Otpornost ovalnih folijskih namota distribucijskih transformatora na kratki spoj

Meško Mekanović, Nina

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doctoral thesis

Otpornost ovalnih folijskih namota distribucijskih transformatora na kratki spoj

Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing, 2022. urn:nbn:hr:168:210345

Meško Mekanović, Nina

University of Zagreb
Faculty of Electrical Engineering and Computing
Department of Electric Machines, Drives and Automation

Cite this document

APA 6th Edition

Meško Mekanović, N. (2022). Otpornost ovalnih folijskih namota distribucijskih transformatora na kratki spoj (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing. Retrieved from https://urn.nsk.hr/urn:nbn:hr:168:210345

MLA 8th Edition

Meško Mekanović, Nina. "Otpornost ovalnih folijskih namota distribucijskih transformatora na kratki spoj." Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, 2022. https://urn.nsk.hr/urn:nbn:hr:168:210345

Chicago 17th Edition

Harvard

Meško Mekanović, N. (2022). 'Otpornost ovalnih folijskih namota distribucijskih transformatora na kratki spoj', Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, accessed 15 January 2025, https://urn.nsk.hr/urn:nbn:hr:168:210345

Vancouver

Meško Mekanović N. Otpornost ovalnih folijskih namota distribucijskih transformatora na kratki spoj [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing; 2022 [cited 2025 January 15] Available at: https://urn.nsk.hr/urn:nbn:hr:168:210345

IEEE

N. Meško Mekanović, "Otpornost ovalnih folijskih namota distribucijskih transformatora na kratki spoj", Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, 2022. Available at: https://urn.nsk.hr/urn:nbn:hr:168:210345

Cite this item: https://urn.nsk.hr/urn:nbn:hr:168:210345

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Metadata

Title	Otpornost ovalnih folijskih namota distribucijskih transformatora na kratki spoj
Title (english)	Short circuit withstand capability of oval foil windings in distribution transformers
Author	Nina Meško Mekanović
Mentor	Damir Žarko (mentor)
Committee member	Zlatko Hanić (predsjednik povjerenstva)
Committee member	Stjepan Stipetić (član povjerenstva)
Committee member	Žarko Janić (član povjerenstva)
Granter	University of Zagreb Faculty of Electrical Engineering and Computing (Department of Electric Machines, Drives and Automation) Zagreb
Defense date and country	2022, Croatia
Scientific / art field, discipline and subdiscipline	TECHNICAL SCIENCES Electrical Engineering Power Engineering
Universal decimal classification (UDC)	621.3 - Electrical engineering
Abstract	Transformator je vrlo važan dio elektroenergetskog sustava pa je samim time jedan od ključnih zahtjeva tijekom projektiranja dimenzioniranje na vanjski kratki spoj kako bi se osigurao nesmetani rad. Budući je kratki spoj jedan od češćih uzroka kvarova transformatora, nužno je imati kriterije čijim bi se zadovoljavanjem u fazi projektiranja transformatora omogućilo da transformator izdrži kratki spoj. Tema otpornosti i dimenzioniranja energetskih transformatora detaljno je obrađena u literaturi, dok za suvremene distribucijske transformatore s ovalnim folijskim namotima i dijamantnim papirom nema dovoljno literature. Upravo je to tema ove disertacije. Ova disertacija bavi se određivanjem numeričkih kriterija za dimenzioniranje ovalnih folijskih namota distribucijskih transformatora na kratki spoj. Objašnjeno je ispitivanje koje transformator mora zadovoljiti zajedno s izrazima za izračun udarne (dinamičke) komponente struje kratkog spoja, kao i uvjeti za prolaznost ispitivanja prema standardu IEC 60076-5. Prolazak ispitivanja transformatora na kratki spoj potvrđuje otpornost transformatora na kratke spojeve u mreži i osigurava nesmetan rad transformatora. Uz analitičke izraze za djelovanje sile na namote u transformatoru, obrađena su i posljedična radijalna naprezanja koja se javljaju tijekom kratkog spoja. Uz naprezanje na vlak i tlak te savijanje, posebna pozornost je dana naprezanju na izvijanje. Napravljeno je opsežno ispitivanje Youngovog modula elastičnosti kompozita čiji rezultati su korišteni za definiranje kriterija za dimenzioniranje transformatora na kratki spoj. Verifikacija samih kriterija napravljena je na 43 transformatora u rasponu snaga 160 1000 kVA koji su ispitani prema standardu IEC 60076-5. Neki od ispitanih transformatora bili su iz redovne proizvodnje dok su neki napravljeni isključivo u svrhu verifikacije novih kriterija.
Abstract (english)	The transformer is an important part of the power system and must be designed to be able to withhold an external short circuit. External short-circuits in the power systems are still one of the most common causes of the transformer malfunction. Therefore, it is crucial to have criteria during the designing phase the fulfillment of which would allow the transformer to withstand a short-circuit. There is a lot of published literature about power transformers and how they can be made short-circuit proof while there is not enough literature for modern distribution transformers with oval foil windings and diamond dotted paper. That is the focus of this dissertation. This dissertation describes the numerical criteria for the oval foil windings designing to be able to withstand short-circuit in the power system. The short-circuit testing procedure together with the expressions for calculating short-circuit current, as well as the conditions for passing the test according to the IEC 60076-5 standard are given. Short-circuit forces and stress in the windings is explained. Along with the analytical expressions for the forces in the windings, the radial stresses that occur during a short circuit are described. In addition to tensile and compressive stress and bending, special attention is paid to buckling stress and Young's modulus of elasticity. The verification of the criteria was done on 43 transformers in the power range 160 1000 kVA that were tested according to the IEC 60076-5 standard.
Keywords
Keywords (english)
Language	croatian
URN:NBN	urn:nbn:hr:168:210345
Promotion	2022
Study programme	Title: Doctoral study programme "Electrical Engineering and Computing" Study programme type: university Study level: postgraduate Academic / professional title: doktor/doktorica znanosti, po-dručje tehničkih znanosti (doktor/doktorica znanosti, po-dručje tehničkih znanosti)
Type of resource	Text
Extent	viii, 84 str. : graf. prikazi ; 30 cm. + CD-ROM.
File origin	Born digital
Access conditions	Closed access
Terms of use
Repository	FER Repository
Created on	2022-11-23 10:33:34