Relevant bibliographies by topics / High Voltage Overhead Transmission Lines / Dissertations / Theses
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Dissertations / Theses on the topic 'High Voltage Overhead Transmission Lines'

Author: Grafiati
Published: 11 December 2022
Last updated: 26 January 2023

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1

Mtanga, Jameson Joseph. "Dynamic modeling and vibration control of high-voltage overhead transmission lines." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/5022.

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Includes abstract.<br>Includes bibliographical references (leaves 140-144).<br>The problem of the dynamic behavior of overhead power transmission lines under wind and other excitations is an important one, since it allows an optimal design and positioning of vibration dampers for the cables. Excessive sway and oscillation of power lines need to be avoided, as they can lead to damage of the lines and power interruptions. The relatively high flexibility of the cables, coupled with the large spans and large sags involved, make the dynamic response of the system highly nonlinear. In this study, we
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2

Naredo, V. José Luis A. "Communication frequency response of high voltage power lines." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26725.

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Several methods for calculating the electrical phase and modal parameters of overhead transmission lines are described in this thesis; then, a graphical method for evaluating communication frequency response of delta transmission lines -based on the guidelines given by W. H. Senn [12,13,14]- is developed. The graphical method, combined with the parameters calculation methods, obviates the need of large mainframe computers for the analysis of power line carrier (PLC) systems. A new technique for assessing coupling alternatives, based on Senn's method, is developed. The technique is applied to
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3

Crnojacki, Zorica. "Extra high voltage transmission corridor siting : technical, public, institutional and regulatory considerations /." Diss., This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-10032007-171749/.

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4

Callanan, Judith Marie. "Assessing the property market impact of stigma removal : high voltage overhead transmission lines removal in Wellington, NZ." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/71885/2/Judith_Callanan_Thesis.pdf.

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This thesis advances the understanding of the impact of stigma on property values. A case study in Wellington, New Zealand, enabled hedonic modelling and an empirical analysis to determine the impact of the stigma from the high voltage transmission line structure and how long the stigma remained after removal. The results reveal a substantial difference between the discount applied to individual properties while the structure is in place, as compared to the overall increase in neighbourhood value once the structure, which created the stigma, is removed.
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5

Martinho, Lucas Blattner. "Numerical modeling of electromagnetic coupling phenomena in the vicinities of overhead power transmission lines." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-28062016-152807/.

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Les phénomènes de couplage électromagnétique entre les lignes aé- riennes de transmission d\'énergie et des structures voisines sont inévitables, surtout dans les zones densément peuplées. Les effets indésirables découlants de cette proximité sont variés, allant de l\'établissement des tensions dangereuses à l\'apparition de phénomènes de corrosion dus au courant alternatif. L\'étude de cette classe de problèmes est nécessaire pour assurer la sécurité dans les alentours de la zone d\'interaction et aussi pour préserver l\'intégrité des équipements et des dispositifs présents. Cependant, la mod
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6

Lawson, Allan Brett. "Environmental impact assessment in the routing of high voltage overhead transmission lines : theory and practice in South Africa." Master's thesis, University of Cape Town, 1996. http://hdl.handle.net/11427/16103.

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Includes bibliographies.<br>This study resulted from a perception held by the author that more attention is afforded to complying with the procedural elements of Environmental Impact Assessment (EIA) in South Africa, than to ensuring the validity of its technical content. The routing of high voltage overhead transmission lines provides a relevant field of study in which to address this perception. An initial literature review to contextualise the perceived problem showed that the questionable validity of the technical content of EIA was one of six shortcomings identified. To address the proble
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7

Hussin, Mohd Fahmi. "Voltage transducer for fault monitoring on high voltage overhead lines." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/65731/.

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Overhead lines are the backbone of electrical power transmission. In most cases, the overhead line provides the best economic and practical solution for energy transmission. Nevertheless, overhead lines suffer more faults due to the vulnerability of the overhead lines to adverse weather condition, transient overvoltage and falling trees. An extensive literature review of existing condition monitoring and impulse a voltage measurement technique of overhead lines are covered in this work, and ultimately leads to the development of the proposed voltage transducer. Although conventional transducer
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8

Ahmed, Yasir E. "Modelling of microshocks associated with high voltage overhead lines." Thesis, University of Manchester, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.625456.

