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DC Conductivity Measurements of LDPE: Influence of Specimen Preparation Method and Polymer Morphology
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Polymeric Materials.
Materials and Manufacturing Technology, Chalmers University of Technology.
Materials and Manufacturing Technology, Chalmers University of Technology.
ABB AB, Power Technology, Corporate Research, SE-721 78 Västerås.
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2017 (English)In: Proceedings of the biannual nordic symposium on materials, components and diagnostics: Proceedings of the 25th Nordic Insulation Symposium / [ed] Frank Mauseth, Dr. Kari Lahti and Prof.dr. Hans Edin, 2017Conference paper, Published paper (Refereed)
Abstract [en]

DC conductivity measurements are important for gaining fundamental understanding of conduction mechanisms of insulation materials, as well as in the development of HVDC power system components, such as extruded cable systems. In this study, the influence of sample processing on the morphology and DC conductivity of low-density polyethylene (LDPE) has been studied. Direct compression moulding of LDPE pellets is commonly used in research laboratories for obtaining plaque samples, whereas extrusion is an additional commonly used technique for dispersion of particles in nanocomposites prior to the compression moulding process. In this study LDPE plaques have been obtained by either compression moulding directly from pellets, or by extrusion followed by compression moulding. The morphology obtained in the first case consisted of banded spherulites, whereas the latter method yielded a morphology of small axialites. The difference in sample processing had also an impact on the DC conductivity. The DC conductivity at 22 °C and 3.3 kV mm-1  was of the order of 4x10–18  S m-1  for the plaques obtained by extrusion and compression moulding whereas the plaques obtained by direct compression moulding exhibited a conductivity of 1x10–16  S m-1 . In addition, the reproducibility of the performed DC conductivity measurements was also verified in a round robin test performed between the Royal Institute of Technology and Chalmers Technical University.

Place, publisher, year, edition, pages
2017.
National Category
Composite Science and Engineering
Research subject
Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-220360DOI: 10.5324/nordis.v0i25.2378OAI: oai:DiVA.org:kth-220360DiVA, id: diva2:1167646
Conference
25th Nordic Insulation Symposium on Materials, Components and Diagnostics, Västerås, Sweden, June 2017
Projects
Towards an ultra-high voltage DC cable insulation – Adsorption of Charge Carriers in Polyethylene Nanocomposites
Funder
SweGRIDS - Swedish Centre for Smart Grids and Energy Storage, ML8Swedish Energy Agency, ML8
Note

QC 20171219

Available from: 2017-12-19 Created: 2017-12-19 Last updated: 2017-12-19Bibliographically approved

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Publisher's full texthttps://www.ntnu.no/ojs/index.php/nordis/article/view/2378

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