Research On Novel High Voltage Vacuum Switches Based On Virtual Prototyping Technology

High voltage switchgear is one of the most important electrical power units(EPU's) in the power transmission and distribution system.Due to its superiority,the vacuum switch has been applied broadly in this area.Development and research on the vacuum switches are briefly reviewed in the first.Then,based on the new design method of electromechanical equipments,a novel design idea about vacuum switch,the Virtual Prototyping(VP) technology,is proposed.The optimal design of vacuum switches involves many aspects,that is mostly focused on electric parameters and mechanical parameters.For the former,beside the opening and closing characters of vacuum interrupter,two problems should been related to.One is the electric field distribution caused by line voltage,the other is conductor heat caused by load or failure current.For the latter,some aspects are involved,such as static strength,dynamic system,and so on.Electric parameters are the target of part of mechanical parameters' optimal design.To get optimization of mechanical dynamic parameters,kinematics and dynamics analysis are needed.Based on the VP technology,the conception of the VP technology for HV vacuum switch is proposed in this dissertation.Then,using computer and a series of software,the model made VP of vacuum switch,the stress field VP of parts,the thermal field VP of electric heat and the mechanical dynamic VP of kinematics system are realized.These results are applied in simulation and optimization of electric and mechanical parameters for vacuum switch.As the first application,the VP technology is used in the function design of the HV vacuum load-disconnection switch,which is the integration of HV vacuum load switch and HV disconnection switch.The VP is proposed to get the optimization in electric and mechanical properties.Based on the function and structure characters,one new operating device is developed.Then,based on the structure characters and operating theory,the optimal model of its dimensions and momentum output is proposed using MATLAB.Subsequently, based on the kinematics and dynamic analysis of HV vacuum load switch,the structure dimensions of kinematics system are obtained by momentum optimization.The results are validated by the simulation of PRO/ENGINEER Wildfire.The mechanical characteristic test and verifying test of the model machine are carried out to show the feasibility and the validity for the approach. Vacuum interrupter is the kernel of the vacuum switch.Its design is the bottleneck problem in the development of high voltage vacuum switch.As the second application of VP, a novel 72.5 kV HV vacuum interrupter is optimized using the VP technology.Two problems are solved for it.One is heat field VP,the other is electric field VP.Using the heat field VP technology,the sections of the movable and fixed contact are optimized,and using the electric field VP technology,the structure of symmetrical potential shields is optimized.The ageing test and static insulation test are carried out for the vacuum interrupters designed by above optimal results.The results show that the novel 72.5 kV HV vacuum interrupter has better static insulation properties.As the third application of VP,based on the theory of the vacuum switch with multiple breaks,the 126 kV HV double-break vacuum circuit breaker is proposed,which is connected with two 72.5 kV HV vacuum interrupter.Due to the influence of the HV electric field structure to electric field distribution,a novel HV double-break vacuum circuit breaker is proposed,which is optimized by the VP technology.The voltage distribution on each break test has been carried out to show the double-break voltage-sharing property,and the voltage static insulation test has been carried out to show double-break breakdown voltage improve factor property.Using the VP technology,the kinematics system of the 126 kV HV double-break vacuum circuit breaker is obtained,and the mechanical characteristic test results are given to show the feasibility and the validity of the optimal results.The short circuit breaking current opening test has been performed for 126kV HV double-break vacuum circuit breaker with the synthetic test loop,which has been established in Institute of Power and Electronics of Dalian University of Technology,and the test accords with the standard of GB 1984-2003 and GB/T 4473-2008.The results show that the 126 kV HV double-break vacuum circuit breaker has the electric parameters for 126 kV voltage grade.The 72.5 kV HV vacuum interrupter and the 126 kV HV double-break vacuum circuit breaker are parts of the key-project of NSFC:"Arc plasma adjusting and controlling in metal vapor and its applications in the field of high voltage circuit breakers".