Electricity is a key energy source for economic development and must be prioritized. Looking ahead to the development of China's enterprise power management system in the next 30 years, high current enclosed bus ducts are one of the key information technology issues. Generally, high current enclosed busbars use forced air cooling to reduce the temperature rise and area of the enclosed busbar. But this also brings a problem: the high-speed working gas flowing through the enclosed system busbar in the forced air cooling high current circulates in the enclosed busbar, and the friction with the busbar, shell, supporting insulators, etc. continuously affects ions, except for thermal emission and partial discharge. Due to other reasons, ions are generated; At the same time, due to the fact that the enclosed bus wire is composed of multiple buses, the joint welds may be poorly processed, and mechanical vibrations during the transportation and operation of the enclosed bus may lead to the presence of metal particles inside the enclosed bus. Gas ions and metal particles will form space charges in a closed bus with the airflow. When the charge density reaches a certain value for the enterprise, it will cause bus breakdown or flashover, causing serious social harm. Gas ions and metal particles will form space charges in a closed bus with the airflow. When the charge density reaches a certain value for the enterprise, it will cause bus breakdown or flashover, causing serious social harm. Gas ions and metal particles will form space charges in a closed bus with the airflow. When the charge density reaches a certain value for the enterprise, it will cause bus breakdown or flashover, causing serious social harm.

At present, some developed countries abroad have realized the seriousness of this problem and begun to study it. In China, research in this area has just begun and is a new scientific research topic. This article studies the electric field distortion caused by space charges in enclosed busbars from the perspective of "field", and analyzes the influence of the development of space charges on the performance of insulation materials in enclosed busbars. And determine the safe density range of space charges inside the enclosed bus. The main research content of this article will provide relevant theoretical basis for the development of insulation design for enclosed bus ducts.

The effect of space charge on the electric field far from the insulator. The presence of space charges in a closed bus causes deformation of the electric field. The space far away from the insulator is minimally affected by the insulator and can be considered as passing through a coaxial cylinder. The shape of the area around the insulator is relatively systematic. This article considers both scenarios and analyzes space charges below the density of insulators. The enclosed busbar experiences breakdown or flashover. Calculation and result analysis of electric field far away from insulators. The area away from the insulator in the enclosed bus duct can be regarded as a coaxial cylinder. Due to the presence of space charges, the electric field is represented by the Poisson equation, where ρ is the charge density and cylindrical coordinates are used. The boundary development condition is r=RM, φ=U, where RM is the radius of the enclosed system busbar passing through the conductor r=RK, φ=0, and RK is the radius of the enclosed busbar shell.

When the insulator is radially divided along the busbar, the charge density in the surrounding area is lower than that in the axial division when breakdown or flashover occurs. Therefore, to ensure the normal operation of the enclosed busbar, the charge density in the area around the insulator should not exceed 8.0 × 10-5C/m2 to maintain a safe range of charge density. It should be assembled in a closed area. In order to reduce the charge density in the deionization device of the bus duct, it has become very important for enterprises to carry out research on air-cooled enclosed bus deionization detection devices.

Analytical calculation of electric field far away from the insulator in a closed bus duct. To ensure the safe management and operation of self enclosed buses, the spatial charge distribution density should be kept below -9.2 × 10-5C/m2.