Modelling charge generation and transport in solid organic dielectrics under DC stress
Résumé
Models describing the behavior of organic dielectric under electrical and thermal stress would be extremely useful in the development of more compact, reliable and ecofriendly systems for conversion and transport of electric energy. With information on conductivity and permittivity, it is possible to predict the behavior of a dielectric as a function of temperature and field. These data are however not sufficient and space charges need to be taken into account. Hence, models including charge generation and transport function of time and space need to be developed. It is particularly the case when the object under study is a cable, as the electric field and temperature are no more homogeneous within the insulation. In the present paper, simulations have been performed using a one-dimensional cylindrical model, featuring charge injection, transport, trapping, detrapping and recombination, in order to highlight the effects of geometry, temperature and temperature gradients on the material behavior.
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