Tesis sobre el tema "Long Cable"
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Scotti, Andrea 1978. "Long term behavior of cable strayed bridges". Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/29408.
Texto completoIncludes bibliographical references (leaf 46).
In the design of a structure, one of the most difficult parameter to assess is how the initial condition of a structure will change with time. During its life span, a structure can be subjected to different loads, changes in geometric configuration and even changes in its mechanical properties. Among all factors that can affect the geometrical reconfiguration of a structure (i.e. settlements and overloads) creep is one of the most important given its inevitability and because of its persistent effects (normally estimated as ten thousand days). Due to the effect of creep, a structure tends to amplify its deformation under a given load condition over time, and the final deformation can even reach values five or six time grater than the initial ones. During the design, the fact that deformations grow with time can be a difficult condition especially for highly indeterminate structures like cable stayed bridges where the stresses are related to the geometric configuration of the structure itself. In concrete cable stayed bridges, in fact, the increase in the deformation of the deck and the pylons over time leads to a decrease in the initial tension in the stays with an obvious difficulty in the design phase of the structure. The first chapter of this thesis illustrates and explains one approximate method used to estimate the effect of creep on a concrete structure. The method proposed in this thesis is the "Age-Adjusted Effective Modulus Method". It was chosen among others because it is one of the most commonly used, and because it is highly accessible.
(cont.) In the second chapter, the Age-Adjusted Effective Modulus Method will be used in conjunction with the force method to study non homogeneous, indeterminate structure under the effect of creep. In this chapter a procedure will be introduced that enables the calculation of an initial value of the prestressing force in the stays that elides the effect of creep on tension. Bridge in Maine, USA (M.Eng Project. Alexander Otenti, Andrea Scotti, Richard Unruh III, 2004). The theory exposed in this thesis is a very powerful procedure that permits to simplification of the problem of creep in cable-stayed bridges, with easy calculations and with an iterative procedure.
by Andrea Scotti.
M.Eng.
Xiang, Yang. "Static and Dynamic Analyses of a Long-Span Cable-Stayed Bridge with Corroded Cables". Thesis, Université d'Ottawa / University of Ottawa, 2018. http://hdl.handle.net/10393/38446.
Texto completoMatsumoto, Tsuyoshi. "Study of Long Span Bridge Design Based on Long Term Maintenance in Developing Countries". Kyoto University, 2020. http://hdl.handle.net/2433/253250.
Texto completoMillers, Kenneth G. "Long term performance of low voltage aerial bundled cable". Thesis, Queensland University of Technology, 1995. https://eprints.qut.edu.au/36235/1/36235_Millers_1995.pdf.
Texto completoShoghijavan, Mohammad [Verfasser]. "Progressive Collapse in Long-Span Cable-Supported Bridges / Mohammad Shoghijavan". Berlin : epubli, 2020. http://d-nb.info/121979502X/34.
Texto completoHodgson, D. A. "The short and long term electric strength of polyethylene insulation". Thesis, University of Southampton, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384272.
Texto completoCheng, Shaohong. "Structural and aerodynamic stability analysis of long-span cable-stayed bridges". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0022/NQ52316.pdf.
Texto completoCheng, Shaohong Carleton University Dissertation Engineering Civil and Environmental. "Structural and aerodynamic stability analysis of long-span cable-stayed bridges". Ottawa, 1999.
Buscar texto completoGrimmelsman, Kirk Alexander Aktan A. E. "Experimental characterization of towers in cable-supported bridges by ambient vibration testing /". Philadelphia, Pa. : Drexel University, 2006. http://hdl.handle.net/1860/1222.
Texto completoGuo, Yi. "Long-term Behavior of the Veteran’s Glass City Skyway Cable Stayed Bridge". University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1302277396.
Texto completoDELL'AMORE, FACH STEFANO. "Un accurato modello analitico per la statica dei ponti strallati di grande luce". Doctoral thesis, Università degli Studi di Roma "Tor Vergata", 2008. http://hdl.handle.net/2108/478.
Texto completoLi, Haoran. "Frequency Domain Analysis of Composite Long-Span Cable-Stayed Bridges by Finite Strip Method". Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36130.
Texto completoSeyedianchoobi, Rasa. "Long Term Health Monitoring of Anthony Wayne Bridge Main Cable with Acoustic Emission Technique". University of Toledo / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1357192802.
Texto completoLee, Jae Kang. "An investigation of bridge health monitoring system based on GNSS for long span cable supported bridges". Thesis, University of Nottingham, 2016. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.716844.
Texto completoLinnet, Agnes. "Eliminating zero-missing phenomenon in long, high voltage, underground cables". Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-253262.
Texto completoHögsta längden på en högspänning underjordisk kabel begränsas ofta av de kriteriersom kabeln inte kan ha mer än 50% reaktiv effektkompensation. Om denna gränsöverskrids kan strömmen i strömbrytaren inte ha noll genomgang efter aktivering,kallad noll saknad fenomen. Detta är problematiskt om ett fel inträffar strax efteraktivering. Under de senaste 10 åren har olika metoder föreslagits, vilket skullemöjliggöra större reaktiv effektkompensation. Dessa metoder hindrar antingen detnollbristande fenomenet (förebyggande metoder) eller ger ett sätt att öppna strömbrytarenom ett fel uppstår (hanteringsmetoder).En ny 200 km, 220 kV linje har föreslagits på Island kallad Sprengisandslína. Ettföreslaget alternativ för att den här linjen ska byggas är att bygga den som en OHLUGC-OHL-linje, eftersom spänningskriterierna inte är uppfyllda om Sprengisandslínaär byggt som en UGC med en 50% reaktiv effektkompensation. Syftet meddenna avhandling är att se huruvida det saknade fenomenet kan undvikas genomatt genomföra motåtgärder - detta ger ett preliminärt resultat om Sprengisandslínakan byggas som en UGC. I denna avhandling analyseras de fyra olika förebyggandemetoderna med en övergående studie för Sprengisandslína: (1) Förinsättningsresistor,(2) Synkroniserad samtidigkoppling, (3) Synkroniserad inkoppling där kabelnaktiveras före shuntreaktorn och (4) ) synkroniserad inkoppling där shuntreaktornaktiveras före kabeln.Preliminära steady state studier utförs för att bestämma det minsta antalet shuntreaktorersom behövs för att uppfylla spänningskriterierna. Resultaten visade att detminsta antalet som behövdes var tre förutsatt att de alla är lika stora som liggerjämnt längs kabeln (en i varje ände och en i mitten). Dessutom är det nödvändigtatt se om generatorer skulle bli underexiterad om kabeln är energiserad med 100%iiiivreaktiva effektkompensation eftersom det kan minska generatorns livslängd. Resultatenvisade att generatorer inte blev underexiterad.Motståndet för synkroniserad omkoppling där shuntreaktorn aktiveras före kabelnoch motmätningen av samtidig synkroniserad omkoppling visades för att elimineradet nollmissande fenomenet när kabeln aktiverades med 100% reaktiv effektkompensation.Synkroniserad omkoppling där shuntreaktorn aktiveras innan kabeln visadesig ha lägre omkopplingsvolymer, 21% högre än nominellt värde och den lägre inbrusningsströmmenpå 2,38 kA. Metoden för samtidig synkroniserad omkopplingär emellertid billigare och omkopplingsvolymen och inströmmen var inom en acceptabelmarginal (omkopplingsvolymer var 35; 9% högre än nominellt värde ochinströmningsströmmen var 4,01 kA).De resultaten av studien indikerar att Sprengisandslína kan energiseras som en UGCmed 100% reaktiv effektkompensation om antingen motspelet av samtidig synkroniseradomkoppling eller synkroniserad omkoppling där shuntreaktorn aktiveras innankabeln installeras. En detaljerad frekvensstudie måste dock utföras innan någon avmotåtgärderna kan rekommenderas.