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Microshocks can be described as the unpleasant discharges experienced by people capacitively coupled to high voltage equipment once a contact is established between their finger-tips and another object at different potential. The situations in which these discharges occur are complicated and very limited research has been conducted so far in this area. The work presented in this thesis aims to enhance the understanding of the microshocks phenomenon, and in particular, focuses on exposure to microshocks by overhead transmission line workers before developing mitigation techniques to prevent the
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9

Langlois, Sébastien 1981. "Design of overhead transmission lines subject to localized high intensity wind." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99775.

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Wind loading considered in the design of overhead transmission lines is based on extreme values of synoptic wind, i.e. boundary layer wind originating from largescale meteorological pressure systems. Localized high intensity wind (HIW) storms such as tornadoes and downbursts are a different type of extreme wind frequently causing failures of overhead lines. This thesis covers the design aspects of overhead transmission lines when subject to localized HIW storms. A comprehensive review of the literature is included on the effects of such wind storms on lines and on mitigation measures. Furtherm
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10

Cameron, Gordon. "Steady state inductive influence of high voltage transmission lines." Thesis, University of Canterbury. Electrical and Electronic Engineering, 1993. http://hdl.handle.net/10092/5592.

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Harmonic current flows within High Voltage transmission lines induce voltages in neighbouring metallic conductors be they fences, pipelines, other transmission lines or telecommunications cables. These voltages may endanger organisms which come into contact with the conductors or impair the operation of electrical systems connected to them. Under steady state operating conditions the induced voltages are seldom of sufficient magnitude to be hazardous, however they are on occasions severe enough to impair telecommunications services. With the increasing use of non-linear loads within the power
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11

Černín, Kamil. "Reconstruction of conductor movement and monitoring of high voltage lines." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218765.

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Tahle práce se zabývá monitorováním venkovních vysokonapěťových vedeních, což mohou být vedení od 70kV do 400kV. Senzory jsou umístěny na vodiči a hlavní myšlenkou je vyhodnotit mechanické chování vodičů, a to od nízkých frekvencí (zlomky Hz) až po vysoké frekvence (desítky Hz). Tahle práce se zabývala pohyby o nízkých frekvencích a vysokých amplitudách a popsala možnosti sestavení těchto pohybů na základě měření ze senzorů. Konkrétně se jedná o pohyby v případě silného větru, zkratu, opadávání ledu nebo dalších. Všechno tohle pomáhá operátorů dělat rozhodnutí ohledně provozování sítí. Vývoj z
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12

Chen, Shelley L. "Programs for calculating high temperature ampacity and sag for overhead electrical conductors." Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/17933.

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13

Flazi, Samir. "Etude du contournement electrique des isolateurs haute tension pollues : critere d'elongation de la decharge et dynamique du phenomene." Toulouse 3, 1987. http://www.theses.fr/1987TOU30266.

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Etude de l'aspect statique du contournement, on montre experimentalement que les criteres de wilkins et hampton ne s'appliquent qu'au modele d'obenaus. Mise en evidence de l'importance du champs electrique au voisinage de la decharge. Etude detaillee de la conduction electrolytique et de son evolution pendant le contournement
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14

Najafi, Syed Ahmed Ali. "Energy Harvesting From Overhead Transmission Line Magnetic Fields." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1548448189459464.

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15

Brown, Martin. "High voltage soliton production in nonlinear transmission lines and other pulsed power applications." Thesis, University of Oxford, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.364003.

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16

Sims, Sally Caroline. "The impact of high voltage overhead power lines on the value of residential property in the United Kingdom." Thesis, Oxford Brookes University, 2004. https://radar.brookes.ac.uk/radar/items/47d4ec9e-e187-4218-b8da-5371c528a5da/1.

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This thesis investigates the impact of electricity distribution equipment on the value of residential units in the UK. This is a complex task, due to the potential influence on the market from the publics' perception of a perceived link between living in close proximity to high voltage overhead power lines (HVOTLs) and a number of adverse health effects. A review of the literature revealed that no previous studies had been undertaken within the UK to establish the impact of HVOTLs on house prices and as such, identified a gap in knowledge within the UK and provided a focus for this thesis. Due
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17

Elmas, Erinc Evren. "Protection Of Transmission Lines Against Switching Overvoltages." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605607/index.pdf.

