Design And Mechanical Performance Analysis Of Box Body Of Box-type Substation

With the rapid development of our country’s modernization,people put forward higher requirements for the safety and reliability of power resources.As a connection point of power grid lines,box-type substations are easily affected by the external environment and mechanical factors due to long-term exposure to outdoor environments.Therefore,it is of great practical value and significance to design and study the mechanical properties of box-type substation under extreme conditions.Based on the analysis of the research status at home and abroad,this paper proposes the design requirements for box-type substations based on the unique terrain and climate characteristics of Xinjiang region,and designs the box-type substation box structure applied to Xinjiang region;according to the force characteristics of the box body.The verification of its strength has verified the rationality of the structural design.According to the climatic characteristics of the Xinjiang region,static analysis and buckling stability analysis were carried out on box-type substation cabinets subjected to wind load,snow load,and wind-snow combined load.The results show that:under the above three conditions,the maximum equivalent stress of the box is less than the allowable stress of the material,and the design requirements for the wind and snow resistance of the box are met.In the above three cases,the box will not occur.Buckling instability.For box-type substations with the same appearance and shape,there are differences in the mechanical properties under different working conditions.By calling ANSYS software with Visual Basic,a set of box-type substation windproof and.snow-resistant mechanical performance analysis software for different materials and different working conditions is designed.The wind-resistant performance of the connection between the column and the wallboard was studied,the bolt connection between the column and the wallboard was determined,and the bolt and bolt connection system models were established.The bolts were subjected to preload only and simultaneously The stress and deformation under two conditions of tension and wind load are analyzed.The results show that:in the above two cases,the maximum stress of the bolt does not exceed the allowable stress range,and there is a certain margin of stress.The bolt connection between the pillar and the wall plate satisfies the requirements of wind resistance performance.The finite element analysis software is used to optimize the supporting column section of the substation box.The optimized results show that the length of the optimized corner pillar is 175 mm and the side length of the side pillar is 140 mm.Under the conditions of meeting the performance requirements of wind and snow resistance,the quality of the corner pillars has been reduced by 12.9%,and the quality of the side pillars has been reduced by 13.51%,achieving a lightweight requirement.According to the topographical features of the Xinjiang region,the acceleration response spectrum of the 8 degree earthquake intensity is used as an excitation,and the response type spectrum analysis method is used to stimulate the box substation in the X direction,Z direction,Y direction,X+Y direction and Z+Y direction.The seismic performance was studied.The analysis shows that the maximum stress of the box-type substation under different seismic acceleration response spectra is less than the allowable stress of the material and meets the seismic design requirements.The seismic response in the horizontal direction is greater than the vertical direction,and the width direction is greater than the length direction.For box-type substations with the same appearance and shape,there are differences in the mechanical properties under different working conditions.By calling AYSYS software with Visual Basic,a set of box-type substation windproof and snow-resistant mechanical performance analysis software for different materials and different working conditions is designed.Visualization software can directly view the results of finite element analysis,shorten the analysis time and improve work efficiency.In this paper,the structural design of the box-type substation box and the analysis of its mechanical properties can provide new ideas for the design of substation box under the special environment.