Investigation of the stability of short arcs

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dc.contributor.advisorGaunt, C Trevoren_ZA
dc.contributor.authorJojozi, Mbuleloen_ZA
dc.date.accessioned2014-07-31T10:55:33Z
dc.date.available2014-07-31T10:55:33Z
dc.date.issued2002en_ZA
dc.descriptionIncludes bibliographical references.
dc.description.abstractThe research described in this thesis is an investigation of stability of short arcs. It is on fault tolerant medium voltage distribution networks. It serves to describe experimental findings of the investigation of stability of short (1000mm) arcs. The instability of short arcs with high source impedance may be exploited to improve the lightning performance of medium voltage distribution lines. Lightning initiated flashovers on distribution networks do not necessary lead to power follow current. This subject has been the cause for concern to various authors as far back as the 1930 and 1940. But from the literature search that has been done in this thesis there is not enough information about the effect of high source impedance on arc quenching. A thorough literature search has been done to establish work that has been done by these authors. Some work was reported by Darveniza [1], but without details of the dynamic response. Most of the work on arc quenching and electric properties of wood was done by Darveniza [1]. Various developed arc-quenching techniques are highlighted in this document. The arc behaviour is then discussed without going into the details of plasma physics. The general characteristics and dynamics of AC arcs that are discussed include inter alia the voltage versus current (V-I) characteristic, extinction methods under different circuit parameters and re-ignition of arcs as discussed by Cobine [33]. A range of tests were performed in the newly built medium voltage laboratory at the University of Cape Town. Preliminary tests at low voltage (230V) were performed to establish the possible trends of the arc behaviour and from which the measurement and control circuits were established. This involved initiating an arc channel at different voltages up to 40kV in air and along wood surface path.en_ZA
dc.identifier.apacitationJojozi, M. (2002). <i>Investigation of the stability of short arcs</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering. Retrieved from http://hdl.handle.net/11427/5199en_ZA
dc.identifier.chicagocitationJojozi, Mbulelo. <i>"Investigation of the stability of short arcs."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 2002. http://hdl.handle.net/11427/5199en_ZA
dc.identifier.citationJojozi, M. 2002. Investigation of the stability of short arcs. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Jojozi, Mbulelo AB - The research described in this thesis is an investigation of stability of short arcs. It is on fault tolerant medium voltage distribution networks. It serves to describe experimental findings of the investigation of stability of short (1000mm) arcs. The instability of short arcs with high source impedance may be exploited to improve the lightning performance of medium voltage distribution lines. Lightning initiated flashovers on distribution networks do not necessary lead to power follow current. This subject has been the cause for concern to various authors as far back as the 1930 and 1940. But from the literature search that has been done in this thesis there is not enough information about the effect of high source impedance on arc quenching. A thorough literature search has been done to establish work that has been done by these authors. Some work was reported by Darveniza [1], but without details of the dynamic response. Most of the work on arc quenching and electric properties of wood was done by Darveniza [1]. Various developed arc-quenching techniques are highlighted in this document. The arc behaviour is then discussed without going into the details of plasma physics. The general characteristics and dynamics of AC arcs that are discussed include inter alia the voltage versus current (V-I) characteristic, extinction methods under different circuit parameters and re-ignition of arcs as discussed by Cobine [33]. A range of tests were performed in the newly built medium voltage laboratory at the University of Cape Town. Preliminary tests at low voltage (230V) were performed to establish the possible trends of the arc behaviour and from which the measurement and control circuits were established. This involved initiating an arc channel at different voltages up to 40kV in air and along wood surface path. DA - 2002 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2002 T1 - Investigation of the stability of short arcs TI - Investigation of the stability of short arcs UR - http://hdl.handle.net/11427/5199 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/5199
dc.identifier.vancouvercitationJojozi M. Investigation of the stability of short arcs. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Electrical Engineering, 2002 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/5199en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Electrical Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherElectrical Engineeringen_ZA
dc.titleInvestigation of the stability of short arcsen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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