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DC electric field distribution in planar dielectric in the presence of space charge

DC electric field distribution in planar dielectric in the presence of space charge
DC electric field distribution in planar dielectric in the presence of space charge
Electric field in a dielectric material under dc conditions is determined by conductivity of the material. It is well known that the dc conductivity is a function of both temperature and electric field. This is generally not serious issue for a thinner planar sample as the temperature gradient is not great and the applied field is uniform across the sample. However, in the presence of space charge, electric field will be modified. As a result, the conductivity varies with the position, leading to change in electric field distribution. In this paper, we present a numerical simulation of electric field considering the effect of space charge. Space charge distributions were obtained from low density polyethylene (LDPE) and crosslinked polyethylene (XLPE) subjected to high dc voltage. Homocharge was formed in LDPE while heterocharge in XLPE. Electric field obtained from simulation has been compared with that without considering conductivity effect. It has been found that electric field retains its general shape. However, the maximum field has been significantly modified.
Space charge, electric field distribution, dc condition, conductivity, polymeric insulation
1-4244-0750-8
514-517
Xu, Z.
797f8b0e-a035-4cf9-ac3f-99098a3fdb50
Choo, W.
616ef387-7434-4499-ad8c-f83b4b79fcc9
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Xu, Z.
797f8b0e-a035-4cf9-ac3f-99098a3fdb50
Choo, W.
616ef387-7434-4499-ad8c-f83b4b79fcc9
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Xu, Z., Choo, W. and Chen, G. (2007) DC electric field distribution in planar dielectric in the presence of space charge. 2007 IEEE International Conference on Solid Dielectrics, Winchester, United Kingdom. 07 - 12 Jul 2007. pp. 514-517 .

Record type: Conference or Workshop Item (Paper)

Abstract

Electric field in a dielectric material under dc conditions is determined by conductivity of the material. It is well known that the dc conductivity is a function of both temperature and electric field. This is generally not serious issue for a thinner planar sample as the temperature gradient is not great and the applied field is uniform across the sample. However, in the presence of space charge, electric field will be modified. As a result, the conductivity varies with the position, leading to change in electric field distribution. In this paper, we present a numerical simulation of electric field considering the effect of space charge. Space charge distributions were obtained from low density polyethylene (LDPE) and crosslinked polyethylene (XLPE) subjected to high dc voltage. Homocharge was formed in LDPE while heterocharge in XLPE. Electric field obtained from simulation has been compared with that without considering conductivity effect. It has been found that electric field retains its general shape. However, the maximum field has been significantly modified.

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More information

Published date: 2007
Additional Information: Event Dates: 8th -- 13th July 2007
Venue - Dates: 2007 IEEE International Conference on Solid Dielectrics, Winchester, United Kingdom, 2007-07-07 - 2007-07-12
Keywords: Space charge, electric field distribution, dc condition, conductivity, polymeric insulation
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 264320
URI: http://eprints.soton.ac.uk/id/eprint/264320
ISBN: 1-4244-0750-8
PURE UUID: 5fcd2e9c-e3f1-42ef-b32d-03e4bb17f30f

Catalogue record

Date deposited: 17 Jul 2007
Last modified: 18 Feb 2021 17:14

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Contributors

Author: Z. Xu ORCID iD
Author: W. Choo
Author: G. Chen

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