Optimiranje izolacije kondenzatorskog tipa od uljem impregniranog papira

doctoral thesis

• Title (english): Optimization of condenser type insulation system made of oil impregnated paper
• Author: Dalibor Filipović-Grčić
• Mentor: Željko Štih (mentor)
• Mentor: Miroslav Poljak (komentor)
• Committee member: Josip Butorac (predsjednik povjerenstva)
• Committee member: Ivo Uglešić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Electrical Engineering and Computing; Zagreb
• Defense date and country: 2010-10-15, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Electrical Engineering
• Universal decimal classification (UDC): 621.3 - Electrical engineering

Abstract

U radu su analizirane mogućnosti optimiranja izolacije kondenzatorskog tipa od uljem impregniranog papira. Pokazalo se kako su kritična mjesta unutar uljno-papirne izolacije rubovi kondenzatorskih obloga na kojima se javljaju jaka lokalna električna polja. Jakost polja na rubu je novi kriterij korišten za dimenzioniranje izolacije umjesto starog koji uzima u obzir dozvoljena radijalna naprezanja. Novi kriterij temelji se na rezultatima numeričkih proračuna električnog polja i mjerenja parcijalnih izbijanja na modelima uljno-papirne izolacije. Određena je funkcionalna ovisnost polja na rubu obloge o geometrijskim parametrima i primijenjenom naponu. Detaljno su istraženi utjecaji promjene geometrijskih parametara obloga mjernih transformatora na raspodjele električnog polja i potencijala. Izvedeni su izrazi za izračun optimalnih radijusa obloga koji osiguravaju idealnu raspodjelu napona. Razvijen je program koji optimira parametre obloga mjernih transformatora. Istražena je mogućnost primjene genetskog algoritma na optimiranje duljina obloga mjernih transformatora te na izbor ulaznih podataka proračuna parametara obloga provodnika. Uspješno su provedene eksperimentalne verifikacije dimenzioniranja izolacijskih sustava kondenzatorskog tipa.

Abstract (english)

The possibilities for optimization of the condenser type insulation system made of oil impregnated paper were analyzed. It has been shown that the critical locations within oil-paper insulation are
capacitive shield edges, due to high local electric fields. Field strength at the edge of the shield is a new criterion used for insulation design instead of taking into account the permissible radial
stresses. The new criterion is based on the results of numerical calculation of electric field and partial discharge measurements on oil-paper insulation models. Analytical expression for field at the
edge of the shield, as function of geometrical parameters and the applied voltage, was derived. Influences of geometric parameters of capacitive shields on voltage and electric field distributions were
closely investigated. The expressions for calculation of the optimal radius of shields, that provide an ideal voltage distribution, were derived. The program that optimizes the parameters of instrument
transformers capacitive shields was developed. The possibilities of genetic algorithm application in optimization tasks, such as determination of optimal shield lengths and selection of input data for
calculation of bushing shields parameters, were investigated. The experimental verifications of condenser type insulation systems design were successfully performed.

• Keywords: uljno-papirna izolacija; optimizacija; kondenzatorsko tijelo; obloge; mjerni transformator; provodnik; parcijalna izbijanja; numerièki proraèun; dielektrièka naprezanja; genetski algoritam
• Keywords (english): oil-paper insulation; optimization; condenser body; shields; instrument transformer; bushing; partial discharges; numerical calculation; dielectric stresses; genetic algorithm
• Language: croatian
• URN:NBN: urn:nbn:hr:168:034018
• Promotion: 2010
• 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: ii, 141 str. : graf. prikazi
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-03-20 11:24:42