Apparent Mobility and its Relationship with Ageing in Polymeric Insulation Materials (invited talk)


Chen, George and Van Nguyen , T (2008) Apparent Mobility and its Relationship with Ageing in Polymeric Insulation Materials (invited talk). At 2008 International Conference on Condition Monitoring and Diagnosis, Beijing, China, 21 - 24 Apr 2008. IEEE, 633-637.

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Description/Abstract

Apparent mobility obtained from space charge decay measurement has been recently used as an ageing marker to assess degradation of the insulation materials. The apparent mobility of charge carriers becomes slower after experiencing electrical ageing. In this paper, we have measured space charge decay in polymeric insulation material using the pulsed electroacoustic technique and studied apparent mobility features in a wide range of the applied fields and poling times. It has been found that the increase in the applied field and poling time produces more deep trapped charges, leading to a decrease in apparent mobility with time. For a specific time, the detrapping process is dominated by the charges of specific trap levels, resulting in a time dependent apparent mobility. In addition it has been found a sudden increase in apparent mobility at high fields, indicating that a precaution has to be taken when assessing the ageing using the method.

Item Type: Conference or Workshop Item (Speech)
Additional Information: Event Dates: April 21 - 24, 2008
ISBNs: 9781424416219
Keywords: space charge, apparent mobility, polymeric insulation, electrical ageing, high electric field, trapping characteristic.
Divisions: Faculty of Physical Sciences and Engineering > Electronics and Computer Science
Faculty of Physical Sciences and Engineering > Electronics and Computer Science > EEE
ePrint ID: 265620
Date Deposited: 28 Apr 2008 08:46
Last Modified: 27 Mar 2014 20:10
Publisher: IEEE
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/265620

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