Prefabricated rubber stress cone is the key part of high voltage cable terminal in the electric power system

and its property is the main factor in determining whether high voltage cable operates safely. We establish finite element numerical simulation models to analyze the electric field distribution of 110 kV cable terminal. Instead of using fixed conductivity material

the materials with nonlinear conductivity are used as the insulation material for rubber stress cones. The polymer composites with nonlinear conductivity that depends on applied electrical fields can smartly smooth the non-uniform electrical fields through fitting material parameters with the electrical fields. Combined with theoretical analysis

we can further determine the parameter range of nonlinear conductivity material. By comparing with the electric fields distribution of different materials

the results show that if the switching electric field is excessively large

the electric field at the rubber stress cone face will be excessively large; otherwise the electric field at junction will be excessively large. However

an appropriate nonlinear conductivity polymer composites can effectively improve the electric fields at the rubber stress cone face and the junction

and it has an important role in promoting the development of higher voltage cable in the future.