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doctoral thesis
Smanjenje broja ispada nadzemnih visokonaponskih vodova uzrokovanih atmosferskim pražnjenjima primjenom odvodnika prenapona.
Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing, 2020. urn:nbn:hr:168:824444
Piliškić, Silvia
University of Zagreb
Faculty of Electrical Engineering and Computing
Department of Energy and Power Systems

Institutional repository: FER Repository

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Piliškić, S. (2020). Smanjenje broja ispada nadzemnih visokonaponskih vodova uzrokovanih atmosferskim pražnjenjima primjenom odvodnika prenapona. (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing. Retrieved from https://urn.nsk.hr/urn:nbn:hr:168:824444

Piliškić, Silvia. "Smanjenje broja ispada nadzemnih visokonaponskih vodova uzrokovanih atmosferskim pražnjenjima primjenom odvodnika prenapona.." Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, 2020. https://urn.nsk.hr/urn:nbn:hr:168:824444

Piliškić, Silvia. "Smanjenje broja ispada nadzemnih visokonaponskih vodova uzrokovanih atmosferskim pražnjenjima primjenom odvodnika prenapona.." Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, 2020. https://urn.nsk.hr/urn:nbn:hr:168:824444

Piliškić, S. (2020). 'Smanjenje broja ispada nadzemnih visokonaponskih vodova uzrokovanih atmosferskim pražnjenjima primjenom odvodnika prenapona.', Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, accessed 26 September 2024, https://urn.nsk.hr/urn:nbn:hr:168:824444

Piliškić S. Smanjenje broja ispada nadzemnih visokonaponskih vodova uzrokovanih atmosferskim pražnjenjima primjenom odvodnika prenapona. [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Electrical Engineering and Computing; 2020 [cited 2024 September 26] Available at: https://urn.nsk.hr/urn:nbn:hr:168:824444

S. Piliškić, "Smanjenje broja ispada nadzemnih visokonaponskih vodova uzrokovanih atmosferskim pražnjenjima primjenom odvodnika prenapona.", Doctoral thesis, University of Zagreb, Faculty of Electrical Engineering and Computing, Zagreb, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:168:824444

Metadata
TitleSmanjenje broja ispada nadzemnih visokonaponskih vodova uzrokovanih atmosferskim pražnjenjima primjenom odvodnika prenapona.
Title (english)Reducing number of high voltage overhead line outages caused by lightning applying line surge arresters.
AuthorSilvia Piliškić
MBZ: 30354239595
MentorIvo Uglešić (mentor)
Committee memberIvo Uglešić (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Electrical Engineering and Computing
(Department of Energy and Power Systems)
Zagreb
Defense date and country2020, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Electrical Engineering
Power Engineering
Universal decimal classification
(UDC)		621.3 - Electrical engineering
Abstract
Atmosferska pražnjenja jedan su od najčešćih uzroka ispada nadzemnih visokonaponskih vodova iz pogona. Metoda za smanjenje broja ispada nadzemnih visokonaponskih vodova uzrokovanih atmosferskim prenaponima primjenom odvodnika prenapona na nadzemnom vodu, predložena u ovom radu, koristi podatke sustava za lociranje atmosferskih pražnjenja. Metoda obuhvaća određivanje rasporeda odvodnika prenapona na stupovima prema relativnoj ugroženosti stupova nadzemnog voda te broja odvodnika na pojedinom stupu prema vjerojatnosti pojave povratnog preskoka ovisno o kombinaciji vrijednosti impedancije uzemljenja stupa i amplitude struje atmosferskog pražnjenja. Razvijen je frekvencijski ovisni model uzemljivača stupa modeliran kao RLC strujni krug uz poznate izraze za parametre R, L i C za zadanu geometriju uzemljivača stupa i za frekvencijski ovisne parametre specifičnog otpora i permitivnosti zemlje. Vrijednosti amplitude i kuta impulsne impedancije uzemljivača izmjerene impulsnim strujama odgovaraju vrijednostima izračunatim korištenjem frekvencijski ovisnog modela impedancije uzemljivača. Na primjeru 110 kV stupa dalekovoda pokazano je da se za tla s visokim specifičnim otporom tla impedancija stupa smanjuje s porastom frekvencije što utječe na smanjenje vjerojatnosti pojave povratnog preskoka kod atmosferskih pražnjenja. U radu je ostvaren znanstveni doprinos: predložena je metoda za odabir i određivanje razmještaja odvodnika prenapona na visokonaponskim nadzemnim vodovima te je razvijen frekvencijski ovisni model impedancije uzemljivača stupova.
Abstract (english)
Lightning is one of the most common cause of the overhead lines’ outages. A method for reducing the number of high voltage overhead line outages caused by lightning applying line surge arresters, which is proposed in this PhD thesis, uses the lightning location system data. The method encompasses the determination of the line surge arresters distribution on the towers along the overhead line according to the relative severity condition of the lightning performance of each tower in relation to the others. The probability of the backflashover occurrence depending on the tower grounding impedance and lightning current amplitude is taken into account. The frequency-dependent model of the tower grounding is developed and modelled as the RLC electrical circuit with the given expressions for RLC for the particular tower grounding geometry and frequency-dependent soil resistivity and permittivity. The frequency-dependent grounding impedance behaviour calculated using the RLC electrical circuit corresponds well with the experimental measurements, in terms of amplitude and phase angle. The simulations of the 110 kV overhead line tower stroke by the lightning have shown that the tower grounding impedance decreases with high frequencies and that the probability of the backflashover on the insulator string is lower when taking into account the frequency dependence of the tower grounding impedance for configurations with high soil resistivity. The scientific contribution in PhD thesis is as follows: the method for selection and distribution of the line surge arresters has been proposed and the model of the frequency-dependent model of the tower grounding impedance has been developed.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:168:824444
Promotion2020
Study programmeTitle: 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)
Catalog URLhttps://lib.fer.hr:8443/cgi-bin/koha/catalogue/detail.pl?biblionumber=51891&searchid=scs_1600432691079
Type of resourceText
Extent185 str. ;
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2020-09-18 12:40:42