The University of Southampton
University of Southampton Institutional Repository

Dynamics of space charge and electroluminescence modelling in polyethylene

Dynamics of space charge and electroluminescence modelling in polyethylene
Dynamics of space charge and electroluminescence modelling in polyethylene
Space charge has been recognized as an important factor contributing to the electrical failure of the cable insulation. Extensive efforts have been made to investigate space charge dynamics within polymeric insulations under electric stresses. Basic information about space charge has been recognized resorting to modern charge mapping techniques but the underlying mechanisms for charge transport, charge trapping characteristics are not yet well understood. Hence theoretical modelling and numerical simulation are employed to simulate the space charge and provide an insight into the charge distribution in dielectrics. This thesis comprises the quantitative analysis of space charge through numerical modelling and experimental investigations of charge trapping in polymeric insulation materials.

A bipolar charge transport model which involves bipolar charge injection from the electrodes, charge transport with trapping and recombination in the bulk has been developed to simulate the dynamics of space charge in polyethylene. The build-up of space charge in polyethylene under dc electric fields has been modelled. The influence of parameters related to the properties of polyethylene on the formation of space charge has been recognized. Furthermore, this model is introduced to simulate the dynamics of corona charge decay in polyethylene. The formation of charge packets in polyethylene is also investigated using a numerical modelling approach.

A fast pulsed electro-acoustic system along with a data processing program has been developed to investigate the behaviour of space charge in polyethylene under ac voltages. The understanding of space charge under ac stresses has also been simulated using the further developed bipolar charge transport model. Experiments and simulation have also been expanded into understanding electroluminescence, which is an indication of pre-aging of polymers under ac stress.
Zhao, Junwei
b3fc6668-bcfd-4ba3-8c44-809cc7f26727
Zhao, Junwei
b3fc6668-bcfd-4ba3-8c44-809cc7f26727
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Lewin, P.L.
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e

Zhao, Junwei (2012) Dynamics of space charge and electroluminescence modelling in polyethylene. University of Southampton, Electronics and Computer Science, Doctoral Thesis, 162pp.

Record type: Thesis (Doctoral)

Abstract

Space charge has been recognized as an important factor contributing to the electrical failure of the cable insulation. Extensive efforts have been made to investigate space charge dynamics within polymeric insulations under electric stresses. Basic information about space charge has been recognized resorting to modern charge mapping techniques but the underlying mechanisms for charge transport, charge trapping characteristics are not yet well understood. Hence theoretical modelling and numerical simulation are employed to simulate the space charge and provide an insight into the charge distribution in dielectrics. This thesis comprises the quantitative analysis of space charge through numerical modelling and experimental investigations of charge trapping in polymeric insulation materials.

A bipolar charge transport model which involves bipolar charge injection from the electrodes, charge transport with trapping and recombination in the bulk has been developed to simulate the dynamics of space charge in polyethylene. The build-up of space charge in polyethylene under dc electric fields has been modelled. The influence of parameters related to the properties of polyethylene on the formation of space charge has been recognized. Furthermore, this model is introduced to simulate the dynamics of corona charge decay in polyethylene. The formation of charge packets in polyethylene is also investigated using a numerical modelling approach.

A fast pulsed electro-acoustic system along with a data processing program has been developed to investigate the behaviour of space charge in polyethylene under ac voltages. The understanding of space charge under ac stresses has also been simulated using the further developed bipolar charge transport model. Experiments and simulation have also been expanded into understanding electroluminescence, which is an indication of pre-aging of polymers under ac stress.

Text
Junwei_Zhao_-_PhD_Thesis.pdf - Other
Download (4MB)

More information

Published date: April 2012
Organisations: University of Southampton, EEE

Identifiers

Local EPrints ID: 337550
URI: http://eprints.soton.ac.uk/id/eprint/337550
PURE UUID: 756f8ebd-e1b1-4c07-8cec-0c7734a4837e
ORCID for P.L. Lewin: ORCID iD orcid.org/0000-0002-3299-2556

Catalogue record

Date deposited: 29 Jun 2012 14:04
Last modified: 15 Mar 2024 02:43

Export record

Contributors

Author: Junwei Zhao
Thesis advisor: G. Chen
Thesis advisor: P.L. Lewin ORCID iD

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 http://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.

×