Design And Mechanical Analysis Of 110kV Substation Framework

Framework is the main structure of substation.The framework occupies about 50% of the total area of the whole substation,which is used to support the power equipment and withstand wire tension.The framework plays a decisive role in the safe and stable operation of the equipment,so the frame design is also one of the emphases of substation engineering design.So far,the conventional framework technology has been very mature and widely used.The disadvantage is that the structure occupies a relatively large area,and the utilization degree of land resources is relatively low,which increases the land acquisition cost of the project and the related civil construction cost of substations.When the substation is faced with the realistic problem of expansion,how to adjust measures to local conditions to carry out the substation design is particularly important.It is a hot topic to optimize the compact and lightweight frame structure in the industry,and it's also a subject to be solved continuously.In order to improve the structure type of the conventional substation framework,a new kind of 110 kV cross bracing substation framework is designed.Both of the end bracings of the conventional framework are combined to a new cross structure and arranged in the middle of the frame.So the occupied area of the framework is reduced.In the design of the bracing,we use the density method of the continuous structural topological optimization to optimize the model,and reasonable displacement constraints are set,and the volume minimization is regarded as the optimization objective.Finally,the optimal layout of diagonal brace is obtained.Based on the optimized frame type,the finite element model is established by using Midas/Gen,the reasonable load condition is set up,and the stress and displacement of each member of the structure are calculated.After a series of calculations,the steel section size of the frame column and beam is optimized,and the substation framework design proposal is determined.The structural types of two kinds of different bracing schemes are calculated and analyzed for the frame with oblique brace at the end of the structure and the cross-braced frame between columns.The mechanical performance of the frame with different structural types is compared.Then,the static and dynamic performance of the frame with intermediate cross braced is analyzed,and the strength,stiffness and stability of the frame are checked by the data of the supporting reaction force,stress ratio,buckling coefficient and so on.The multiplex Ritz vector method is used to calculate the fundamental frequency and mode participating mass of the structure.The seismic design response spectrum method is used to check the strength and stiffness of the structure under seismic action.The results show that the cross bracing substation framework is safe and reliable.The design meets national and industry related technical standards requirements,which can be used as reference for similar structure design.