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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Bessede, J.L. Elkoun, S. Stochmil, C. Etienne, S. |
| Copyright Year | 2000 |
| Description | Author affiliation: ARC, Alstom, Villeurbanne, France (Bessede, J.L.) |
| Abstract | This paper relates to the study of the dielectric behavior of polymer-based insulating materials used in high voltage equipment. The materials tested are microheterogeneous, basically made out of a semicrystalline polymeric matrix (polytetrafluoroethylene) with mineral particles (calcium fluoride) dispersed in it. The dielectric properties are determined in a wide frequency (or time) range by a combination of two techniques: the short time response is assessed by measuring the complex permittivity in the frequency domain (20 Hz-1 MHz), and the long term response is studied by measuring the polarization current in the time domain (1s-600s) thus covering more than 8 decades in frequency or time. The modelling used to describe microheterogeneous dielectrics is shown to fit the experimental data. However, exposure to moisture is shown to induce strong relaxational effects. These effects vanish in a reversible way by drying treatment (i.e. removal of water molecules). These additional relaxations are discussed in term of conductivity effects occurring at the interface matrix-filler particles. |
| Starting Page | 772 |
| Ending Page | 775 |
| File Size | 326968 |
| Page Count | 4 |
| File Format | |
| ISBN | 0780364139 |
| DOI | 10.1109/CEIDP.2000.884072 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2000-10-15 |
| Publisher Place | Canada |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Dielectrics and electrical insulation Composite materials Dielectric materials Polymers Current measurement Dielectric measurements Permittivity measurement Frequency measurement Time measurement Plastic insulation |
| Content Type | Text |
| Resource Type | Article |
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