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Dissertations / Theses on the topic 'Overcurrent protection relay'

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Published: 7 June 2025

Last updated: 2 August 2025

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1

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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2

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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3

Bajánek, Tomáš. "Systém chránění s využitím výstupu z elektronického senzorického systému měření proudu a napětí." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2017. http://www.nusl.cz/ntk/nusl-363725.

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At present, there is a widespread use of alternative measurement technologies in electrical networks that include current and voltage sensors. Their use is closely related to the use of IEC 61850-9-2 for data transfer of measured values within the substation for the purpose of protection and measurement. The use of sensors and communication standard IEC 61850 together with high-speed Ethernet will simplify the concept of the arrangement of protection terminals in substations and enable the development of a new protection system based on central protection. The dissertation is focused on protec

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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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5

Strapko, Miroslav. "Návrh systému chránění s použitím elektronických přístrojových transformátorů (senzorů) v rozvodně vysokého napětí." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219395.

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Master's thesis deals with use of electronic instrument transformers (sensors) in the protection system in medium-voltage substation. Substation consists of 2 incoming feeders, 2 outgoing feeders for motors, 2 outgoing feeders for power transformers, measuring, bus coupler and bus riser feeder. Incoming feeders are connected to distribution system E.ON by cable lines which were proposed. Protected machines (power transformers and motors with rated power) are connected to switchgear panels of UniGear ZS1 type by cable lines too. Proposed protection system is based on the short-circuit condition

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6

Bulgarelli, Roberval. "Proteção térmica de motores de indução trifásicos industriais." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-01122006-134918/.

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Em função das limitações apresentadas pelos relés eletromecânicos, a proteção térmica de motores foi historicamente tratada como um problema de coordenação de sobrecorrente, sem levar em consideração a dinâmica e o histórico térmico envolvido na operação contínua do motor. Os atuais relés microprocessados para proteção de motores implementam equações diferenciais de primeira ordem, cujos algoritmos, processados em tempo real, possibilitam uma nova abordagem para uma adequada proteção térmica, utilizando modelos matemáticos. Especialmente para os motores industriais de grande porte e de maior i

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7

Negrão, Danilo Luiz Alves. "Metodologia para a coordenação e seletividade da proteção direcional de sobrecorrente em sistemas de transmissão de energia elétrica." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-05082015-105138/.

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Este trabalho propõe uma nova metodologia para a solução do problema de coordenação de relés direcionais de sobrecorrente em sistemas de transmissão em malha. São utilizadas informações sobre a atuação do relé como dispositivo de proteção principal (ou retaguarda local no caso de se considerar o relé de distância) e também de sua atuação como proteção de retaguarda remota, fornecendo uma base mais sólida para definição dos ajustes. A partir de uma série de critérios determinados de acordo com a instalação, define-se uma área de ajuste do relé, diretamente sobre sua curva de atuação. Sobre esta

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8

Santos, Fábio Marcelino de Paula. "Algoritmo enxame de partículas evolutivo para o problema de coordenação de relés de sobrecorrente direcionais em sistemas elétricos de potência." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-26082013-103833/.

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Um sistema elétrico de potência agrega toda a estrutura pela qual a energia elétrica percorre, desde a sua geração até o seu consumo final. Nas últimas décadas observou-se um significativo aumento da demanda e, consequentemente, um aumento das interligações entre sistemas, tornando assim a operação e o controle destes extremamente complexos. Com o fim de obter a desejada operação destes sistemas, inúmeros estudos na área de Proteção de Sistemas Elétricos são realizados, pois é sabido que a interrupção desses serviços causam transtornos que podem assumir proporções desastrosas. Em sistemas elét

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9

NASCIMENTO, Jamile Pinheiro. "Um algoritmo de proteção adaptativa para sistemas de distribuição com inserção de geração distribuída." Universidade Federal de Campina Grande, 2014. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/444.

