The University of Southampton
University of Southampton Institutional Repository

Space charge behavior of magnesium oxide filled epoxy nanocomposites at different temperatures and electric field strengths

Space charge behavior of magnesium oxide filled epoxy nanocomposites at different temperatures and electric field strengths
Space charge behavior of magnesium oxide filled epoxy nanocomposites at different temperatures and electric field strengths
Space charge accumulation is a phenomenon, which is typical for high voltage dc insulation. It is of special importance for polymers, since they do not possess self-healing properties. Thus, the accumulation of space charges, which is linked to ageing, proved to be a limiting factor for HVDC applications. The focus of this paper is the behavior of epoxy based nanocomposites with magnesium oxide filler material. Nanoscale magnesium oxide has already been shown to decrease the space charge density for high field strengths. Additionally, MgO-nanocomposites showed an increase in the short term dc breakdown strength for low filler concentrations. Base material for all samples is commercially available bisphenol-A epoxy resin. Transmission electron microscopy was performed to validate the particle size and dispersion and showed that MgO has an average particle size of 22 nm. Space Charge profiles were obtained with the PEA-method and compared to neat epoxy. The profiles were taken under dc field strengths between 10 and 18 kV/mm. To see the influence of temperature on the charge distribution, the measurement was performed both at room temperature and at 60°C. The field enhancement factor of both the neat epoxy and the nanocomposite for different field strengths and temperatures has been calculated. It turned out that MgO nanocomposites show overall better space charge behavior at higher field strengths and at higher temperatures, compared to the unfilled epoxy. Both the space charge accumulation and the field enhancement factor are reduced, when going to higher electric field strengths or temperatures. Possible explanations for the observed space charge behavior are given.
978-1-4577-0277-8
136-140
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Kochetov, Roman
9132fe00-0536-4082-a4ce-54253b2e9fe0
Lennon, Barry
f53dd152-e0ce-42be-9008-bc4d1a595321
Morshuis, Peter H.F.
52ee8690-43df-4325-b9df-3b02a8deed87
Smit, Johan J.
2a25b796-b15f-485c-b10d-08a813481c42
Andritsch, Thomas
8681e640-e584-424e-a1f1-0d8b713de01c
Kochetov, Roman
9132fe00-0536-4082-a4ce-54253b2e9fe0
Lennon, Barry
f53dd152-e0ce-42be-9008-bc4d1a595321
Morshuis, Peter H.F.
52ee8690-43df-4325-b9df-3b02a8deed87
Smit, Johan J.
2a25b796-b15f-485c-b10d-08a813481c42

Andritsch, Thomas, Kochetov, Roman, Lennon, Barry, Morshuis, Peter H.F. and Smit, Johan J. (2011) Space charge behavior of magnesium oxide filled epoxy nanocomposites at different temperatures and electric field strengths. 2011 Electrical Insulation Conference (EIC), United States. 05 - 08 Jun 2011. pp. 136-140 . (doi:10.1109/EIC.2011.5996133).

Record type: Conference or Workshop Item (Paper)

Abstract

Space charge accumulation is a phenomenon, which is typical for high voltage dc insulation. It is of special importance for polymers, since they do not possess self-healing properties. Thus, the accumulation of space charges, which is linked to ageing, proved to be a limiting factor for HVDC applications. The focus of this paper is the behavior of epoxy based nanocomposites with magnesium oxide filler material. Nanoscale magnesium oxide has already been shown to decrease the space charge density for high field strengths. Additionally, MgO-nanocomposites showed an increase in the short term dc breakdown strength for low filler concentrations. Base material for all samples is commercially available bisphenol-A epoxy resin. Transmission electron microscopy was performed to validate the particle size and dispersion and showed that MgO has an average particle size of 22 nm. Space Charge profiles were obtained with the PEA-method and compared to neat epoxy. The profiles were taken under dc field strengths between 10 and 18 kV/mm. To see the influence of temperature on the charge distribution, the measurement was performed both at room temperature and at 60°C. The field enhancement factor of both the neat epoxy and the nanocomposite for different field strengths and temperatures has been calculated. It turned out that MgO nanocomposites show overall better space charge behavior at higher field strengths and at higher temperatures, compared to the unfilled epoxy. Both the space charge accumulation and the field enhancement factor are reduced, when going to higher electric field strengths or temperatures. Possible explanations for the observed space charge behavior are given.

Text
eic11_sc.pdf - Accepted Manuscript
Restricted to Registered users only
Download (1MB)
Request a copy

More information

Published date: June 2011
Venue - Dates: 2011 Electrical Insulation Conference (EIC), United States, 2011-06-05 - 2011-06-08
Organisations: EEE

Identifiers

Local EPrints ID: 354473
URI: https://eprints.soton.ac.uk/id/eprint/354473
ISBN: 978-1-4577-0277-8
PURE UUID: f377b0e8-abbd-45dc-aa74-3bb66cb786fe
ORCID for Thomas Andritsch: ORCID iD orcid.org/0000-0002-3462-022X

Catalogue record

Date deposited: 30 Jul 2013 13:25
Last modified: 22 Oct 2019 00:35

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×