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Dissertations / Theses on the topic 'Modeling of relay protection'

Author: Grafiati

Published: 28 May 2022

Last updated: 30 July 2025

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1

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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2

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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3

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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4

Aminu, Maruf Asumo. "Modeling and Simulation of Protective Relay for Short Circuits in AC Micro-grids using Fuzzy Logic." Thesis, Curtin University, 2016. http://hdl.handle.net/20.500.11937/51625.

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The duo of high human appetite for electricity in the 21st century and high human population growth rate entail inadequacy of contemporary electric power protective systems for the emerging micro-grid. This thesis presents results of a research which seeks to propose a new model of protective device for short circuits in ac micro-grids. Response of the proposed relay is consistent with a reliable device. Consequently, a protective relay for short circuits in micro-grids is proposed.

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5

Nozdrenko, Valerii Stanislavovych, Валерий Станиславович Ноздренков, Валерій Станіславович Ноздренков та Е. А. Шолудько. "Моделирование релейной защиты с помощью среды SPAC 800". Thesis, Изд-во СумДУ, 2008. http://essuir.sumdu.edu.ua/handle/123456789/4125.

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6

Magrin, Fabiano Gustavo Silveira 1978. "Modelagem de um relé de proteção diferencial de transformador no RTDS." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/259599.

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Orientador: Maria Cristina Dias Tavares<br>Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Elétrica e de Computação<br>Made available in DSpace on 2018-08-25T04:21:56Z (GMT). No. of bitstreams: 1 Magrin_FabianoGustavoSilveira_M.pdf: 5471875 bytes, checksum: 204630879d78c9f5167f324d6d0f5fe9 (MD5) Previous issue date: 2014<br>Resumo: Devido à dificuldade de execução de testes em sistemas reais os engenheiros procuram ferramentas e modelos para simular ou emular os sistemas reais em laboratório. Nesse sentido, o objetivo deste projeto de pesquisa foi desenvol

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7

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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8

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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9

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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10

Lima, Jose Augusto. "Relay Attack in RFiD Systems Analysis and Modeling." Thesis, University of Ottawa (Canada), 2011. http://hdl.handle.net/10393/28935.

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A relay attack on an RFiD system is carried out by a team of two attackers: one stationed near the victim, and using a rogue Reader to activate the victim's TAG; and another stationed near the legitimate Reader, using a high-speed communication system to relay the communication between the victim's TAG to the legitimate Reader through the attackers in real time. The relay attack is one of the most significant threats to the security of RFiD systems, because it is difficult to detect, is not thwarted by standard challenge-and-response security protocols and is independent of any cryptographic a

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11

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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12

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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13

Vilayannur, Natarajan Shankar. "Modeling the pneumatic relay valve of an s-cam air brake." Thesis, Texas A&M University, 2005. http://hdl.handle.net/1969.1/2363.

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Statistics indicate that defects in brake system contribute significantly to fatal crashes involving commercial vehicles. Hence there is a need for developing preventive and active safety measures for assessing the performance of an air brake system in trucks. Existing techniques for assessing the performance of brakes are infrastructure intensive, time and labor intensive. The premise of this thesis is that model-based diagnostic techniques can be employed to overcome these limitations of existing tech- niques. The design of a model-based diagnostic system requires the development and experim

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14

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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15

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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16

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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17

Dube, Tendai Raymond. "Investigating the capabilities of SEL787 transformer protection relay using low level simulators." Thesis, Dube, Tendai Raymond (2016) Investigating the capabilities of SEL787 transformer protection relay using low level simulators. Honours thesis, Murdoch University, 2016. https://researchrepository.murdoch.edu.au/id/eprint/30802/.

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Protection relays play an integral part in electrical power systems. They monitor and detect abnormal system conditions and initiate the operation of protective devices like circuit breakers to take corrective action and restore the power system to its normal state. Over the years, the technology has evolved from the old electromechanical-based relays to the new microprocessor-based relays also known as intelligent electronic devices, such as the SEL 787 transformer protection relay. Correct operation of these devices is critical as malfunction or incorrect operation might lead to severe damag

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18

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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19

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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20

Nilsson, Markus, and Robert Olsson. "Framtagning av reläskyddsinställningar för en transformatorstation." Thesis, Karlstads universitet, Fakulteten för teknik- och naturvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-14623.

