Change search
ReferencesLink to record
Permanent link

Direct link
AC and DC Pre-stressed Electrical Trees in LDPE and its Aluminum Oxide Nanocomposites
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
Show others and affiliations
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
Abstract [en]

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.
Keyword [en]
AC electrical treeing, DC pre-stressed electrical trees, partial discharge, LDPE, aluminum oxide nanocomposites
National Category
Composite Science and Engineering
URN: urn:nbn:se:kth:diva-193843DOI: 10.1109/TDEI.2016.005622ISI: 000381510500034ScopusID: 2-s2.0-84982273273OAI: diva2:1034505
Swedish Foundation for Strategic Research , EM11-0022Chalmers Energy initiative

QC 20161012

Available from: 2016-10-12 Created: 2016-10-11 Last updated: 2016-10-12Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Liu, DongmingGedde, Ulf W.
By organisation
Fibre and Polymer Technology
In the same journal
IEEE transactions on dielectrics and electrical insulation
Composite Science and Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

ReferencesLink to record
Permanent link

Direct link