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Dissertations / Theses on the topic 'Impulse breakdown of gases'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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1

Wilson, Mark Peter. "Impulse breakdown of liquid-solid interfaces." Thesis, University of Strathclyde, 2011. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=15975.

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2

Al-Kindi, F. J. "A model for impulse breakdown of SF6Ì²." Thesis, University of Strathclyde, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382317.

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3

Gehman, Victor H. "Impulse electrical breakdown of high-purity water." Diss., This resource online, 1995. http://scholar.lib.vt.edu/theses/available/etd-06062008-162624/.

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4

Xiang, Jing. "Pre-breakdown and breakdown study of transformer oil under DC and impulse voltages." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/prebreakdown-and-breakdown-study-of-transformer-oil-under-dc-and-impulse-voltages(f6dd1d8c-8336-4015-baa5-40928e87330f).html.

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Streamer characteristics, breakdown strengths and gassing behaviour of insulating liquids under electric stresses are taken into account for a reliable design and safe operation of the transformer. Ester liquids which are biodegradable and have high fire point have been widely used in distribution transformers and some power transformers in recent years. It is also interesting to introduce ester liquids into High Voltage Direct Current (HVDC) converter transformers due to the fast development of HVDC transmission lines. Therefore, this thesis aims to investigate the pre-breakdown, breakdown ch

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5

Lu, Wu. "Pre-breakdown and breakdown phenomena of alternative transformer liquids under lightning impulse voltages." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/prebreakdown-and-breakdown-phenomena-of-alternative-transformer-liquids-under-lightning-impulse-voltages(0c3730a7-5df1-4876-bc96-5edb34b4da2f).html.

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In the past decade, alternative liquids such as synthetic ester liquid, natural ester liquid and gas-to-liquid (GTL) based oil are increasingly considered as alternatives to mineral oils in large high voltage power transformers to achieve better environmental, thermal and electrical performances. In regard to applications in power transformers, any alternative liquid needs to have sufficient lightning impulse strength. Lightning impulse strength as basic insulation level is essential for the insulation design of power transformers. In addition, tests under lightning impulse voltages tend to re

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6

Nyberg, John-Levi. "Lightning Impulse Breakdown Tests : Triggered Spark Gap Analysis." Thesis, Umeå universitet, Institutionen för tillämpad fysik och elektronik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-141172.

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This project was made by student from UmeåUniversity and a request from the universityETH in Zürich, Switzerland. In this research project the electrical strengthof different natural gases and mixtures was investigated, and the aim was to finda gas or gas mixture with a natural origin or strongly attaching gases that couldreplace SF6 (Sulfur Hexafluoride). The gases were tested with breakdown experiments,one of those test was called lightning impulse breakdown test. The mainpart of this project was to investigate triggered spark gaps, which could be used inlightning impulse breakdown test. The

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7

Okubo, Hitoshi, Tetsu Shioiri, Mitsutaka Homma, Hiroki Kojima, Ryouki Nishimura, and Keita Aoki. "Enhancement of Breakdown Strength by Microdischarge under Impulse Voltage Applications in Vacuum." IEEE, 2010. http://hdl.handle.net/2237/14534.

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8

Wang, Mengguang. "The electrical breakdown characteristics of oil/paper insulation under fast front impulse voltages." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30108.

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Gas Insulated Substation (GIS) and Gas Insulated Transmission Line (GITL) have found broad application in power system over the last twenty years. Disconnect switch operations in this equipment causes transient voltages with rise times as fast as 5 to 20 nanoseconds and magnitudes as high as 2.5 pu. There is very little information on the effect of these transients on oil/paper insulated equipment connected to the GIS and GITL. There have been reports of transformer and bushing failures which may have been caused by these transients. In the investigation reported in this thesis, the electrica

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9

Qiu, Xiang Qun. "Impulse breakdown characteristics of SF6 and its mixtures in highly non-uniform field gaps." Thesis, University of Strathclyde, 1998. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=21398.

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The work reported in this thesis was undertaken in the Centre for Electrical Power Engineering, Department of Electronic and Electrical Engineering, University of Strathclyde to study the impulse breakdown characteristics of SF₆ and its mixtures in highly non-uniform field gaps. Of particular interest were the effects of space charge, artificial irradiation, different gas mixtures, different additive gases and different wave fronts on the impulse breakdown characteristics. High divergent fields can exist in GIS under certain conditions as, for example, when a needle-like free metallic particle

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10

Rosenlind, Johanna. "The Impulse-Radiating Antenna." Thesis, Karlstad University, Faculty of Technology and Science, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-4527.

