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scientific master's theses
Izbor parametara transformatora za uzemljenje
Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing, 2002. urn:nbn:hr:168:613760
Čorak, Martina
University of Zagreb
Faculty of Electrical Engineering and Computing

Cite this document

Čorak, M. (2002). Izbor parametara transformatora za uzemljenje (Scientific master's theses). Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing. Retrieved from https://urn.nsk.hr/urn:nbn:hr:168:613760

Čorak, Martina. "Izbor parametara transformatora za uzemljenje." Scientific master's theses, University of Zagreb, Faculty of Electrical Engineering and Computing, 2002. https://urn.nsk.hr/urn:nbn:hr:168:613760

Čorak, Martina. "Izbor parametara transformatora za uzemljenje." Scientific master's theses, University of Zagreb, Faculty of Electrical Engineering and Computing, 2002. https://urn.nsk.hr/urn:nbn:hr:168:613760

Čorak, M. (2002). 'Izbor parametara transformatora za uzemljenje', Scientific master's theses, University of Zagreb, Faculty of Electrical Engineering and Computing, accessed 23 April 2024, https://urn.nsk.hr/urn:nbn:hr:168:613760

Čorak M. Izbor parametara transformatora za uzemljenje [Scientific master's theses]. Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing; 2002 [cited 2024 April 23] Available at: https://urn.nsk.hr/urn:nbn:hr:168:613760

M. Čorak, "Izbor parametara transformatora za uzemljenje", Scientific master's theses, University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, 2002. Available at: https://urn.nsk.hr/urn:nbn:hr:168:613760

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Metadata
TitleIzbor parametara transformatora za uzemljenje
AuthorMartina Čorak
MentorZijad Haznadar (mentor)
Committee memberŽeljko Štih (predsjednik povjerenstva)
Committee memberZijad Haznadar (član povjerenstva)
Committee memberZvonimir Valković (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Electrical Engineering and Computing
Zagreb
Defense date and country2002-10-25, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Electrical Engineering
Electromechanical Engineering
Universal decimal classification
(UDC)		621.3 - Electrical engineering
Abstract
U srednjenaponskoj mreži Hrvatske postoji nekoliko naponskih nivoa (10 kV, 20 kV, 30 kV i 35 kV). To otežava nabavku, poskupljuje izradu i zahtjeva veći broj transformatora koje treba držati u pričuvi. Hrvatska elektroprivreda priprema uvođenje jedinstvenog distribucijskog napona 20 kV koji bi zamijenio ostale. Novi su mrežni transformatori zbog toga na srednjenaponskoj strani prespojivi s 10 na 20 kV. Međutim, da bi se iskoristili postojeći transformatori 110/36.75/10.5 kV u spoju YNyn0d5 najekonomičnije rješenje je prespajanje na srednjenaponskoj strani tako da se u spoju YNd5d5 dobije omjer transformacije 110/21.22/10.5 kV. Da bi se 20 kV mreža takvih transformatora mogla uzemljiti potreban je transformator za uzemljenje, kojeg bi bilo dobro standardizirati. U okviru magistarskog rada definiran je transformator za uzemljenje, opisana su njegova svojstva i namjene te je dan pregled izvedbi takvog transformatora ovisno o zahtjevima koji se mogu postaviti. Izveden je analitički proračun rasipne i nulte reaktancije transformatora prilagođen izvedbama transformatora za uzemljenje. Za izoliranu 20 kV mrežu Hrvatske dan je prijedlog parametara transformatora za uzemljenje koji bi bio prikladan za uzemljenje takve mreže te tehnički podaci tog transformatora dobiveni izradom projekta.
Abstract (english)
In the Croatian medium-voltage network there are several voltage levels (10 kV, 20 kV, 30 kV and 35 kV), what makes purchases rather difficult, production costs higher and requires a number of stand-by transformers. Hrvatska Elektroprivreda d.d. (HEP) is making preparations for introduction of a single 20 kV distribution voltage, which will replace the above-mentioned voltages. Therefore the new network transformers are reconnectable from 10 kV to 20 kV. For the existing 110/36.75/10.5 kV transformers in the connection YNyn0d5, the most efficient solution is reconnection on their mediumvoltage side, so that in the connection YNd5d5 the transformation ratio is 110/21.22/10.5 kV. To be able to earth 20 kV network of such transformers it is necessary to have an earthing transformer, and it would be well to standardize it. In this master’s thesis, such an earthing transformer is defined, its characteristics and applications described, and a survey is given of its possible designs in dependence on various requirements. An analytical computation is made of stray and zero reactances adjusted to various designs of the earthing transformer. Parameters of an earthing transformer that would be suitable for the insulated 20 kV network in Croatia are proposed, and technical data obtained during its design process are presented.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:168:613760
Study programmeTitle: Postgraduate master programme in electrical engineering
Study programme type: university
Study level: postgraduate
Academic / professional title: Magistar znanosti elektrotehnike (Magistar znanosti elektrotehnike)
Type of resourceText
File originBorn digital
Access conditionsClosed access
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RepositoryFER Repository
Created on2019-04-30 06:47:48

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