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Any switching action or lightning stroke on a transmission system causes excessive of voltage, which are propagated through the equipment. The withstand capability of the electrical equipment to these overvoltages is dependent on the rate of rise, peak value and the duration of these overvoltages and are especially critical to information technology (IT) equipment. Whenever there is a probability of these overvoltages appearing across the electrical equipment, they should be limited to a safe value by the application surge arresters of the metal oxide type. However, surge arresters are expen
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18

Kapuduwage, Sarath, and skapuduwage@hotmail com. "Fault Location on the High Voltage Series Compensated Power Transmission Networks." RMIT University. Electrical and Computer Engineering, 2007. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080418.120506.

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Nowadays power transmission networks are capable of delivering contracted power from any supplier to any consumer over a large geographic area under market control, and thus transmission lines are incorporated with FACTs series compensated devices to increase the power transfer capability with improvement to system integrity. Conventional fault location methods developed in the past many years are not suitable for FACTs transmission networks. The obvious reason is that FACTs devices in transmission networks introduce non-linearity in the system and hence linear fault detection methods ar
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19

Tong, Sai-kit. "A computer-aided measurement system for monopolar high-voltage direct-current coronating lines /." [Hong Kong] : University of Hong Kong, 1986. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12321771.

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20

湯世傑 and Sai-kit Tong. "A computer-aided measurement system for monopolar high-voltage direct-current coronating lines." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1986. http://hub.hku.hk/bib/B31207467.

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21

van, Rensburg Karel Jensen. "Analysis of arcing faults on distribution lines for protection and monitoring." Thesis, Queensland University of Technology, 2003. https://eprints.qut.edu.au/15800/1/Karel_van_Rensburg_Thesis.pdf.

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This thesis describes an investigation into the influences of arcing and conductor deflection due to magnetic forces on the accuracy of fault locator algorithms in electrical distribution networks. The work also explores the possibilities of using the properties of an arc to identify two specific types of faults that may occur on an overhead distribution line. A new technique using the convolution operator is introduced for deriving differential equation algorithms. The first algorithm was derived by estimating the voltage as an array of impulse functions while the second algorithm was derive
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22

van, Rensburg Karel Jensen. "Analysis of arcing faults on distribution lines for protection and monitoring." Queensland University of Technology, 2003. http://eprints.qut.edu.au/15800/.

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This thesis describes an investigation into the influences of arcing and conductor deflection due to magnetic forces on the accuracy of fault locator algorithms in electrical distribution networks. The work also explores the possibilities of using the properties of an arc to identify two specific types of faults that may occur on an overhead distribution line. A new technique using the convolution operator is introduced for deriving differential equation algorithms. The first algorithm was derived by estimating the voltage as an array of impulse functions while the second algorithm was derive
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23

Cheong, Wai Jing. "Accurate fault location in TCSC high voltage transmission lines using combined wavelet transform and artificial neural network." Thesis, University of Bath, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.425674.

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24

Mohd, Noor Mohd Junaizee. "Application of knowledge-based fuzzy inference system on high voltage transmission line maintenance." Thesis, Queensland University of Technology, 2004. https://eprints.qut.edu.au/16050/1/Mohd_Junaizee_Mohd_Noor_Thesis.pdf.

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A majority of utilities conduct maintenance of transmission line components based on the results of routine visual inspection. The inspection is normally done by inspectors who detect defects by visually checking transmission line components either from the air (in helicopters), from the ground (by using high-powered binoculars) or from the top of the structure (by climbing the structure). The main problems with visual inspection of transmission lines are that the determination of the defects varies depending on the inspectors' knowledge and experience and that the defects are often rep
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Mohd, Noor Mohd Junaizee. "Application of knowledge-based fuzzy inference system on high voltage transmission line maintenance." Queensland University of Technology, 2004. http://eprints.qut.edu.au/16050/.

