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Numeric description of space charge in polyethylene under ac electric fields

Numeric description of space charge in polyethylene under ac electric fields
Numeric description of space charge in polyethylene under ac electric fields
Space charge in polyethylene-based insulation materials and its effect on the local electric field under a dc environment have been extensively examined over the last few decades while the behavior of space charge under ac stress has received less attention. Space charge phenomenon under ac electric fields becomes an important issue with increased operating field strength in many applications, such as next generation high voltage cables. In this paper, a bipolar charge transport model has been developed to simulate space charge in polymers under ac electric fields. Obtained simulation results show that there is a small quantity of phase-dependent bipolar charge accumulation in the vicinity of the electrodes that does not move into the bulk under ac stress. This causes a slight distortion of the local field in the bulk. However, at lower frequencies less than 1 Hz, there is increased charge accumulation and penetration. Comparison with available experimental data suggests that the model is capable of describing the underlying physics of charge behavior when a dielectric material is subjected to ac electric fields. Due to the weak charge movement in the bulk, the conduction current density is small and hence the displacement component dominates the total current density and this increases linearly with ac frequency.
0021-8979
124107-1 -124107-7
Zhao, Junwei
b3fc6668-bcfd-4ba3-8c44-809cc7f26727
Xu, Zhiqiang
797f8b0e-a035-4cf9-ac3f-99098a3fdb50
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Lewin, Paul L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e
Zhao, Junwei
b3fc6668-bcfd-4ba3-8c44-809cc7f26727
Xu, Zhiqiang
797f8b0e-a035-4cf9-ac3f-99098a3fdb50
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Lewin, Paul L
78b4fc49-1cb3-4db9-ba90-3ae70c0f639e

Zhao, Junwei, Xu, Zhiqiang, Chen, George and Lewin, Paul L (2010) Numeric description of space charge in polyethylene under ac electric fields. Journal of Applied Physics, 108 (12), 124107-1 -124107-7.

Record type: Article

Abstract

Space charge in polyethylene-based insulation materials and its effect on the local electric field under a dc environment have been extensively examined over the last few decades while the behavior of space charge under ac stress has received less attention. Space charge phenomenon under ac electric fields becomes an important issue with increased operating field strength in many applications, such as next generation high voltage cables. In this paper, a bipolar charge transport model has been developed to simulate space charge in polymers under ac electric fields. Obtained simulation results show that there is a small quantity of phase-dependent bipolar charge accumulation in the vicinity of the electrodes that does not move into the bulk under ac stress. This causes a slight distortion of the local field in the bulk. However, at lower frequencies less than 1 Hz, there is increased charge accumulation and penetration. Comparison with available experimental data suggests that the model is capable of describing the underlying physics of charge behavior when a dielectric material is subjected to ac electric fields. Due to the weak charge movement in the bulk, the conduction current density is small and hence the displacement component dominates the total current density and this increases linearly with ac frequency.

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Published date: 23 December 2010
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 271861
URI: http://eprints.soton.ac.uk/id/eprint/271861
ISSN: 0021-8979
PURE UUID: 75841472-aac3-414a-9a5d-f7981a57f6cb
ORCID for Zhiqiang Xu: ORCID iD orcid.org/0000-0002-6640-7335
ORCID for Paul L Lewin: ORCID iD orcid.org/0000-0002-3299-2556

Catalogue record

Date deposited: 03 Jan 2011 16:48
Last modified: 15 Mar 2024 03:36

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Contributors

Author: Junwei Zhao
Author: Zhiqiang Xu ORCID iD
Author: George Chen
Author: Paul L Lewin ORCID iD

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