Skin and Ferranti effects of ZnO internal current to very fast transient current

Response characteristics of a ZnO element generally used for surge arresters against very fast transients are hardly known. They have not only nonlinear resistance characteristics but also dielectric ones. The authors have developed an analytical digital program to study internal resistive and capacitive currents of the element to very fast transient current, based on Maxwell equations. And moreover, its equivalent circuit has been developed. This paper shows not only the outline of theory and equivalent circuit, but also that of skin and Ferranti effects on ZnO internal currents