Ahmed, Samih y Guayente Minchot. "Post-tensioned stress ribbon systems in long-span roofs : Case study: Västerås Travel Center". Thesis, KTH, Betongbyggnad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-230898.
Texto completoKonstruktioner med spännbandsystem bestående av bärande huvudkablar medpålagda plattor, ofta av betong, har många fördelar. Dessa fördelar inkluderarmen begränsas inte till ökad totalt styvhet, kontrollerade nedböjningar och reduceradmaterialförbrukning, vilket minskar lasten och kostnaden. Deras användningär dock vanligen begränsad till broar, särskilt gång- och cykelbroar, där det finnsutrymme för att förankra de höga utdragskrafterna från huvudkablarna. Motsvarandeutrymme finns sällan i byggnader. I det föreliggande arbetet har taket till Västerås Resecentrum valts ut som studieobjekt.Taket kommer att bli ett av väldens längsta kabelburna takkonstruktion.Syftet är att undersöka den optimala tekniken för att modellera ett efterspänt spännbandsystemför taket med hjälp av FE-programmet SAP2000 och att bedöma eventuellaminskningar på utdragskrafter, nedböjningar och betongspänningar. Däreftermodellerades en konventionell kabelburen takkonstruktion med SAP2000, och detjämfördes med det efterspända spännbandsystemet för att undersöka fördelarna avdet sistnämnda. Dessutom har effekten av temperaturlasten och upplagsrörelserundersökts på den slutliga modellen. Slutligen ges några praktiska rekommendationerom byggteknik och en iterativ dimensioneringsprocess som är nödvändig förarkitekturgestaltning och dess krav på geometri. Resultaten visar att det efterspända spännbandsystemet gav lägre betongspänningar,mindre totaltnedböjning, och ännu viktigare, mindre utdragskrafter. Krafterna minskade16%, vilket gav en minskning av konstruktionens horisontella upplagsreaktion.Storleken på reduktionen var direkt proportionell mot spännkraften, så förspänningär en nyckelfaktor vid dimensioneringen.
Tang, Edmond Kai Cheong. "Numerical simulation of a long span bridge response to blast loading". University of Western Australia. School of Civil and Resource Engineering, 2009. http://theses.library.uwa.edu.au/adt-WU2010.0070.
Texto completoMüller, Hubert [Verfasser], Tillmann [Akademischer Betreuer] [Gutachter] Lüders y Rainer [Gutachter] Meckenstock. "Long-distance electron transfer by cable bacteria in aquifer sediments / Hubert Müller ; Gutachter: Rainer Meckenstock, Tillmann Lüders ; Betreuer: Tillmann Lüders". München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1130323196/34.
Texto completoValdebenito, Galo E. "Passive Seismic Protection of Cable-Stayed Bridges Applying Fluid Viscous Dampers under Strong Motion". Doctoral thesis, Universitat Politècnica de Catalunya, 2009. http://hdl.handle.net/10803/6264.
Texto completoPara alcanzar lo antes expuesto, se definieron previamente ocho modelos teóricos de puentes atirantados basados en los internacionalmente conocidos puentes de Walter [Walter, 1999], considerando variaciones del esquema de atirantamiento, nivel del tablero, tipo de tablero y espaciamiento de los cables. Como punto de partida para el análisis dinámico no lineal, se realizó un análisis estático no lineal para todos los casos. Luego, se llevó a cabo una caracterización dinámica de los puentes mediante un análisis modal. Como primera aproximación a la respuesta sísmica de los modelos, se ejecutó un análisis mediante espectros de respuesta para cada caso, con el propósito de comparar el comportamiento sísmico en función de las principales variaciones consideradas, y para seleccionar los dos modelos más representativos para ser analizados usando análisis no lineal paso-a-paso. En seguida, se analizaron las estructuras elegidas en el paso previo mediante uso de análisis temporal no lineal por integración directa, sin la consideración de amortiguamiento viscoso suplementario, y tomando en cuenta sismos de campo lejano y campo cercano. En este sentido, se aplicaron cinco eventos sísmicos artificiales para el análisis de campo lejano, y cinco eventos reales que incorporasen pulsos de velocidad de período largo para el análisis de campo cercano, según el Capítulo 3. Finalmente, el análisis de la ubicación óptima de los amortiguadores, un estudio paramétrico tendiente a seleccionar los parámetros óptimos de los mismos, y el análisis paso-a-paso no lineal considerando los amortiguadores viscosos definitivos, fueron investigados con la idea de comparar las respuestas en función de la naturaleza del evento sísmico y el tipo de atirantamiento de los cables, considerando los mismos eventos sísmicos antes expuestos.
