Role of external and internal parameters on the space charge formation in dielectrics

Abstract

Space charge accumulation in dielectrics is a hot topic among dielectric research group for more than a decade. The charge accumulation has been observed to be of various types like homo, hetero and packet charge, etc. Volume resistivity and its non-uniform distribution has been suspected for formation of space charge. The author has recently shown that apart from volume resistivity, diffusion coefficient plays a significant role on the type of charge formation. Several issues still remain unaddressed. In the current paper, the author investigates the role of internal properties like volume resistivity and diffusion and external parameters like boundary conditions or condition of electrodes on the formation of space charge more clearly. It has been shown that manipulation in any of the parameters can alter the type of charge formation. It shows a direction for investigation of new insulation materials with suitable material properties and suitable boundaries for minimizing space charge effects. Interesting results have been presented that seem to have not been presented earlier.