The influence of titanium dioxide additive on the short-term DC breakdown strength of polyethylene

M. S Khalil, Peter O Henk, Mogens Henriksen

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Abstract

The effect of the addition of 1% by weight of titanium dioxide fine particles to low-density polyethylene (LDPE) on the short-term DC breakdown strength of the LDPE was investigated using direct and reverse polarity voltages. The samples used were cylinders of both plain and doped materials, with hemispherically tipped cylindrical electrodes completely embedded in the material, with a minimum gap length between the electrode tips of 0.25 mm. All tests were conducted at room temperature. Results indicate that, although the addition of TiO2 reduces the DC breakdown strength of the doped material if compared to the plain material, it significantly improves its DC reverse polarity characteristics. The doped material seems to be insensitive to the DC polarity reversals. The observed beneficial effect of the addition of TiO2 on the DC reverse polarity characteristics is attributed to the role of this additive in modifying the trapping levels in the polymer, and the consequent change in the space charge pattern in the doped material
Original languageEnglish
JournalI E E E International Symposium on Electrical Insulation. Conference Record
Pages (from-to)268-271
ISSN0164-2006
DOIs
Publication statusPublished - 1990
Event1990 IEEE International Symposium on Electrical Insulation - Toronto, Canada
Duration: 3 Jun 19906 Jun 1990

Conference

Conference1990 IEEE International Symposium on Electrical Insulation
Country/TerritoryCanada
CityToronto
Period03/06/199006/06/1990

Bibliographical note

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