Los resultados de la investigación muestran que la aplicación de amortiguamiento viscoso suplementario es una eficiente estrategia para incrementar el amortiguamiento de una estructura, absorbiendo una gran cantidad de la energía de entrada, y controlando la respuesta de estructuras de período largo, sobre todo en la dirección longitudinal, en donde se manifiestan las mayores respuestas. Más de un 55% de la energía de entrada puede ser disipada usando éstos dispositivos, los cuales resultan ser igualmente efectivos para sismos de campo lejano y campo cercano, con independencia del esquema de atirantamiento empleado, por lo que constituyen una excelente estrategia de protección pasiva. Debido a la gran no linealidad de éstas estructuras, el método del espectro de respuesta debe ser considerado sólo como primera aproximación al problema, y para propósitos comparativos. Para resultados más precisos, y para aplicaciones de diseño, el análisis no lineal paso-a-paso es siempre la mejor opción. Por otro lado, ésta investigación prueba el despreciable efecto del esquema de atirantamiento en la respuesta sísmica, así como el importante aumento de la respuesta cuando son tomados en cuenta los efectos tipo pulso de la directividad de la falla, característicos de sismos de fuente cercana.
Recent seismic events have demonstrated the vulnerability of some bridges under strong ground motions. Cable-stayed bridges are an attractive bridge typology currently used for many practical purposes, constituting important structural systems to be protected against earthquakes. Amongst the current seismic protection strategies, the use of passive devices is the most robust, economic and well-suited option to improve the seismic performance of structures, in which additional energy dissipation systems is good choice. Because of their capacities, easy replacement and maintenance, as well as their interesting mechanical properties, fluid viscous dampers could be an excellent additional energy dissipation system to protect large structural systems against strong earthquakes. For that reason, the analysis, assessment and comparison of the nonlinear seismic response of concrete cable-stayed bridges, with and without the incorporation of nonlinear fluid viscous dampers in order to investigate their effectiveness for seismic protection purposes, is the main objective of this applied research.
To reach the proposed objectives, firstly, eight theoretical cable-stayed bridge models based on the well-known Walter's Bridges [Walter, 1999] were defined; considering variations of the stay cable layout, deck level, deck type and stay spacing. As a starting point of the nonlinear dynamic analysis, a nonlinear static analysis was performed for all the cases. After that, the dynamic characterization of the models was carried out by means of a modal analysis. As a first approach of the seismic response of the bridges, response spectrum analysis was performed in order to compare the seismic behaviour as function of the main variations considered, and to select the two most representative bridges to be analyzed using nonlinear time history analysis. The following stage was the seismic analysis of the selected bridge models from the previous step, applying nonlinear direct integration time history analysis, without additional energy dissipation devices, and considering both far-fault and near-fault ground motions. In these sense, five artificially generated earthquake events were considered for the far-fault analysis, as long as five real earthquake events containing long-period velocity pulses were included for the near-fault analysis, according to Chapter 3. Finally, the analysis of the optimal layout of the dampers, a parametric study to select the optimal damper parameters and the nonlinear step-by-step analysis considering the incorporation of the definitive fluid viscous dampers were investigated in order to compare the seismic responses as a function of the earthquake nature and stay cable layout, taking into account the same earthquake events before mentioned.
Results of this investigation show that application of fluid viscous dampers as additional passive energy dissipation systems is a very efficient strategy to increase the damping of a structure, absorbing a significant amount of the seismic input energy, and controlling the seismic response of long-period structures, mainly in the longitudinal direction, where the main responses occur. More than 55% of the input energy can be dissipated with these devices, being equally efficient for far-fault and near-fault ground motions, independent on the stay cable layout, which constitutes a very promising strategy to protect cable-stayed bridges against earthquakes. Because of the highly nonlinear behaviour of those structures, response spectrum analysis must be considered only as first approach to the seismic response and for comparative purposes. For more accurate analysis results, and for design applications, nonlinear time-history analysis is a necessary choice. Likewise, it is demonstrated that the effect of the stay cable layout on the nonlinear seismic response of the bridges is not very important, as well as an important increase of the seismic response when forward rupture directivity pulse effects are considered, a characteristic of near-source ground motions.
Nariman, Nazim Verfasser], Timon [Akademischer Betreuer] Rabczuk, Magd Abdel [Gutachter] Wahab y Tom [Gutachter] [Lahmer. "Numerical Methods for the Multi-Physical Analysis of Long Span Cable-Stayed Bridges / Nazim Nariman ; Gutachter: Magd Abdel Wahab, Tom Lahmer ; Betreuer: Timon Rabczuk". Weimar : Fakultät Bauingenieurwesen / Institut für Strukturmechanik, 2017. http://d-nb.info/1147686092/34.
Texto completoNariman, Nazim Verfasser], Timon [Akademischer Betreuer] [Rabczuk, Magd Abdel Gutachter] Wahab y Tom [Gutachter] [Lahmer. "Numerical Methods for the Multi-Physical Analysis of Long Span Cable-Stayed Bridges / Nazim Nariman ; Gutachter: Magd Abdel Wahab, Tom Lahmer ; Betreuer: Timon Rabczuk". Weimar : Fakultät Bauingenieurwesen / Institut für Strukturmechanik, 2017. http://nbn-resolving.de/urn:nbn:de:gbv:wim2-20171122-37105.
Texto completoChenoll, Mora Ernesto. "Analysis of metallic coatings based in zinc-aluminium-magnesium alloys, in terms of performance and long-term corrosion. Case study: Electrical cable trays selection in project design". Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/167418.
