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Dissertations / Theses on the topic 'Protective relays'

Author: Grafiati

Published: 4 June 2021

Last updated: 26 July 2025

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1

DUQUE, CARLOS AUGUSTO. "TESTS OF PROTECTIVE RELAYS UNDER TRANSIENT REGIME." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1990. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=14090@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>Testes de relés de proteção têm assumido maior importância como resultado dos avanços tecnológicos. Novos relés podem ser projetados para atuarem rápido, sendo particularmente sensíveis a parte transitória da falta que eles supostamente detetam. Procedimentos usuais para testes de relés utilizam arquivos obtidos durante testes de falta, ou através de programas de simulação como o EMTP. Entretanto é muito difícil caracterizar um conjunto de formas de onda como suficiente para t

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2

Hunt, Richard K. "Hidden Failure in Protective Relays: Supervision and Control." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36571.

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This thesis performs simulations of a relay supervisory system (RSS) that works passively in conjunction with the existing protective relaying system at a substation. During normal system operating conditions, the RSS supervises the relay system to prevent trips due to hidden failures. During wide area network disturbances, it adapts the relay system to increase security of the power system. The RSS works passively in the sense that it waits for events to occur in the existing relay system before taking any action. The simulation performed includes a model of the RSS, along with simplified

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3

Harris, Raymond Trevor. "Replacement of seven 132/66 kv distance protection schemes by means of a generic relay implemented as a strategic spare." Thesis, Port Elizabeth Technikon, 2000. http://hdl.handle.net/10948/34.

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Eskom is experiencing problems in the field of protection maintenance and in-service breakdowns which negatively influence the quality of electrical supply to the consumer, an integral component of the utility business. These facts initiated the research into the further development of a generic relay to be implemented as a strategic spare for the replacement of several schemes operating within Eskom’s southern region. These include the electromechanical, solid state and numerical distance protection relay and scheme failures on the 132 / 66 kV feeder network. Hence, the primary objective of t

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4

Qadri, Syed Saadat. "A systematic approach to setting underfrequency relays in electric power systems /." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116022.

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Generation loss contingencies in electric power systems result in a deviation of system frequency from nominal, a condition which must be corrected promptly in order to prevent further degradation of the power system. Automatic load-shedding using underfrequency relays is one of the techniques used to correct abnormal frequency deviations and prevent the risk of uncontrolled outages. If sufficient load is shed following a contingency to preserve interconnections and keep generators on-line, the system can be restored with relative speed and ease. On the other hand, if a declining frequency con

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5

Ristanovic, Dragan. "New methodology for transmission line relay testing and evaluation using advanced tools." Texas A&M University, 2003. http://hdl.handle.net/1969.1/355.

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Protective relays are important parts of the power system. The protection guards valuable equipment, and protective relays play a vital role in performing the task. The relay detects fault conditions within an assigned area, opens and closes output contacts to cause the operation of other devices under its control. The relay acts to operate the appropriate circuit breakers to prevent damage to personnel and property. To ensure consistent reliability and proper operation, protective relay equipment must be evaluated and tested. The importance of the relay evaluation issue is linked to capabili

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6

Liang, Feng. "Performance enhancement of digital relays for transmission line distance protection /." Internet access available to MUN users only, 2003. http://collections.mun.ca/u?/theses,153681.

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7

Mohammadi, Houshang C. "Short-circuit current calculations and protective relay coordination for industrial and commercial power systems." Ohio : Ohio University, 1986. http://www.ohiolink.edu/etd/view.cgi?ohiou1183141301.

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8

Zahra, Fathima. "Artificial neural network approach to transmission line relaying." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape11/PQDD_0001/MQ42465.pdf.

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9

Xu, Ran. "Loss of field protection and its impact on power system stability." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Fall2009/r_xu_120109.pdf.

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Thesis (M.S. in electrical engineering)--Washington State University, December 2009.<br>Title from PDF title page (viewed on Jan. 28, 2010). "School of Electrical Engineering and Computer Science." Includes bibliographical references (p. 99-101).

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10

Patel, Daxe. "Modeling and testing of an instantaneous overcurrent relay using VTB and VTB-RT." Master's thesis, Mississippi State : Mississippi State University, 2006. http://sun.library.msstate.edu/ETD-db/ETD-browse/browse.

