Research On Passive Vibration Reduction Control Of Combined "T" Circuit Breaker Based On SMA

With the rapid development of the social and economic levels of countries around the world,people’s production and life are increasingly dependent on the power system,and power facilities play an indispensable role in all walks of life.The combined "T-type" circuit breaker is a typical representative of electric porcelain-type high-voltage electrical equipment.Due to its material properties and the special form of its structure,the damage in the earthquake is particularly serious.Many areas of China are earthquake-prone areas,and the direct and indirect economic losses caused by high-voltage electrical equipment damaged in the earthquake are very serious.Therefore,research on seismic performance of electric porcelain-type high-voltage electrical equipment and shock-absorbing reinforcement protection have extremely important research significance and practical application value.In this paper,the seismic vibration table test and finite element analysis are used as the analysis tools.The seismic performance analysis of the combined “T-type” circuit breaker is carried out,and the passive cable made by Shape Memory Alloy(SMA)is used.Shock-absorbing reinforcement protection.The specific research content of this paper is:(1)This paper analyzes the seismic damage of electric porcelain type electric equipment structures in the past great earthquakes at home and abroad,summarizes the reasons why the electric porcelain type electric equipment structures are easy to be damaged in earthquakes,and analyzes the latest research results on the seismic performance and shock absorption protection of electric porcelain type circuit breaker structures at home and abroad.(2)The LW15A-363/Y(model)combined "T-type" circuit breaker produced by a high-voltage switch company was used as a structural prototype,and the vibration table test model was designed according to the similar theory.The selection process of the similarity relationship of the parameters of the structural model and the specific production process of the experimental model are expounded.Based on the phase-change pseudo-elasticity of shape memory alloy,a set of SMA passive damping cables was designed and applied to the one-way simulation shaking table test of the structural model of the combined "T-type" circuit breaker.Considering the complexity of the actual earthquake and the possibility of practical application of the SMA cable,a cable-type SMA composite 3D damping system that can be used for the prototype of the combined "T-type" circuit breaker is designed,and the work of the damping system is described.principle.(3)In the shaking table test,the white noise sweep is first performed,and the dynamic characteristics of the test model structure itself are obtained.Then,EL-Centro wave,artificial wave(Lanzhou wave)and Taiwan Chi-Chi wave recorded at CHY025 station were used as external input excitation,and the combined "T-type" circuit breaker test model structure was subjected to various working conditions.One-way simulated seismic shaker test.The results show that the SMA passive cable damping system proposed in this paper can effectively reduce the seismic response at the top of the model structure.Under the AG8 condition,the combined "T-type" circuit breakers can achieve displacement displacement rates of 38.1%,27.71% and 27.02% under the excitation of El Centro wave,Taiwan Chi-Chi wave and artificial wave(Lanzhou wave).the acceleration damping rate reached 21.11%,18.1% and 17.4%,respectively,and the damping effect is obvious.(4)The ABAQUS finite element analysis software was used to analyze the dynamic characteristics of the experimental model structure and the seismic response characteristics of the controlled time,and compared with the above test results.The results show that the experimental results are in good agreement with the finite element analysis results,indicating that the finite element analysis model is reliable and can be used for finite element analysis of prototype structures.At the same time,the paper also discusses the influence of SMA wire length and cable inclination on its damping effect.When the wire length is 200 mm and the inclination angle is 60 degrees,the cable has better damping effect,which can be used for engineering application.In addition,the shock absorption effect of the prototype structure is also analyzed,and the main conclusions are consistent with the analysis results of the model structure.