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Space charge measurement and modelling in cross-linked polyethylene

Space charge measurement and modelling in cross-linked polyethylene
Space charge measurement and modelling in cross-linked polyethylene
Cross-linked polyethylene, commercially known as XLPE, is widely used as an insulating material in high voltage cables. However, space charge accumulation under the DC field is one of the most challenging problems in the further development of XLPE insulated cable. Due to the potential electrical degradation ageing process triggered by the accumulated space charges, the IEEE standard 1732 was established for measuring space charge in HVDC extruded cables as the qualification tests. Previous research has revealed that space charge originates from either charge injection at the electrodes or ionization of impurities presenting inside the bulk. In the light of this, this paper aims to simulate the accumulation of space charge in XLPE under DC stress. Space charge measurements have been carried on the fresh and degassed XLPE samples. A modified bipolar charge transport model, by considering the dissociation of impurities, has been employed to simulate the space charge behavior in XLPE. Compared with the experimental observations, the simulation results can reveal appropriate features of hetero charge formation. Both the calculated charge dynamics and field variation are consistent with the experiment results. The restrictions and potential improvements of this preliminary model are also discussed for its future application of XLPE cables.
Bipolar charge transport model, Cross-linked polyethylene, Hetero charge formation, Ionization, Space charge measurement
1996-1073
Zhan, Yunpeng
5d162333-4c63-4b95-9a11-87d6b438aea0
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Hao, Miao
f60b8d94-e401-4548-9dc1-a642ea1ef4cc
Pu, Lu
eee505a4-59ce-4862-8af4-5ab74de4937c
Zhao, Xuefeng
3e51bbcb-1ac0-4adf-9e1f-08162e7678aa
Wang, Sen
25f8bc99-0fb6-4974-9b9c-90d30f119403
Liu, Jian
36c6c90f-65ef-4727-bb00-55c84795e937
Zhan, Yunpeng
5d162333-4c63-4b95-9a11-87d6b438aea0
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Hao, Miao
f60b8d94-e401-4548-9dc1-a642ea1ef4cc
Pu, Lu
eee505a4-59ce-4862-8af4-5ab74de4937c
Zhao, Xuefeng
3e51bbcb-1ac0-4adf-9e1f-08162e7678aa
Wang, Sen
25f8bc99-0fb6-4974-9b9c-90d30f119403
Liu, Jian
36c6c90f-65ef-4727-bb00-55c84795e937

Zhan, Yunpeng, Chen, George, Hao, Miao, Pu, Lu, Zhao, Xuefeng, Wang, Sen and Liu, Jian (2020) Space charge measurement and modelling in cross-linked polyethylene. Energies, 13 (8), [1906]. (doi:10.3390/en13081906).

Record type: Article

Abstract

Cross-linked polyethylene, commercially known as XLPE, is widely used as an insulating material in high voltage cables. However, space charge accumulation under the DC field is one of the most challenging problems in the further development of XLPE insulated cable. Due to the potential electrical degradation ageing process triggered by the accumulated space charges, the IEEE standard 1732 was established for measuring space charge in HVDC extruded cables as the qualification tests. Previous research has revealed that space charge originates from either charge injection at the electrodes or ionization of impurities presenting inside the bulk. In the light of this, this paper aims to simulate the accumulation of space charge in XLPE under DC stress. Space charge measurements have been carried on the fresh and degassed XLPE samples. A modified bipolar charge transport model, by considering the dissociation of impurities, has been employed to simulate the space charge behavior in XLPE. Compared with the experimental observations, the simulation results can reveal appropriate features of hetero charge formation. Both the calculated charge dynamics and field variation are consistent with the experiment results. The restrictions and potential improvements of this preliminary model are also discussed for its future application of XLPE cables.

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More information

Accepted/In Press date: 5 April 2020
Published date: 13 April 2020
Keywords: Bipolar charge transport model, Cross-linked polyethylene, Hetero charge formation, Ionization, Space charge measurement

Identifiers

Local EPrints ID: 439706
URI: http://eprints.soton.ac.uk/id/eprint/439706
ISSN: 1996-1073
PURE UUID: e759d275-6c01-4b62-92f7-b684f9f26ea6
ORCID for Yunpeng Zhan: ORCID iD orcid.org/0000-0002-8171-8107

Catalogue record

Date deposited: 30 Apr 2020 16:30
Last modified: 14 Sep 2021 18:11

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