In power transmission systems, the electric field distribution of dense aluminum bus duct has a crucial impact on its operational stability and safety. Reasonable internal structure design can effectively improve the electric field distribution and enhance the overall performance of the bus duct.
First of all, the layout form of the busbar is one of the key factors. Using a symmetrical busbar arrangement structure, such as three-phase busbars arranged in an equilateral triangle, can make the electric field distribution relatively uniform. Because in this layout, the distance between each phase busbar is equal, the charge distribution is more balanced, and the local concentration of the electric field is reduced. In the electric field calculation, according to Coulomb's law, the force between charges is inversely proportional to the square of the distance. The symmetrical layout can make the electric field force on each phase busbar uniform, thereby reducing the risk of discharge caused by uneven electric field and improving the insulation of the bus duct. performance and longevity.
Secondly, adding an electric field shielding device inside the bus duct can significantly improve the electric field distribution. For example, set up a metal shielding plate and place it reasonably between the busbars or between the busbars and the shell. The shielding plate can induce the opposite charge to the bus charge, thereby weakening the electric field intensity and guiding the electric field lines to distribute along a more reasonable path. For some high-voltage or application scenarios that require extremely high electric field uniformity, by accurately calculating the material, thickness and position of the shielding plate, the peak electric field intensity can be reduced by 30% - 50%, effectively preventing problems such as partial discharge caused by electric field distortion.
Furthermore, optimizing the insulation support structure inside the bus duct also has a positive effect on electric field distribution. The shape, size and material properties of the insulating support all affect the electric field distribution. Using an insulating support with a smooth surface and a large curvature radius can reduce the distortion of the electric field on its surface. For example, changing the traditional right-angled edge insulating support into a rounded transition shape can avoid charge accumulation at sharp corners and make the electric field distribution smoother. At the same time, choosing an insulating material with an appropriate dielectric constant can better match the electric field characteristics of the aluminum busbar, make the electric field spread more uniformly in the insulating medium, reduce the unevenness of the electric field, and improve the insulation reliability of the busbar.
Finally, using computer simulation technology to conduct electric field distribution analysis and structural optimization design is an important means of modern busway design. Through software such as finite element analysis, the electric field distribution under different internal structure design schemes can be accurately simulated and predicted during the design stage. According to the simulation results, the parameters of the bus layout, shielding device and insulation support structure were adjusted. After multiple iterations of optimization, the best internal structure design solution was found to ensure that the dense aluminum bus duct has good electric field distribution characteristics in actual operation and ensures power supply. The safety and stability of transmission can reduce failures and maintenance costs caused by electric field problems, and improve the reliability and economy of the entire power system.
