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Space Charge Behaviour in Thick Oil-Impregnated Pressboard under HVDC Stresses

Space Charge Behaviour in Thick Oil-Impregnated Pressboard under HVDC Stresses
Space Charge Behaviour in Thick Oil-Impregnated Pressboard under HVDC Stresses
As the main insulation applied in HVDC convertor transformer, the dielectric properties of oil-pressboard insulation system play an important role in the reliability of power system. One of the key problems related to any HVDC insulation systems is the easy formation of space charge within the bulk and at the interfaces. In this paper, space charge behaviour in the impregnated pressboard with 1mm in thickness is investigated using the pulsed electroacoustic (PEA) technique under different DC stresses at the room temperature. To study the influence of transformer oil status, the 1mm thick dried pressboards are separately impregnated with fresh oil and serviced aged oil. The PEA results show that homo-charge injection occurs for all the measurements. Both applied stress and oil status can affect the space charge behaviour, however, it has been found the oil status is the dominant factor in the present study. The electric field enhanced by the charges is about 45% in the aged oil samples and 15% in the fresh oil samples.
978-1-4673-4459-3
397-400
Hao, M
fb7006e0-07c0-46f5-9279-e30a7d3bd614
Zhou, Y
2dd820ca-fb03-496b-8a45-f2a11816c4b5
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Wilson, G
25fbd90e-6949-481c-9e75-0d457003c839
Jarman, P
390aafbd-393e-4e20-bace-b4416e0dd456
Hao, M
fb7006e0-07c0-46f5-9279-e30a7d3bd614
Zhou, Y
2dd820ca-fb03-496b-8a45-f2a11816c4b5
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Wilson, G
25fbd90e-6949-481c-9e75-0d457003c839
Jarman, P
390aafbd-393e-4e20-bace-b4416e0dd456

Hao, M, Zhou, Y, Chen, G, Wilson, G and Jarman, P (2013) Space Charge Behaviour in Thick Oil-Impregnated Pressboard under HVDC Stresses. IEEE 2013 International Conference on Solid Dielectrics (ICSD), Bologna, Italy. 30 Jun - 04 Jul 2013. pp. 397-400 .

Record type: Conference or Workshop Item (Paper)

Abstract

As the main insulation applied in HVDC convertor transformer, the dielectric properties of oil-pressboard insulation system play an important role in the reliability of power system. One of the key problems related to any HVDC insulation systems is the easy formation of space charge within the bulk and at the interfaces. In this paper, space charge behaviour in the impregnated pressboard with 1mm in thickness is investigated using the pulsed electroacoustic (PEA) technique under different DC stresses at the room temperature. To study the influence of transformer oil status, the 1mm thick dried pressboards are separately impregnated with fresh oil and serviced aged oil. The PEA results show that homo-charge injection occurs for all the measurements. Both applied stress and oil status can affect the space charge behaviour, however, it has been found the oil status is the dominant factor in the present study. The electric field enhanced by the charges is about 45% in the aged oil samples and 15% in the fresh oil samples.

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Published date: 30 June 2013
Venue - Dates: IEEE 2013 International Conference on Solid Dielectrics (ICSD), Bologna, Italy, 2013-06-30 - 2013-07-04
Organisations: EEE

Identifiers

Local EPrints ID: 354481
URI: http://eprints.soton.ac.uk/id/eprint/354481
ISBN: 978-1-4673-4459-3
PURE UUID: 159ad2fd-a75d-43a2-8b19-cde7c2f8e58b

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Date deposited: 11 Jul 2013 11:17
Last modified: 09 Sep 2019 18:47

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