AC and DC Pre-stressed Electrical Trees in LDPE and its Aluminum Oxide Nanocomposites
2016 (English)In: IEEE transactions on dielectrics and electrical insulation, ISSN 1070-9878, E-ISSN 1558-4135, Vol. 23, no 3, 1506-1514 p.Article in journal (Refereed) Published
Resistance of pure low density polyethylene (LDPE) and its aluminum oxide nanocomposites (up to 3.0 wt%) to degradation by electrical treeing under AC stress and DC pre-stress is analyzed. The experiments were carried out on wire-plane electrode specimens before and after exposure to thermal and DC electro-thermal ageing at 80 degrees C. The obtained results showed enhanced resistance of the nanocomposites to electrical tree inception under AC stress and the tree inception voltage (TIV) increased with nanoparticles content. It has been shown that there was an improved partial discharge (PD) resistance in the nanocomposites compared to the unfilled LDPE. The results also showed that the AC TIV in the nanocomposites consistently increased with the ageing and especially the DC electro-thermally aged specimens had about 30% higher the AC TIV as compared to the unaged material. This effect is attributed to significantly reduced mobility of charge carriers in the nanocomposites. The DC pre-stressed electrical trees generated in the investigated materials were of filamentary-branch structure and the branch channels content increases with the addition of nanoparticles. The mean tree number of the DC prestressed electrical trees decreased in the LDPE and its nanocomposites while the mean maximum tree length increased with the ageing treatments. It is postulated that material recrystallization and a very high electric field level on the wire electrode during the DC pre-stressed electrical tree test are the main reasons for the observed effects.
Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers (IEEE), 2016. Vol. 23, no 3, 1506-1514 p.
AC electrical treeing, DC pre-stressed electrical trees, partial discharge, LDPE, aluminum oxide nanocomposites
Composite Science and Engineering
IdentifiersURN: urn:nbn:se:kth:diva-193843DOI: 10.1109/TDEI.2016.005622ISI: 000381510500034ScopusID: 2-s2.0-84982273273OAI: oai:DiVA.org:kth-193843DiVA: diva2:1034505
FunderSwedish Foundation for Strategic Research , EM11-0022Chalmers Energy initiative
QC 201610122016-10-122016-10-112016-10-12Bibliographically approved