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

Measurement and simulation of partial discharges within a spherical cavity in a solid dielectric material
Measurement and simulation of partial discharges within a spherical cavity in a solid dielectric material
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 identified. 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 influences 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.
Illias, Hazlee Azil
796ffe4e-32b5-4bb0-8699-52e4ccce1925
Illias, Hazlee Azil
796ffe4e-32b5-4bb0-8699-52e4ccce1925
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Lewin, Paul L.
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e

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)

Abstract

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 identified. 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 influences 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.

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More information

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

Identifiers

Local EPrints ID: 194921
URI: http://eprints.soton.ac.uk/id/eprint/194921
PURE UUID: 10071128-4d02-4638-bb3d-7b79871dbf5e
ORCID for Paul L. Lewin: ORCID iD orcid.org/0000-0002-3299-2556

Catalogue record

Date deposited: 12 Aug 2011 14:28
Last modified: 15 Mar 2024 02:43

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Contributors

Author: Hazlee Azil Illias
Thesis advisor: G. Chen
Thesis advisor: Paul L. Lewin ORCID iD

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