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Thermal ageing and its impact on charge trap density and breakdown strength in ldpe LDPE

Thermal ageing and its impact on charge trap density and breakdown strength in ldpe LDPE
Thermal ageing and its impact on charge trap density and breakdown strength in ldpe LDPE
Low-density polyethylene (LDPE) has been widely used as power cable insulation, because of its good electrical performance and stable chemical characteristics. However, in recent years, with the rise of large-capacity and long-distance HVDC transmission systems, the effect of space charge has a significant impact on the insulation selection and design. Furthermore, the change in the electrical performance of insulation after ageing is also required to be understood. It has been reported that ageing leads to an increase in charge trap density. The increase of trap density in LDPE makes the transport of charge carriers between traps easier. Consequently, the electrical breakdown strength will also be affected. This paper focuses on the LDPE films with different degrees of thermal ageing and studies its impact on charge trap density and change in electrical breakdown strength. The ageing degrees of sample were characterized using Fourier-Transform Infrared (FTIR). Space charge dynamics were measured using the pulsed electroacoustic (PEA) technique. In addition, electrical breakdown strength of the aged samples was measured and breakdown data were processed using the Weibull distribution. The change in characteristic breakdown strength is related to the change in charge trap density. The results suggest that the change in charge trap density of an insulating material can be used to characterize electrical performance of the material, therefore, the ageing status.
Li, Ziyun
06b41be9-3827-4831-914e-80964b39e998
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Fu, Mingli
4243dd1d-68a9-43b3-b339-f8f8a28f217f
Hou, Shuai
cab140b3-1a0f-4db3-8246-c65ca43589c5
Li, Ziyun
06b41be9-3827-4831-914e-80964b39e998
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Fu, Mingli
4243dd1d-68a9-43b3-b339-f8f8a28f217f
Hou, Shuai
cab140b3-1a0f-4db3-8246-c65ca43589c5

Li, Ziyun, Chen, George, Fu, Mingli and Hou, Shuai (2015) Thermal ageing and its impact on charge trap density and breakdown strength in ldpe LDPE. 19th International Symposium on High Voltage Engineering, Czech Republic. 23 - 28 Aug 2015. 6 pp .

Record type: Conference or Workshop Item (Paper)

Abstract

Low-density polyethylene (LDPE) has been widely used as power cable insulation, because of its good electrical performance and stable chemical characteristics. However, in recent years, with the rise of large-capacity and long-distance HVDC transmission systems, the effect of space charge has a significant impact on the insulation selection and design. Furthermore, the change in the electrical performance of insulation after ageing is also required to be understood. It has been reported that ageing leads to an increase in charge trap density. The increase of trap density in LDPE makes the transport of charge carriers between traps easier. Consequently, the electrical breakdown strength will also be affected. This paper focuses on the LDPE films with different degrees of thermal ageing and studies its impact on charge trap density and change in electrical breakdown strength. The ageing degrees of sample were characterized using Fourier-Transform Infrared (FTIR). Space charge dynamics were measured using the pulsed electroacoustic (PEA) technique. In addition, electrical breakdown strength of the aged samples was measured and breakdown data were processed using the Weibull distribution. The change in characteristic breakdown strength is related to the change in charge trap density. The results suggest that the change in charge trap density of an insulating material can be used to characterize electrical performance of the material, therefore, the ageing status.

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Published date: 23 August 2015
Venue - Dates: 19th International Symposium on High Voltage Engineering, Czech Republic, 2015-08-23 - 2015-08-28
Organisations: EEE

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Local EPrints ID: 383645
URI: http://eprints.soton.ac.uk/id/eprint/383645
PURE UUID: 9d77cc2b-6a90-433b-8dd6-a2f9136b1332

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Date deposited: 17 Nov 2015 16:31
Last modified: 17 Jul 2017 20:11

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