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Experimental studies of influence of DC and AC electric fields on bridging in contaminated transformer oil

Experimental studies of influence of DC and AC electric fields on bridging in contaminated transformer oil
Experimental studies of influence of DC and AC electric fields on bridging in contaminated transformer oil
Analysis of real operating condition revealed that HVDC transformers experience combined effect of DC biased AC electric field. The dynamics of pressboard particle in contaminated transformer oil under the influence of DC, AC and DC biased AC electric field has been investigated in this paper. Different levels of particle concentrations are tested at different applied voltages. Optical images of the particles accumulation together with conduction current have been recorded during the experiments. A complete bridge between the electrodes of cellulose particles were observed for all the tests carried out under DC and DC biased AC electric field. Opposite to that, for AC experiments, pressboard particles accumulated on surfaces of both electrodes but did not create a full bridge between the electrodes. It is concluded that a combination of DC and AC voltages in a HVDC transformer could lead to a bridge formation within the equipment which could cause failure.
hvdc transformer, failure, contamination, dielectrophoresis, drag force, bridging
152-160
Mahmud, S.
37e36ae1-2092-474b-b362-7d6b10af0247
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Wilson, G.
8fd34f42-b70e-48a6-b256-cd6f938aa8c1
Jarman, P.
a9793465-653f-4d51-ad8c-3fb313393aaa
Mahmud, S.
37e36ae1-2092-474b-b362-7d6b10af0247
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Golosnoy, I.O.
40603f91-7488-49ea-830f-24dd930573d1
Wilson, G.
8fd34f42-b70e-48a6-b256-cd6f938aa8c1
Jarman, P.
a9793465-653f-4d51-ad8c-3fb313393aaa

Mahmud, S., Chen, G., Golosnoy, I.O., Wilson, G. and Jarman, P. (2015) Experimental studies of influence of DC and AC electric fields on bridging in contaminated transformer oil. IEEE Transactions on Dielectrics and Electrical Insulation, 22 (1), Winter Issue, 152-160. (doi:10.1109/TDEI.2014.004573).

Record type: Article

Abstract

Analysis of real operating condition revealed that HVDC transformers experience combined effect of DC biased AC electric field. The dynamics of pressboard particle in contaminated transformer oil under the influence of DC, AC and DC biased AC electric field has been investigated in this paper. Different levels of particle concentrations are tested at different applied voltages. Optical images of the particles accumulation together with conduction current have been recorded during the experiments. A complete bridge between the electrodes of cellulose particles were observed for all the tests carried out under DC and DC biased AC electric field. Opposite to that, for AC experiments, pressboard particles accumulated on surfaces of both electrodes but did not create a full bridge between the electrodes. It is concluded that a combination of DC and AC voltages in a HVDC transformer could lead to a bridge formation within the equipment which could cause failure.

Text
TDEI Proof Paper 4573 (Mahmud) 061014.pdf - Accepted Manuscript
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More information

Accepted/In Press date: 6 October 2014
e-pub ahead of print date: 12 February 2015
Published date: 12 February 2015
Keywords: hvdc transformer, failure, contamination, dielectrophoresis, drag force, bridging
Organisations: EEE

Identifiers

Local EPrints ID: 373914
URI: http://eprints.soton.ac.uk/id/eprint/373914
PURE UUID: 03c99d89-4af4-40cd-be12-3731d332b51b

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Date deposited: 03 Feb 2015 13:45
Last modified: 20 Mar 2020 17:38

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Contributors

Author: S. Mahmud
Author: G. Chen
Author: I.O. Golosnoy
Author: G. Wilson
Author: P. Jarman

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