Substation structure refers to the general term for the main supporting structures of outdoor conductors and equipment in substation and transformer stations. It is determined based on the voltage level, scale, equipment layout, construction and operation conditions, as well as the local climatic conditions of the substation. Due to the electrical properties, different voltage levels require specific distances between conductors, from conductors to ground, and from conductors to structures, thus the substation structure is characterized by tall columns and thin cross-sections, making it a high flexibility structure.

Its applications are categorized into entry-line racks, busbar racks, gate racks, corner racks, transformer assembly racks, etc., as well as single pole equipment supports.

Form classification includes commonly used structures such as AH-type in/out line structures, A-type with lightning rod support in/out line structures, A-type structures, Aח-type structures, type structures, corner structures, large character structures, and structures with pull-line in/out line connections, etc.

By classification of structural load-bearing conditions, the structures include: intermediate structures, terminal structures, and tension line structures.