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A substation must be properly protected against lightning and other external effects to the equipment in the station or staff, for that we use relay protection. They should also protect against internal errors which may occur as ground faults. There are different types of protection relays, but most common are overcurrent-, distance-, residual current- and differential protection. The purpose of this thesis was to deepen our knowledge of relay protection and to use the theoretical knowledge we got from the university studies in the work process. In the process we discovered which parameters we

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21

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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22

Bashour, Rami. "High voltage optical fibre sensor for use in wire relay electrical protection systems." Thesis, University of Derby, 2016. http://hdl.handle.net/10545/621343.

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The last few decades have a wide spread use of optical fibre sensors in many applications. Optical fibre sensors have significant benefits over existing conventional sensors such as; high immunity to electromagnetic interference, the ability to transmit signal over long distance at high bandwidth, high resolution, usage in hazardous environments and no need for isolation when working at high voltages. The measurement of high voltages is essential for electrical power systems as it is used as a source of electrical information for Relay Protection Systems (RPS) and load management systems. Elec

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23

Hoxha, Neriton. "Ultra-fast line protection relay algorithm based on a Gamma model of line." Doctoral thesis, Universite Libre de Bruxelles, 2020. https://dipot.ulb.ac.be/dspace/bitstream/2013/313348/6/contratNH.pdf.

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The relay protections of the transmission lines play a fundamental role in the electrical power systems. They permit to ensure the security and the reliability of the electricity transmission from the generators to the final consumers. The objective of a relay protection is to provide a corrective action as quickly as possible when an abnormal condition of the power system is detected. The quickness of the response permits to limit the stress on the equipments of the power system and the consumers, to ensure the security of the people, to improve the power quality and to maintain the stability

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24

Riemer, Douglas P. "Modeling cathodic protection for pipeline networks." [Gainesville, Fla.] : University of Florida, 2000. http://etd.fcla.edu/etd/uf/2000/ane5967/Dissertation.pdf.

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Thesis (Ph. D.)--University of Florida, 2000.<br>Title from first page of PDF file. Document formatted into pages; contains xxii, 263 p.; also contains graphics. Abbreviated abstract copied from student-submitted information. Vita. Includes bibliographical references (p. 252-262).

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25

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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26

Ghafari, Christophe. "Innovative numerical protection relay design on the basis of sampled measured values for smartgrids." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT113/document.

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Avec le paradigme du réseau intelligent, les ingénieurs de protection ont maintenant à leur disposition une large gamme de nouvelles technologies de communication. Parmi elles, la norme CEI 61850-9-2 a introduit le concept de bus de procédé qui permet l'envoi de valeurs échantillonnées horodatées à un temps absolu depuis les transformateurs de mesure du terrain jusqu’aux relais de protection numériques. Ces derniers peuvent intégrer la fonction d'unité de mesure de phaseur qui peut être utilisé pour échanger des synchrophaseurs entre les fonctions de protection et pour une nouvelle protection

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27

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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28

Minkley, Warick. "Analysis of restricted earth fault relay application within a shunt capacitor bank design impacting on protection stability." Thesis, Nelson Mandela Metropolitan University, 2013. http://hdl.handle.net/10948/d1021106.

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This research is aimed at analyzing the performance of the restricted earth fault relay used on a 400kV capacitor bank scheme used on the Eskom Transmission network. After the commissioning of two Capacitor Banks using the above mentioned scheme design the plant was energized. As a result of the energization the Shunt Capacitor Bank (SCB) then experienced spurious trips. The cause of the trips was found to be the operation of the restricted earth fault relay. In this research project, restricted earth fault protection on SCBs in the Eskom Transmission environment will be the area of interest.

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Troskie, Hercules Johannes. "Research into specific numerical protection maloperations / Hercules Johannes Troskie." Thesis, North-West University, 2012. http://hdl.handle.net/10394/8454.

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High voltage transmission system availability and system security are key performance criteria for electricity utilities worldwide. System disturbances need to be cleared quickly and accurately in order to minimise the impact of faults and to facilitate speedy system restoration. In this context, the South African utility, Eskom has maintained a process of refreshing protective relaying technology as older equipment becomes obsolete and is no longer capable of meeting the utility’s requirements. The difficulties which a process of equipment renewal presents the organisation with include the ri

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30

Song, Guowen. "Modeling Thermal Protection Outfits for Fire Exposures." NCSU, 2002. http://www.lib.ncsu.edu/theses/available/etd-10012002-131129/.

