Multi-physical Coupling Analysis And Structure Improvement Of SDA524 252kV GIS Equipment

The full name of GIS is Gas Insulated Metal-enclosed Switchgear.As a kind of advanced high-voltage switchgear electrical equipment in the power equipment industry so far,its main features include compact global structure,strong adaptability to complex environment,stable operation,high safety and easy daily maintenance.In many domestic and foreign power stations and substations,GIS equipment has been widely used as an important part of power transmission and transformation equipment.However,GIS equipment is generally faced with a harsh working environment and complex overall or partial force conditions.With the gradual increase of the number of put into use and the gradual increase of service life,a series of problems such as gas leakage are often exposed during operation.Such problems are especially common in winter when the temperature difference between day and night varies greatly.Once there is a problem with GIS equipment,it will not only seriously affect the stable operation of the equipment,but also face great threats and hazards to the health of the human body and ecological environment.Studies have shown that although conventional detection tools and methods have their advantages of simplicity and ease,it is difficult to monitor GIS equipment in an all-round way,and it is impossible to achieve early warning and prevention of adverse accidents.Through finite element analysis,to fully understand the static characteristics of SDA524 GIS equipment under the action of multiphysics,it is helpful to prevent problems in advance,achieve structural improvement and refine maintenance and repair plans.In this thesis,ANSYS is used to simulate and analyze the global structure of SDA524 GIS equipment by finite element analysis method,with the help of this job the structure of the equipment is improved.The main research and work content of this thesis are as follows:The static analysis of the global structure of GIS equipment under unenergized condition was carried out,and the deformation and stress of the equipment as a whole were obtained,and it was found that the existence of segmented intervals had a non-negligible impact on the deformation and stress of the main busbar.The GIS main bus bar was analyzed by multiphysics coupling simulation method,considering the influence of heat transfer modes such as heat conduction,heat radiation and heat convection on the internal and external temperature distribution of the GIS main busbar,and the average temperature of the main bus shell was obtained,and it was applied as a load to the global structural static analysis under subsequent multi-working conditions.The static analysis of the global structure of GIS equipment under live high temperature working conditions and uncharged extreme low temperature working conditions was carried out,the deformation and stress distribution laws of the equipment were mastered,and the influence of segmented intervals on the main bus bar and other intervals of GIS equipment was studied.Based on the results of static analysis,the straight pipe pressure balance expansion joint is introduced to improve the structure of GIS.Through the comparison of different improvement schemes,the influence of pressure balanced expansion joint on the global structure of GIS is obtained,and the deformation and abnormal force of GIS equipment caused by segmentation interval are eliminated.