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11

Palla, Sunil Kumar. "Development of overcurrent relay model and power system simulator using National Instruments devices in real-time." Master's thesis, Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-09252008-094620.

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12

Zhang, Yujie. "Model-based design of a protection scheme for shipboard power systems." Master's thesis, Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-09292008-124423.

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13

Covre, Helber Peixoto. "Integração de dados dos sistemas de proteção de subestações distribuidoras." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-12032012-123239/.

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Nas subestações das grandes concessionárias de distribuição de energia elétrica coexistem sistemas de proteção com diferentes tecnologias, formados por relés eletromecânicos, estáticos e digitais, que, em alguns casos, continuarão funcionando por algumas décadas. Essa diversidade de tecnologias implica em sistemas com características de hardware e software diferentes, o que dificulta a implantação de funcionalidades locais e remotas que sejam interoperáveis. Dessa forma, torna-se interessante desenvolver um sistema baseado nas diferentes plataformas de proteção do mercado, com o objetivo de in

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14

Dewadasa, Jalthotage Manjula Dinesh. "Protection of distributed generation interfaced networks." Thesis, Queensland University of Technology, 2010. https://eprints.qut.edu.au/43681/1/Jalthotage_Dewadasa_Thesis.pdf.

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With the rapid increase in electrical energy demand, power generation in the form of distributed generation is becoming more important. However, the connections of distributed generators (DGs) to a distribution network or a microgrid can create several protection issues. The protection of these networks using protective devices based only on current is a challenging task due to the change in fault current levels and fault current direction. The isolation of a faulted segment from such networks will be difficult if converter interfaced DGs are connected as these DGs limit their output currents

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15

Husen, Khalid, and Mousa Fadi Imad. "Implementation Av Reläskyddssamverkan : En studie om en effektiv reläskyddssamverkan med hjälp av längsdifferentialskyddets kommunikationskanaler." Thesis, KTH, Hälsoinformatik och logistik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-296485.

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En tranmissionsledning är delen av elsystemet som överför ström från kraftverk till slutanvändare. Därför är det av vikt att en transmissionslinje alltid ska vara skyddad. Syftet med detta examensarbete var att utveckla och prova en konfiguration av teleskyddsschema med kommunikation mellan två reläskydd med distans- och jordfelsskydd över längsdifferentialskyddets kommunikationskanaler. Detta för att skydda elnätet och koordinera utlösningstiden. Konfigurationen av reläskydden har utvecklats med mjukvaran ABB PCM600, och funktionerna som valdes är adekvata funktioner för distansskydd, jordfe

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16

Silveira, JosÃ Giordane. "Sistema para SeleÃÃo AutomÃtica de Grupos de Ajustes em RelÃs de ProteÃÃo." Universidade Federal do CearÃ, 2011. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6881.

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Os modernos sistemas de mediÃÃo, proteÃÃo, comando, controle e supervisÃo (MPCCS) tÃm contribuÃdo de forma significativa para o aumento da seguranÃa, confiabilidade e continuidade de serviÃo dos sistemas elÃtricos de potÃncia. O sistema de proteÃÃo Ã parte relevante desse sistema multifuncional, o qual tem como objetivo principal manter a integridade do sistema elÃtrico quando submetido a um distÃrbio, garantindo a seguranÃa de pessoas e assegurando a continuidade de serviÃo da porÃÃo nÃo envolvida no problema. Para tanto, o sistema de proteÃÃo deve atender a alguns requisitos bÃsicos tais co

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17

Silva, Chrystian Dalla Lana da. "Estimação fasorial aplicada a relés de proteção numéricos utilizando os métodos de ajuste de curvas e redes neurais artificiais." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/8536.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This dissertation proposes two methodologies for the phasor estimation on protective relays in Electrical Power Systems. Firstly, a theoretical introduction of signal processing, the structure of a protective relay and phasor estimation algorithms is presented, including some of the algorithms used on the electrical system, as well as the two proposed methodologies. The first one makes use of the concept of curve-fitting, while the other uses Artificial Neural Networks, both with the goal of performing the real-time estimation of t

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18

Hamilton, Hymiar. "An impact study of DC protection techniques for shipboard power systems." Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-07062007-144823.

