. That fault is analyzed in a Single wire earth return system - SWER, and in a rural three-phase feeder. The SWER is deduced starting from a generic three-phase system, where simplifications based on practical assumptions are added. Simulations are accomplished in two distribution test systems, with the objective of identifying the behavior pattern of the high impedance faults. It is also included a discussion and analysis of results and suggestions related to future works.
Este trabalho focaliza a modelagem das redes de distribuição monofásicas e trifásicas com retorno por terra, para análise das faltas de alta impedância. A motivação principal está no fato de não existirem soluções definitivas para essas faltas. Este tipo de falta ocorre quando um cabo energizado rompe e cai sobre um tipo de superfície, tal como asfalto, areia, árvores, dentre outros. Essa falta é analisada em uma rede Monofásica com Retorno por Terra MRT em uma rede trifásica rural. A rede MRT é deduzida a partir de uma rede trifásica genérica, onde são adicionadas hipóteses simplificadoras práticas. São realizadas simulações em dois sistemas testes de distribuição, com o objetivo de identificar o padrão de comportamento das faltas de alta impedância. É realizada uma discussão e análise de resultados, sugerindo-se trabalhos futuros.
Duan, Fang. "Diagnostics of rotor and stator problems in industrial induction motors." Thesis, 2010. http://hdl.handle.net/2440/65202.
Повний текст джерелаThesis (M.Eng.Sc.) -- University of Adelaide, School of Electrical and Electronic Engineering, 2010
Chen, Bing-Hua, and 陳柄樺. "Motor Response and Protection for Inverter Short-Circuit Faults." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/5gfch7.
Повний текст джерела國立臺灣大學
機械工程學研究所
106
This paper aims to investigate potential fault characteristics for Permanent Magnet Synchronous Motors (PMSM). The inverter switch short-circuit is the primary focus. When the inverter short-circuit fault occurs, considerable short-circuit currents are induced. They not only damage inverter devices, but also results in the demagnetization in PM motors. Two common inverter short-circuit faults are investigated. They are respectively Symmetric Short-Circuit (SSC) Fault and Asymmetric Short-Circuit (ASC) Fault. For SSC fault, an analytical model is developed for the faulty motor drive. The influence of fault reflected short-circuit currents on PM motors with different parameters are analyzed. It is shown that the short-circuit current can be suppressed by properly selecting the motor parameters. In addition for ASC fault, the fault reflected short-circuit currents are significantly higher than the currents under SSC fault. A hardware protection strategy based on the SSC operating mode is proposed to mitigate these dangerous short-circuit currents, avoiding the risks in PM motors once ASC fault occurs. All the analytical models will be verified by the inverter circuit simulation. In addition, Finite Element Analysis (FEA) is performed to investigate the demagnetization of PM motor under either SSC or ASC fault. Finally, two PM motors with different time constants are experimental evaluated to verity electromagnetic responses after fault.
Δάλλας, Στέφανος. "Υπολογισμός ηλεκτρομαγνητικών μεγεθών και πρόβλεψη συμπεριφοράς μιας σύγχρονης μηχανής με έκτυπους πόλους σε περιπτώσεις σφαλμάτων με τη χρήση της μεθόδου των πεπερασμένων στοιχείων". Thesis, 2012. http://hdl.handle.net/10889/5429.
