Publication result detail

Dielectric Behaviour of High-Temperature Mica Insulation Exposed to Electrical Stress

LIEDERMANN, K., FRK, M.

Original Title

Dielectric Behaviour of High-Temperature Mica Insulation Exposed to Electrical Stress

English Title

Dielectric Behaviour of High-Temperature Mica Insulation Exposed to Electrical Stress

Type

Paper in proceedings (conference paper)

Original Abstract

The paper deals with dielectric studies of aging phenomena in commercially used high-temperature mica insulations. Insulation samples stressed by electric fields ranging from 10 kV/mm to 16,7 kV/mm were aged for up to 280 hours. The objective of the analysis was to examine whether the electrical breakdown, which is a pronounced localized event, is preceded by changes of bulk material properties – frequency and temperature dependence of the complex permittivity. The measurements carried out so far show the presence of at least one relaxation process and one conduction process. Both mechanisms depend strongly on temperature but they seem to be very little affected by electrical stress. Experimental results are analyzed and their potential implications for material diagnostics are discussed.

English abstract

The paper deals with dielectric studies of aging phenomena in commercially used high-temperature mica insulations. Insulation samples stressed by electric fields ranging from 10 kV/mm to 16,7 kV/mm were aged for up to 280 hours. The objective of the analysis was to examine whether the electrical breakdown, which is a pronounced localized event, is preceded by changes of bulk material properties – frequency and temperature dependence of the complex permittivity. The measurements carried out so far show the presence of at least one relaxation process and one conduction process. Both mechanisms depend strongly on temperature but they seem to be very little affected by electrical stress. Experimental results are analyzed and their potential implications for material diagnostics are discussed.

Key words in English

Dielectric relaxation, ageing, mica composites, thermikanit, temperature effects

Authors

LIEDERMANN, K., FRK, M.

Released

11.11.2004

Publisher

Department of Physics, FEEC, Brno University of Technology

Location

Brno

ISBN

80-7355-024-5

Book

Proceedings of the conference NTF 2004 (New Trends in Physics)

Pages from

68

Pages count

4

URL

technické knihovny

BibTex

@inproceedings{BUT12073,
  author="Karel {Liedermann} and Martin {Frk}",
  title="Dielectric Behaviour of High-Temperature Mica Insulation Exposed to Electrical Stress",
  booktitle="Proceedings of the conference NTF 2004 (New Trends in Physics)",
  year="2004",
  number="1",
  pages="4",
  publisher="Department of Physics, FEEC, Brno University of Technology",
  address="Brno",
  isbn="80-7355-024-5",
  url="technické knihovny"
}