Denz, Frank (2014)
Modeling and Simulation of Varistors.
Technische Universität Darmstadt
Dissertation, Erstveröffentlichung
Kurzbeschreibung (Abstract)
This thesis treats various problems that arise in the context of varistors and microvaristors, which are are used for the suppression of transient overvoltages, due to their extraordinary nonlinear electrical conductivity. The present work is mainly motivated by the desire to simulate the behavior of high-voltage surge arresters used for lightning protection on the one hand and of microvaristors as materials for future applications in nonlinear resistive stress control on the other hand.
The analysis of surge arresters requires the numerical calculation of mutually-dependent electric and thermal fields, whereby the principal difficulty resides in the extreme nonlinearity of the electric problem. For this purpose, the electro-quasistatics equation is solved in time domain by means of the finite-element method. The calculation of the thermally stationary state of a surge arrester and the evaluation of an envelope equation model for simulating the heating and cooling behavior of arresters are discussed in more detail.
These simulations depend on sufficiently accurate models that describe the material properties. The estimation of nonlinear conductivity and permittivity of varistor materials is an inherent part of this thesis.
Furthermore, nonlinear capacitance and conductance matrices are introduced. The presented approach is based on an equivalent circuit model. Its parameters are determined from field-simulation results.
| Typ des Eintrags: | Dissertation | ||||
|---|---|---|---|---|---|
| Erschienen: | 2014 | ||||
| Autor(en): | Denz, Frank | ||||
| Art des Eintrags: | Erstveröffentlichung | ||||
| Titel: | Modeling and Simulation of Varistors | ||||
| Sprache: | Englisch | ||||
| Referenten: | Weiland, Prof. Thomas ; Hinrichsen, Prof. Volker | ||||
| Publikationsjahr: | Oktober 2014 | ||||
| Ort: | Darmstadt | ||||
| Datum der mündlichen Prüfung: | 8 September 2014 | ||||
| URL / URN: | http://tuprints.ulb.tu-darmstadt.de/4197 | ||||
| Kurzbeschreibung (Abstract): | This thesis treats various problems that arise in the context of varistors and microvaristors, which are are used for the suppression of transient overvoltages, due to their extraordinary nonlinear electrical conductivity. The present work is mainly motivated by the desire to simulate the behavior of high-voltage surge arresters used for lightning protection on the one hand and of microvaristors as materials for future applications in nonlinear resistive stress control on the other hand. The analysis of surge arresters requires the numerical calculation of mutually-dependent electric and thermal fields, whereby the principal difficulty resides in the extreme nonlinearity of the electric problem. For this purpose, the electro-quasistatics equation is solved in time domain by means of the finite-element method. The calculation of the thermally stationary state of a surge arrester and the evaluation of an envelope equation model for simulating the heating and cooling behavior of arresters are discussed in more detail. These simulations depend on sufficiently accurate models that describe the material properties. The estimation of nonlinear conductivity and permittivity of varistor materials is an inherent part of this thesis. Furthermore, nonlinear capacitance and conductance matrices are introduced. The presented approach is based on an equivalent circuit model. Its parameters are determined from field-simulation results. |
||||
| Alternatives oder übersetztes Abstract: |
|
||||
| URN: | urn:nbn:de:tuda-tuprints-41971 | ||||
| Sachgruppe der Dewey Dezimalklassifikatin (DDC): | 600 Technik, Medizin, angewandte Wissenschaften > 620 Ingenieurwissenschaften und Maschinenbau | ||||
| Fachbereich(e)/-gebiet(e): | 18 Fachbereich Elektrotechnik und Informationstechnik 18 Fachbereich Elektrotechnik und Informationstechnik > Institut für Theorie Elektromagnetischer Felder (ab 01.01.2019 umbenannt in Institut für Teilchenbeschleunigung und Theorie Elektromagnetische Felder) |
||||
| Hinterlegungsdatum: | 02 Nov 2014 20:55 | ||||
| Letzte Änderung: | 02 Nov 2014 20:55 | ||||
| PPN: | |||||
| Referenten: | Weiland, Prof. Thomas ; Hinrichsen, Prof. Volker | ||||
| Datum der mündlichen Prüfung / Verteidigung / mdl. Prüfung: | 8 September 2014 | ||||
| Export: | |||||
| Suche nach Titel in: | TUfind oder in Google | ||||
 |
Frage zum Eintrag |
Optionen (nur für Redakteure)
 |
Redaktionelle Details anzeigen |
Drucken
Impressum