Повний текст джерелаThis thesis deals with the functional behavior of a salient pole synchronous generator during two kinds of short-circuits. In particular, we studied the case of short circuit in the supply of the excitation winding of the synchronous machine when it is connected to an infinite bus and either the rotor speed was absolutely constant, or a simple PI- Controller maintained the synchronous speed equal to the synchronous. Additionally, the case of an internal fault in the stator winding for the two cases mentioned above was investigated. The electromagnetic torque and the magnetic flux density in each case were calculated and studied, as well as the stator and rotor currents, including the damper cage, and the short-circuit current in the faulty loop of the stator winding. Firstly, it is described in detail the way in which the salient pole synchronous generator was modeled and it is analyzed the method by which the faults are modeled in both stator and rotor and the way these faults were simulated, in the finite element program. Additionally, it is presented the way in how the areas of the model are defined, the equations that were solved through finite element software, in order to extract the results, the definition of the boundary conditions and finally it is described the finite element method, which was applied to this specific model. The case of a short circuit in the supply of the field winding while the stator of the synchronous machine is connected to the grid and the rotor speed is held constant and equal to the synchronous one, is examined. During this fault the magnetic flux, the electromagnetic torque and all the stator and rotor currents are measured in detail. Useful conclusions about the behavior of the machine throughout this kind of short-circuit were derived, all the electromagnetic magnitudes were recorded and an assessment of the generator behavior during this transient phenomenon is made. Similarly, the same type of fault is analyzed, but the speed of the rotor is maintained constant through a speed controller. It is observed that the behavior of the machine and all the electromagnetic magnitudes are quite different compared to the previous case. In this dissertation is examined the behavior of the hydrogenerator in the case of an inter-turn short circuit in the stator winding, while it is connected to the grid with a constant rotor speed. Specifically, it is examined the currents in the rotor and the stator winding for a short circuit between turns that belong to the same or to different phases. The short circuit current is calculated and it is presented the way that it affects quantitative and qualitative the stator phase currents. It is also analyzed the damper currents and it is studied their behavior during the short circuit. The speed controller alters the behavior of the synchronous generator and all the electromagnetic magnitudes of this machine are analytically calculated, resulting significant conclusions on how the faulty loop affects these quantities, while it is set out the role of the participating phases in this short-circuit. Finally, a brief comparison of the way that the number of the shorted turns affects the behavior of the simulated machine in the case of an inter-turn stator fault, while it is connected to the grid with a fixed number of the rotor revolutions. Specifically, it is analyzed the stator and rotor currents and the electromagnetic torque, for the cases that the short-circuited turns belong either to the same or to different phases, but with different number of shorted turns. It is concluded that a key role in determining the electromagnetic magnitudes during this fault has the number of the short-circuited turns and not the number of the phases that are involved in the short circuit.
Chen, Wei-Ta, and 陳煒達. "The Transient States of Wind Farm Short Circuit Faults for Type of Compensators." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/93265860787495627919.
Повний текст джерела國立臺灣海洋大學
機械與機電工程學系
102
Due to the serious impact of global warming on the climate, therefore the world for diversity and energy policy considerations safety aspects, of which wind power as a major new energy. Because of the random fluctuations in wind speed characteristics, when a fault happened, there are some stability problems will be occurred, such as the output power curve, voltage level, etc., of the wind turbine will be change at various wind speed. In this paper, we simulate wind farms due to a short circuit fault by MATLAB/SIMULINK, the effects of the system voltage sag. When the system occurs short circuit, there are four reactive power compensation devices, such as STATCOM, SVC, SSSC, and UPFC, to simulate the impact of the fault on output voltage, active power, and rotor speed, so that the transient state of the system can be quickly to the steady state, and improve the reliability and stability of the system.
Das, Swagata. "Distribution fault location using short-circuit fault current profile approach." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-05-3332.
Повний текст джерелаtext
Wu, Shu Wei, and 吳書緯. "Analysis of Three-Phase Unbalanced Sag Due to Unbalanced Short Circuit Faults in Industrial Distribution Feeder." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/13283788270365327142.
Повний текст джерела長庚大學
電機工程學研究所
96
This thesis aims to study the unbalanced voltage sags of a industrial distribution feeder due to unbalanced short circuit faults. First of all, a single source distribution feeder is used to illustrate the relation between the equipment impedances and unbalanced voltage sags with quantitative formulas by using symmetrical components method. Furthermore, the analysis of voltage sags is considered different types of load. Finally, the power system simulation programs, EMTP, is employed for simulations to verify the correction of formulas.
Vieira, Filomeno de Jesus Moreira. "Modelação, Simulação e Diagnóstico de Avarias no Circuito Magnético Estatórico de Motores de Indução Trifásicos." Master's thesis, 2013. http://hdl.handle.net/10316/40394.
Повний текст джерела