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Short term DC breakdown and complex permittivity of Al2O3- and MgO-epoxy nanocomposites

Short term DC breakdown and complex permittivity of Al2O3- and MgO-epoxy nanocomposites
Short term DC breakdown and complex permittivity of Al2O3- and MgO-epoxy nanocomposites
Electrical insulation based on epoxy resin is commonly used in high voltage applications. Examples are transformers, terminations, plugs or connectors. But, it is also used in high voltage applications where energy transportation or distribution is not the main purpose, e.g. in medical and industrial X-ray systems, or radar. This paper addresses the changes in the structure due to the introduction of surface functionalized nanoscale particles, namely magnesium oxide and aluminum oxide. Short term DC breakdown tests were performed alongside dielectric spectroscopy. The BD strength was measured for negative DC ramp voltages. Dielectric properties have been acquired by broadband dielectric spectroscopy. The base polymer is a commercially available bisphenol A epoxy with anhydrite hardener. As filler material magnesium oxide powder was used with an average particle size of 22 nm and alumina filler with 50 nm average diameter. Both particle types were modified with a silane coupling agent, in order to achieve a uniform dispersion of particles in the host material. Neat epoxy samples were used as a reference. Both composites showed remarkable DC breakdown strength for low fillgrades. A possible explanation for this unique behavior is given and the differences between samples filled with aluminum oxide and magnesium oxide are discussed.
978-1-4244-9468-2
1-4
Andritsch, T.
8681e640-e584-424e-a1f1-0d8b713de01c
Kochetov, R.
5647ae09-395a-4845-a4a9-51837a5c9aa0
Morshuis, P.H.F.
59248480-efdb-444e-b3f5-b39a3355315a
Smit, J.J.
21d902fe-6d70-4dff-ad29-3eb8146c0ea5
Andritsch, T.
8681e640-e584-424e-a1f1-0d8b713de01c
Kochetov, R.
5647ae09-395a-4845-a4a9-51837a5c9aa0
Morshuis, P.H.F.
59248480-efdb-444e-b3f5-b39a3355315a
Smit, J.J.
21d902fe-6d70-4dff-ad29-3eb8146c0ea5

Andritsch, T., Kochetov, R., Morshuis, P.H.F. and Smit, J.J. (2010) Short term DC breakdown and complex permittivity of Al2O3- and MgO-epoxy nanocomposites. 2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), United States. 17 - 20 Oct 2010. pp. 1-4 . (doi:10.1109/CEIDP.2010.5723960).

Record type: Conference or Workshop Item (Paper)

Abstract

Electrical insulation based on epoxy resin is commonly used in high voltage applications. Examples are transformers, terminations, plugs or connectors. But, it is also used in high voltage applications where energy transportation or distribution is not the main purpose, e.g. in medical and industrial X-ray systems, or radar. This paper addresses the changes in the structure due to the introduction of surface functionalized nanoscale particles, namely magnesium oxide and aluminum oxide. Short term DC breakdown tests were performed alongside dielectric spectroscopy. The BD strength was measured for negative DC ramp voltages. Dielectric properties have been acquired by broadband dielectric spectroscopy. The base polymer is a commercially available bisphenol A epoxy with anhydrite hardener. As filler material magnesium oxide powder was used with an average particle size of 22 nm and alumina filler with 50 nm average diameter. Both particle types were modified with a silane coupling agent, in order to achieve a uniform dispersion of particles in the host material. Neat epoxy samples were used as a reference. Both composites showed remarkable DC breakdown strength for low fillgrades. A possible explanation for this unique behavior is given and the differences between samples filled with aluminum oxide and magnesium oxide are discussed.

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Published date: October 2010
Venue - Dates: 2010 Annual Report Conference on Electrical Insulation and Dielectric Phenomena (CEIDP), United States, 2010-10-17 - 2010-10-20
Organisations: EEE

Identifiers

Local EPrints ID: 354463
URI: https://eprints.soton.ac.uk/id/eprint/354463
ISBN: 978-1-4244-9468-2
PURE UUID: 3e6fd08b-fd32-4296-bbd0-1ceb7c84795c
ORCID for T. Andritsch: ORCID iD orcid.org/0000-0002-3462-022X

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Date deposited: 30 Jul 2013 11:19
Last modified: 20 Jul 2019 00:38

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