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master's thesis
Štićenje energetskih transformatora s dijeljenim otpornikom za maloomsko uzemljenje
2018. urn:nbn:hr:200:610226
Šarić, Marko
Josip Juraj Strossmayer University of Osijek
Faculty of Electrical Engineering, Computer Science and Information Technology Osijek
Department of Power Engineering
Chair of Power Systems and Substations

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Šarić, M. (2018). Štićenje energetskih transformatora s dijeljenim otpornikom za maloomsko uzemljenje (Master's thesis). Osijek: Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek. Retrieved from https://urn.nsk.hr/urn:nbn:hr:200:610226

Šarić, Marko. "Štićenje energetskih transformatora s dijeljenim otpornikom za maloomsko uzemljenje." Master's thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, 2018. https://urn.nsk.hr/urn:nbn:hr:200:610226

Šarić, Marko. "Štićenje energetskih transformatora s dijeljenim otpornikom za maloomsko uzemljenje." Master's thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, 2018. https://urn.nsk.hr/urn:nbn:hr:200:610226

Šarić, M. (2018). 'Štićenje energetskih transformatora s dijeljenim otpornikom za maloomsko uzemljenje', Master's thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, accessed 18 April 2024, https://urn.nsk.hr/urn:nbn:hr:200:610226

Šarić M. Štićenje energetskih transformatora s dijeljenim otpornikom za maloomsko uzemljenje [Master's thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek; 2018 [cited 2024 April 18] Available at: https://urn.nsk.hr/urn:nbn:hr:200:610226

M. Šarić, "Štićenje energetskih transformatora s dijeljenim otpornikom za maloomsko uzemljenje", Master's thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, Osijek, 2018. Available at: https://urn.nsk.hr/urn:nbn:hr:200:610226

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Metadata
TitleŠtićenje energetskih transformatora s dijeljenim otpornikom za maloomsko uzemljenje
Title (english)Protection of power transformers with a common grounding resistor for a low resistance grounded systems
AuthorMarko Šarić
MentorPredrag Marić (mentor)
Committee memberPredrag Marić (predsjednik povjerenstva)
Committee memberSrete Nikolovski (član povjerenstva)
Committee memberDino Masle (član povjerenstva)
GranterJosip Juraj Strossmayer University of Osijek
Faculty of Electrical Engineering, Computer Science and Information Technology Osijek
(Department of Power Engineering)
(Chair of Power Systems and Substations)
Osijek
Defense date and country2018-10-03, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Electrical Engineering
Power Engineering
Abstract
U ovom radu opisana su pogonska stanja energetskog transformatora koja utječu na njegov rad i na rad numeričkih zaštitnih uređaja. Dan je pregled postavki primarnih i sekundarnih zaštita transformatora koje su ispitane na unutarnje i vanjske kvarove. Prikazan je način modeliranja regulatora napona i njegovo korištenje. Izvedeno je snimanje uklopa transformatora radi analiziranja udarne struje magnetiziranja u samostalnom pogonu i paralelnom pogonu uz pojavu simpatetske struje magnetiziranja. Prikazani su valni oblici koji dokazuju pojavu udarnih struja magnetiziranja. Nadalje, predstavljena je simulacija analize prilika jednofaznog kratkog spoja u 110 kV, 220 kV i 400kV mreži koji za posljedicu rezultira tokom struje kroz neutralne točke 35 kV strane dva paralelno spojena energetska transformatora. Te cirkulacijske struje mogu imati negativan učinak na selektivnost zaštite sustava. U radu su dani prijedlozi rješenja neselektivne prorade zaštite u numeričkim relejima.
Abstract (english)
In this paper different transformer operating states that affect and interfere with his and the work of numerical relays are described. Also review of the settings for primary and secondary transformer protection and its testing for internal and external faults has been done. Modeling of the transformer voltage regulator and its testing is shown. The simulation of transformer switch-on has been done for the sake of analyzing the inrush current during stand-alone and parallel operation states in which sympathetic inrush occurs. The wave forms that prove the presence of inrush current are shown. Further the analysis of single phase to ground faults in 110, 220 and 400 kV network which as a result cause a circulating current through neutral points of 35 kV of two parallel power transformers. Those circulating currents can have a negative effect on the selectivity of system protection. Suggestions for the solution of non-selective tripping of relays are given.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:200:610226
Study programmeTitle: Graduate University Study Programme in Electrical Engineering; specializations in: Communications and Informatics, Power Engineering
Course: Communications and Informatics
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka elektrotehnike (magistar/magistra inženjer/inženjerka elektrotehnike)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2018-10-19 09:40:27