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A majority of utilities conduct maintenance of transmission line components based on the results of routine visual inspection. The inspection is normally done by inspectors who detect defects by visually checking transmission line components either from the air (in helicopters), from the ground (by using high-powered binoculars) or from the top of the structure (by climbing the structure). The main problems with visual inspection of transmission lines are that the determination of the defects varies depending on the inspectors' knowledge and experience and that the defects are often rep
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26

Krige, Ernst. "Harmonic interaction between weak AC systems and VSC-based HVDC schemes." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71704.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: The implementation of the Caprivi Link Interconnector (CLI) High Voltage Direct Current (HVDC) scheme in 2010 connecting the weak Namibian and Zambian Alternating Current (AC) transmission networks via overhead line is based on Voltage Source Converter (VSC) technology. This world-first combination of attributes presents a unique opportunity to study harmonic interaction between weak AC systems and VSC-based HVDC schemes. Relatively few publications exist that focus on AC and DC harmonic interaction and very few refer to VSC
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27

Lee, Jack Monroe Jr. "Seasonal Patterns of Melatonin, Cortisol, and Progesterone Secretion in Female Lambs Raised Beneath a 500-kV Transmission Line." PDXScholar, 1992. https://pdxscholar.library.pdx.edu/open_access_etds/1317.

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There is ongoing controversy about the possibility of adverse biological effects from environmental exposures to electric and magnetic fields. These fields are produced by all electrical equipment and appliances including electrical transmission lines. The objective of this environmental science study was to investigate the possible effects of a high voltage transmission line on domestic sheep (Ovis aries L,), a species that can often be found near such lines. The study was primarily designed to determine whether a specific effect of electric and magnetic fields found in laboratory animals als
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28

Visser, Abraham Johannes. "Transformerless series dip/sag compensation with a multilevel cascaded inverter." Thesis, Stellenbosch : Stellenbosch University, 2001. http://hdl.handle.net/10019.1/52592.

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Thesis (MScEng)--University of Stellenbosch, 2001.<br>ENGLISH ABSTRACT: This thesis covers the development of a multilevel cascaded inverter for the purpose of costeffective transformerless series dip compensation. Of all known power quality problems, voltage dips are the greatest reason for concern. Dips/sags occur more frequently than outages and therefore tend to be more costly for industry as modem technical equipment becomes all the more sensitive to the quality and reliability of supply. A number of devices already exist to compensate for this problem, but the cost of most of thes
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Mishra, Chinmaya. "Design and implementation of low power multistage amplifiers and high frequency distributed amplifiers." Texas A&M University, 2004. http://hdl.handle.net/1969.1/2775.

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The advancement in integrated circuit (IC) technology has resulted in scaling down of device sizes and supply voltages without proportionally scaling down the threshold voltage of the MOS transistor. This, coupled with the increasing demand for low power, portable, battery-operated electronic devices, like mobile phones, and laptops provides the impetus for further research towards achieving higher integration on chip and low power consumption. High gain, wide bandwidth amplifiers driving large capacitive loads serve as error amplifiers in low-voltage low drop out regulators in portable device
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30

Lang, Ian Dewi. "The degradation of all-dielectric self supporting cables installed in high potential electro-magnetic fields : a theoretical and practical evaluation of optical fibre cables strung independently on overhead power transmission lines." Thesis, University of South Wales, 2001. https://pure.southwales.ac.uk/en/studentthesis/the-degradation-of-alldielectric-self-supporting-cables-installed-in-high-potential-electromagnetic-fields(5a7dee38-9f9b-40f8-8259-2e3d5386e292).html.

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The operational life of all-dielectric self supporting (ADSS) optical fibre cables installed on high voltage over-head power transmission lines is limited by sheath degradation caused by induced electrical activity on the cable's surface. The work presented in this thesis describes research completed to quantify this degradation. This has resulted in a novel analysis method being developed and used to associate product testing with field trial results. The analysis is based on evaluating the magnitude of recorded electrical activity and fitting an appropriate distribution to the data to descri
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31

Roets, Hendrik Adriaan. "Effect of altitude on audible noise generated by AC conductor corona." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71810.