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19

Delvecchi, Esloany Daisy Carniatto. "Análise de novos sinais para a detecção de ilhamento de geradores síncronos distribuídos." [s.n.], 2011. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259999.

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Orientadores: Walmir de Freitas Filho, José Carlos de Melo Vieira Júnior<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-08-19T11:09:25Z (GMT). No. of bitstreams: 1 Delvecchi_EsloanyDaisyCarniatto_M.pdf: 1048681 bytes, checksum: 837e57f3ee3363dd7bb9f49a72408fe1 (MD5) Previous issue date: 2011<br>Resumo: Geradores síncronos conectados em redes de distribuição de energia elétrica estão sujeitos a operarem de forma ilhada após a ocorrência de distúrbios na rede elétrica. Ilhamento ocorre quando u

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20

Runa, Erik. "Användning av smarta mätare som driftövervakare i lågspänningsnät." Thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-34292.

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I detta examensarbete utreds möjligheten att med hjälp av nya smarta elmätare få en ökad inblick i elkvalitén i elnäten samt att ge nätägare möjligheten att automatiskt eller via fjärrsignal koppla bort solcellsanläggningar i de fall de orsakar dålig elkvalité. Motiveringen till studien har varit att en ökad utbyggnad av solcellsanläggningar med tilhörande växelriktare och en trolig framtida ökning av snabbladdare och andra olinjära laster i näten ökar utmaningen för elnätsföretag att klara gällande krav på elkvalité. Samtidigt har utvecklingen av elmätare gjort att de idag har många funktione

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21

Hjertberg, Tommy. "Fault energy implications of distributed converter interfaced generation : A case study of an underground mine grid." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-300903.

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Adding Power Electronic Interfaced Devices (PEID) generation to grids is an increasing trend because of the concurrent development of better power electronic converters and a greater interest in a better utilisation of energy resources. Small and dispersed energy sources that would previously not be worth introducing into the grid is becoming more and more viable and other potential benefits such as better control of voltage levels and smoothing out load changes also spur this development. But while there are great potential benefits of the controllability of these devices there are also risks

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22

Chin, Nyun-Fook. "Polyphase directional detection for power system protection." Thesis, University of Bath, 1994. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.260263.

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23

Gabriel, Janio Denis. "Desenvolvimento do protótipo de um relé digital para geração distribuída com integração para redes inteligentes." Universidade Tecnológica Federal do Paraná, 2013. http://repositorio.utfpr.edu.br/jspui/handle/1/608.

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Com novas normas, incentivos governamentais e preocupação com questões ambientais, é esperado um crescimento no número de unidades de geradoras conectadas a rede a partir dos consumidores. Algumas questões técnicas relacionadas à elevada penetração de geração distribuída nos alimentadores de distribuição preocupam as concessionárias de energia, as quais buscam meios de prevenir possíveis efeitos indesejados no sistema elétrico. Esta pesquisa apresenta o desenvolvimento de um relé digital aplicado à proteção da conexão de geração distribuída na rede elétrica, com foco em microgeração e minigera

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24

Dunn, Ian. "Computer aided design of protection systems for electrical drives." Thesis, University of South Wales, 1994. https://pure.southwales.ac.uk/en/studentthesis/computer-aided-design-of-protection-systems-for-electrical-drives(083070e9-5cde-45e7-8bbd-e25f8f9c4742).html.

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The contents of this thesis describe the results of an investigation into the means by which computer aided design (CAD) may be applied to the protection systems of electrical drives, removing much of the repetitive procedures presently used in determining relay settings. To further this aim, a series of algorithms have been devised which allow exploitation of the concept. The areas chosen for demonstration are, direct-on-line started induction motors and transformer fed variable speed drives. In both cases "standard settings' cannot be implemented as the field of application varies enormously

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Shi, Dayu. "Development of system-on-a-chip based protection relays." Thesis, University of Liverpool, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539741.

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26

Ahmed, Moin. "FPGA based morphological filters for power system protection relays." Thesis, University of Liverpool, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.539919.

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Dines, Joseph. "Investigation into the protection of microgrids using adaptive relays." Thesis, Dines, Joseph (2016) Investigation into the protection of microgrids using adaptive relays. Honours thesis, Murdoch University, 2016. https://researchrepository.murdoch.edu.au/id/eprint/35813/.

