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On the space charge and DC breakdown behavior of polyethylene/silica nanocomposites

On the space charge and DC breakdown behavior of polyethylene/silica nanocomposites
On the space charge and DC breakdown behavior of polyethylene/silica nanocomposites
Space charge occurs in a dielectric material when the rate of charge accumulation is different from the rate of removal, which arises due to moving or trapped charges.
Inevitably, the local electric field is increased at some point within the material, which then leads to faster degradation and premature failure. The determination of space charge behavior has seen wide implementation in characterizing novel dielectric materials, especially in connection with the newly emerging field of nanocomposites. In this paper, we report on an investigation into space charge dynamics in silica-based polyethylene nanocomposites. The various systems differed with respect to the amount of filler and its surface chemistry; the pulsed electro-acoustic (PEA) technique was used to evaluate the space charge distribution in each. Experimental results indicate that the incorporation of nanosilica into polyethylene results in a significant amount of homocharge development near both electrodes. With appropriate surface treatment of the nanofiller, homocharge formation was successfully suppressed, indicating less severe space charge development in the nanocomposite materials. The mechanisms leading to the observed space charge development and direct current (DC) breakdown properties of the nanocomposites are discussed.
nanocomposites, nanodielectrics, polyethylene, silica, space charge, DC breakdown
1070-9878
340-351
Lau, K.Y.
4f20d9d7-c517-4af9-bb57-b4f47538bf68
Vaughan, A.S.
6d813b66-17f9-4864-9763-25a6d659d8a3
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Hosier, I.L.
6a44329e-b742-44de-afa7-073f80a78e26
Holt, A.F.
d8269e80-8de2-4117-a6d6-f71345546c5b
Ching, Kuan Yong
e110eecb-94c8-4415-b705-19bb5ebf937b
Lau, K.Y.
4f20d9d7-c517-4af9-bb57-b4f47538bf68
Vaughan, A.S.
6d813b66-17f9-4864-9763-25a6d659d8a3
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Hosier, I.L.
6a44329e-b742-44de-afa7-073f80a78e26
Holt, A.F.
d8269e80-8de2-4117-a6d6-f71345546c5b
Ching, Kuan Yong
e110eecb-94c8-4415-b705-19bb5ebf937b

Lau, K.Y., Vaughan, A.S., Chen, George, Hosier, I.L., Holt, A.F. and Ching, Kuan Yong (2014) On the space charge and DC breakdown behavior of polyethylene/silica nanocomposites. IEEE Transactions on Dielectrics & Electrical Insulation, 21 (1), 340-351. (doi:10.1109/TDEI.2013.004043).

Record type: Article

Abstract

Space charge occurs in a dielectric material when the rate of charge accumulation is different from the rate of removal, which arises due to moving or trapped charges.
Inevitably, the local electric field is increased at some point within the material, which then leads to faster degradation and premature failure. The determination of space charge behavior has seen wide implementation in characterizing novel dielectric materials, especially in connection with the newly emerging field of nanocomposites. In this paper, we report on an investigation into space charge dynamics in silica-based polyethylene nanocomposites. The various systems differed with respect to the amount of filler and its surface chemistry; the pulsed electro-acoustic (PEA) technique was used to evaluate the space charge distribution in each. Experimental results indicate that the incorporation of nanosilica into polyethylene results in a significant amount of homocharge development near both electrodes. With appropriate surface treatment of the nanofiller, homocharge formation was successfully suppressed, indicating less severe space charge development in the nanocomposite materials. The mechanisms leading to the observed space charge development and direct current (DC) breakdown properties of the nanocomposites are discussed.

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Accepted/In Press date: 3 September 2013
e-pub ahead of print date: 20 February 2014
Published date: 20 February 2014
Keywords: nanocomposites, nanodielectrics, polyethylene, silica, space charge, DC breakdown
Organisations: EEE

Identifiers

Local EPrints ID: 373685
URI: http://eprints.soton.ac.uk/id/eprint/373685
ISSN: 1070-9878
PURE UUID: 739dc058-ed3a-41b9-ae33-49e3dac82557
ORCID for A.S. Vaughan: ORCID iD orcid.org/0000-0002-0535-513X
ORCID for I.L. Hosier: ORCID iD orcid.org/0000-0003-4365-9385

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Date deposited: 28 Jan 2015 16:48
Last modified: 27 Jan 2020 13:40

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Contributors

Author: K.Y. Lau
Author: A.S. Vaughan ORCID iD
Author: George Chen
Author: I.L. Hosier ORCID iD
Author: A.F. Holt
Author: Kuan Yong Ching

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