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<p>As the interest in intentional electromagnetic interference (IEMI) increases, so does the need of a suitable antenna which endures those demanding conditions. The ultrawideband (UWB) technology provides an elegant way of generating high-voltage UWB pulses which can be used for IEMI. One UWB antenna, invented solely for the purpose of radiating pulses, is the impulse radiating antenna (IRA). In the course of this master thesis work, a suitable geometry of the IRA is suggested, and modelled, for the high-voltage application of 90 kV.</p>

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11

Lipham, Mark Lawrence Kirkici Hulya. "Electrical breakdown studies of partial pressure argon under Khz range pulse voltages." Auburn, Ala., 2010. http://hdl.handle.net/10415/2044.

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12

Holt, Daniel B. "Design, fabrication, and testing of a miniature impulse turbine driven by compressed gas /." Online version of thesis, 2004. http://hdl.handle.net/1850/11793.

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13

Liu, Qiang. "Electrical performance of ester liquids under impulse voltage for application in power transformers." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/electrical-performance-of-ester-liquids-under-impulse-voltage-for-application-in-power-transformers(3702b3a2-ec5f-4674-ab11-1032906e8c0c).html.

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Ester liquids including both natural ester and synthetic ester are being considered as potential alternatives to mineral oil, due to their better environmental performance and for some liquids their higher fire point. Although these liquids have been widely used in distribution and traction transformers, it is still a significant step to adopt ester liquids in high-voltage power transformers because the high cost and severe consequence of a factory test failure and the high level of safety and reliability required in service for these units, tend to lead to a cautious approach to any step chan

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14

Brown, Christopher G. "Laser induced breakdown spectroscopy for detection of organic residues impact of ambient atmosphere and laser parameters." Doctoral diss., University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4860.

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Laser Induced Breakdown Spectroscopy (LIBS) is showing great potential as an atomic analytical technique. With its ability to rapidly analyze all forms of matter, with little-to-no sample preparation, LIBS has many advantages over conventional atomic emission spectroscopy techniques. With the maturation of the technologies that make LIBS possible, there has been a growing movement to implement LIBS in portable analyzers for field applications. In particular, LIBS has long been considered the front-runner in the drive for stand-off detection of trace deposits of explosives. Thus there is a need

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15

Spratt, David James. "Electron loss and excitation in atom-atom collisions." Thesis, Queen's University Belfast, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.287429.

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16

Černá, Svatava. "Vliv atmosféry na laserovou ablaci materiálů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417146.

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This thesis deals with a general overview of laser-induced breakdown spectroscopy - ablation of material and plasma formation when a change of the surrounding environment occurs. The aim is to establish ideal conditions for improving detection, which is difficult for some elements when the measurement takes place in the ambient atmosphere. This is the reason why we change the ambient conditions, the gas (air, helium, argon) and its pressure. Buffer gases (helium, argon) influence the development of the material ablation and quality of generated plasma. That is why we inspect the changes in the

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17

Gürlek, Akif. "Zum Entladungsprozess der Spitze-Spitze-Elektrodenanordnung bei standardisierter und oszillierender Blitzspannung." Universitätsverlag Chemnitz, 2020. https://monarch.qucosa.de/id/qucosa%3A73246.

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Diese Dissertation widmet sich der Erfassung, Identifikation und Beschreibung von Entladungsprozessen, die an Überschlägen bei Blitzspannung auftreten. Es wird ein Messsystem entwickelt, welches die elektrischen und optischen Parameter der Entladungsprozesse an der Spitze-Spitze-Elektrodenanordnung bei standardisierter und oszillierender Blitzspannung mit hoher Empfindlichkeit und Synchronisationsgenauigkeit aufzeichnet. Mithilfe der Strommessungen und der fotografischen Aufzeichnungen von Entladungen können drei Phasen des Durchschlagprozesses identifiziert werden: In der Reihenfolge ihres Au

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18

Tran, Van Top. "Étude de la génération des streamers dans l'huile minérale sous tension impulsionnelle et alternative." Grenoble INPG, 1999. http://www.theses.fr/1999INPG0024.

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L'objectif de cette these est d'etudier la generation des streamers dans l'huile minerale sous tension impulsionnelle et tension alternative avec des conditions de champ largement variees en presence de certaines pollutions (particules et eau). Ce travail apporte une meilleure comprehension de la generation des phenomenes precurseurs du claquage. Les resultats obtenus mettent en evidence l'influence importante de la geometrie et des impuretes (particules, eau) sur la generation des streamers. Un effet remarquable de diminution du champ de generation avec l'augmentation du rayon de courbure de

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19

Pelikán, Luděk. "Měření částečných výbojů u vysokonapěťových kabelů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2018. http://www.nusl.cz/ntk/nusl-376964.

