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Space charge behavior in oil gap and impregnated pressboard combined system under HVDC stresses

Space charge behavior in oil gap and impregnated pressboard combined system under HVDC stresses
Space charge behavior in oil gap and impregnated pressboard combined system under HVDC stresses
The reliability of oil-pressboard insulation system used in high voltage direct current (HVDC) convertor transformers can be affected by the presence of space charge. In this paper, the space charge behaviors in a 0.5 mm thick oil film combined with a 1mm thick impregnated pressboard have been investigated by the pulsed electroacoustic (PEA) technique under 12 kV/mm and 20 kV/mm at room temperature for both short term and long time tests. Two types of oil with different aging status were used for comparison. The results show that a charge peak is quickly formed at the interface between oil and pressboard with the same polarity as the electrode at the oil film side. However, the dynamics of the interfacial charges are very different for fresh oil and aged oil samples. The maximum electric field occurs in the middle of the pressboard, which is significantly enhanced in the aged oil samples. Compared with the Maxwell-Wagner (MW) polarization, more space charges are formed in the insulation system. It needs much longer time to reach steady state, depending on the status of the oil. The interfacial and bulk effects result in a significant electric field enhancement in the middle of pressboard, especially in aged oil samples.
848-858
Hao, Miao
fb7006e0-07c0-46f5-9279-e30a7d3bd614
Zhou, Yuan
22d46dcb-26b9-4416-80a3-efc58d81a061
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Wilson, Gordon
fd02d259-a5b6-44ce-be29-47073c552c5b
Jarman, Paul
f0133a9d-702e-489a-afc5-2950eeba10ab
Hao, Miao
fb7006e0-07c0-46f5-9279-e30a7d3bd614
Zhou, Yuan
22d46dcb-26b9-4416-80a3-efc58d81a061
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Wilson, Gordon
fd02d259-a5b6-44ce-be29-47073c552c5b
Jarman, Paul
f0133a9d-702e-489a-afc5-2950eeba10ab

Hao, Miao, Zhou, Yuan, Chen, George, Wilson, Gordon and Jarman, Paul (2016) Space charge behavior in oil gap and impregnated pressboard combined system under HVDC stresses. IEEE Transactions on Dielectrics & Electrical Insulation, 23 (2), 848-858. (doi:10.1109/TDEI.2015.005293).

Record type: Article

Abstract

The reliability of oil-pressboard insulation system used in high voltage direct current (HVDC) convertor transformers can be affected by the presence of space charge. In this paper, the space charge behaviors in a 0.5 mm thick oil film combined with a 1mm thick impregnated pressboard have been investigated by the pulsed electroacoustic (PEA) technique under 12 kV/mm and 20 kV/mm at room temperature for both short term and long time tests. Two types of oil with different aging status were used for comparison. The results show that a charge peak is quickly formed at the interface between oil and pressboard with the same polarity as the electrode at the oil film side. However, the dynamics of the interfacial charges are very different for fresh oil and aged oil samples. The maximum electric field occurs in the middle of the pressboard, which is significantly enhanced in the aged oil samples. Compared with the Maxwell-Wagner (MW) polarization, more space charges are formed in the insulation system. It needs much longer time to reach steady state, depending on the status of the oil. The interfacial and bulk effects result in a significant electric field enhancement in the middle of pressboard, especially in aged oil samples.

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Accepted/In Press date: 2 December 2015
Published date: April 2016
Organisations: EEE

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Local EPrints ID: 402979
URI: http://eprints.soton.ac.uk/id/eprint/402979
PURE UUID: 3f78fe75-5432-4095-ac76-372b4e0942e3

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Date deposited: 21 Nov 2016 14:12
Last modified: 16 Dec 2019 19:36

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Contributors

Author: Miao Hao
Author: Yuan Zhou
Author: George Chen
Author: Gordon Wilson
Author: Paul Jarman

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