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Partial discharges in epoxy resin voids and the interpretational possibilities and limitations of Pedersen's model

Teilentladungen in Hohlräumen in Epoxydharz und die Möglichkeiten und des Pedersen-Modells

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Contents

Partial discharges take place, among others, inside voids enclosed in insulations. The partial discharge behaviour of epoxy resin samples is studied with the aid of a recently developed streamer partial discharge model (Pedersen's model) and its relation to the modem Pulse Height Analysis and Phase Resolved Measurement techniques is investigated. Furthermore, some relations based on Pedersen's model are deduced. The advantages and disadvantages of the aforementioned model are analysed. Scanning electron microscope photographs show the nature of the deterioration of the void walls due to the partial discharges. The question whether initiation of the treeing phenomenon leading to breakdown from an enclosed spherical void is possible, is also investigated.

Übersicht

Teilentladungen verursachen eine Alterung der Isolierstoffsysteme. Sie können in Hohlräumen der Isolierstoffe stattfinden. Das Teilentladungsverhalten von Hohlräumen in Epoxydharz wird mit der Hilfe von Pulse Height und Phase Resolve Analysis studiert und mit der Hilfe des Pedersen-Modells analysiert. Einige mathematische Verhältnisse diese Modells werden vorgeschlagen. Die Vorteile und Grenzen dieses Modells werden analysiert. Rastermikroskop-Aufnahmen zeigen die Art der Schädigung der Hohlraumwände. Frage, ob das Phänomen der Bäumchen von einem Hohlraum zu einem Durchschlag der Isolation führen kann, wird nachgegangen.

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Authors and Affiliations

  1. Electric Energy Systems Laboratory, Democritus University of Thrace, Department of Electrical and Computer Engineering, 67100, Xanthi, Greece

    M. G. Danikas & G. Adamidis

Authors
  1. M. G. Danikas
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  2. G. Adamidis
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Additional information

The experimental results were obtained at ABB, Baden/Switzerland. One of the authors is indebted to Dr. L. Niemeyer and Dr. B. Fruth for fruiful discussions.

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Danikas, M.G., Adamidis, G. Partial discharges in epoxy resin voids and the interpretational possibilities and limitations of Pedersen's model. Electrical Engineering 80, 105–110 (1997). https://doi.org/10.1007/BF01245959

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  • DOI: https://doi.org/10.1007/BF01245959

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