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The main topic of this work is the analysis of the measurement of partial discharge measurements on high voltage cables. The thesis also deals with other measurements, including the measurement of the loss factor and the voltage retention and breakdown test. Part of the text describes the issue of partial discharge, its measurement by galvanic method and methods of elimination of disturbing influences that affect this method in terms of sensitivity and accuracy of the measured values. Thesis also describes the construction of the cables, their marking and the tests carried out on them. There i

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20

Douar, Adnane. "Recherche de matériaux isolants pour la conception d'une nouvelle génération de connecteurs électriques haute tension : influence de la pollution sur les phénomènes de décharges partielles du contournement et de claquage." Thesis, Ecully, Ecole centrale de Lyon, 2014. http://www.theses.fr/2014ECDL0046/document.

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Dans le présent travail, nous abordons une problématique essentielle liée aux accessoires des lignes électriques et plus particulièrement au connecteur à perforation d’isolant (TTDC 45501 FA), commercialisé par la société Sicame située à Arnac-Pompadour (Corrèze). Ce produit permet d’effectuer des dérivations de courant en moyenne tension gainé HTA entre 15 et 25kV. Cependant, il devient nécessaire de concevoir une nouvelle génération de connecteurs capable de fonctionner à une tension de 52 kV en raison de la constante augmentation des besoins en électricité. En réalité, le principal souci co

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21

Sklar, Alexander Gabriel. "Channel Modeling Applied to Robust Automatic Speech Recognition." Scholarly Repository, 2007. http://scholarlyrepository.miami.edu/oa_theses/87.

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In automatic speech recognition systems (ASRs), training is a critical phase to the system?s success. Communication media, either analog (such as analog landline phones) or digital (VoIP) distort the speaker?s speech signal often in very complex ways: linear distortion occurs in all channels, either in the magnitude or phase spectrum. Non-linear but time-invariant distortion will always appear in all real systems. In digital systems we also have network effects which will produce packet losses and delays and repeated packets. Finally, one cannot really assert what path a signal will take, and

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22

Ehlers, Richard. "Determining the switching impulse breakdown voltage over large air gaps with an application to tower-conductor window configurations." Thesis, 1998. http://hdl.handle.net/10539/22712.

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A dissertation submitted to the Faculty of Engineering, University of the Witwatersrand, in fulfilment of the requirements for the degree of Master of Sclenice in Engineering February 20th, 1998<br>All available model used to determine the 50% breakdown voltage for rod-type ami conductor-type gaps subject to switching is impulse wave forms has been applied to a tower-conductor window gap configurution. The results for rod-plane, conductor-piane and tower-conductor window gaps have all been compared and correspond well with practical data. III order to app(v the model, a charge simulati

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23

Tshivhilinge, Mulalo Mercy. "A comparative study of the effect of surface discharge on the impulse breakdown voltage of oil-impregnated pressboard insulation." Thesis, 2015. http://hdl.handle.net/10539/17605.

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The increasing demand for electrical power energy comes with a challenge to design power transformers with optimised dimensions at the same time meeting the energy requirements. The dimension of a power transformer is influence by the insulation system. The use of composite insulation comprising of transformer oil and cellulose (paper and pressboard) is still currently the most economical insulation technology allowing for dimension reduction. Although over the years, there have been developments of alternative insulation systems; the conventional insulation type is still predominant due to va

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24

Li, Ziqin. "The breakdown voltage-time characteristics of SF6 and its mixtures in coaxial cylinder gaps with special reference to steep-fronted impulse voltages with time to chopping down to 100 ns." 1989. http://hdl.handle.net/1993/16867.

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25

Χαραλαμπάκος, Βασίλης. "Ανάπτυξη στοχαστικών μοντέλων για την εξομοίωση της διάσπασης αερίων διακένων σε συνάρτηση με πειραματικές μετρήσεις στο Εργαστήριο Υψηλών Τάσεων". 2004. http://nemertes.lis.upatras.gr/jspui/handle/10889/303.

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Στην παρούσα Διδακτορική Διατριβή παρουσιάζονται τρíα νέα στοχαστικά μοντέλα, τα οποία αναπτύχθηκαν με σκοπό την εξομοίωση της διάδοσης των streamers και των leaders, και της επακόλουθης ηλεκτρικής διάσπασης σε διάκενα αέρα μεγαλύτερα από 5cm υπό ατμοσφαιρική πίεση. Η εξομοίωση της διαδικασίας διάσπασης με την χρήση των στοχαστικών μοντέλων, οδήγησε στην εξαγωγή αποτελεσμάτων που αφορούσαν την τάση διάσπασης U50 καθώς και την τυπική απόκλιση σ, όταν τα διάκενα καταπονούνται από συνεχείς και κρουστικές (1,2/50μsec) τάσεις, θετικής πολικότητας. Εξήχθησαν επίσης αποτελέσματα που αφορούσαν τη μέση

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26

Генкін, Олексій Михайлович. "Еталонні джерела оптичного випромінювання на основі явища електричного пробою у P-N-структурах на карбіді кремнію". Doctoral thesis, 2010. https://ela.kpi.ua/handle/123456789/643.

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