Research on the non-linear conductivity characteristics of nano-Sic silicone rubber composites

Silicon carbide (SiC) is an inorganic material which has non-linear conductivity characteristics. When mixed nano-size SiC into silicone rubber (SIR), the composites can achieve non-linear conductivity characteristics also. In this paper, the non-linear conductivity properties of 5wt%, 15wt%, 30wt%, 45wt% nano-SiC/SIR composites are investigated. The relationship between conductivity and electric field is obtained. In order to know the effect of non-linear SiC/SIR composites on homogenizing electric field, the electric stress distribution of nonlinear insulation cables termination is simulated by finite element method. The results show that the SiC/SIR composites can homogenize the electric field distribution of cable termination effectively. With the increase of non-linear conductivity level, the electric field distribution of cable termination with non-linear SiC/silicone rubber composite is more homogenization.