Texto completo[CA] En els últims anys, s'han desenvolupat nombrosos tipus de recobriments superficials enfront de la corrosió basats especialment en aliatges de zinc-alumini-magnesi (conegudes com a aliatges "ZM"), com a alternatives als recobriments tradicionals basats en zinc (coneguts com a "Z"), amb la finalitat de millorar les seues característiques tècniques i reduir el seu cost. Els fabricants d'aquests nous tractaments reivindiquen una major resistència a la corrosió, basant-se en assajos de corrosió accelerada i assajos de camp, aquests últims de molt pocs anys de duració. La present tesi, té com a principal objectiu l'estructuració i anàlisi de tota la informació existent en l'actual estat de la tècnica, i en particular, l'estudi dels assajos de camp existents per a corroborar la seua resistència a la corrosió en diferents tipus d'ambients i a partir d'això, proposar un model matemàtic que facilite el seu càlcul a llarg termini. Es presenta una revisió de l'estat de la tècnica de recobriments metàl·lics basats en aliatges ZM, que cobreix la seua evolució en el temps, les diferents qualitats i designacions existents en el mercat, la seua estructura i composició, normes internacionals que els regulen i una detallada investigació sobre assajos de camp en localitzacions de tot el món, havent-se trobat assajos d'una duració màxima de 6 anys. A partir de l'anàlisi d'aquests assajos de camp, es proposa una metodologia per a verificar el rendiment i l'evolució de la funció corrosió-temps, en els diferents ambients d'exposició, categoritzats a través de la norma internacional ISO 9223 (ISO, 2012), que els denomina "categories de corrosivitat", i que abasten des de C1 (molt baix) fins a CX (extrem). Aquesta anàlisi ha classificat tots els resultats dels assajos per material, categoria de corrosivitat i evolució al llarg del temps. D'aquesta manera, cada categoria de corrosivitat ha sigut investigada en profunditat, mitjançant una anàlisi estadística, posant especial èmfasi en la corrosió anual, mesura com a pèrdua de massa (µm / any), la funció corrosió-temps i el seu ajust a un determinat comportament. S'han analitzat així mateix els recobriments Z amb la finalitat de poder comparar totes dues alternatives i corroborar la hipòtesi de partida, el supòsit principal de la qual és la major resistència a la corrosió dels aliatges ZM enfront dels recobriments Z. Aquesta anàlisi ha sigut el punt d'entrada, per a establir un model matemàtic que determine el rendiment de la corrosió a llarg termini, amb la finalitat de proporcionar als professionals de projectes en l'enginyeria, una eina que permeta estimar la resistència a la corrosió i l'optimització del cost d'una instal·lació quan s'utilitzen diferents tipus de materials. El compendi de tota aquesta anàlisi s'ha reflectit en l'apartat de Resultats i comentaris. La referida metodologia, s'ha aplicat a un cas d'estudi per a mostrar com seleccionar la qualitat del recobriment i la seua grossària òptima, així com un càlcul de costos, amb l'objectiu de garantir els requisits d'un determinat projecte, en termes de resistència a la corrosió i cost. Les conclusions finals posen de manifest que existeixen alguns avantatges dels aliatges ZM enfront de recobriments Z, principalment pel que fa a la resistència a la corrosió, en haver trobat relacions que poden duplicar i triplicar el seu rendiment, en els períodes per als quals hi ha dades disponibles. De la mateixa manera, s'han trobat alguns desavantatges, que han d'investigar-se més a fons en futurs treballs de recerca, per a donar continuïtat a aquesta tesi. Per exemple, la limitació d'aquests recobriments per a aconseguir grans grossàries, la limitada duració dels assajos de camp, el rendiment en parts específiques dels components (talls, embuticions, doblegats, soldadures...), etc.
[EN] In recent years, numerous types of surface corrosion coatings, based especially on zinc-aluminium-magnesium alloys (known as "ZM" alloys), have been developed as alternatives to traditional zinc-based coatings (known as "Z"), to improve its technical characteristics and reduce its cost. The manufacturers of these new treatments claim greater resistance to corrosion, based on accelerated corrosion tests and field tests, the latter lasting only a few years. The main objective of this thesis is the structuring and analysis of all the existing information in the current state of the art, and in particular, the study of the existing field tests to corroborate their resistance to corrosion in different types of environments and based on this, propose a mathematical model that facilitates its long-term calculation. A review of the state of the art of metal coatings based on ZM alloys is presented, which covers their evolution over time, the different qualities and designations existing in the market, their structure and composition, international standards that regulate them and a detailed research on field tests in different locations around the world, having found tests of a maximum duration of 6 years. From the analysis of these field tests, a methodology is proposed to verify the performance and evolution of the corrosion-time function in the different exposure environments, categorized through the international standard ISO 9223 (ISO, 2012), which calls them "corrosivity classes", and which range is from C1 (very low) to CX (extreme). This analysis has classified all the test results by material, corrosivity class and evolution over time. In this way, each corrosivity class has been investigated in depth, through statistical analysis, with special emphasis on annual corrosion, measured as mass loss (µm / year), the corrosion-time function and its adjustment to a certain behaviour. The Z coatings have also been analysed to be able to compare both alternatives and corroborate the main hypothesis, whose main assumption is the greater resistance to corrosion of ZM alloys compared to Z coatings. This analysis has been the entry point to establish a mathematical model that determines the long-term corrosion performance, to provide project engineering professionals, with a tool to estimate the corrosion resistance and optimize the cost of an installation when different types of materials are used. The summary of all this analysis has been reflected in the Results and discussion section. The referred methodology has been applied to a case study to show how to select the quality of the coating and its optimal thickness, as well as a cost calculation, in order to guarantee the requirements of a specific project, in terms of resistance to corrosion and cost. The final conclusions show that there are some advantages of ZM alloys over Z coatings, mainly with regard to corrosion resistance, having found relationships that can double and triple their performance, in the periods for which there are data available. In the same way, some disadvantages have been found, which must be investigated further in future research works, to give continuity to this thesis. For example, the limitation of these coatings to achieve large thicknesses, the limited duration of field tests, the performance of specific parts of the components (cuts, embossments, bends, welds ...), etc.
Chenoll Mora, E. (2021). Analysis of metallic coatings based in zinc-aluminium-magnesium alloys, in terms of performance and long-term corrosion. Case study: Electrical cable trays selection in project design [Tesis doctoral]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/167418
TESIS
Kilic, Ergin. "Structured Neural Networks For Modeling And Identification Of Nonlinear Mechanical Systems". Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614735/index.pdf.
Texto completothis thesis proposed a general methodology for structured neural network topologies and their corresponding applications are realized. The main idea behind this (rather classic) divide-and-conquer approach is to employ a priori information on the process to divide the problem into its fundamental components. Hence, a number of smaller neural networks could be designed to tackle with these elementary mapping problems. Then, all these networks are combined to yield a tailored structured neural network for the purpose of modeling the dynamic system under study accurately. Finally, implementations of the devised networks are taken into consideration and the efficiency of the proposed methodology is tested on four different types of mechanical systems.
