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Measurement of space charge in XLPE insulation under 50 Hz ac electric stresses using the LIPP method

Measurement of space charge in XLPE insulation under 50 Hz ac electric stresses using the LIPP method
Measurement of space charge in XLPE insulation under 50 Hz ac electric stresses using the LIPP method
Space charge is believed to play an important role in ac electrical ageing of polymeric insulation, particularly where electrical treeing is the dominant cause of premature failure. The majority of work to date has been on the space charge characteristics under dc electric stresses, whereas work on the dynamics and the role of space charge on electrical breakdown under 50 Hz ac conditions have only received limited attention. Consequently, a full understanding of space charge trapping and dynamics under ac operating conditions is required if ever more reliable polymer insulated cable systems are to be developed. The present paper reports on aspects of an on-going investigation into the measurement of space charge in XLPE insulation under 50 Hz ac stress using the laser induced pressure propagation (LIPP) technique. Some important features of the method are described such as, ?point on wave? control of the laser and use of correction factors to offset variations in the laser power and ablation of the target material. Emphasis has also been placed on establishing a simple method for analysing data, termed ?X-plots?. Some preliminary results of the space charge and electric stress distribution of undegassed and degassed crosslinked polyethylene (XLPE) plaques aged electrically under ac stress (30 kV/mmpeak) for 24 hours are also presented.
1070-9878
Ho, Y. F. F.
9d4605db-8b38-4c4d-8d9f-3db7f235a335
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Davies, A. E.
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Swingler, S. G.
cffe3b5b-b7a3-4836-b0ba-9f4cd05c8a8f
Suttun, S. J.
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Hampton, R. N.
4daf53d4-1443-4f31-bc1d-163b864330c2
Hobdell, S
a16b9ce5-fb09-4052-a602-bcdd404b50e4
Ho, Y. F. F.
9d4605db-8b38-4c4d-8d9f-3db7f235a335
Chen, G.
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Davies, A. E.
56d95222-b259-494a-92e9-68b090ec0dcd
Swingler, S. G.
cffe3b5b-b7a3-4836-b0ba-9f4cd05c8a8f
Suttun, S. J.
b0c2b53a-4e93-4328-8c2f-cf8b51693ba9
Hampton, R. N.
4daf53d4-1443-4f31-bc1d-163b864330c2
Hobdell, S
a16b9ce5-fb09-4052-a602-bcdd404b50e4

Ho, Y. F. F., Chen, G., Davies, A. E., Swingler, S. G., Suttun, S. J., Hampton, R. N. and Hobdell, S (2002) Measurement of space charge in XLPE insulation under 50 Hz ac electric stresses using the LIPP method. IEEE Transactions on Dielectrics & Electrical Insulation, Vol. 9.

Record type: Article

Abstract

Space charge is believed to play an important role in ac electrical ageing of polymeric insulation, particularly where electrical treeing is the dominant cause of premature failure. The majority of work to date has been on the space charge characteristics under dc electric stresses, whereas work on the dynamics and the role of space charge on electrical breakdown under 50 Hz ac conditions have only received limited attention. Consequently, a full understanding of space charge trapping and dynamics under ac operating conditions is required if ever more reliable polymer insulated cable systems are to be developed. The present paper reports on aspects of an on-going investigation into the measurement of space charge in XLPE insulation under 50 Hz ac stress using the laser induced pressure propagation (LIPP) technique. Some important features of the method are described such as, ?point on wave? control of the laser and use of correction factors to offset variations in the laser power and ablation of the target material. Emphasis has also been placed on establishing a simple method for analysing data, termed ?X-plots?. Some preliminary results of the space charge and electric stress distribution of undegassed and degassed crosslinked polyethylene (XLPE) plaques aged electrically under ac stress (30 kV/mmpeak) for 24 hours are also presented.

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More information

Published date: June 2002
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 256572
URI: http://eprints.soton.ac.uk/id/eprint/256572
ISSN: 1070-9878
PURE UUID: f4443f16-bb77-4f6c-8722-ab9d1bb7444c

Catalogue record

Date deposited: 09 May 2002
Last modified: 16 Jul 2019 22:58

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Contributors

Author: Y. F. F. Ho
Author: G. Chen
Author: A. E. Davies
Author: S. G. Swingler
Author: S. J. Suttun
Author: R. N. Hampton
Author: S Hobdell

University divisions

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