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Due to a proliferation of renewable power sources and a rise in distributed generators, the transmission network is now able to split into smaller isolated sections. These sections are often referred to as microgrids as they function similar to larger networks with power production being sufficient to power the loads. Microgrids are hampered by the lack of fault current being sufficiently high to operate traditional overcurrent protection. The lack of fault current has resulted in a need to find newer methods to provide fault protection. One such method is the use of modern relays that allow f

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Bonnard, Charles-Henri. "Méthodes d’évaluation du comportement des limiteurs de courant de court-circuit supraconducteurs résistifs intégrés dans des simulateurs de réseaux électriques." Thesis, Université de Lorraine, 2017. http://www.theses.fr/2017LORR0058/document.

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Les limiteurs de courants de court-circuit supraconducteurs sont des appareillages à fort potentiel pour les réseaux électriques. En effet, ils offrent une limitation efficace dès les premiers instants du court-circuit. On peut qualifier la limitation de "naturelle", c’est-à-dire qu’elle est intrinsèquement liée aux caractéristiques du matériau et ne nécessite pas de commande particulière. Afin de faciliter la conception et l’intégration des limiteurs de courant de court-circuit supraconducteurs résistifs (rSFCL) destinés aux réseaux électriques, il est nécessaire de disposer de modèles de sim

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29

Mouton, A. J. J., C. J. Smith, and G. E. Smith. "An efficient communication interface and protocol for motor protection relays." Journal for New Generation Sciences, Vol 7, Issue 1: Central University of Technology, Free State, Bloemfontein, 2009. http://hdl.handle.net/11462/524.

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Published Article<br>A company in South Africa is a three-phase induction motor protection relay manufacturer. The function of the protection relay is to capture running data, to provide protection against possible damage, to control an electric motor and to communicate this data to the System Control and Data Acquisition (SCADA) system in a control room. In the case of remote sites e.g. a pump station, the protection relays are used as standalone units. The protection relays are equipped with communication facilities to be used in an instrumentation environment. If a trip occurs or settings n

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Alshamali, M. A. M. "Rationalised protection for embedded generation." Thesis, Queen's University Belfast, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368481.

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31

Lwana, Mkuseli. "Investigation of 3 terminal differential protection using standard-based numerical relays." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2578.

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Thesis (MTech (Electrical Engineering))--Cape Peninsula University of Technology, 2017.<br>Transmission lines are a vital part of the electrical distribution system, as they provide the path to transfer power between generation and load. Factors like de-regulated market environment, economics, etc. have pushed utilities to operate transmission lines close to their operating limits. Any fault, if not detected and isolated quickly will cascade into a system wide disturbance causing widespread outages for a tightly interconnected system operating close to its limits. Current differential criterio

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Piesciorovsky, Emilio C. "Relay in the loop test procedures for adaptive overcurrent protection." Diss., Kansas State University, 2015. http://hdl.handle.net/2097/20537.

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Doctor of Philosophy<br>Electrical and Computer Engineering<br>Anil Pahwa<br>Noel N. Schulz<br>Microgrids with distributed generators have changed how protection and control systems are designed. Protection systems in conventional U.S. distribution systems are radial with the assumption that current flows always from the utility source to the end user. However, in a microgrid with distributed generators, currents along power lines do not always flow in one direction. Therefore, protection systems must be adapted to different circuit paths depending on distributed generator sites in the microgr

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Alanzi, Sultan. "Analysis of a Major Electric Grid – Stability and Adaptive Protection." The Ohio State University, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=osu1365969976.

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Cassata, Joseph Frank. "Relay Protection Scheme for Special Power Flow Controllers." Youngstown State University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=ysu1595355623363128.

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Thompson, Adam Craig. "The Future of Substations: Centralized Protection and Control." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/73177.

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Modern power substations continue to use hardware that is dated and resistant to modernization. This document discusses the basics of substations, identifies their weaknesses, and suggests a method of improvement. This suggestion implements a centralized protection and control system to make the overall system more robust and flexible to the ever changing power system landscape.<br>Master of Science

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Abyaneh, Hossein Askarian. "Assessment of IDMT and distance relay settings." Thesis, University of Manchester, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.332331.