Naderian, Hamidreza. "Advanced Numerical Techniques for Dynamic and Aerodynamic Analysis of Bridges". Thesis, Université d'Ottawa / University of Ottawa, 2017. http://hdl.handle.net/10393/36089.
Texto completoGrossl, bade Tamiris. "Caractérisation du câblage des réseaux industriels de puissance en vue de la simulation CEM". Thesis, Université Grenoble Alpes (ComUE), 2019. http://www.theses.fr/2019GREAT038.
Texto completoThis work analyses the EMI problems that may arise in the large electric networks on industrial plants, taking into account the switching harmonics injected in these systems by power converters. The harmonics were studied in the frequency band from DC up to a few tens of MHz.To model the propagation of the switching harmonics in long electric cables, an accurate and computationally efficient simulation method is proposed. It is fit to simulate the behavior of medium frequency parasitic signals in large cabling networks, e.g. on industrial plants, buildings, and others. This method can be useful in the designing of such systems, contributing to the development of protection measures against dysfunction or damage that may be caused by EMI phenomena in the network
Stagni, Stefano. "Experimental evaluation of dielectric aging due to long TOV application in XLPE-insulated HVDC cables". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.
Buscar texto completoPurcarea, Calin [Verfasser], Peter [Akademischer Betreuer] Mutschler y Andreas [Akademischer Betreuer] Steimel. "High-frequency parasitic effects in electric drives with long cables / Calin Purcarea. Betreuer: Peter Mutschler ; Andreas Steimel". Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2011. http://d-nb.info/1106113144/34.
Texto completoEkelund, Maria. "Long-term performance of poly(vinyl chloride) cables : mechanical and electrical performances and the effect of plasticizer migration /". Stockholm : Fiber och polymerteknologi, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4405.
Texto completoTolan, Alexander Charles. "The effect of the number of log sorts on mechanised log processing productivity and value recovery in landing-based cable yarder harvesting operations". Thesis, University of Canterbury. School of Forestry, 2014. http://hdl.handle.net/10092/9218.
Texto completoCoco, Salvatore. "Ritmi stagionali negli Sparidi: 3 anni di video monitoraggio con l’osservatorio cablato OBSEA". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.
Buscar texto completoYucel, Mehmet Kerim. "Signal processing methods for defect detection in multi-wire helical waveguides using ultrasonic guided waves". Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/11219.
Texto completoRuy, Karine dos Santos. "Um longa na cabe?a e (bem) menos de R$ 1 milh?o na conta : estudo sobre a produ??o e a circula??o do cinema de baixo or?amento no Rio Grande do Sul". Pontif?cia Universidade Cat?lica do Rio Grande do Sul, 2016. http://tede2.pucrs.br/tede2/handle/tede/6925.
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Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES
The central theme of investigation for this paper is the Brazilian low-budget film industry. As a sample for analysis, we selected a group of seven feature films (A ?ltima estrada da praia, Castanha, Dromed?rio no Asfalto, Sobre sete ondas verdes Espumantes, Morro do C?u, Menos que Nada and O Liberdade), produced in Rio Grande do Sul and commercially released between 2011 and 2015. The study considers the low-budget film industry to encompass feature films with a maximum cost of BRL 1 million. This sample was stipulated based on the budget ranges covered by public policies for film-industry development, specifically the public notice for Low-Budget Feature Films from the Ministry of Culture's Audiovisual Secretariat. The paper sought to unveil the specific production and circulation methods for low-budget films, especially those covered by the scope of analysis. In this process, we began with a theoretical contextualization based on the investments from studies on the cultural economy, the film-making economy and the Brazilian film industry, while also mapping public policies for the development of the industry and market data that allowed us to outline the panorama in which the low-budget film industry of Rio Grande do Sul is inserted. For the study of selected films, we employed on-site, semi-structured interviews with the producers, which provided us with access to production records for the films and significant information in understanding the practice of low-budget film-making within a regional context. In this analysis we noted that, among other characteristics, the low-budget film industry of Rio Grande do Sul is punctuated by the use of smaller and similar teams in accord with the production unit, the professional character of the producers, the majority of whom originate or are still academically linked to higher education audiovisual programs; by the flexibility in work relationships and by capturing resources in stages, with the greatest difficulties faced in the finalization phase.
Esta tese tem como linha de investiga??o central o cinema de baixo or?amento brasileiro. Como recorte para a an?lise, selecionamos sete longas-metragens (A ?ltima estrada da praia, Castanha, Dromed?rio no Asfalto, Sobre sete ondas verdes espumantes, Morro do C?u, Menos que Nada e O Liberdade) realizados no Rio Grande do Sul e lan?ados comercialmente entre 2011 e 2015. A pesquisa entende como cinema de baixo or?amento os filmes de longa-metragem com custo m?ximo de R$ 1 milh?o. Esse recorte foi estipulado a partir de faixas or?ament?rias abrangidas por pol?ticas p?blicas de fomento ao cinema, em especial o edital para Longas de Baixo Or?amento da Secretaria do Audiovisual do Minist?rio da Cultura (Minc). O trabalho procura entender quais os modos de produ??o e circula??o espec?ficos dos filmes de baixo or?amento, em especial aqueles apreendidos pelo corpus da an?lise. Nesse processo, partimos de uma contextualiza??o te?rica baseada nos aportes dos estudos de economia da cultura, da economia do cinema e do cinema brasileiro, assim como de mapeamentos de pol?ticas p?blicas de fomento ao setor e dados mercadol?gicos que nos permitiram elaborar o panorama no qual est? inserido o cinema de baixo or?amento do Rio Grande do Sul. Para o estudo dos filmes selecionados, utilizamos entrevistas presenciais semi-estruturadas com os realizadores, as quais nos permitiram acessar as mem?rias de produ??o dos filmes e informa??es significativas para a compreens?o da pr?tica do cinema de baixo or?amento em um contexto regional. Identificamos, nessa an?lise, que o cinema ?B.O.? sul-rio-grandense ? marcado, entre outras caracter?sticas, pela utiliza??o de equipes enxutas e similares de acordo com o n?cleo de produ??o, pelo car?ter profissional dos realizadores, a maioria oriunda ou ainda vinculada academicamente aos cursos superiores da ?rea audiovisual; pela flexibiliza??o das rela??es de trabalho e pela capta??o de recursos em etapas, com maior dificuldade concentrada na fase da finaliza??o.
