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Temperature effect on space charge dynamics in XLPE insulation

Temperature effect on space charge dynamics in XLPE insulation
Temperature effect on space charge dynamics in XLPE insulation
This paper reports on space charge evolution in crosslinked polyethylene (XLPE) planar samples approximately 1.20 mm thick subjected to electric stress level of 30 kVdc/mm under four temperature 25 oC, 50 oC, 70 oC and 90 oC for 24 hours. Space charge profiles in both as-received and degassed samples were measured using the laser induced pressure pulse (LIPP) technique. The dc threshold stresses at which space charge initiates are greatly affected by testing temperatures. The results suggest that testing temperature has numerous effects on space charge dynamics such as enhancement of ionic dissociation of polar crosslinked by-products, charge injection, charge mobility and electrical conductivity. Space charge distributions of very different nature were seen at lower temperatures when comparing the results of as-received samples with degassed samples. However at higher temperature, the space charge distribution took the same form, although of lower concentration in degassed samples. Space charge distributions are dominated by positive charge when tested at high temperatures regardless of sample treatment and positive charge propagation enhances as testing temperature increases. This can be a major cause of concern as positive charge propagation has been reported to be related to insulation breakdown.
space charge, charge injection, crosslinked polyethylene insulation, heat treatment, ionization
1070-9878
65-76
Chong, Y L
840d104f-c7df-427b-9ef4-b8e535c0f46c
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Ho, Y F F
d4320db9-0f48-4e59-be44-f757ead10967
Chong, Y L
840d104f-c7df-427b-9ef4-b8e535c0f46c
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Ho, Y F F
d4320db9-0f48-4e59-be44-f757ead10967

Chong, Y L, Chen, G and Ho, Y F F (2007) Temperature effect on space charge dynamics in XLPE insulation. IEEE Transactions on Dielectrics & Electrical Insulation, 14 (1), 65-76.

Record type: Article

Abstract

This paper reports on space charge evolution in crosslinked polyethylene (XLPE) planar samples approximately 1.20 mm thick subjected to electric stress level of 30 kVdc/mm under four temperature 25 oC, 50 oC, 70 oC and 90 oC for 24 hours. Space charge profiles in both as-received and degassed samples were measured using the laser induced pressure pulse (LIPP) technique. The dc threshold stresses at which space charge initiates are greatly affected by testing temperatures. The results suggest that testing temperature has numerous effects on space charge dynamics such as enhancement of ionic dissociation of polar crosslinked by-products, charge injection, charge mobility and electrical conductivity. Space charge distributions of very different nature were seen at lower temperatures when comparing the results of as-received samples with degassed samples. However at higher temperature, the space charge distribution took the same form, although of lower concentration in degassed samples. Space charge distributions are dominated by positive charge when tested at high temperatures regardless of sample treatment and positive charge propagation enhances as testing temperature increases. This can be a major cause of concern as positive charge propagation has been reported to be related to insulation breakdown.

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More information

Published date: February 2007
Keywords: space charge, charge injection, crosslinked polyethylene insulation, heat treatment, ionization
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 263477
URI: https://eprints.soton.ac.uk/id/eprint/263477
ISSN: 1070-9878
PURE UUID: 16b3c1c2-a681-4a6b-8644-0ca73d35381d

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Date deposited: 18 Feb 2007
Last modified: 18 Jul 2017 07:45

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