Extreme limits in compaction of 110 kV overhead transmission line regarding dielectric stresses

doctoral thesis

• Title (croatian): Krajnje granice u kompaktiranju 110 kV nadzemnog prijenosnog voda s obzirom na dielektrička naprezanja
• Author: Stanislav Vižintin
• Mentor: Ivo Uglešić (mentor)
• Committee member: Zdravko Hebel (predsjednik povjerenstva)
• Committee member: Ivica Pavić (član povjerenstva)
• Committee member: Maks Babuder (član povjerenstva); strani drzavljanin: Nije dostupno
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; (Department of Energy and Power Systems); Zagreb
• Defense date and country: 2011-02-04, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

At the beginning of my Ph. D. thesis, the state-of-the-art technologies are described as used in OL compacting. Physical bases are then discussed for any type of overvoltage phenomena taking place on OLs and principles as well as procedures are given for insulation co-ordination. A special attention is devoted to the deterministic and statistical method. Based on the analysis of the overvoltage conditions experienced in the Slovenian 110 kV network, the insulation level was determined by using the deterministic method. The temporary, switching and lightning overvoltages as well as characteristics of the selected surge arrester were taken into account. An in-depth analysis is made of the lightning characteristics and activity and of the methods used in calculation of the lightning overvoltages causing most of the in-service outages. By using the developed physical model of the compact OL tower equipped with line post composite insulators, standard and non-standard dielectric tests were made at the Institute’s High-voltage Laboratory. Based on the result analysis, the minimal insulation distances were determined. The insulation flashover frequency, resulting from lightning striking into a single-circuit compact OL, was assessed by relying on computer simulations and the statistical method. Different shapes of the OL tower, insulation levels, grounding resistances as well as rated voltages and mounting locations of surge arresters were considered. By analysing the results, the optimal solution was selected.

Abstract (croatian)

Na početku su opisane savremene tehnologije, koje se mogu koristiti kod kompaktiranja vodova. Nakon toga prikazane su fizikalne osnove za sve vrste prenapona, koji se pojavljuju kod nadzemnih vodova. Isto tako objašnjeni su principi i procedure koordinacije izolacije. Posebno su obrađene deterministička i statistička metoda. Na osnovu analize prenapona, koji se pojavljuju u slovenačkom 110 kV sistemu, determinističkim pristupom bio je definiran izolacijski nivo. U obzir su bili uzeti privremeni, sklopni i atmosferski prenaponi, kao i karakteristike odabranih odvodnika prenapona. Urađena je (bila) temeljita analiza karakteristika i aktivnosti udara gromova, a isto tako i metoda za izračune atmosferskih prenapona, koji su inače najčešći uzročnici ispada u pogonu. Korištenjem izrađenog fizičnog modela stuba kompaktiranog voda sa potpornim kompozitnim izolatorima u visokonaponskoj laboratoriji instituta izvedena su standardna i nestandardna dielektrička ispitivanja. Na osnovu rezultata analiza određena su minimalna izolacijska rastojanja. Frekvencija preskoka na izolaciji kod udara gromova u jednosistemski vod izračunavala se pomoću računarskih simulacija i statističke metode. Razmatrao se utjecaj različitih oblika stubova, izolacijskih nivoa, otpora uzemljenja a također i nazivnih napona te lokacija odvodnika. Analizom rezultata ustanovljeno je optimalno rješenje.

• Keywords: overhead line; compacting; lightning; overvoltages; insulation co-ordination; arresters; tests; simulations
• Keywords (croatian): nadzemni vod; kompaktiranje; gromovi; prenaponi; koordinacija izolacije; odvodnici ispitivanja; simulacije
• Language: english
• URN:NBN: urn:nbn:hr:168:143960
• Project: Number: 036-0361590-1578; Title: Udovoljavanje zahtjeva zaštite okoliša u visokonaponskom sustavu; Leader: Ivo Uglešić; Jurisdiction: Croatia; Funder: MZOS; Funding stream: ZP
• 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)
• Catalog URL: http://lib.fer.hr/cgi-bin/koha/opac-detail.pl?biblionumber=34380
• Type of resource: Text
• Extent: 150 str ; 30 cm
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2020-08-21 08:50:36