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Submitted by Johnny Rodrigues (johnnyrodrigues@ufcg.edu.br) on 2018-04-20T22:58:46Z No. of bitstreams: 1 JAMILE PINHEIRO NASCIMENTO - DISSERTAÇÃO PPGEE 2014..pdf: 2146495 bytes, checksum: e397e112357d55c0badad1a62f5324cf (MD5)<br>Made available in DSpace on 2018-04-20T22:58:46Z (GMT). No. of bitstreams: 1 JAMILE PINHEIRO NASCIMENTO - DISSERTAÇÃO PPGEE 2014..pdf: 2146495 bytes, checksum: e397e112357d55c0badad1a62f5324cf (MD5) Previous issue date: 2014-08<br>Um algoritmo de proteção adaptativa para solucionar o problema da proteção de sistemas com geração distribuída é proposto. O algoritmo mo

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10

Corrêa, Rafael. "Otimizacão da coordenação de relés de sobrecorrente direcionais em sistemas elétricos de potência utilizando a programação inteira binária." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/8505.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>This work aims to optimize the coordination of microprocessor-based directional overcurrent relays in power systems using Binary Integer Programming (BIP). Two new mathematical models of BIP are presented. The first determines only the Time Multiplier of each relay, while the second determines simultaneously the Time Multiplier and Current Multiplier of each relay. These models have a great advantage over the Linear Programming (LP) and Nonlinear Programming (NLP) models to determine the relay settings directly within the range pro

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11

Moro, Vinícius de Cillo. "Metodologia para coordenação otimizada entre relés de distância e direcionais de sobrecorrente em sistemas de transmissão de energia elétrica." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-30102014-093627/.

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A proteção de sistemas de energia elétrica possui papel extremamente importante no aspecto de garantir o fornecimento de energia de maneira segura e confiável. Assim, a ação indevida ou a não atuação deste sistema de proteção pode causar danos materiais ou econômicos tanto para as concessionárias quanto para os consumidores de energia elétrica. Dessa forma, o sistema de proteção deve estar bem ajustado para que possa garantir suas funções, sendo sensível, seletivo, confiável e rápido. Para tanto, uma boa coordenação entre os relés de proteção deve ser estabelecida. No caso de um sistema de tra

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12

Bottura, Fernando Bambozzi. "Algoritmo de otimização híbrido para a coordenação de relés direcionais de sobrecorrente em um sistema elétrico malhado." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-07032014-143038/.

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Esta pesquisa tem como objetivo apresentar um método para a coordenação dos Relés Direcionais de Sobrecorrente (RDS) associados ao sistema de proteção de um Sistema Elétrico de Potência (SEP) malhado. O SEP malhado, referente a uma parte do sistema de subtransmissão da rede básica brasileira, em concessão da Companhia de Transmissão de Energia Elétrica Paulista (CTEEP), foi simulado via o software CAPE (Computer-Aided Protection Engineering) a partir da base de dados, para estudos de curtos-circuitos, disponibilizada pelo Operador Nacional do Sistema (ONS). Dada a topologia e a operação do SEP

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13

Wannous, Kinan Hasan Wafaa. "Distanční ochrana využívající digitální vstupní data." Doctoral thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2020. http://www.nusl.cz/ntk/nusl-414159.

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Standard IEC 61850-9-2 definuje přenos vzorkovaných měřených hodnot (sampled measured values, SMV) prostřednictvím sítě Ethernet a využití SMV získaných ze slučovacích jednotek nebo přístrojových transformátorů. Implementace IEC 61850-9-2 závisí na vlastnostech datového souboru, jakými jsou časová synchronizace, počet vzorků a časový interval. Dizertační práce je zaměřena na algoritmy chránění a analýzu vlivu standardu IEC61850-9-2LE na fyzická zařízení ochran s analogově/digitálními vstupními daty o proudu a napětí. S ohledem na narůstající míru interakce mezi fyzickými zařízeními a komunikač

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14

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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15

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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16

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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17

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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18

Soares, Antonio Helson Mineiro. "Metodologia computacional para coordenação automática de dispositivos de proteção contra sobrecorrente em sistemas elétricos industriais." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-17112009-090033/.

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Este trabalho apresenta uma metodologia computacional para coordenação automática de dispositivos de proteção contra sobrecorrente em sistemas elétricos industriais radiais, tendo como principais vantagens a exatidão nos cálculos dos ajustes e a proposição automática de soluções para eventuais problemas de coordenação, sempre que possível. A metodologia é utilizada tanto para proteção individual contra sobrecorrente dos equipamentos quanto para coordenação dos dispositivos de proteção do sistema. É feito um estudo detalhado dos requisitos de proteção de sobrecorrente dos equipamentos empregado

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SOUZA, JÚNIOR Francisco das Chagas. "Algoritmo auto-adaptativo para proteção de sobrecorrente instantânea." Universidade Federal de Campina Grande, 2016. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/1417.