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A numerical model has been developed that successfully predicts heat transfer through thermally protective clothing materials and garments exposed to intense heat. The model considers the effect of fire exposure to the thermophysical properties of materials as well as the air layers between the clothing material and skin surface. These experiments involved characterizing the flash fire surrounding the manikin by measuring the temperature of the flame above each thermal sensor in the manikin surface. An estimation method is used to calculate the heat transfer coefficient for each thermal sensor

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31

Li, Zhixia. "Dynamic Dilemma Zone Modeling and Its Protection." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1304021604.

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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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33

Lu, Wei. "New Results on Stochastic Geometry Modeling of Cellular Networks : Modeling, Analysis and Experimental Validation." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS253/document.

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L'hétérogénéité et l’irrégularité croissante des déploiements des réseaux sans fil de nouvelles générations soulèvent des défis importants dans l’évaluation de performances de ces réseaux. Les modèles classiques s’appuyant sur des modèles hexagonaux pour décrire les emplacements géographiques des nœuds de transmission sont difficilement adaptables à ces réseaux. Dans ce contexte, il a été proposé un nouveau paradigme de modélisation des réseaux sans fil qui s’appuie sur les processus ponctuels de Poisson (PPP), et de manière générale sur la géométrie stochastique. L'analyse, au travers de ces

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34

Ковальов, С. І. "Підвищення ефективності релейного захисту району електричних мереж 10 кВ м. Хмельницький". Thesis, Чернігів, 2021. http://ir.stu.cn.ua/123456789/25277.

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Ковальов, С. І. Підвищення ефективності релейного захисту району електричних мереж 10 кВ м. Хмельницький : випускна кваліфікаційна робота : 141 "Електроенеретика, електротехніка та електромеханіка" / С. І. Ковальов ; керівник роботи А. І. Сатюков ; НУ "Чернігівська політехніка", кафедра електричної інженерії та інформаційно-вимірювальних технологій. – Чернігів, 2021. – 73 с.<br>Об'єкт - релейний захист електричних мереж 10 кВ досліджуваного району. Ціль – аналіз ефективності релейного захисту ЛЕП 10 кВ досліджуваного району. Проаналізовано ефективність роботи релейного захисту ЛЕП 10 кВ району

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Грудина, А. В. "Реконструкція електричної частини підстанції 110/6 кВ". Master's thesis, Сумський державний університет, 2019. http://essuir.sumdu.edu.ua/handle/123456789/76188.

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Проаналізовано режим роботи підстанції і доведена необхідність модернізації основного обладнання. Розраховано та вибрано устаткування електричної частини підстанції. Проведено перевірку грозозахисту і заземлення, а також, розраховано релейних захист підстанції. Проаналізовано та досліджено переваги та недоліки в роботі обмежувачів перенапруг. Проведено техніко-економічне обґрунтування заміни обладнання. Особливу увагу при виконанні магістерської роботи було приділено питанням охорони здоров'я та безпеки праці персоналу підстанції під час виконання робіт.

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Huang, Ruth Christiana. "Designing Anti-Islanding Detection Using the Synchrophasor Vector Processor." DigitalCommons@CalPoly, 2013. https://digitalcommons.calpoly.edu/theses/1001.

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ABSTRACT Designing Anti-Islanding Detection Using the Synchrophasor Vector Processor Ruth Huang The need for distributed generation (DG) has become more and more popular because of the adverse effects of fossil fuels and the fear of running out of fossil fuels. By having DG, there are less transmission losses, voltage support, controllability of the system, decreased costs in transmission and distribution, power quality improvement, energy efficiency, and reduced reserve margin. The adverse effects of DG are voltage flicker, harmonics, and islanding. Islanding occurs when the DG continues to e

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Salomonsson, Daniel. "Modeling, Control and Protection of Low-Voltage DC Microgrids." Doctoral thesis, Stockholm : Elektriska energisystem, Electric Power Systems, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4666.

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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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Nick, Shawn. "An investigation approach to test protection intelligent electronic devices (IEDs) in IEC 61850 based substation automation systems (SAS) at station level." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/74751/1/Shawn_Nick_Thesis.pdf.

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This thesis has developed a new approach to trace virtual protection signals in Electrical substation networks. The main goal of the research was to analyse the contents of the virtual signals transferred, using third party software. In doing so, a comprehensive test was done on a distance protection relay, using non-conventional test equipment.

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Karlsson, Sanne, and Alexander Maurer. "Förstudie för kontrollanläggningsutrustningi mindre vattenkraftstationer för Uddevalla Energi Elnät AB." Thesis, Högskolan Väst, Avdelningen för data-, elektro- och lantmäteriteknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-7785.

