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Study of space charge dynamics in oil and pressboard composite system under different polarity reversal voltages

Study of space charge dynamics in oil and pressboard composite system under different polarity reversal voltages
Study of space charge dynamics in oil and pressboard composite system under different polarity reversal voltages
The impacts caused by the polarity reversal of the applied voltage on space charge dynamics and electric field enhancement across an oil gap have been studied in an oil gap and single-layer pressboard composite insulation system. The experimental results validate that the electric field enhancement across the oil gap immediately after the application of the reversed electric field is directly dependent on the number of residual charges within the insulation system at the moment of the application of the reversed stress. Therefore, the electric field enhancement in the system is strongly dependent on the magnitude of the applied electric field, the duration of polarity reversal and the degradation of the mineral oil. An estimation of the enhanced electric field immediately after polarity reversal based on the charge decay characteristics has been proposed and successfully applied to calculate the electric field enhancement in an aged oil sample under 20 kV/mm, which cannot be accurately measured due to the very fast space charge dynamics in the aged oil under a strongly enhanced electric field.
0914-4935
1109-1121
Hao, Miao
181e8cd2-9050-412f-8234-6aa0ecec23f2
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Chen, Xin
927cf7ef-386c-42b5-aac4-c35836675619
Zhang, Chong
77caa4ba-ea19-4fa6-b92e-b77dc6e00b81
Li, Wenpeng
e2596a0a-cf53-441f-a95f-fb2cd41c7be0
Wang, Haitian
7f867657-bb51-48a8-ad1a-98241c1d02b9
Zhou, Mingyu
964c43a7-3a1e-4b39-9008-1d3bd29ac82f
Lei, Xianzhang
5fb22438-77e5-48d1-9851-b2109286504c
Hao, Miao
181e8cd2-9050-412f-8234-6aa0ecec23f2
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Chen, Xin
927cf7ef-386c-42b5-aac4-c35836675619
Zhang, Chong
77caa4ba-ea19-4fa6-b92e-b77dc6e00b81
Li, Wenpeng
e2596a0a-cf53-441f-a95f-fb2cd41c7be0
Wang, Haitian
7f867657-bb51-48a8-ad1a-98241c1d02b9
Zhou, Mingyu
964c43a7-3a1e-4b39-9008-1d3bd29ac82f
Lei, Xianzhang
5fb22438-77e5-48d1-9851-b2109286504c

Hao, Miao, Chen, George, Chen, Xin, Zhang, Chong, Li, Wenpeng, Wang, Haitian, Zhou, Mingyu and Lei, Xianzhang (2017) Study of space charge dynamics in oil and pressboard composite system under different polarity reversal voltages. Sensors and Materials, 29 (8), 1109-1121, [8]. (doi:10.18494/SAM.2017.1422).

Record type: Article

Abstract

The impacts caused by the polarity reversal of the applied voltage on space charge dynamics and electric field enhancement across an oil gap have been studied in an oil gap and single-layer pressboard composite insulation system. The experimental results validate that the electric field enhancement across the oil gap immediately after the application of the reversed electric field is directly dependent on the number of residual charges within the insulation system at the moment of the application of the reversed stress. Therefore, the electric field enhancement in the system is strongly dependent on the magnitude of the applied electric field, the duration of polarity reversal and the degradation of the mineral oil. An estimation of the enhanced electric field immediately after polarity reversal based on the charge decay characteristics has been proposed and successfully applied to calculate the electric field enhancement in an aged oil sample under 20 kV/mm, which cannot be accurately measured due to the very fast space charge dynamics in the aged oil under a strongly enhanced electric field.

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Accepted/In Press date: 22 March 2017
e-pub ahead of print date: 16 August 2017
Published date: 18 October 2017

Identifiers

Local EPrints ID: 427251
URI: http://eprints.soton.ac.uk/id/eprint/427251
ISSN: 0914-4935
PURE UUID: 6b4498e6-93c3-4478-bba6-461e26bef2c8

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Date deposited: 09 Jan 2019 17:33
Last modified: 06 Oct 2020 19:00

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