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Thesis (MScEng)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: Power utilities are expected to keep the cost of electricity as low as possible. They are also expected to be environmentally friendly and, amongst other things, not to produce unacceptable audible noise. When the electric field on a conductor is high enough corona is produced and this is accompanied by audible noise. Air pressure, which is directly related to altitude, has an effect on the voltage at which corona will start. It is more difficult to ionise the air at sea level (high air pressure) than at high altitude (l
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Silveira, Patrícia Oliveira da. "Planejamento de sistemas de transmissão em área com fonte de geração intermitente, apoiado no uso de tecnologias avançadas." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/3/3143/tde-27062017-105858/.

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O Brasil é um país de dimensões continentais, onde existe uma considerável distância entre a geração e os principais centros de consumo. Dessa forma, o estudo e desenvolvimento de novas tecnologias de transmissão a longas distâncias é de fundamental importância para o desenvolvimento do país. A solução mais utilizada atualmente é a transmissão em corrente alternada. Entretanto a transmissão em corrente continua também é uma solução viável para longas distâncias. O sistema brasileiro é composto principalmente por linhas 500 kV em corrente alternada (também há 230; 345; 440 e 750 kV), bem como e
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Bailey, Etienne Benjamin. "Understanding local public responses to a high-voltage transmission power line proposal in South-West England : investigating the role of life-place trajectories and project-related factors." Thesis, University of Exeter, 2015. http://hdl.handle.net/10871/17948.

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With a projected increase in electricity demand and low-carbon energy generation in the UK, expansion of the existing transmission grid network is required. In going beyond the NIMBY concept, Devine-Wright (2009) posited a place-based approach that highlights the roles of place attachment and place-related symbolic meanings for understanding public responses to energy infrastructure proposals. This PhD research investigated two overarching and interrelated research aims. The first sought to enlarge our understandings of the processes of attachment and detachment to the residence place by inves
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Valuntaitė, Vaida. "The Investigation and Assessment of the Man-made Ozone Formation and Dispersion." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20090608_190741-86415.

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The dissertation comprises the general characteristic of the work, 5 chapters, conclusions and recommendations, references and list of published works on the topic of the dissertation. The dissertation covers 149 pages, 78 illustrations, 17 tables. In introduction chapter the problem topicality is considered, the aims and tasks of the work are formulated, the novelty of the research is described, the author’s reports and publications as well as the dissertation structure are presented. Chapter 1 is intended for the review of literature. The survey of ozone sources in working premises and the
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35

Chromík, Aleš. "Vyvedení výkonu z rozvodny 110/22 kV Moravany u Brna." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2013. http://www.nusl.cz/ntk/nusl-220293.

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The aim of this Master’s thesis is the design and reconstruction of the high voltage distribution network for the company E. ON with focus on calculation of the stabilized operation and on the planning of new cable taps from the transformer substation Moravany u Brna. The first part of the theoretical analysis of the work deals with the inclusion of the distribution network into the power system and with principles of development and construction of high voltage networks. The second part includes a general calculation of stabilized operation of the power distribution network and a familiarizat
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Yang, Yi. "Power line sensor networks for enhancing power line reliability and utilization." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41087.

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Over the last several decades, electricity consumption and generation have continually grown. Investment in the Transmission and Distribution (T&D) infrastructure has been minimal and it has become increasingly difficult and expensive to permit and build new power lines. At the same time, a growing increase in the penetration of renewable energy resources is causing an unprecedented level of dynamics on the grid. Consequently, the power grid is congested and under stress. To compound the situation, the utilities do not possess detailed information on the status and operating margins on their
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Alles, Joan. "Investigations on flashover of polluted insulators : Influence of silicone coating on the behavior of glass insulators under steep front impulse." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC058.

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Cette thèse s’inscrit dans le cadre de l’amélioration du comportement électrique des isolateurs de lignes haute tension ; l’objectif est d’assurer une meilleure fiabilité et qualité d’alimentation en énergie électrique. Ce travail a été motivé par la nécessité de répondre à trois questions liées au comportement des isolateurs verre en zone polluée. La première porte sur la recherche d’une méthode permettant de calculer la tension de contournement des chaînes polluées selon le type d’isolateur et ses caractéristiques. La deuxième question concerne la différence de comportement entre les isolate
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Martinho, Lucas Blattner. "Modélisation numérique des phénomènes de couplage électromagnétique dans les alentours des lignes aériennes de transmission d'énergie." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAT030/document.

