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Space charge dynamics in oil and thick pressboard combined system under polarity reversal voltage

Space charge dynamics in oil and thick pressboard combined system under polarity reversal voltage
Space charge dynamics in oil and thick pressboard combined system under polarity reversal voltage
In this study, the space charge dynamics in an oil and oil impregnated pressboard combined insulation system are investigated by the means of pulsed electroacoustic (PEA) technique under voltage polarity reversal conditions. To be closer to the real case in convertor transformers, a 1mm thick pressboard covered with a 0.5mm thick oil film were used as the testing sample. For comparison, three types of oil with different aging stages were used: fresh oil, medium aged oil and severely aged oil. The external electric field was firstly applied +10kV/mm for 1hour, then reversed to -10kV/mm in 1min period. After that, the -10kV/mm was applied for 1 hour. The results have clearly shown the impact of the oil film and the interface between oil and pressboard on charge dynamics under polarity reversal conditions. The electric field enhancement and the time constant of the 'mirror image effect' have been analyzed for different cases.
978-1-4799-7525-9
867-870
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 (2014) Space charge dynamics in oil and thick pressboard combined system under polarity reversal voltage. 2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Des Moines, United States. 19 - 22 Oct 2014. pp. 867-870 . (doi:10.1109/CEIDP.2014.6995811).

Record type: Conference or Workshop Item (Paper)

Abstract

In this study, the space charge dynamics in an oil and oil impregnated pressboard combined insulation system are investigated by the means of pulsed electroacoustic (PEA) technique under voltage polarity reversal conditions. To be closer to the real case in convertor transformers, a 1mm thick pressboard covered with a 0.5mm thick oil film were used as the testing sample. For comparison, three types of oil with different aging stages were used: fresh oil, medium aged oil and severely aged oil. The external electric field was firstly applied +10kV/mm for 1hour, then reversed to -10kV/mm in 1min period. After that, the -10kV/mm was applied for 1 hour. The results have clearly shown the impact of the oil film and the interface between oil and pressboard on charge dynamics under polarity reversal conditions. The electric field enhancement and the time constant of the 'mirror image effect' have been analyzed for different cases.

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More information

Published date: 20 October 2014
Venue - Dates: 2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena, Des Moines, United States, 2014-10-19 - 2014-10-22
Organisations: EEE

Identifiers

Local EPrints ID: 373689
URI: http://eprints.soton.ac.uk/id/eprint/373689
ISBN: 978-1-4799-7525-9
PURE UUID: b4941ab0-73c9-4205-b7f3-8ec7b8b4fa79

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Date deposited: 23 Jan 2015 16:14
Last modified: 25 Nov 2019 20:37

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