Simulation analysis and calculation of electric field distribution characteristics of UHV wall bushing

Abstract

Facing the unbalanced development of resource distribution and productivity, China needs long-distance power transmission and distribution. The long-distance power transmission will lead to a lot of power loss in the process of transmission. In order to achieve long-distance, large capacity, low loss power transmission, it is necessary to build UHV transmission and transformation lines in the power grid for cross regional power allocation. As the key equipment in UHV transmission and transformation, UHV bushing plays a very important role in UHV transmission and transformation line. However, due to working in UHV electric field for a long time, the reduction of UHV bushing failure rate is very important for the smooth operation of UHV transmission line. Therefore, it is necessary to study the electric field distribution characteristics of UHV bushing. In this paper, the electric field distribution characteristics of UHV through wall bushing are studied. The simulation analysis and calculation of electric field are carried out by using COMSOL Multiphysics finite element software. By analyzing the electric field distribution of the complex field areas such as the central conductor of the bushing, the end of the liner, the sheath and the capacitor core, the electric field distribution law and the edge electric field diagram of the bushing and its adjacent key areas under different voltage types are obtained. The radial axial electric field distribution of the capacitor core and the edge electric field distribution of the upper and lower steps are compared and analyzed Based on the analysis of the characteristics and local complex field, the variation law of the electric field distribution of the bushing with the structure design is obtained, which provides an optimization idea for the insulation structure design of UHV through wall bushing.