摘要
Abstract
In the process of opening and closing of high voltage circuit breaker,the strength of transmission system directly affects the mechanical fatigue life of the product.For the 550 kV circuit breaker,the voltage level is im-proved compared with previous products,which means it is more difficult to meet the requirement of mechanical life.So it is necessary to predict and improve the structural strength of static side transmission system more accurately to meet the fatigue life target.In this paper,the flexible transient dynamic model for static side transmission system of double moving self-energized interrupter is established.The model is based on Hypermesh for pre-processing.The transient dynamics is solved by Ls-dyna.During the analysis process,the explicit algorithm is used,and the grid type,contact type,gap influence,collision impact are fully considered.The stress simulation results show high stress risk in the key parts during opening and closing operation under different speed conditions.Taking the pull rod pin as an example,the high stress distribution map and stress time domain curve are listed.The peak stress reaches about 380 MPa,and there is room for optimization.At the same time,the results of contact force,velocity curve and system energy between components are also output.These simulation results show that the magnitude and direction of con-tact force and the change of speed are in line with the actual movement trend.The hourglass energy has never exceed-ed 5%of the peak internal energy,and there is no obvious slip and penetration in the contact.So these results ensure the rationality of the simulation analysis.Then the design concept is optimized for the high stress area and compared with the baseline concept by simulation.The comparison results show that the peak stress of each risk point is signifi-cantly reduced,and the stress reduction ratio of the risk point on the cross beam,guide rail and small gasket can reach up to 50%,which means the optimization effect is obvious.The fatigue life of the optimization scheme is ana-lyzed,and results show that the stress risk point of the key parts can reach more than 10 000 times.Finally,the me-chanical life experiment is carried out,and results show that the optimization scheme can meet the requirements of ten thousand mechanical life without excessive wear,which verifies the effectiveness of the simulation results and the optimization design.关键词
高压断路器/瞬态动力学/显示算法/静侧传动系统/优化设计Key words
high voltage circuit breaker/transient dynamic/explicit algorithm/static side transmission system/optimization
