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Modeling and OpenFOAM simulation of streamers in transformer oil
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Modellering och OpenFOAM-simulering av streamers i transformatorolja (Swedish)
Abstract [en]

Electric breakdown in power transformers is preceded by pre-breakdown events such as streamers. The understanding of these phenomena is important in order to optimize liquid insulation systems. Earlier works have derived a model that describes streamers in transformer oil and utilized a finite element method to produce numerical solutions. This research investigates the consequences of changing the numerical method to a finite volume-based solver implemented in OpenFOAM. Using a standardized needle-sphere geometry, a number of oil and voltage combinations were simulated, and the results are for the most part similar to those produced by the previous method. In cases with differing results the change is attributed to the more stable numerical performance of the OpenFOAM solver. A proof of concept for the extension of the simulation from a two-dimensional axial symmetry to three dimensions is also presented.

Abstract [sv]

Elektriska genomslag i högspänningstransformatorer föregås av bildandet av elektriskt ledande kanaler som kallas streamers. En god förståelse av detta fenomen är viktigt vid konstruktionen av oljebaserad elektrisk isolation. Tidigare forskning i ämnet har tagit fram en modell för fortplantningen av streamers. Denna modell har sedan lösts numeriskt av ett beräkningsverktyg baserat på finita elementmetoden. I denna uppsats undersöks konsekvenserna av att byta metod till finita volymsmetoden genom att implementera en lösare i OpenFOAM. En standardiserad nål-sfär-geometri har ställts upp och ett flertal kombinationer av oljor och spänningar har simulerats. De flesta resultaten visar god överensstämmande med tidigare forskning medan resultat som avviker har tillskrivits de goda numeriska egenskaperna hos OpenFOAM-lösaren. En ny typ av simulering har även genomförts där simulationen utökas från en tvådimensionell axisymmetrisk geometri til tre dimensioner.

Place, publisher, year, edition, pages
2012. , 71 p.
Keyword [en]
Computational Physics, High voltage, OpenFOAM, Streamer, Electric insulation, Electrodynamics, Finite Volume Method
Keyword [sv]
Beräkningsfysik, Högspänningsteknik, OpenFOAM, Streamer, Elektrisk isolation, Elektrodynamik, Finita volymsmetoden
National Category
Condensed Matter Physics Organic Chemistry Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:liu:diva-80932ISRN: LiTH-IFM-EX--12/2696--SEOAI: oai:DiVA.org:liu-80932DiVA: diva2:549378
External cooperation
ABB Corporate Research, Västerås
Subject / course
Technical Physics
Presentation
2012-06-21, 13:12 (Swedish)
Uppsok
Physics, Chemistry, Mathematics
Supervisors
Examiners
Available from: 2012-09-04 Created: 2012-09-04 Last updated: 2013-08-14Bibliographically approved

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Condensed Matter PhysicsOrganic ChemistryElectrical Engineering, Electronic Engineering, Information Engineering

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