Analysis Of The Design And Application Conditions Of Prefabricated Substation Box

The prefabricated substation is an integrated,compact,easy-to-install,and maintainable power equipment,whose primary function is to convert high-voltage electrical energy into low-voltage electrical energy.This article takes a prefabricated substation in Qinhuangdao as the research object and conducts calculations and analyses in terms of box design,hoisting analysis,transportation,and static force.According to the local natural weather conditions,the substation is designed in terms of overall dimensions of the enclosure,base layout,column selection,and top cover for wind and snow protection.The designed structure is then assembled as a whole.For the factory hoisting condition,a dedicated hoisting tool structure is designed and optimized to reduce the equivalent stress value by 46.29% and the deformation amount by 46.27%.Theoretical calculations and finite element analysis found that the hoisting angle’s impact on the hoisting tool structure follows the expected trend,and the hoisting angle should be selected within the range of 30-60°.Theoretical calculations show that a hoisting speed of 1m/s will not damage the substation door and electrical equipment,and the stress deformation analysis results of five selected paths meet the allowable stress,but an increase in hoisting speed will increase the risk of damage to the enclosure structure.Research on the transportation of the prefabricated substation enclosure is completed,establishing models of the transport vehicle,speed bump,expansion joint,and uneven high-speed road surface,and conducting kinematic simulation analysis for the above conditions.When the vehicle speed is 20km/h passing through the speed bump,the vertical acceleration is the largest.A finite element analysis is performed on the most intense section,and the maximum stress value of the substation enclosure structure is 63.52 MPa,and the maximum deformation is 1.0242 mm,which will not cause damage to the enclosure structure.The study found that under the action of wind load and snow load alone and combined,the wind and snow load resistance strength of the prefabricated substation enclosure model is lower than the allowable stress of the material,indicating that it has good wind and snow resistance,and the strength of the enclosure structure under wind and snow load meets the design requirements.The wind load fluid-solid coupling study of the enclosure structure is designed,and the results show that the values are close to the directly applied load values,with slightly different stress deformation positions.An anti-seismic finite element analysis is proposed for the prefabricated substation enclosure framework structure model,using modal analysis to obtain the first 12 natural frequencies of the substation enclosure and analyzing the deformation degree of the first six modes of vibration.The analysis shows that except for the first mode,the modal natural frequencies are not within the range of the earthquake wave’s dominant frequency,so the prefabricated substation enclosure will not generate resonance under earthquake action,and the deformation will not cause damage to the structure.To study the seismic resistance of the prefabricated substation enclosure under a magnitude 6 earthquake,earthquake acceleration response spectra are applied in the X,Y,Z,X+Z,and Y+Z directions.The research results show that the impact of earthquakes in the vertical direction is smaller compared to the horizontal direction,and the length direction is smaller compared to the width direction.