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Submitted by Emanuel Varela Cardoso (emanuel.varela@ufcg.edu.br) on 2018-08-13T16:41:07Z No. of bitstreams: 1 FRANCISCO DAS CHAGAS SOUZA JÚNIOR – TESE (PPGEEI) 2016.pdf: 4537364 bytes, checksum: 1696c9bd2456c0caad5ee6e61bcb7ca4 (MD5)<br>Made available in DSpace on 2018-08-13T16:41:07Z (GMT). No. of bitstreams: 1 FRANCISCO DAS CHAGAS SOUZA JÚNIOR – TESE (PPGEEI) 2016.pdf: 4537364 bytes, checksum: 1696c9bd2456c0caad5ee6e61bcb7ca4 (MD5) Previous issue date: 2016-07-05<br>Uma técnica auto-adaptativa que torna a obtenção dos ajustes de coordenação de relés de sobre corrente instantânea para siste

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Cesar, Eduardo Lenz. "Sistemas inteligentes aplicados à coordenação da proteção de sistemas elétricos industriais com relés digitais." Universidade do Estado do Rio de Janeiro, 2013. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8023.

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Atualmente existem diferentes ferramentas computacionais para auxílio nos estudos de coordenação da proteção, que permitem traçar as curvas dos relés, de acordo com os parâmetros escolhidos pelos projetistas. Entretanto, o processo de escolha das curvas consideradas aceitáveis, com um elevado número de possibilidades e variáveis envolvidas, além de complexo, requer simplificações e iterações do tipo tentativa e erro. Neste processo, são fatores fundamentais tanto a experiência e o conhecimento do especialista, quanto um árduo trabalho, sendo que a coordenação da proteção é qualificada pela IEE

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Bernardes, Wellington Maycon Santos. "Algoritmo enxame de partículas discreto para coordenação de relés direcionais de sobrecorrente em sistemas elétricos de potência." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-14052013-094113/.

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Este trabalho propõe uma metodologia baseada em técnicas inteligentes capaz de fornecer uma coordenação otimizada de relés direcionais de sobrecorrente instalados em sistemas de energia elétrica. O problema é modelado como um caso de programação não linear inteira mista, em que os relés permitem ajustes discretizados de múltiplos de tempo e/ou múltiplos de corrente. A solução do problema de otimização correspondente é obtida através de uma metaheurística nomeada como Discrete Particle Swarm Optimization. Na literatura técnico-científica esse problema geralmente é linearizado e aplicam-se arred

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蔡秉桓. "Design of Smart Overcurrent Protection Relay." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/v2xnp5.

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碩士<br>國立彰化師範大學<br>工業教育與技術學系<br>106<br>In this study, an overcurrent protection relay controlled by a microprocessor is proposed. When an overcurrent is detected, a Silicon Controlled Rectifier (SCR) is triggered synchronously so that the anode and the cathode do not conduct. Switch off. Under normal power supply, both ends of the SCR will remain on. When an over-current fault occurs, the gate current of the SCR is cut off, and the SCR turns off when the polarity of the voltage across the two ends is switched off, enabling the switch speed to reach 8m seconds. It is faster than the fuseless swi

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Lee, Cheng-Hung, and 李振弘. "Optimal Coordination of the Overcurrent Relay Protection of Power Systems." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/yvzrjk.

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博士<br>國立臺北科技大學<br>電機工程系博士班<br>101<br>The dissertation is to research the optimal coordination of the overcurrent relay (OCR) protection of power systems for adaptive protections. OCR has long been the main device protecting power systems. These devices were originally based on electromechanical induction, and new device types were then developed based on solid-state, microprocessors and intelligent electronic devices (IED), with the protective features evolving from single phase units to multi-phase multi-functional units with communications and network SCADA control. Overcurrent relay with a

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Lwin, Min Naing. "Time-domain modeling and validation of overcurrent/reclosing relay operation." 2013. http://hdl.handle.net/2152/21754.

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The primary goal of this work is to develop a PSCAD/EMTDC simulation model which can emulate the reclosing capabilities of an actual reclosing relay. The first part of this work will demonstrate the capabilities of a commercially available, microprocessor-based reclosing relay, the SEL-551c. Next, a computer simulation model of this relay's reclosing capability will be developed in PSCAD/EMTDC and validated. The performance of the model will be compared to the performance of the SEL-551c. Because it is impractical to test the relay operation under fault conditions in a real distribution system

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Boodhraj, Revana. "Evaluation of overcurrent protection performance and application on the Eskom shunt capacitors during system disturbances." Thesis, 2009. http://hdl.handle.net/10413/3759.

