master's thesis
Influence of Network Grounding on Single Phase Short Circuit Currents

Željko Tokić (2015)
Josip Juraj Strossmayer University of Osijek
Faculty of Electrical Engineering, Computer Science and Information Technology Osijek
Department of Power Engineering
Chair of Power Plants and Energy Processes
Metadata
TitleUtjecaj uzemljenja zvjezdišta elektroenergetskih mreža na struje jednopolnog kvara
AuthorŽeljko Tokić
Mentor(s)Lajos Jozsa (thesis advisor)
Krešimir Fekete (thesis advisor)
Abstract
Glavni zadatak rada bio je opisati utjecaj uzemljenja zvjezdišta transformatora na struju jednofaznog kvara. Nakon uvodnog poglavlja, opisuje se kratki spoj, njegove fizikalne osnove te vremenski tijek struje kvara u ovisnosti o mjestu nastanka kratkog spoja. Treće poglavlje opisuje proračun kratkog spoja , postupak pretvaranja nesimetričnog sustava u simetrični, čime se olakšava proračun i prikazan je način određivanja nadomjesnih impedancija pojedinih elemenata elektroenergetskog sustava. Kroz četvrto poglavlje opisan je matematički model jednofaznog kvara te prednosti i nedostaci pri različitim tretmanima zvjezdišta. Zadnje poglavlje sastoji se od dva dijela. U prvom dijelu prikazan je ručni proračun struje jednofaznog kvara na sabirnici, a u drugom dijelu izvršena je analiza osjetljivosti jednofaznog kvara u ovisnosti o tretmanu zvjezdišta. Odabir načina uzemljenja ovisi o konkretnoj situaciji za pojedino postrojenje te se moraju promatrati prednosti i nedostaci pojedinih načina uzemljenja.
Keywordsstar point grounding single-phase
Parallel title (English)Influence of Network Grounding on Single Phase Short Circuit Currents
Committee MembersLajos Jozsa (committee chairperson)
Goran Knežević (committee member)
Krešimir Fekete (committee member)
GranterJosip Juraj Strossmayer University of Osijek
Faculty of Electrical Engineering, Computer Science and Information Technology Osijek
Lower level organizational unitsDepartment of Power Engineering
Chair of Power Plants and Energy Processes
PlaceOsijek
StateCroatia
Scientific field, discipline, subdisciplineTECHNICAL SCIENCES
Electrical Engineering
Power Engineering
Study programme typeuniversity
Study levelgraduate
Study programmeGraduate University Study Programme in Electrical Engineering; specializations in: Communications and Informatics, Power Engineering
Study specializationPower Engineering
Academic title abbreviationmag.ing.el.
Genremaster's thesis
Language Croatian
Defense date2015-10-05
Parallel abstract (English)
The main goal of the thesis was to describe the effects of grounded Y connection of the transformer on the short circuit single phase current. After the introduction chapter, the short circuit is described, its physical preferences and the time diagram of the current in correlation with the place of the shortening. Third chapter describes the short circuit calculations, the transformation of a non-symmetrical system to a symmetrical one, which in turn simplifies calculations. A way of determining impedance of elements of the grid system is also shown. Throughout the forth chapter a mathematical model of a single phase short circuit is described, and advantages and disadvantages of different connection types are shown. The last chapter consists of two parts. The first part shows a calculation of single phase short circuit current on the bus bar, and the second part shows the analysis of sensitivity of the short circuit depending on the connection type. The selection of method used to ground a transformer depends of the situation of each individual transformer and advantages and limitations of each must be considered.
Parallel keywords (Croatian)zvjezdiste uzemljenje jednofazni kvar
Resource typetext
Access conditionOpen access
Terms of usehttp://rightsstatements.org/vocab/InC/1.0/
URN:NBNhttps://urn.nsk.hr/urn:nbn:hr:200:964002
CommitterAnka Ovničević