Structural Design And Analysis Of Sail Shaped Joint Wire Substation Framework

Substation framework is an important structure in substation,which is mainly used to hang all kinds of wires inside and outside substation.Although the kinds of framework are various and the technologies are mature,the disadvantage of occupying large area still exists.With the national urbanization development,the costs of substation are increasing year by year because of the high land prices.Thus it is necessary to change the previous arrangement of the wires to compress their distance,which helps to reduce the use of lands.Inspired by the double-layer outlet framework,the sail shaped joint wire substation framework is designed innovatively for outdoor GIS substation.Combined with the optimization of professional electrical distribution equipment,the layout of the wires is changed from the traditional horizontal arrangement to the vertical arrangement.Compared with the conventional structure,the occupied area of the new structure is reduced by 50%.The wire tension of single-span structure is doubled because the vertical outlet arrangement is more compact than traditional horizontal outlet arrangement.So the bar arrangement in the framework is particularly important.The artificial density method of continuous structure topology optimization is used to optimize the layout of the sail shaped framework.The optimization model is simplified as a plane by using the frame column as the contour.The reasonable displacement constraint condition is set up,and the minimum volume is defined as the optimization target.The optimal arrangement in the plane is obtained by keeping all the units above the threshold values of specified density.In view of characteristics of the three-layer framework,the influence of the two kinds of end braces on the displacement of the frame is studied and optimized.The type of top joints of the conventional structure and new-style structure is compared and analyzed.Considering the economy,safety and quality of steel structure,a new beam-column joint structure is put forward.Based on the layout and joint design,the finite element model of the whole structure is established.For different combinations of load conditions,the most unfavorable stress ratios of each component are calculated.The sections of circular steel pipes are chosen according to the structural mechanical properties and requirements of steel structure,and the flanges of the steel pipe are also selected.The mechanical properties,such as load conditions,reaction force,stress ratio,displacement and buckling coefficient of the new structure,are analyzed.Based on the results of linear buckling instability,the nonlinear instability of the frame under the load of the lateral wind is analyzed.The Multi-Ritz vector method is used to calculate the fundamental frequency and vibration mode of the structure.The seismic response spectrum is used to check the strength and stiffness of the structure under earthquake action.The three dimensional finite element models of the beam-column joints are established,and the stress and deformation are analyzed under the working conditions of control.The results show that the sail shaped joint wire substation framework is safe,reliable,economical and reasonable.