Research Article

Research on the electric field intensity distribution of high-voltage cable terminal improved by non-linear material

Electric Power Research Institute of State Grid Hebei Electric Power Co., Ltd., Shijiazhuang, Hebei 050021, China

^* e-mail: rxgw35@163.com

Received: 29 April 2021
Accepted: 22 June 2021

Abstract

The electric field distortion caused by the high voltage current environment in the cable terminal will greatly increase the failure probability and reduce the operation safety; therefore, it is necessary to ensure the uniform distribution of the electric field in the terminal. This paper briefly introduced the high-voltage cable terminal and non-linear materials. The traditional silicone rubber and the silicone rubber added with nano-SiO₂ were prepared. The electrical conductivity of the two silicone rubbers was tested, and the electric field of the cable terminal was simulated. The results demonstrated that the nano-SiO₂ improved silicone rubber had a higher non-linear conductivity and was less affected by temperature. The calculation results of the simulation model also showed that the distribution of the internal field strength was more uniform, and the maximum field strength on the reinforced insulation was smaller after the improved silicone rubber was used as the reinforced insulation.