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Space charge effect on the impulse breakdown of low density polyethylene

Space charge effect on the impulse breakdown of low density polyethylene
Space charge effect on the impulse breakdown of low density polyethylene
Polymeric materials employed in the power transmission system may be subjected to transient voltages resulting from lighting strokes or switching surges. The rise time of these transient voltages varies in a large range from a fraction of microsecond to several hundred microseconds. The breakdown often occurs during the transient overvoltage. In the present report the breakdown stress of low density polyethylene subjected to impulse with different rise times has been measured. Single impulse was employed in order to reduce space charge ageing effect. It has been found that the breakdown stress increases with the rise time initially and becomes stable when the rise time reaches to 350?s. However, DC breakdown strength is slightly lower than the stable value obtained from the impulse. The results indicate that the space charge plays a very important role in the breakdown. The presence of space charge has been confirmed by the direct measurements of the space charge in the bulk using the pulsed electroacoustic method.
Impulse breakdown, space charge, low-density polyethylene
7-900371-56-7
133-136
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Chen, G
3de45a9c-6c9a-4bcb-90c3-d7e26be21819

Chen, G (2003) Space charge effect on the impulse breakdown of low density polyethylene. The 2nd International Conference on Insulation Condition Monitoring of Electrical Plant, Chongqing, China. 27 - 30 Oct 2003. pp. 133-136 .

Record type: Conference or Workshop Item (Other)

Abstract

Polymeric materials employed in the power transmission system may be subjected to transient voltages resulting from lighting strokes or switching surges. The rise time of these transient voltages varies in a large range from a fraction of microsecond to several hundred microseconds. The breakdown often occurs during the transient overvoltage. In the present report the breakdown stress of low density polyethylene subjected to impulse with different rise times has been measured. Single impulse was employed in order to reduce space charge ageing effect. It has been found that the breakdown stress increases with the rise time initially and becomes stable when the rise time reaches to 350?s. However, DC breakdown strength is slightly lower than the stable value obtained from the impulse. The results indicate that the space charge plays a very important role in the breakdown. The presence of space charge has been confirmed by the direct measurements of the space charge in the bulk using the pulsed electroacoustic method.

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More information

Published date: 2003
Venue - Dates: The 2nd International Conference on Insulation Condition Monitoring of Electrical Plant, Chongqing, China, 2003-10-27 - 2003-10-30
Keywords: Impulse breakdown, space charge, low-density polyethylene
Organisations: Electronics & Computer Science, EEE

Identifiers

Local EPrints ID: 258515
URI: https://eprints.soton.ac.uk/id/eprint/258515
ISBN: 7-900371-56-7
PURE UUID: 59ebafda-56e8-4114-90e2-3fe40f500586

Catalogue record

Date deposited: 10 Nov 2003
Last modified: 07 Jan 2019 17:31

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