The University of Southampton
University of Southampton Institutional Repository

Measurement and simulation of partial discharges within a spherical cavity in a solid dielectric material

Illias, Hazlee Azil (2011) Measurement and simulation of partial discharges within a spherical cavity in a solid dielectric material University of Southampton, Electronics and Computer Science: EEE, Doctoral Thesis , 236pp.

Record type: Thesis (Doctoral)


For high voltage components, the measurement of partial discharge (PD) is used in the performance assessment of an insulation system. Through modelling the PD process, a
better understanding of the phenomenon may be attained. In this work, a model for a spherical cavity within a homogeneous dielectric material has been developed using
Finite Element Analysis (FEA) software in parallel with MATLAB programming code. The model has been used to study the effect of various applied stresses and cavity
conditions on PD activity and also the electric field and temperature distributions within the cavity.

The experimental measurement of PD activity within a spherical cavity has also been undertaken. The measurements were performed for different amplitudes and frequencies
of the applied voltage, a range of spherical cavity sizes and temperature variation of the material. The obtained results show that PD is strongly influenced by various conditions of the cavity and applied stress. The cycle to cycle behaviour of PD events, discharge phase and magnitude distributions, numbers of PDs per cycle, total charge magnitude per cycle, mean charge magnitude and maximum charge magnitude for each experiment have been obtained and analysed.

The simulation results from the PD model have been compared with the measurement results. It is found that certain model parameters are dependent on the applied stress and
cavity conditions. Parameters that clearly affect PD activity can be readily identifed. These parameters include; the effective charge decay time constant, the cavity surface conductivity, the initial electron generation rate, the inception field, the extinction field
and the temperature decay time constant in the cavity. The infuences of surface charge decay through conduction along the cavity wall and temperature and pressure change in the cavity on PD activity have also been studied

PDF HazleeThesis_EPRINTS.pdf - Other
Download (11MB)

More information

Published date: May 2011
Organisations: University of Southampton, EEE


Local EPrints ID: 194921
PURE UUID: 10071128-4d02-4638-bb3d-7b79871dbf5e

Catalogue record

Date deposited: 12 Aug 2011 14:28
Last modified: 18 Jul 2017 11:26

Export record


Author: Hazlee Azil Illias
Thesis advisor: Guanghui Chen
Thesis advisor: Paul Lewin

University divisions

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 supports OAI 2.0 with a base URL of

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.