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Gebs, Christopher. "Protection of capacitor banks : Nuisance tripping of overcurrent relays; causes and possible remedies." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elkraftteknikk, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22635.

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The origin of this master thesis is Statnett having problems with nuisance tripping of capacitor banks. Their own measurements are said to indicate that harmonics are confusing the overcurrent relays. Disconnecting a large capacitor bank from the transmission system can have large consequences for the stability of the system. Consequently any nuisance tripping such as Statnett has experienced should not be allowed to happen again. Measures must be taken to increase the security of the protection system. The aim of this thesis is to investigate the overloading of capacitor banks and operation o

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Siyambalapitiyage, Berty. "Protection of ungrounded systems using an advanced relay element." Thesis, Siyambalapitiyage, Berty (2010) Protection of ungrounded systems using an advanced relay element. Other thesis, Murdoch University, 2010. https://researchrepository.murdoch.edu.au/id/eprint/4066/.

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The aim of this thesis project is to investigate single line to ground faults in an ungrounded system and determine an effective fault detection method. Ungrounded system analysis is conducted using ICAP simulation. The fault detection method is focused on three different parts. The first part is used to identify the faulted feeder. Second part is for identifying the faulted phase and the last part is for estimating the fault distance. After simulating the model of an ungrounded system using ICAP, it can be observed that when a ground fault is present, the voltage magnitude of the unfau

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Joyeux, Patrice. "Modélisation d'un relais polarisé haute sensibilité." Grenoble INPG, 2000. http://www.theses.fr/2000INPG0146.

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Dans tous les domaines, mais en particulier celui de électricité, chacun se préoccupe de plus en plus de la sécurité des utilisateurs, tant au niveau des biens que des personnes. Pour cela on utilise des appareils à coupure automatique de I'alimentation, dès I'apparition d'un défaut électrique dans une installation. Cette protection est réalisée par des dispositifs différentiels, dont le coeur est constitué d'un relais polarisé haute sensibilité. L'amélioration de celle-ci exige une maitrise complète des caractéristiques du relais. Or les différentes pièces le constituant présentent certaines

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Quigley, Brian David. "Diagnostic relapse in Borderline Personality Disorder: risk and protective factors." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/1237.

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Borderline Personality Disorder (BPD) is one of the more common personality disorder diagnoses observed in psychiatric inpatients and outpatients. Previous studies have found that individuals with BPD may be expected to experience difficulties throughout their lifetimes and they may repeatedly return for psychological treatment. Whereas previous studies have attempted to identify various factors related to relapse in other chronically recurring disorders such as depression, schizophrenia, and substance abuse, studies examining factors associated with relapse in BPD, and personality disorders

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McGivern, Christopher. "Design and implementation of a standalone motor protection relay apparatus." Thesis, McGivern, Christopher (2016) Design and implementation of a standalone motor protection relay apparatus. Honours thesis, Murdoch University, 2016. https://researchrepository.murdoch.edu.au/id/eprint/35883/.

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Motor protection relays (MPR) are crucial in the protection of electrical circuits and can be implemented in a variety of industries to protect a plethora of electrical equipment. The way in which protections are implemented can vary greatly and in the case of this report the protection relay selected was a Schneider Sepam M41, which is used for the protection of industrial-type induction motors. The MPR is a crucial piece of equipment within an electrical circuit. Incorporated correctly, a MPR can potentially save a business a significant amount of money and time if a fault condition is o

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Dolloff, Paul A. "An improved bus protection technique with dissimilar current transformers." Thesis, Virginia Tech, 1995. http://hdl.handle.net/10919/46432.

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Assumpção, Felipe Framil. "Validation of Results of Smart Grid Protection through Self-Healing." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7468.

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This is a verification of the results of “Smart Grid Protection through Self-Healing” from the publication of Chathurika Chandraratne, et al., that proposes a protection solution for the smart grid. The paper used as reference has as the main focus on three different protections; directional overcurrent protection, overcurrent protection, and transformer protection, which are validated through ETAP software simulation of IEEE- 9 bus and 14 bus electrical power systems, the same used by the author. It was validated after repeated simulation, that just as intended, self-healing increases system

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Osborn, Christopher Eric. "Protection, Automation, and Frequency Stability Analysis of a Laboratory Microgrid System." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1828.

