雷击燃弧瞬态过程中真空阳极触头烧蚀分析及优化OA

As the core component of vacuum circuit breakers,the arc resistance and ablation characteristics of the arc extinguishing chamber determine the breaking performance and service life of the circuit breaker.Therefore,in this paper,a lightning arc contact ablation model considering the flow of the anode molten pool is constructed.Differ-ent current intensities are used as input conditions to simulate the transient process of arc burning.The influence law of current size on anode ablation in the transient process of lightning arc burning is summarized,and the influence of different current intensities on the anode thermal process is deeply analyzed.Subsequently,a central composite ex-periment is designed based on this model,and a contact material composition optimization method based on the com-bination of neural network and NSGA-II algorithm is proposed to determine the optimal composition of copper-based multi-component contact materials.Finally,the optimal mass ratio of contact material content was determined as Cu 77.13%,Cr 5.86%,W 10.69%,Ag 5.93%,Graphene 0.39%.Before and after optimization,the mass loss and axial ab-lation velocity decreased by 50.2%and 41.3%respectively,and the maximum temperature decreased by 5.63%.This research provides theoretical basis and technical support for the development of new contact materials for vacuum arc extinguishing chambers.