Overvoltage Analysis of Transmission Towers Considering the Influence of Tower-Footing Impedance

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dc.contributor.authorJusto de Araujo, Anderson Ricardo [UNESP]
dc.contributor.authorSeixas, Claudiner Mendes de [UNESP]
dc.contributor.authorKurokawa, Sergio [UNESP]
dc.contributor.authorKordi, Behzad
dc.contributor.authorIEEE
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionFed Inst Sao Paulo IFSP
dc.contributor.institutionUniv Manitoba
dc.date.accessioned2018-11-26T17:48:40Z
dc.date.available2018-11-26T17:48:40Z
dc.date.issued2017-01-01
dc.description.abstractLightning is one of the main causes of outages due to backflashover mechanism in power systems. In this context, the tower-footing impedance presents a key role in the overvoltages caused by this phenomenon. Tower-footing impedance is traditionally modelled as a pure resistance, which is a good approximation, at low frequencies. However, the inductance and resistance of the tower-footing impedance strongly depend on the frequency at higher frequencies of the spectrum that is covered by lightning strokes. As such, their frequency dependence must be considered for accurate calculation of transient responses. Using the Vector Fitting technique, the admittance of grounding electrode buried in soil is represented by a lumped parameter circuit. The circuit model can be connected to transient transmission line models which enables the calculation of the voltages at the cross-arms of the tower. This paper shows the influence of tower-footing impedance of vertical electrodes on the overvoltage caused by a lightning striking at the tower top. The analysis will show how the soil characteristics and geometrical parameters affect the overvoltages at a typical transmission tower.en
dc.description.affiliationSao Paulo State Univ UNESP, Dept Elect Engn, Ilha Solteira, Brazil
dc.description.affiliationFed Inst Sao Paulo IFSP, Votuporanga, Brazil
dc.description.affiliationUniv Manitoba, Dept Elect & Comp Engn, Winnipeg, MB, Canada
dc.description.affiliationUnespSao Paulo State Univ UNESP, Dept Elect Engn, Ilha Solteira, Brazil
dc.format.extent287-294
dc.identifier.citation2017 International Symposium On Lightning Protection (xiv Sipda). New York: Ieee, p. 287-294, 2017.
dc.identifier.urihttp://hdl.handle.net/11449/163987
dc.identifier.wosWOS:000427288000048
dc.language.isoeng
dc.publisherIeee
dc.relation.ispartof2017 International Symposium On Lightning Protection (xiv Sipda)
dc.rights.accessRightsAcesso aberto
dc.sourceWeb of Science
dc.subjectbackflashovers
dc.subjecttransmission tower
dc.subjecttower-footing impedance
dc.titleOvervoltage Analysis of Transmission Towers Considering the Influence of Tower-Footing Impedanceen
dc.typeTrabalho apresentado em evento
dcterms.licensehttp://www.ieee.org/publications_standards/publications/rights/rights_policies.html
dcterms.rightsHolderIeee

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