Title:
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A model to explain the TSDC spectrum of XLPE insulation in mid voltage cables based on a virtual electrode
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Author:
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Belana Punseti, Juan; Diego Vives, José Antonio; Orrit Prat, Jordi; Mudarra López, Miguel
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Other authors:
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Escola Tècnica Superior d'Enginyeries Industrial i Aeronàutica de Terrassa; Universitat Politècnica de Catalunya. Departament de Física i Enginyeria Nuclear; Universitat Politècnica de Catalunya. DILAB - Laboratori de física dels materials dielèctrics |
Abstract:
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The analysis by TSDC of a large variety of
cables subjected to long annealing times, has resulted in spectra that sometimes show an oscillation of the current peak observed at 99°C. This process has been observed
in some cables only and it is scarcely reproducible. We present an explanation of this behavior based on the formation
of charge packets and some other assumptions:
charge injection occurs mainly from the negative electrode, and chemical components that act as trapping centers are diffused continously from the semiconducting layers
into the bulk during annealing. When the field is applied the negative electrode injects charge that get trapped in
these centers, so that a virtual electrode is formed. The electric field created by this layer results in a decrease of the field in the gap between the injecting and virtual electrodes, preventing new charge injection. On the other hand, during polarization the virtual electrode shifts through the insulation bulk towards the opposite electrode.
This layer that acts as a virtual electrode becomes neutral by means of recombination when it reaches the opposite electrode, so that the electric field in the region between
the electrodes recovers its initial value and the whole process happens again cyclically. This model can explain the
observed TSDC oscillating spectra of annealed samples.
It can also explain why the oscillations can not be observed in most cases. |
Subject(s):
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-Àrees temàtiques de la UPC::Energies::Energia elèctrica::Electricitat -Electrodes -Electric cables -Oscillations -Elèctrodes -Cables elèctrics -Oscil·lacions |
Rights:
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Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/ |
Document type:
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Article - Published version Conference Object |
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