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This dissertation report began as an investigation into an overcurrent relay protection operation on a shunt capacitor bank (SCB) at ESKOM’s Westgate substation. Westgate substation has two SCBs, both of which were in service at the time of the 2007 incident. However, only the overcurrent protection scheme applied on SCB No.2 operated due to an external feeder fault on the Eltro feeder at Westgate substation. In 2004, SCB No.2 had tripped also on an overcurrent relay protection operation for an external fault. The difference identified in the otherwise identical SCBs was the relay technology e

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Liang, Chen-yu, and 梁辰宇. "Development of a DSP-based Directional Overcurrent Relay for Feeder Protection in Microgrid." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/42044114599495432577.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>102<br>Traditionally, the distribution system is radial type. The fault current presents in top-dowm direction; hence, a non-direction overcurrent relay may apply for feeder protection. Nowaday, Distributed Generations (DG) have been widely installed and fed into the distribution system. The system with DG may form as Microgrid and operate in Grid-Connected Mode or Islanded Mode. However, the fault current in Microgrid no longer presents in one-way. The directional function relay must be introduced instead of non-directional one. It will increase the installation cos

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Lee, Chen-Wun, and 李振文. "Protective Coordination of Overcurrent Relays for Distribution Feeder." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/16481829837399413337.

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碩士<br>國立臺灣海洋大學<br>電機工程學系<br>103<br>Currently the protective relays for feeders from secondary substations of the utility include both types of electromagnetic relay and intelligent digital relay. It is common practice to use the per-unit method to calculate the currents of both three-phase and single-phase-to-ground faults, and the ANSI / IEEE or IEC over-current formula to plot the protective coordination curves. Then based on the coordination spacing and margin consider the feeder line, the branch line switch, the duty point, and the feeder breaker, the Protective Coordination Analysis Progr

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Lu, Ying, and 陸茵. "Developing a GUI Relay Setting Program to Improve the Protective Coordination Settings of Overcurrent Relays in Subtransmission Networks." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/g2u9q4.

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博士<br>國立臺北科技大學<br>機電科技研究所<br>98<br>By employing the systematic analysis and design procedures, a GUI overcurrent relay setting program implementing the inspecting and eliminating curve intersection technique as well as the operating time reduction technique is developed to replace the traditional tedious and time-consuming trial-and-error manual process such that the protection engineers can use it to easily and effectively tackle the protective coordination problems encountered practically in subtransmission networks, such as curve intersection, and long operating time in coordination. In add

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Chung, Jarm-Long, and 鍾彰榮. "Exploring the Protective Coordination Problems of Overcurrent Relays and Distance Relays in Transmission Networks." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/xjce89.

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博士<br>國立臺北科技大學<br>電機工程系所<br>98<br>The protective coordination provided by protective relays in the transmission systems is important for power safety and quality. Overcurrent relays are mainly used in protecting the subtransmission and distribution systems. In practice, the coordination curve intersection of a downstream and upstream relay pair will cause unexpected augmentation of the blackout area as a fault occurs in the downstream relay side. In addition, in a single ring or a complex low voltage power transmission network with many buses cascaded, expensive power equipments would be damag

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KAI, SHYU SHIEN, and 徐鉉凱. "Digital Directional Overcurrent Relays Applied in the Optimal Protection of Transmission Lines of Coordination Strategy." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/38795957617947751199.

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碩士<br>國立臺灣科技大學<br>電機工程系<br>100<br>Directional overcurrent relays are widely used in power complex loop network. Coordination process, consider the network system change and to meet the variety of coordination norms and restrictions, the relay engineers often spend a lot of time to calculate the power relay standard configuration settings. This thesis focuses on the directional over current relay to the optimal settings a comprehensive set of methods to solve the optimal settings in different networks. The graph theory algorithms based on the high-capacity power supply are proposed, to decided

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Ituzaro, Fred Agyekum. "A Technique to Utilize Smart Meter Load Information for Adapting Overcurrent Protection for Radial Distribution Systems with Distributed Generations." Thesis, 2012. http://hdl.handle.net/1969.1/ETD-TAMU-2012-05-10791.

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Smart radial distribution grids will include advanced metering infrastructure (AMI) and significant distributed generators (DGs) connected close to loads. DGs in these radial distribution systems (RDS) introduce bidirectional power flows (BPFs) and contribute to fault current. These BPFs may cause unwanted tripping of existing overcurrent (OC) protection devices and result in permanent outages for a large number of customers. This thesis presents a protection approach that modified an existing overcurrent protection scheme to reduce the number of customers affected by faults in RDS with DGs. F

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