Simulation And Optimization Of Switchgear Based On Finite Element Method

Electrical Switchgear plays an important role in the transmission and distribution equipment of electric power system.Whether the Electrical Switchgear is reliable or not affects the power quality of power system directly.Insulation performance and mechanical strength play a vital role in the safety of the switchgear. How to improve the insulation performance of switch equipment and mechanical strength performance effectively with the existing technology is a research emphasis of switchgear in the future. The development of finite element method and the improvement of computer make that possible.This article is divided into two parts, the electric field distribution calculation of the new type vacuum circuit breaker and the analysis and optimization of switchgear frame in aseismic reliability.First part, based on the finite element method, the software of Solidworks is used to establish three-dimensional model of new type vacuum circuit breaker in the first part. The finite element analysis software of ANSYS Workbench is used to calculation electric field intensity in new type vacuum circuit breaker with 3D simulation. Results show that air gap position of operate rod in the vacuum circuit breaker is the most concentrated area about the electric field intensity. We can solve the problem of electric field intensity concentration in the air gap between the high voltage conductor and earth potential by increasing the insulation rod chamfering or eliminating air gap with epoxy resin. Accordingly,the strength of vacuum circuit breaker insulation meets the design requirement.Second part, two kinds of switchgear frame structure 3D model are established by the software of Solidworks. The linear static mechanics analysis under earthquake loading is done by using the equivalent static method and the finite element analysis software of ANSYS Workbench. The results show that the seismic performance in the Yi-xing frame structure switchgear is better than C-xing frame structure switchgear. The problem of stress concentration at the bottom of switchgear under an earthquake load can be solved by increasing the number of stiffener beside the switchgear and changing the connect of stiffener under the switchgear. The analysis results provide a theoretical basis for the design and development of the actual product.