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Apparent mobility and its relationship with ageing in polymeric insulation materials

Chen, G. and Van Nguyen, T. (2008) Apparent mobility and its relationship with ageing in polymeric insulation materials 2008 International Conference on Condition Monitoring and Diagnosis, pp. 633-7.

Record type: Article


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.

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Published date: 2008
Additional Information: Imported from ISI Web of Science
Organisations: EEE


Local EPrints ID: 269441
PURE UUID: d2d41a05-3818-4143-93ed-95f22096fe66

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Date deposited: 21 Apr 2010 07:46
Last modified: 18 Jul 2017 06:51

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Author: G. Chen
Author: T. Van Nguyen

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