Electric Field Regulation by Multi-dimensional Functional Materials for DC-GIS Spacer

Abstract

This paper offers a simulation study on the application of a novel approach to control the electric field around a basin-type spacer by combining permittivity functionally graded materials ($\varepsilon$-FGM) and superficially nonlinear conductivity materials (SNCM), namely multi-dimensional functional materials (MDFM). The permittivity distribution of the $\varepsilon$-FGM spacer is designed by the iteration optimization algorithm, and the epoxy/SiC composites with 30 and 60 phr (parts per hundred) doping contents are assigned as the coating materials of two SNCM spacers, namely SNCM30 and SNCM60. The MDFM spacer combines $\varepsilon$-FGM in its bulk and SNCM60 on its surface. The electric field regulation effect of each functional spacer is investigated under variable conditions, i.e., DC steady state (DC-steady), DC turn-on state (DC-on), DC polarity reversal (DC- PR). Results show that the applicability of $\varepsilon$-FGM and SNCM is limited to transient and stationary conditions, respectively. The MDFM spacer combines the advantages of $\varepsilon$-FGM and SNCM for adaptively relaxing the electric field under all the above conditions.