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undergraduate thesis
UKLOPNA STRUJA TRANSFORMATORA
2021. urn:nbn:hr:200:913447
Živković, Dominik
Josip Juraj Strossmayer University of Osijek
Faculty of Electrical Engineering, Computer Science and Information Technology Osijek
Department of Electromechanical Engineering
Chair of Fundamentals of Electrical Engineering and Measurements

Cite this document

Živković, D. (2021). UKLOPNA STRUJA TRANSFORMATORA (Undergraduate 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:200:913447

Živković, Dominik. "UKLOPNA STRUJA TRANSFORMATORA." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, 2021. https://urn.nsk.hr/urn:nbn:hr:200:913447

Živković, Dominik. "UKLOPNA STRUJA TRANSFORMATORA." Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, 2021. https://urn.nsk.hr/urn:nbn:hr:200:913447

Živković, D. (2021). 'UKLOPNA STRUJA TRANSFORMATORA', Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, accessed 26 March 2025, https://urn.nsk.hr/urn:nbn:hr:200:913447

Živković D. UKLOPNA STRUJA TRANSFORMATORA [Undergraduate thesis]. Osijek: Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek; 2021 [cited 2025 March 26] Available at: https://urn.nsk.hr/urn:nbn:hr:200:913447

D. Živković, "UKLOPNA STRUJA TRANSFORMATORA", Undergraduate thesis, Josip Juraj Strossmayer University of Osijek, Faculty of Electrical Engineering, Computer Science and Information Technology Osijek, Osijek, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:200:913447

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Metadata
TitleUKLOPNA STRUJA TRANSFORMATORA
Title (english)TRANSFORMER SWITCHING CURRENT
AuthorDominik Živković
MentorTomislav Barić (mentor)
GranterJosip Juraj Strossmayer University of Osijek
Faculty of Electrical Engineering, Computer Science and Information Technology Osijek
(Department of Electromechanical Engineering)
(Chair of Fundamentals of Electrical Engineering and Measurements)
Osijek
Defense date and country2021-09-24, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Electrical Engineering
Power Engineering
Abstract
U ovome radu razrađen je utjecaj uklopne struje o remanentnom magnetizmu u transformatoru. Opisana je važnost uklopa u određenom trenutku kako ne bi došlo do „lažnog“ djelovanja relejne zaštite. Kod relejne zaštite važno je reći kako uklopna struja nije kvar, već smetnja koja je uzrokovana drugim i petim harmonikom. Navedeno je kako struja magnetiziranja ovisi o količini zasićenja same jezgre te kakav to utjecaj ima po sami transformator. Definiranjem modela transformatora odnosno postavljanjem ekvivalentne sheme, postavljene su jednadžbe za izračun uklopne struje u trofaznim transformatorima ili samo po jednoj fazi transformatora. Prikazano je kako uklopna struja ovisi o magnetskoj indukciji i magnetskom polju odnosno kako oblik petlje histereze ima veze sa zasićenjem jezgre te što to ima za posljedicu. Uža krivulja rezultira većom uklopnom strujom zbog većeg zasićenja jezgre te pojavom viših harmonika. Pojašnjeno je koji su načini ublažavanja struje uklopa te na koji način relejna zaštita ima svoju zaštitu od prepoznavanja kratkog spoja u odnosu na uklopnu struju. Kako su danas sve više zastupljeni energetski pretvarači, posebna pažnja je obraćena na pulsnu širinsku modulaciju. Rezultat ovog rada je prikaz u programu Matlab kako izgleda ta struja u simulacijskom obliku.
Abstract (english)
In this paper, the influence of the remanent magnetism on the inrush current in a transformer is elaborated. The importance of switching on a certain moment in order to avoid "false" action of relay protection is described. With relay protection, it is important to say that the inrush current is not a fault, but a interference caused by the second and fifth harmonics. It is stated that the magnetizing current depends on the amount of saturation of the core itself and what effect it has on the transformer. By defining the model of the transformer, and by setting the equivalent scheme, the equations for calculating the inrsuh current in three-phase transformers or only for one phase of the transformer are set. It is shown how the inrush current depends on the magnetic induction and the magnetic field, and how the shape of the hysteresis loop has to do with the saturation of the core and what this results in. The wider curve results in a higher inrush current due to higher core saturation and the appearance of higher harmonics. It is explained what are the ways to mitigate the inrsuh current and how the relay protection has an integrated precaution against detecting a short circuit in relation to the inrsuh current. As power converters are increasingly represented today, special attention is paid to pulse-width modulation. The result of this work is displayed in the Matlab program of what the inrush current looks like in simulation form.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:200:913447
Study programmeTitle: Undergraduate University Study Programme
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka elektrotehnike)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2021-11-05 16:40:18