TSAI, YI-QING y 蔡易青. "Long-term Monitoring on the Stayed Cable of Kao Ping Hsi Cable-Stayed Bridge". Thesis, 2019. http://ndltd.ncl.edu.tw/handle/6eveu4.
Texto completo國立高雄大學
土木與環境工程學系碩士班
107
The cable-stayed bridge structure system is fixed to the pylon through one end of the cable, and the other connects with the deck to pull up the deck. If the cable is damaged, the structurl safety of the cable-stayed bridge may be affected. It may led to the bridge collapse in serious. Therefore, this study analyzed the long-term monitoring data of Kao Ping Hsi Cable-Stayed Bridge and then estimated the cable frequency and forces. The structure system of a cable-stayed bridge is to fix the pylon through one end of the cable and is to connect the other end with the deck, as to pull up the bridge structure. If one of the cables got broken, it would affect the structural safety of the bridge structure, and in the worst case the bridge would collapse. This study first collected the monitoring data of Kao Ping Hsi Cable-Stayed Bridge dated from December 2017 to November 2018. The data were then analyzed using Fourier transform and the obtained frequencies were used to estimate the cable forces. The result of the analysis was finally used to set up a warning system, which helps check if the cables need repairing or replacing.
Liu, Chung-Huan y 劉仲桓. "Seismic Analysis of Long-Span Cable-Stayed Bridges". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/e44e3d.
Texto completo中原大學
土木工程研究所
93
A finite element computation procedure for static and dynamic analysis of 2-D and 3-D long-span cable-stayed bridge under action of seismic loads is presented in the study. The Three Span Twin Tower Symmetric Cable-Stayed Bridge is taken as example. The system equation of cable-stayed bridges including the nonlinearities due to beam-column, cable sag and large displacement effects are considered. First of all, the initial shape of cabled-stayed bridge is determined by using shape iteration technique. Based on the initial shape the deflection, natural frequencies and modes and dynamic responses seismic action are determined. The numerical results show that the vibration of girder appears in the form of anti-symmetry under horizontal X seismic excitation. The mid point of girder has no displacement. After considering the large displacement effect, the non-linear effect is comparatively obvious. The vibration of girder appears in the form of symmetry under vertical seismic excitation.
Chang, Yo-Min y 張祐銘. "Study on Middle-span and Long-span Cable-stayed Bridges with Carbon Fiber Composite Cables". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/34143925325698069534.
Texto completo中華大學
土木工程學系碩士班
93
Cable-stayed bridges have large deformation because of smaller stiffness, therefore, geometrical and material nonlinear analysis of flexible cables are token into account in this study. Cable-stayed bridges are traditionally constructed with steel cables. However, steel cable always has corrosion problems. As carbon fiber composite cable possesses the anti-corrosion merit, it becomes an important issue to investigate the possibility of using carbon fiber composite cable instead of steel cable. In this paper, the analytical models of long-span cable-stayed bridges with carbon fiber composite cable and steel cable are established, and the analytical results are examined. There are two models established in this paper, one is for analyzing the structural behaviors of the long-span cable-stayed bridges under dead load and live load, the other is for those under wind load. In addition, the influence of cable to the structural behaviors of the long-span cable-stayed bridges is examined as well. The numerical results have shown that, the axial stiffness of carbon fiber composite cable is less than that of steel cable, due to the elastic modulus of carbon fiber composite cable less than that of steel cable. The results have also shown that after using carbon fiber composite cable, the moment and the vertical displacement of main girder, as well as the moment and the horrizontal displacement of tower have increased. However, the tensile force of cable and the axial force of main girder and tower have decreased. In addition, the static instability under wind load becomes significant while using carbon fiber composite cable, and the ultimate load-bearing capacity had increased. This research demonstrated that using carbon fiber composite cable instead of steel cable is an acceptable choice.
Huang, Chi-Ti y 黃啟臺. "The Ground Fault Characteristics of Large Plant with Long Cable Connection to Cable Connection Station". Thesis, 2007. http://ndltd.ncl.edu.tw/handle/53163634433657167152.
Texto completo中原大學
電機工程研究所
95
This thesis in to steady the ground fault current and voltage appeared on grounding system and cable shielding conductor with may produce hazard on personnel and cables for the large plant with long cable interconnections to cable connection station (CCS) ﹒The single-phase-ground faults with respect to the fault locations of main transformer, switchyard and CCS are analyzed by using electromagnetic transient program/alternative transient program(EMTP/ATP) and considering transient state and steady state of ground fault﹒The circuit model constructed by EMTP/ATP will take the ground grids of generation unit, switchyard and CCS into account﹒The cross bonding and surge arresters installed in the cable cover protection unit (CCPU) for cable shielding conductors are considered in the model﹒All the analysis will aim to the main transformer neutral points with solid grounded and with arresters Based on the analysis results of fault currents injected into ground grids , a soft were package called CDEGS is used to analyze the characteristics of grounding system including ground potential rise(GPR) , touch voltage , step voltage and electromagnetic field distributed on the ground surface﹒The affections of these characteristics on personnel and equipments are evaluated﹒The study results had shown that danger touch voltage will appear on fault points and cable shielding conductor﹒Several kV and kA of cable shielding conductor voltages and currents will be arrised ﹒Thus , cable shielding conductors with defect connection may induce large hazard due to their high voltages and currents﹒
Chang, Cheng-Fa y 張正發. "Transient Over-Voltage Analysis of Long Distance Cable Fed Transformer". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/00519109124434688958.
Texto completo長庚大學
電機工程研究所
93
This paper introduces the transients over voltage analysis of a long distance cable fed transformer system with the EMTP-RV and ATPDraw. First, the transient over voltage behaviors and the insulation coordination of power system are induced. Then, an industrial power system with a long distance cable fed transformer is built for transient over voltage analysis. The EMTP-RV and ATPDraw is employed for simulation. Several possibly occurred cases regarding transient over voltage phenomena are chosen for simulations and evaluations. Finally, the capacitance of the cable is neglected for additional simulations and comparisons.
