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Dissertations / Theses on the topic 'Current differential protection'

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Published: 2 June 2025
Last updated: 31 July 2025

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1

Kangvansaichol, K. "Multi-zone current differential protection for transmission networks." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419469.

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2

Hossain, Monir. "Performance Optimization of the Differential Protection Schemes." ScholarWorks@UNO, 2018. https://scholarworks.uno.edu/td/2566.

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Current differential protection principle is superior in terms of sensitivity and speed of operation in comparison with other protection principle used in power systems. From the last five decades, various current differential protection schemes are widely used to protect busbars, transformers, and short-transmission lines. The deployment of high capacity microwave and optical fiber technologies redefined the line protection systems by facilitating the use of current differential protection schemes for long transmission lines. The common application issue of these schemes is mis-operation due
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3

Wheatley, John Malcolm. "A current differential feeder protection for use with leased voice frequency communications circuits." Thesis, Northumbria University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245264.

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4

Hossain, Monir. "Fault Discrimination Algorithm for Busbar Differential Protection Relaying Using Partial Operating Current Characteristics." ScholarWorks@UNO, 2016. http://scholarworks.uno.edu/td/2263.

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Differential protection is the unit protection system which is applied to protect a particular unit of power systems. Unit is known as zone in protection terminology which is equivalent to simple electrical node. In recent time, low impedance current differential protection schemes based on percentage restrained characteristics are widely used in power systems to protect busbar systems. The main application issue of these schemes is mis-operation due to current transformer (CT) saturation during close-in external faults. Researchers have suggested various solution of this problem; however, ind
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5

Husseini, A. H. "Design and testing of a new microprocessor-based current differential protection scheme for teed circuits." Thesis, University of Bath, 1991. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760616.

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6

Habib, MD Zakaria. "The Impacts of UHV AC Transmission Lines on Traditional Line Differential Protection Functions." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-228389.

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UHV transmission lines have several advantages when it comes to transferring of bulk amount ofpower in long distances. Although the technology is available from 1980’s, the number of UHVtransmission lines around the world has been increased in the beginning of this century in orderto supply the high demand of electricity. The number is going to increase even more in the nextfew years. Thus, it is important to study the UHV line characteristics and update the powersystem equipment as well as the operation procedure accordingly.UHV transmission lines exhibits some distinct phenomena which are no
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7

Chiwaya, A. A. W. "Polarised polyphase current differential protection for distribution feeder circuits using a digital voice frequency communications channel." Thesis, University of Bath, 1994. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.760664.

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8

Jorge, David Calhau. "Transformadas wavelet aplicadas à proteção diferencial de transformadores de potência." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-18022016-093145/.

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Transformadores de potência são dispositivos que requerem atenção especial devido a sua grande importância ao sistema elétrico de potência no qual ele está conectado. Geralmente relés diferenciais são utilizados como proteção primária em transformadores de potência. Nestes relés, a corrente diferencial é comparada com um nível de ajuste e caso ocorra uma falta interna, o transformador deverá ser desconectado do restante do sistema. Entretanto, a simples detecção da presença de uma corrente diferencial não é suficiente para distinguir faltas internas de outras situações que também podem produzi
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9

Bernardes, Alexandre Paciencia. "Um esquema completo de proteção diferencial de transformadores para testes em um relé digital." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-16072006-122259/.

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Este trabalho apresenta um procedimento completo de simulação da proteção digital diferencial aplicada a transformadores de potência, visando o emprego deste à avaliação do comportamento de relés comercialmente disponíveis. Foi escolhido o software ATP (Alternative Transients Program) como ferramenta para a simulação de distintas situações sobre um sistema diferencial de proteção aplicado a um transformador de 25 MVA. Dentre as ocorrências evidenciadas, destacam-se: situações de faltas internas, faltas externas, situações de energização e energização com falta interna do transformador, condiçã
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10

Silva, Rogério Cesar Serapião. "Projeto diferencial de geradores síncronos: o uso de redes neurais artificiais para identificação e correção da saturação dos transformadores de corrente." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/18/18154/tde-16042012-155039/.

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Este trabalho tem como objetivo apresentar um algoritmo de proteção diferencial de geradores baseado em Redes Neurais Artificiais (RNAs), que seja robusto e confiável em situações onde os algoritmos padrões podem apresentar dificuldades, como no caso, da saturação de TCs. O algoritmo desenvolvido é constituído por dois módulos principais: a) um módulo de detecção da saturação dos transformadores de corrente (TCs) empregados na proteção diferencial de geradores e; b) um módulo de correção das formas de onda distorcidas devido à saturação dos TCs. Os módulos utilizam RNAs para detectar e corrigi
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11

Segatto, Ênio Carlos. "Relé diferencial para transformadores de potência utilizando ferramentas inteligentes." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/18/18133/tde-19022016-144637/.

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Este trabalho apresenta a proposta de um sistema completo de proteção diferencial de transformadores de potência, aplicando-se as técnicas de Redes Neurais Artificiais (RNAs). O esquema proposto busca a classificação do sistema de proteção como um problema de reconhecimento e reconstrução de padrões, representando um método alternativo aos algoritmos convencionais. Vários fatores como, por exemplo, as situações de energização do transformador e a saturação dos transformadores de corrente, podem causar uma má operação do dispositivo de proteção. Com o objetivo de melhoramento na proteção digita
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12

Ніценко, Володимир Вікторович. "Підвищення показників ефективності функціонування релейного захисту збірних шин розподільчих установок". Thesis, Запорізький національний технічний університет, 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/34557.