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Les phénomènes de couplage électromagnétique entre les lignes aériennes de transmission d'énergie et des structures voisines sont inévitables, surtout dans les zones densément peuplées. Les effets indésirables découlants de cette proximité sont variés, allant de l'établissement des tensions dangereuses à l'apparition de phénomènes de corrosion dus au courant alternatif. L'étude de cette classe de problèmes est nécessaire pour assurer la sécurité dans les alentours de la zone d'interaction et aussi pour préserver l'intégrité des équipements et des dispositifs présents. Cependant, la modélisatio
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39

Wan, Jie-Jyun, and 萬倢君. "Optimal Sensor Placement for Conductor Temperature Estimation of Overhead Extra-High Voltage Power Transmission Lines." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/00965799148018975076.

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碩士<br>國立臺灣大學<br>生物產業機電工程學研究所<br>102<br>Dynamic thermal rating (DTR) technique is an effective and proper method to manage transmission lines in power system. Dynamic thermal rating utilizes on-line thermal sensors to monitor the operating temperature of overhead transmission lines, and calculates the ampacity margin of the transmission lines. The power transmission efficiency could be improved while under the safe condition. However, deploying a large number of thermal sensors may not be a viable option, because of high equipment costs and increasing the structural complexity of the power grid
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"A theoretical and experimental investigation into fire induced flashover of high voltage transmission lines." Thesis, 2005. http://hdl.handle.net/10413/2930.

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This thesis documents a research study of High Voltage transmission line faults induced by fire. Conductor to conductor and conductor to ground flashovers have been experienced by electricity utilities around the world under conditions of veld and sugar cane fires. These types of faults are unpredictable and negatively impact line reliability and quality of supply. This is a crucial problem when the revenue of the industry is sensitive to voltage dips. Electricity utilities have taken a preventative approach, like clearing vegetation from the line servitude in order to decrease the frequency o
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Ramli, Khairun N., Raed A. Abd-Alhameed, Hmeda I. Hraga, D. T. W. Liang, and Peter S. Excell. "Electromagnetic Field Interaction Between Overhead High Voltage Power Transmission Line and Buried Utility Pipeline." 2011. http://hdl.handle.net/10454/5468.

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yes<br>This work presents the development of a new approach of modelling the source excitation and the penetration of structures by continuous propagating electromagnetic (EM) plane waves. The technique incorporates the solution of time-dependent Maxwell¿s equations and the initial value problem as the structures are illuminated by the plane waves. The propagation of waves from source excitation is simulated by solving a finite-difference Maxwell's equation in the time domain. Subgridding method is used to condense the lattice at the point of interest locally for observing field distribution i
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42

Evert, Cecil Richard. "The detection of fires under high voltage transmission lines." Thesis, 2003. http://hdl.handle.net/10413/4265.

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Fires generate heat and propel burning material into the air above and around the core of the fire. Fires under power lines reduce the breakdown strength of the air insulation due to the influence the heat and particles have on the electric field surrounding the conductors. The result can be flashovers and undesirable power supply interruptions in the electrical transmission network with a considerable impact on Eskom's 275 kV and 400 kV MTS (main transmission system) networks. Eskom typically experiences a loss in sales, a reduction in the quality of the power supplied to consumers and
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43

Nicolae, Dan Valentin. "Non-conventional methods for energy extraction from high voltage transmission lines." Thesis, 2004. http://hdl.handle.net/10352/143.

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Thesis (D. Tech. Electrical engineering) --Vaal University of Technology<br>A comprehensive study upon "Non-conventional methods for energy extraction from the high voltage transmission lines" was addressed in this thesis. As defined in this study, a non-conventional method to extract energy is one that does not touch the conductors of the line. The theoretical framework which originated in the Maxwell's equations was presented as a base for discussion of all the methods and the conditions for the extraction to be possible. This study presents various methods such as capacitive and inductiv
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44

Devadiga, Anurag A. "Lightning Shielding Failure Analysis of Ultra High Voltage Power Transmission Lines." Thesis, 2015. http://etd.iisc.ernet.in/2005/3973.

