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Space charge behavior in thick oil-impregnated pressboard under HVDC stresses

Space charge behavior in thick oil-impregnated pressboard under HVDC stresses
Space charge behavior in thick oil-impregnated pressboard under HVDC stresses
The space charge accumulation can affect the dielectric performance of oilimpregnated pressboard in convertor transformers. In this paper, the space charge behaviour in 1mm thick impregnated pressboards is investigated by the means of pulsed electroacoustic method. The dried pressboards are separately impregnated in fresh oil and service aged oil as comparison. The space charge distributions are investigated under ±15 kV/mm and ±25 kV/mm at room temperature. The homocharge injection can be observed for all the samples, which is much more significant in the aged oil impregnated samples. The amount of injected charges and the depth of the
injected charges accumulation in the pressboard bulk are closely related to the oil properties, amplitude and polarity of the applied voltages. The service aged oil shows
the dominant effects on the local electric field distortion, about 48% enhanced in the aged oil impregnated samples while about 15% enhanced in the fresh oil impregnated samples. The estimations of the apparent charge mobility and trap depth also indicate the great impacts caused by the service aged oil
72-80
Hao, M
ff81d148-50ae-4e41-9358-8bf8b905b463
Zhou, Y.
a5398d19-1c29-40ca-9c74-72a1fa2db5e6
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Wilson, Gordon
fd02d259-a5b6-44ce-be29-47073c552c5b
Jarman, Paul
f0133a9d-702e-489a-afc5-2950eeba10ab
Hao, M
ff81d148-50ae-4e41-9358-8bf8b905b463
Zhou, Y.
a5398d19-1c29-40ca-9c74-72a1fa2db5e6
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Wilson, Gordon
fd02d259-a5b6-44ce-be29-47073c552c5b
Jarman, Paul
f0133a9d-702e-489a-afc5-2950eeba10ab

Hao, M, Zhou, Y., Chen, George, Wilson, Gordon and Jarman, Paul (2015) Space charge behavior in thick oil-impregnated pressboard under HVDC stresses. IEEE Transactions on Dielectrics & Electrical Insulation, 22 (1), 72-80. (doi:10.1109/TDEI.2014.004570).

Record type: Article

Abstract

The space charge accumulation can affect the dielectric performance of oilimpregnated pressboard in convertor transformers. In this paper, the space charge behaviour in 1mm thick impregnated pressboards is investigated by the means of pulsed electroacoustic method. The dried pressboards are separately impregnated in fresh oil and service aged oil as comparison. The space charge distributions are investigated under ±15 kV/mm and ±25 kV/mm at room temperature. The homocharge injection can be observed for all the samples, which is much more significant in the aged oil impregnated samples. The amount of injected charges and the depth of the
injected charges accumulation in the pressboard bulk are closely related to the oil properties, amplitude and polarity of the applied voltages. The service aged oil shows
the dominant effects on the local electric field distortion, about 48% enhanced in the aged oil impregnated samples while about 15% enhanced in the fresh oil impregnated samples. The estimations of the apparent charge mobility and trap depth also indicate the great impacts caused by the service aged oil

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Published date: February 2015
Organisations: EEE

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Local EPrints ID: 380100
URI: http://eprints.soton.ac.uk/id/eprint/380100
PURE UUID: 05d5e7e7-9eeb-48d1-acdd-fab1f9eaf661

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Date deposited: 04 Sep 2015 10:36
Last modified: 02 Dec 2019 20:33

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