<?xml version="1.0" encoding="utf-8"?>
<export-example>
  <doc>
    <id>5658</id>
    <completedYear/>
    <publishedYear>2023</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>7</pageNumber>
    <edition/>
    <issue/>
    <volume/>
    <type>conferenceobject</type>
    <publisherName>Institution of Engineering &amp; Technology</publisherName>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">An FEM simulation model of oil-pressboard insulating systems for HVDC transformers</title>
    <abstract language="eng">In this contribution, a simulation model for the description of the nonlinear dielectric behaviour of an insulation system composed of mineral oil and oil-impregnated pressboard is presented. The model was verified by comparing the simulation results with electric field and current measurements. At the outset, the ideal case, where a homogeneous initial charge carrier distribution according to the definition of ohmic conductivity is present, is analysed to establish the preliminary foundations pertaining to a typical measurement. Following that, the influence of distinct charge carriers on the measured quantities are investigated by altering their parametrisations. In contrast to the ideal case, a real measurement reveals a current trend, that can be explained by an excess amount of initial charge carriers related to the oil-impregnated pressboard layers. Potential possibilities to the origin of the surplus are discussed. Furthermore, it is shown that the dissociable and intrinsic charge carriers alone can reconstruct the measured quantities in terms of the transient behaviour. This points out that, for the field strength studied here ( E ≤ 1 kV/mm ), the charging of the highly resistive pressboard barriers is dominated by the dissociation of charge carriers in the oil gaps.</abstract>
    <parentTitle language="eng">23rd International Symposium on High Voltage Engineering (ISH 2023)</parentTitle>
    <identifier type="url">https://doi.org/10.1049/icp.2024.0488</identifier>
    <enrichment key="opus.source">publish</enrichment>
    <author>Deniz Targitay</author>
    <author>Lisa Roth</author>
    <author>Markus H. Zink</author>
    <author>Andreas Küchler</author>
    <author>Markus Bier</author>
    <author>Maja Kobus</author>
    <author>Michael Geißler</author>
    <author>Balz Schlittler</author>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Mineral oil</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Oil-impregnated pressboard</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Poisson-Nernst-Planck theory</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Ion drift</value>
    </subject>
    <subject>
      <language>eng</language>
      <type>uncontrolled</type>
      <value>Electric current</value>
    </subject>
    <collection role="institutes" number="fang">Fakultät für angewandte Natur- und Geisteswissenschaften</collection>
    <collection role="institutes" number="ieht">Institut für Energie- und Hochspannungstechnik (IEHT)</collection>
    <thesisPublisher>Technische Hochschule Würzburg-Schweinfurt</thesisPublisher>
  </doc>
</export-example>