Huang, Chen-Yao y 黃辰堯. "Section Model Test and Full Bridge Model Test of Long-Span Cable Stayed Bridge". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/g2kadu.
Texto completo中原大學
土木工程研究所
93
Early of the Twentith century, suspended bridge is the main type of the bridges such as Golden Gate bridge in 1937. With the computer development, cable-stayed bridges are on the upgrade after the world war Ⅱ. People have some demands about environment, economics, esthetics, and comfort, besides security. Because the cable-stayed bridge fit in with the conditions, it becomes one of the main types of the bridges. For cable-stayed bridges, the first course is the influence of the flutter, the buffeting, and the vortex shedding in cable-stayed bridge’s design and analysis. This article is composed with wind tunnel test of a cable-stayed bridge designed for the Taipei metropolitan area(include section model test and full model test) and the result of the formulas for wind velocity of flutter, buffeting, and vortex shedding. With the development and the progress of the bridge engineering technique, the span of the bridge is getting longer. The influence of the wind-force is an important factor that can't be ignored in long-span bridges design.
Weng, Wei-Tse y 翁瑋澤. "Ground Fault Characteristics of Grounding System in the Large Plants with Long Cable Interconnections". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/90768385945251405723.
Texto completo中原大學
電機工程研究所
93
This work regards the characteristics of grounding system during steady state grounding fault on the multi-unit large plant with long cable connection to system. The ground potential rises (GPR), touch voltages, step voltages and electromagnetic fields caused by grounding fault are first analyzed by the software “CDEGS”, and the current and voltage distributions on the shielding conductors of cable are studied. In the thesis, the worst fault current is analyzed by sequence network where the ground grids of generator unit and switch yard and cable shielding conductors are considered. The study results had shown that the ground fault current will increase with the number of main transformer with neutral grounded directly. This will increase the hazards in the switch yard ground grid. The effects of capacitances of the cable on steady state ground fault current can be neglected. This study provides useful data for planning the improvement strategies of large plant ground system.
Huang, Meng-Chun y 黃孟群. "Switching Surge Characteristics of Grounding System in the Large Plant with Long Cable Interconnections". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/94213374775198847317.
Texto completo中原大學
電機工程研究所
93
The switching surge characteristics in a large plant with long cable connection are more serious than other conventional plant due to large capacitances in the cables. Both power system and grounding system suffered from switching surge, the latter produces various electromagnetic phenomena including ground potential rise(GPR), step and touch voltages, and magnetic field distributions. This thesis analyzes these phenomena and assesses their affections on personnel and equipments in the plant. The electromagnetic transient program(EMTP) is used for analyzing the switching surge currents and voltages on the various important grounding points, and then a software namely “Current distribution electromagnetic grounding and soil structure”(CDEGS) is used for analyzing the electromagnetic phenomena distributions. Both the EMTP model and CDEGS model are constructed where the grounding scheme and various parameters are detail defined ,Further more, the switch operation modes, different neutral grounding conditions of main transformer, unit connect types and the residual voltage in cable inner conductor are taken into considerations for the analysis of switching surge currents and voltage ,and various electromagnetic distributions on the ground grids. The results of analysis and assessments have shown that bad switching surge characteristics of grounding system due to long cable are found. This will lead to adverse effects on the safeties of personnel and equipments in the plant . The study had also provided some useful data of some phenomena for improving the switching surge characteristics of grounding system in the plant.
Young, Ku-Shon y 楊凱翔. "Stress Analysis of Anchorage Zone By Using the FEM of Long-Span Cable-Stayed Bridge". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/a8hemx.
Texto completo中原大學
土木工程研究所
93
Abstract Long-span cable-stayed bridge is a very important trend of technological development of modern bridge. Cable-stayed bridge composed of three major components which are deck, pylon and cable. The anchorage design of the pylon is the key part of the design of cable-stayed bridge. The design principle focuses on the determinate design force with simple structural model to make the replacement of cables and construction feasible. The stress concentration phenomena of the anchorage zone could be very complicated and significant, therefore, prestressed steel bars are used to resist the cable force. In this paper, the numerical analysis of the anchorage zone of the cable-stayed bridge designed for Taipei metropolitan area is carried out by ANSYS 8.1, the analysis software of FEM. The goal is make sure the safety of the anchorage zone of the cable-stayed bridge. Key words: cable-stayed bridge; concrete pylon; stress analysis
Tsai, Cheng-Hung y 蔡政宏. "The Auxiliary Piers Effects of Ultimate Load-Bearing Capacity of Long-span Cable-stayed Bridges". Thesis, 2004. http://ndltd.ncl.edu.tw/handle/31595983406464142719.
Texto completoTsay, Jiunn-Yin. "Wind-induced Instability of Cable-Supported Bridges and Feasibility Study of Super-Long Span Bridges". 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2201200812540700.
Texto completoWang, Kuo-Ling y 汪國玲. "The Study of Interorganization Long-Term Cooperation Relationship:The Case of Cable Television Hardware Suppliers in Taiwan". Thesis, 2005. http://ndltd.ncl.edu.tw/handle/65893711125820127718.
Texto completo淡江大學
國際貿易學系國際企業學碩士班
93
Nowadays, cable television hardware suppliers in Taiwan are facing factors of limited growth of subscription, technology progress, digitalized challenges, impacts from cross-competitions and tendency to cooperate for multimedia industry. Consequently, cooperation relationship is gradually built up with parties in industry in order to raise competitive advantages. It lacks of long-term cooperation relationship studies in academic research for cable television industry. Therefore, this thesis is based on the vertical cooperation between domestic cable television hardware suppliers and cable television system operators to analyze the factors that influence long-term cooperation relationship between organizations, relationship quality effects toward to the long-term relationship, role position of switching barrier in cooperation relationship and factors that composed relationship quality. This thesis is a case study of cable television hardware suppliers in Taiwan. We analyzed 62 effective surveys, in order to understand how variable evaluation for relationship quality and switching barrier influences long-term cooperation relationship. Conclusions are as followings: 1.Customer satisfaction and switching cost are major factors that influence long-term cooperation relationship development between organizations. 2.Customer satisfaction is the major factor of relationship quality that influences persistency of the long-term cooperation relationship. 3.Due to the characteristics of CATV industry, switching barrier and long-term cooperation relationship respond to the significant positive phase level as result in switching barrier. 4.Essentials that compose relationship quality are trust, relationship commitment and customer satisfaction. However, customer satisfaction is the most important and influences mostly to the relationship quality.
