Study of the charge dynamics in mineral oil under a non-homogeneous field


The presence of mobile charge carriers will have an effect on the frequency response of complex permittivity of insulating liquid when the frequency is low. It has been found that the experimental results of the complex permittivity of mineral oils are in an exceedingly sensible agreement with Coelho???s frequency response theory when an extra contribution to the complicated permittivity arising from DC conduction is taken into account. It has been reported that little quantity of high mobility charge carriers are accountable for this DC conduction. In our previous work, we tend to have found that if the charge carriers are fast enough therefore that they'll reach the other electrode during a cycle, the motion of those quick charge carriers can only contribute to the imaginary part of the complicated permittivity under a homogeneous field. During this paper, the polarization induced by the motion of those quick charge carriers under a non- homogeneous field has been studied. It has been found when the sphere isn't high, the full current caused by the drift and diffusion of those fast charge carriers is proportional to the external voltage. A modified area charge polarization theory has been proposed. The frequency dependence of the advanced permittivity obtained experimentally has been fitted using this changed Coelho model and compared with our previous simulation. This changed model allows one to realize a better understanding of the frequency response in mineral oil in low frequency regions.

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