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In India, the natural energy resources (thermal and hydro) are unevenly distributed and are mostly present in the remote areas and the load centers are distributed across various regions of the country. Therefore high voltage lines have become necessary for the devel-opment of large interconnected power networks and for the reliable and economic transfer of power. The increase in electric power demand due to the electric load growth has lead to the expansion of the transmission systems to ultra high voltage levels. Presently, Ultra High Voltage (UHV) power transmission lines are being built to
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45

Stubbs, Leigh. "Tapping power from high voltage transmission lines using insulated lightning shieldwires and series compensation." Thesis, 2010. http://hdl.handle.net/10539/7498.

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46

"Optimum Corona Ring Design for High Voltage Compact Transmission Lines Using Gaussian Process Model." Master's thesis, 2012. http://hdl.handle.net/2286/R.I.15104.

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abstract: Electric utilities are exploring new technologies to cope up with the in-crease in electricity demand and power transfer capabilities of transmission lines. Compact transmission lines and high phase order systems are few of the techniques which enhance the power transfer capability of transmission lines without requiring any additional right-of-way. This research work investigates the impact of compacting high voltage transmission lines and high phase order systems on the surface electric field of composite insulators, a key factor deciding service performance of insulators. The elec
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47

Wu, Hung-Shuo, and 吳鴻碩. "Optimal Sensor Placement for Extra High Voltage Transmission Lines Based on Dynamic Thermal Rating." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/242gby.

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碩士<br>國立臺灣大學<br>生物產業機電工程學研究所<br>106<br>With the increasing demand for electricity, the load on the long-distance extra high voltage (EHV) power grid is getting heavier. However, the construction of a new power grid is time-consuming and costly. In recent years, dynamic thermal rating (DTR) technology is considered to be able to solve this problem. DTR is an effective tool for assisting smart grids in planning and making decisions. It uses real-time weather information to estimate the conductor temperature and ampacity of the overhead transmission lines. Through these crucial information, trans
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48

Naidoo, Pathmanathan. "Investigations into the upgrading of transmission lines from HVAC to HVDC." Thesis, 2007. http://hdl.handle.net/10413/2224.

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Emanating from the proceedings of CIGRE 2004, a new idea for higher power transmission by recycling and up rating high voltage alternating current transmission lines for high voltage direct current application was presented at the HYDC working group session. To date, there is no known application of the idea. Globally, transmission congestion, power transfer bottlenecks with restricted and limited power transfers and unobtainable servitudes challenge electric power utilities. The literature review shows that since the early sixties, several authors have studied this proposal. However, no appli
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49

Ger, Wei-Jong, and 葛維忠. "Health risk assessment for environmental exposure from high-voltage transmission lines country-wide in Taiwan." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/13999379847529858762.

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碩士<br>國立陽明大學<br>環境衛生研究所<br>91<br>The purpose of this study is to survey the power frequency magnetic field (MF) strength of residences from high-voltage (161/345 KV) transmission lines (HVTL). The evaluate short term (spot, 30/60 min) and 24 h MF as surrogates for 72 h MF exposure in residences. Conduct risk assessment for the extra health risks associated with the children aged 0-14 exposed to MF in Taiwan. A total of 80 residences within 70 m of the HVTL were sampled in Hsichuh. The residential magnetic fields were assessed, using EMDEX II at children’s bedroom. The sampling time
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50

Ntshangase, Zola. "A study of fire-induced air-gap voltage breakdown characteristics under HVDC conditions." Thesis, 2012. http://hdl.handle.net/10413/8300.

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This dissertation investigates the role that is played by high temperatures of air gaps on the breakdown voltage levels under DC positive and negative polarity applied voltages. Due to past experience of AC transmission lines tripping as a result of sugar-cane fires that occur under these lines during cultivation seasons, this study was initiated to investigate this effect under DC applied voltages. Results were obtained from laboratory work conducted and these were closely analysed to understand the behaviour of air gaps under these conditions. A 17mm2 square-cut brass rodrod electrode config
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