The Substation Structures

The substation framework is the support structure of incoming line, outgoing line and internal conductor. According to the layout of the frame, it can be divided into three categories: substation terminal frame/ dead-end structures, substation intermediate frame and substation Angle frame.

Substation can be divided into: load-center substation, terminal substation; Step-up substation, step-down substation; Power system substation, industrial and mining substation, railway substation (27.5KV, 50HZ); Substation of 1000KV, 750KV, 500KV, 330KV, 220KV, 110KV, 66KV, 35KV, 10KV, 6.3KV and other voltage levels; 10KV substation; Box-type substation.

There are great differences in natural conditions and economic development levels in different parts of the world, which also bring diversity to the types of power transformation structures. The main types commonly used in project are: ordinary steel structure composed of lattice beam and column with rectangular section, reinforced concrete and prestressed concrete frame with prefabricated rectangular section on site, steel tubular herringbone column and triangular section steel beam, H-frame structure and A-frame structure, large joint steel frame, small joint steel frame, full joint steel frame, etc. With the improvement of the overall economic strength of various countries and substation voltage level, in the selection of structural materials, while considering the safety, Also consider the economy of the structure, processing manufacturing and construction of fast, finished products with quality and elegant appearance, etc., in recent years, in 220KV and above grade substation frame structure, the use of steel structure more and more, the application of steel structure variable frame has been rapid development in recent years, in the selection of steel strength, in addition to the use of conventional Q235,Q345, High strength steel, such as fy-420N/mm2, has also been applied in the project and achieved certain results.

2. Characteristics of steel structure transformer frame, steel structure types of substation mainly include steel pipe herringbone structure and lattice steel structure, commonly used in several forms of herringbone column steel pipe is several curved structure, steel pipe beam axial force is small, can be approximately considered to be pure curved structure, and lattice steel column or steel beam truss members are generally axial bearing members.

3. Calculation of steel structure transformer frame

· Due to the low precision of simplified calculation of plane drawing with the large amount of work, it is seldom used at present. With the development of computer and various intermediate analysis programs, there are more and more projects that use spatial analysis programs to calculate the power transformation framework. Compared with plane calculation,

The spatial calculation is more consistent with the actual mechanical performance of the structure, the calculation results are more accurate, higher reliable design and saved material. At present, the commonly used spatial analysis programs of steel structure transformer architecture include STAAD PRO,3D3S,STS, etc.. The following is an example of STAAD PRO spatial analysis program to introduce the spatial calculation method of steel structure substation architecture.

3.1Establishment of spatial model

Generally, the substation frame can be analyzed and calculated according to the spatial framed structure and the spatial truss structure,Structural modeling should be concerned that the whole structure must be geometrically invariant,and all nodes must be stable,when the spatial framed structure is modeling all the linkages are steel connections by default, articulated frames should be concerned the release of the joint bending moment.Substation is generally composed of inlet outlet line frame, bus line frame, main converter line frame and so on.can model them separately or as a whole,For a fully combined frame, the frame is connected by a beam with or without hanging wires.

All the frames have integrated forces and interact with each other, so holistic modeling is advisable.The influence of the axial stiffness of the linkage beam should be considered in the internal force analysis of the full joint frame model.

We have an superexcellence technical team, the workers have excellent skills, the strong strength of the company, to provide our customers with quality products and help customers solve any problems encountered in the project, let us work together to forward, create a better future.