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Due to increasing changes in the power industry, Cal Poly San Luis Obispo's electrical engineering department introduced a set of initiatives to adequately equip students with the skills and knowledge to interact with new technologies. Specifically, the department proposed a microgrid and power systems protection and automation laboratory to strengthen students' knowledge of microprocessor-based relays. This paper outlines a microgrid laboratory system that fulfills the initiative's goal and proposes a collection of laboratory experiments for inclusion in a new laboratory course at Cal Poly. T

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Sefidpour, Sepehr. "Pilot Protection Based on Directional Detection." Thesis, KTH, Elektriska energisystem, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-119249.

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Nowadays two main types of protection schemes widely used in protection of transmission lines are: distance protection and differential protection schemes. However, it has been noticed from industrial practice that the distance protection scheme used today generally is limited in tripping speed and selectivity. Also differential protection scheme is influenced by the time synchronization of samples in both relays installed at transmission line terminals. On the other hand, among various pilot protection schemes for protection of Extra High Voltage (EHV) / Ultra High Voltage (UHV) transmission

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Mohammadi, Houshang. "Short-circuit current calculations and protective relay coordination for industrial and commercial power systems." Ohio University / OhioLINK, 1986. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1183141301.

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Cho, Sungmin. "Modeling and testing of digital protection relay for an induction motor." Thesis, Cho, Sungmin (2010) Modeling and testing of digital protection relay for an induction motor. Other thesis, Murdoch University, 2010. https://researchrepository.murdoch.edu.au/id/eprint/4117/.

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The project details the modelling of the induction motor SEL701 Relay in PowerFactory. In order to prove operational reliability, both off-line and on-line testing were implemented to verify the characteristic curve of the relay by measuring trip times. Prior to modelling the relay, the thermal limit curves of the motor were studied to scheme the motor protection relay. In addition, the requirement of motor protection is discussed and the elements of a protection relay corresponding to the requirements are presented. The results indicate that the off-line (simulation) and on-line test have con

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Bonnard, Charles-Henri. "Méthodes d’évaluation du comportement des limiteurs de courant de court-circuit supraconducteurs résistifs intégrés dans des simulateurs de réseaux électriques." Electronic Thesis or Diss., Université de Lorraine, 2017. http://www.theses.fr/2017LORR0058.

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Les limiteurs de courants de court-circuit supraconducteurs sont des appareillages à fort potentiel pour les réseaux électriques. En effet, ils offrent une limitation efficace dès les premiers instants du court-circuit. On peut qualifier la limitation de "naturelle", c’est-à-dire qu’elle est intrinsèquement liée aux caractéristiques du matériau et ne nécessite pas de commande particulière. Afin de faciliter la conception et l’intégration des limiteurs de courant de court-circuit supraconducteurs résistifs (rSFCL) destinés aux réseaux électriques, il est nécessaire de disposer de modèles de sim

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Xu, Ke. "INTELLIGENT METHODS FOR OPTIMUM ONLINE ADAPTIVE COORDINATION OF OVERCURRENT RELAYS." UKnowledge, 2018. https://uknowledge.uky.edu/ece_etds/127.

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During the operation in a modern power distribution system, some abnormal events may happen, such as over-voltage, faults, under-frequency and overloading, and so on. These abnormal events may cause a power outage in a distribution system or damages on the equipment in a distribution system. Hence these abnormal events should be identified and isolated by protection systems as quickly as possible to make sure we can maintain a stable and reliable distribution system to supply adequate electric power to the largest number of consumers as we can. To sum up, we need stable and reliable protection

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Wang, Hualei. "The protection of transmission networks containing AC and DC circuits." Thesis, University of Bath, 2015. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.655718.

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In 14th August 2003, the Northeast USA suffered its worst power outage event in history. The power disturbance spreading through the system caused mal-trips of the distance relay remote back-up protections, which indeed contributed to the power outage cascading a wide area. The power outage in the Northeast USA was constrained by the presence of HVDC interconnections between the HVAC networks in Ontario and New York. The system collapse did not progress beyond the HVDC interconnection interface with Quebec. The HVDC link can regulate the voltage and current therefore impacts on the performance

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