NDLI: Comparison of two schools of polymeric ageing models: Causes and effects of space charge

Content Provider	IEEE Xplore Digital Library
Author	Alghamdi, H.A. Chen, G. Vaughan, A.S.
Copyright Year	2012
Description	Author affiliation: The Tony Davies High Voltage Laboratory University of Southampton, Southampton, SO17 1BJ, UK (Alghamdi, H.A.; Chen, G.; Vaughan, A.S.)
Abstract	One of the most significant current discussions in insulation materials is the influence of space charge on electrical ageing processes. The space charge observed under both dc and ac high voltage makes the role of space charge in electrical ageing increasingly difficult to ignore. A considerable amount of literature has been published on electrical ageing models with different physical mechanisms. This paper will review a number of models in association with the effect of the presence of space charge, but will not seek to treat space charge explicitly. Rather, space charge will be considered implicitly as an ageing effect in some models, even though it can be argued that it is both a cause and a consequence of progressive physical and chemical changes within the material in other aging models. The validity of the model will be examined to analyze their effectiveness and the difficulties that may occur in the prediction process is explained, which may reduce the accuracy of the predictions of each approach. These models are classified to two schools of thoughts which are based on the time function of the Eying rate equation and adjusted to demonstrate the physical mechanism for each model. The models that fall within the scope of this study are fitted with experimental data with appropriate parameters values for each model. Therefore, the physical mechanisms of lifeexpression of each model cannot be critically valid for all insulation materials.
Starting Page	827
Ending Page	830
File Size	299603
Page Count	4
File Format	PDF
ISBN	9781467312530
ISSN	00849162
e-ISBN	9781467312523
e-ISBN	9781467312516
DOI	10.1109/CEIDP.2012.6378908
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2012-10-14
Publisher Place	Canada
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Aging Space charge Mathematical model Insulation Polymers Electric fields electrical and thermal stresses Ageing space charge life models
Content Type	Text
Resource Type	Article

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