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scientific master's theses
Relejna zaštita srednjenaponskih motora
Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing, 2011. urn:nbn:hr:168:224662
Flajšek, Krunoslav
University of Zagreb
Faculty of Electrical Engineering and Computing
Department of Energy and Power Systems

Cite this document

Flajšek, K. (2011). Relejna zaštita srednjenaponskih motora (Scientific master's theses). Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing. Retrieved from https://urn.nsk.hr/urn:nbn:hr:168:224662

Flajšek, Krunoslav. "Relejna zaštita srednjenaponskih motora." Scientific master's theses, University of Zagreb, Faculty of Electrical Engineering and Computing, 2011. https://urn.nsk.hr/urn:nbn:hr:168:224662

Flajšek, Krunoslav. "Relejna zaštita srednjenaponskih motora." Scientific master's theses, University of Zagreb, Faculty of Electrical Engineering and Computing, 2011. https://urn.nsk.hr/urn:nbn:hr:168:224662

Flajšek, K. (2011). 'Relejna zaštita srednjenaponskih motora', Scientific master's theses, University of Zagreb, Faculty of Electrical Engineering and Computing, accessed 23 March 2025, https://urn.nsk.hr/urn:nbn:hr:168:224662

Flajšek K. Relejna zaštita srednjenaponskih motora [Scientific master's theses]. Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing; 2011 [cited 2025 March 23] Available at: https://urn.nsk.hr/urn:nbn:hr:168:224662

K. Flajšek, "Relejna zaštita srednjenaponskih motora", Scientific master's theses, University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, 2011. Available at: https://urn.nsk.hr/urn:nbn:hr:168:224662

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Metadata
TitleRelejna zaštita srednjenaponskih motora
Title (english)Relay protection of medium voltage motors
AuthorKrunoslav Flajšek
MentorAnte Marušić (mentor)
Committee memberZlatko Maljković (predsjednik povjerenstva)
Committee memberAnte Marušić (član povjerenstva)
Committee memberSrđan Žutobradić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Electrical Engineering and Computing
(Department of Energy and Power Systems)
Zagreb
Defense date and country2011-03-04, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Electrical Engineering
Universal decimal classification
(UDC)		621.3 - Electrical engineering
Abstract
Zbog velikog broja tipova motora, različite veličine i različite primjene, zaštita električnih motora standardizirana je u znatno manjoj mjeri od zaštite drugih strojeva i drugih dijelova elektroenergetskih postrojenja. Prilikom projektiranja veličinu i cijenu sustava relejne zaštite potrebno je uskladiti s potencijalnim opasnostima i mogućim kvarovima, kako bi se postigla maksimalna pogonska raspoloživost i sigurnost uz prihvatljivu cijenu. Analizom podataka prikupljenih istraživanjem pokazano je da se više od 80% kvarova može izbjeći korištenjem točne i efektivne relejne zaštite. Budući da suvremeni uređaji relejne zaštite nude više zaštitnih funkcija, a s porastom broja funkcija raste cijena samih uređaja, dane su preporuke za izbor opsega funkcija zaštite. Velik dio navedenih funkcija koje se koriste u zaštiti sinkronih i asinkronih motora detaljno je opisan u radu te razrađen kroz rješenja koja su implementirana u današnjim uređajima zaštite. Uz detaljan opis dani su i prijedlozi podešenja za različite primjene. Budući da je najveći dio kvarova u motoru direktno ili indirektno povezan s porastom temperature, a upravo je funkcija termičke zaštita primjenom numeričkih uređaja doživjela najveći napredak, u posljednjem poglavlju opisan je algoritam termičke zaštite s modelom prvog reda. Usporedbom termičkog i nadstrujnog modela prikazane su prednosti termičkog modela.
Abstract (english)
Due to the many motor types, different sizes and applications, relay protection of electrical motors is less standardized than protection of other machines and other electrical facilities. During designing, size and cost of protection system should be adjusted with potential hazards and faults, to achieve maximal availability and security with acceptable price. Analysis of collected survey data shows that more than 80% of faults can be avoided using precise and effective relay protection. Since contemporary relay protection devices offer more protection functions, increase of number of protection functions cause increase of device price, there are given recommendations for choose of function scope. Majority of the given functions that are used in synchronous and induction motor protection, is described in details and elaborated through solutions implemented in nowadays protection devices. A detailed description is given with proposed setting for different applications. Since majority of faults in motor dealing directly or indirectly with temperature rise, and thermal protection function with application of numerical devices has experienced largest progress, in the last chapter the first order thermal model algorithm is described. Advantages of thermal model are shown through comparison of thermal and overcurrent model.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:168:224662
Study programmeTitle: Postgraduate master programme in electrical engineering
Study programme type: university
Study level: postgraduate
Academic / professional title: Magistar znanosti elektrotehnike (Magistar znanosti elektrotehnike)
Catalog URLhttp://lib.fer.hr/cgi-bin/koha/opac-detail.pl?biblionumber=34422
Type of resourceText
Extent115 str ; 30 cm
File originBorn digital
Access conditionsClosed access
Terms of useLicence In copyright icon
RepositoryFER Repository
Created on2020-08-24 07:50:14

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