WEI, HSIN-YU y 魏信裕. "The Characteristics Simulation and Analysis of Grounding System for Long Distance Extra High Voltage Underground Cable". Thesis, 2016. http://ndltd.ncl.edu.tw/handle/j92xaj.
Texto completo國立高雄應用科技大學
電機工程系博碩士班
104
In recent years, in order to enhance the electricity quality and to reduce the people’s contend, transmission line is designed with underground approach for urban area and science parks. Since the voltage level of cable become larger and severed transient behavior seriously affect system reliability, the underground cable is necessary from EHV substation to EHV substation. Once cable is striking by switching impulse and its transient is travelling along cable; the damage will seriously affect the operation and life time of cable. In order to increase the cable operating life time, the explore and analysis of switching transient is required. This thesis applies the EMTP/ATP software tool to establish the equivalent circuit model to simulate the behavior of circuit breaker switching transient for underground cable. A 10 km Kaokang-Wuchia section of Kaokang-Wuchia-Kaohsiung loop built in 2014 is selected for computer simulation examined the correlation between switching transient and cable characteristics to justify the effectiveness of the proposed method.The simulations results can be used as reference for design of underground cable of Taipower. Moreover, the proposed method will apply to other transmission line to enhance the electricity quality and reliability.
Lai, Tai-Hsiang y 賴泰翔. "Long-Pulse Transmission Line Pulsing Technique for Cable Discharge Event (CDE) Protection in CMOS Integrated Circuits". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/07774396274728358409.
Texto completo國立交通大學
電子工程系所
94
Cable discharge event (CDE) has been the main cause which damages the Ethernet interface. The transmission line pulsing (TLP) system has been the most important method to observe the electric characteristics of the device under human-body-model (HBM) ESD stress. To understand the physical characteristics and CDE robustness of protection device in the wafer level, the long-pulse transmission line pulsing (LP-TLP) system has been set up and used to simulate the influence of CDE on the Ethernet integrated circuits and to measure and analyze the secondary breakdown characteristics of the CDE protection devices. Furthermore, the measured results by using the LP-TLP system are compared with those by using the traditional 100-ns TLP system. The experimental results have shown that the CDE robustness of NMOS and PMOS devices in deep-submicron CMOS technology is much worse than their HBM ESD robustness.
Tzeng, Ying-Chang y 曾盈昌. "Affections of Ground Fault on the Cable and Grounding System in the Large Plants with Long Cpble Interconnections". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/83722025886121400561.
Texto completo中原大學
電機工程研究所
94
Abstract In the large plant with long cables interconnection between generator units and switchyard , large current and high voltage will appear on the cable shielding conductors and grounding system during ground fault on switchyard. Form which the cable and equipment may be damaged even hurt personnel. In this thesis , typical plant with the above problems is studied , The circuit model based on electromagnetic transient program/alternative transient program (EMTPATP) is constructed and analyzed for ground fault on the switchyard at transient state and steady state . The ground grids of switchyard and generator units , the phase conductor and shielding conductors of cable and the main transformer of generation unit are all considered in the modal . In which , the cable shielding conductor with cross-transposition-connection and grounded by arrester in the cable-cover-protection unit (CCPU) are detailly considered in the model . The grounded types of neutral points of mantransformers of generator unit and starting transformer include solid-grounded and arrester-grounded type which are considered is the analysis of ground fault . The transient state and steady state currents and voltages distributed on the cable shielding conductors and the grounding points of cable shielding conductors and transformer neutral point on the ground grids can be obtained from the simulation by ATP . Finally , the affections of ground fault on the cable and grounding system are evaluated lased on the simulation results. In which , the damages on the connections and CCPU arresters of cable shielding conductor are surveied and the electromagnetic characteristics of ground grids are further analyzed by a software package, namely, “current distribution electromagnetic grounding and soil structure analysis”(CDEGS). From which ,we can obtain the electromagnetic the distribution of ground potential rises (GPR) , touch voltage ,step voltage and electromagnetic field on the ground surface of ground grids of switchyard and generate unit . Based on the electromagnetic characteristics , their affections on personnel and equipment are assessed . In the whole ,the study results have shown that the personnel and equipments will be danger at switchyard and touch to cable may shielding conductor during ground fault , and the cable may be damaged by large current with several kA and high voltage kV on the shielding conductors if their connection parts are not treated well.
Psonak, Kevin Damien. "The long line of the Middle English alliterative revival : rhythmically coherent, metrically strict, phonologically English". Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-05-5044.
Texto completotext
Purcarea, Calin. "High-frequency parasitic effects in electric drives with long cables". Phd thesis, 2011. https://tuprints.ulb.tu-darmstadt.de/2836/1/Dissertation_Purcarea_2011.pdf.
Texto completoLin, Heng-An y 林恆安. "Protection Zone Planning of Distance Relay for the Long Submarine Cables of Large Offshore Wind Farm". Thesis, 2014. http://ndltd.ncl.edu.tw/handle/mwv45j.
Texto completo國立臺北科技大學
電機工程系所
102
This thesis is to study the protection zone planning of distance relays for long submarine cables of large offshore wind farm. A case study based on Tai-Peng submarine cables of Peng-Hu offshore wind farm with type-C double-fed induction wind generators is presented. A software package namely PSS/E is used for the modeling and simulation. Three protection zones are defined for submarine cable distance relays and the three phase short circuit (3ΦSC) fault characteristics of different protection zones are simulated under different wind farm operation situations. The availabilities of distance relays are surveyed including to find the defects of conventional planning and to proposed improved planning of protection zones. The study results show that the conventional quadrilateral distance relay can not provide sufficient protection for long submarine cables because of neglecting the effects of cable capacitances and the variations of wind farm operation. Therefore, a novel quadrilateral protection zone for distance relay is panned considering the effects of cable capacitances and the variations of wind farm operation. The availabilities of proposed planning had been certified by PSS/E simulation, which is also a good reference for the planning of long cable protection coordination.