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Дисертація на здобуття наукового ступеня кандидата технічних наук (доктора філософії) зі спеціальності 05.14.02 – Електричні станції, мережі і системи. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2018. Дисертація присвячена розв'язанню актуальної науково-прикладної задачі у галузі релейного захисту елементів електроенергетичних систем, що полягає у підвищенні ефективності дії релейного захисту збірних шин розподільчих установок. У роботі вдосконалено метод диференційно-фазного захисту шин, згідно з яким алгоритм порівняння фаз струмів застосовано у якос
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13

Ніценко, Володимир Вікторович. "Підвищення показників ефективності функціонування релейного захисту збірних шин розподільчих установок". Thesis, НТУ "ХПІ", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/34554.

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Дисертація на здобуття наукового ступеня кандидата технічних наук (доктора філософії) зі спеціальності 05.14.02 – Електричні станції, мережі і системи. – Національний технічний університет "Харківський політехнічний інститут", Харків, 2018. Дисертація присвячена розв'язанню актуальної науково-прикладної задачі у галузі релейного захисту елементів електроенергетичних систем, що полягає у підвищенні ефективності дії релейного захисту збірних шин розподільчих установок. У роботі вдосконалено метод диференційно-фазного захисту шин, згідно з яким алгоритм порівняння фаз струмів застосовано у якост
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14

Hrycík, Tomáš. "Porovnání použití přístrojových transformátorů a senzorů v aplikacích s ochranou REF 542plus." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218429.

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The aim of this Master´s thesis is use of instrument transformers and sensors on field of industry protection. We will compare current and voltage transformers, current sensor – based on Rogowski coil, voltage sensor – based on voltage divider. By this measure devices, we can monitoring values of analog quantities in medium voltage switchgear. It is impossible to compare, measure and analyze without this measure devices. There is protection terminal REF542plus, which can compile this values. The REF542plus ability are measuring, monitoring, remote control and protection. First, we will discuss
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15

Marques, Jeferson Prates. "Proteção de transformadores de potência eclassificação de transitórios elétricos por meio da transformada wavelet discreta." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/8549.

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This dissertation presents the development of an algorithm for classifying electrical transients in power transformers for protection. Initially the main transient involving power transformers were analyzed, with a special focus on the magnetizing current that occur during energizing equipment, known as inrush currents. Among the studied transient, current inrush are those that present greater difficulty in identification and discrimination by the differential protection, due to its high peak magnitude. In a second moment, was developed a test system implemented in ATP / EMTP software for the
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16

Chen, Chun-wen, and 陳俊文. "Applications of Current Transformer Jiles-Atherton Modeling for Differential Protection Studies." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/82600593705052843120.

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碩士<br>逢甲大學<br>資訊電機工程碩士在職專班<br>94<br>This thesis simulation procedure of use the electromagnetic transient program （EMTP） analyze differential protect in bus structure of model. The direct current （DC） offset component of current will be produced when the fault occurs in power system. This Dc offset of current is flowing into a protective current transformer （CT）, it will cause the core of CT to saturate and produce a distorted secondary current because of too large Dc offset component, and core hysteresis results in a residual flux that also affects the CT transient behavior. It produces the f
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17

Madzikanda, Ezekiel. "Investigation into methods of reducing the blocking time of differential protection during inrush conditions." Thesis, 2008. http://hdl.handle.net/10539/4773.

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ABSTRACT Power transformers are key components for electrical energy transfer in a power system. Stability and security of transformer protection are important to system operation. Many maloperation cases of transformer differential protection are caused by inrush current problems. The phenomenon of transformer inrush current has been widely discussed in literature. Therefore, this research only discussed and analyzed inrush current problems to transformer differential protection. To understand the inrush current problems on differential protection, transformer simulation models were p
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18

Huang, Ching-Lin, and 黃慶林. "Global Positioning System Application in Current Phase Comparison of Differential Protection Relay of Transmission and Distribution Line." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/3wz4vf.

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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>100<br>This dissertation applied synchronous time of global positioning system (GPS) to generate reference voltage for current phase comparison of differential protection relay of power transmission line. The proposed method does not require conventional temporary reference voltage configuration, and can make current phase comparison test faster and safer. This dissertation simulated short circuit current before power transmission system is integrated into system, so that the differential protection relays at both ends have current value, and current transducer tr
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19

Cao, Zhi-Hao, and 曹志豪. "The Influence of Differential Protective due to the Saturation Characteristic of Current Transformers." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/08487578808837127538.

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碩士<br>逢甲大學<br>電機工程學系<br>89<br>The relay of power system often causes miss-action due to the saturation characteristic of current transformers so that it does damage in system equipment and has a tremendous effect on the protection and operation of power system. Therefore, this thesis explores the possible effects on the transient over-current phenomenon caused by the current transformer because it breaks down. To further understand the cause and effect of this phenomenon, this thesis intends to apply the describing function to nonlinear system in order to establish a model of current transform
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