直流供电系统成为全电/多电飞机和中低压工业供用电的发展趋势，而直流保护断路器的现状限制了供电系统向大容量方向发展。高频强迫分断下真空电弧调控机理研究成为真空开关成功应用的关键和迫切需要。本项目提出正弦直曲面和正弦圆周曲面两种新型触头结构，分析曲面触头接触面应力和电场分布均匀化与触头结构的关系；搭建强迫分断回路及直流真空电弧观测系统，实验研究正弦圆周曲面和正弦直曲面触头在不同材料下的燃弧、等离子体扩散过程和电弧生成物凝结过程，揭示曲面触头直流真空电弧形态演变规律；建立曲面触头真空电弧等离子体磁流体动力学模型，掌握高频强迫分断下真空电弧扩散与熄灭调控机理。本项目依据真空电弧调控机理及高频分断特性，寻求曲面触头系统最佳频率，提出短间隙直流真空曲面触头设计方案和长寿命、小型化真空开关设计的原理方法，为研制适用于航空直流和工业直流电源系统开断容量为15kA真空开关提供理论依据。

With the application and development of DC power supply system in more electric aircraft and low-voltage industry field, the development of power supply system with lager capacity is limited by the status of protection circuit breaker. Research on control strategy of vacuum arc under high frequency forced interrupting becomes the key to the successful application of the vacuum switch and urgent need. Two novel contact structures named the sine ruled surface contact and sine revolution surface contact will be proposed in the project to research the relationship between distribution uniformity of stress and electric field on curved surface contact interface and structure of contact. By observing arc image, analysis the process of arc movement, arc diffusion and products condensation in the contact surface with different contact structural parameters and materials and grasp the control mechanism of vacuum arc evolution. MHD model is set up to get the control mechanism of vacuum arc diffusion and extinguishing stage under high frequency forced interrupting. The principle and method of designing vacuum arc force interrupting circuit system and auxiliary circuit are put forward. It is significant to provide a theoretical basis for the development of the miniaturization vacuum switch which has the breaking capability of 15kA and is suitable for DC power supply system in aero and industrial application.