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Uddevalla Energi AB äger fem vattenkraftstationer uppförda från 1920 och framåt. De är lokaliserade i Bäveån i Uddevalla kommun. Den totala installerade effekten i vattenkraftstationerna uppgår till omkring 2 MW. Vattenkraftstationen K4 Fossumsberg,vars installerade effekt uppgår till 1 MW, är den största utav anläggningarna ur denna aspekt. Utöver energiproduktion ska anläggningarna även svara för reglering av vattenståndet i Öresjö och i Bäveån. På uppdrag av Uddevalla Energi Elnät AB utförs detta examensarbete för att fastställa vilken utrustning som rekommenderas till kontrollanläggningarn

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Saied, Usama M. Tsanis Ioannis K. "Integrated coastal engineering modeling /." *McMaster only, 2004.

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Pan, Zhihao [Verfasser]. "Modeling and optimization of discrete ESD protection devices / Zhihao Pan." München : Verlag Dr. Hut, 2015. http://d-nb.info/1074063724/34.

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Ignatova, O. I., and S. A. Ivanov. "Modeling of distance power protection in software complex PSCAD/EMTDC." Thesis, Sumy State University, 2016. http://essuir.sumdu.edu.ua/handle/123456789/46898.

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Modelling of protective relays offer an economical and feasible alternative to investigate the performance of relays and protection systems. To study the performance of the relay characteristics, single line to ground fault at different zones with and without fault resistances are considered. A Fast Fourier Transform block in PSCAD/EMTDC has been used to extract the fundamental component. The test network used in this work is 230kv transmission line systems.

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James, Christian Monje. "Finite Element Modeling and Exploration of Double Hearing Protection Systems." Thesis, Virginia Tech, 2006. http://hdl.handle.net/10919/31310.

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Noise levels in modern industrial and military environments are constantly increasing, requiring the improvement of current hearing protection devices. The improvement of passive hearing protection devices lies in examining the performance of major contributors to reduction of noise attenuation. The finite element method can be used to fully explore single hearing protection (SHP) and double hearing protection (DHP) systems, and the major performance mechanisms can be observed numerically as well as visually in modern postprocessing software. This thesis focuses on developing and evaluating d

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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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Eriksson, Anders. "Modeling and characterization of nonlinear materials for protection of optical sensors /." Linköping : Univ, 2001. http://www.bibl.liu.se/liupubl/disp/disp2001/tek673s.pdf.

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Jenkins, Dylan H. "Modeling forest protection values for the southern Appalachian spruce-fir forest." Thesis, This resource online, 1996. http://scholar.lib.vt.edu/theses/available/etd-09182008-063700/.

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Barik, Tapas Kumar. "Modern Adaptive Protection and Control Techniques for Enhancing Distribution Grid Resiliency." Diss., Virginia Tech, 2021. http://hdl.handle.net/10919/103644.

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Power distribution systems have underwent a lot of significant changes in the last two decades. Wide-scale integration of Distributed Energy Resources (DERs) have made the distribution grid more resilient to abnormal conditions and severe weather induced outages. These DERs enhance the reliability of the system to bounce back from an abnormal situation rather quickly. However, the conventional notion of a radial system with unidirectional power flow does not hold true due to the addition of these DERs. Bidirectional power flow has challenged the conventional protection schemes in place. The mo

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Vavreczky, Gábor. "Otestovaní komunikace po IEC61850 s využitím GOOSE mezi ABB a Siemens ochranou." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2012. http://www.nusl.cz/ntk/nusl-219394.

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The main objective of this thesis is to examine the possibility of cooperation of IEDs from ABB and Siemens in accordance with IEC61850. The aim is to create and test a workflow, after which protection relays from ABB and Siemens will communicate with each other via GOOSE messages. This paper provides a description of the international standard IEC61850, as a theoretical basis. Describes in detail the configuration of protection relays SIPROTEC 7SA610 according to IEC61850. Work provides a description of the configuration tools PCM600 and IET600 which are used for configuration of protection r

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Hardy, Joseph T. 1978. "Injection compression modeling of non-linear positive temperature coefficient circuit protection devices." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/30315.

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Thesis (S.M. and S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.<br>Includes bibliographical references (leaf 72).<br>Polymeric self-resettable circuit protection devices have been manufactured for many years with an extrusion based process. These devices add negligible resistance to a circuit at normal power operating conditions but increases in resistance by several orders of magnitude at a pre-determined level of power in order to protect the circuit from over- current or over-voltage conditions. After the electrical surge stops, and power returns to a n

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