Tower Classification: Generally divided by shape into five types: Goblet-shaped, Cat Head-shaped, U-shaped, I-shaped, and Barrel-shaped. By application, they include Tension Towers, Straight Towers, Corner Towers, Position Exchange Towers (used for changing wire phase positions), Terminal Towers, and Spanning Towers, etc.

According to the purpose of the tower in the transmission line, they can be categorized into straight towers, tension towers, angle towers, shifting towers, span towers, and terminal towers. Straight towers and tension towers should be established in the straight sections of the line, angle towers at the turning points of the transmission line, high span towers on both sides of the intersected objects, shifting towers set at regular intervals to balance the impedance of the three conductors, and terminal towers at the connection points between the transmission line and the substation structure.

Tower structures used in transmission lines are mainly reinforced concrete poles and steel towers, categorized by their structural materials. They are divided into self-supporting towers and guyed towers based on maintaining overall structural stability. Tower structures come in various forms. Looking at the transmission lines already constructed in our country, steel towers are commonly used in transmission lines with voltage levels greater than 110kV, while reinforced concrete poles are typically used for voltage levels less than 66kV. The guy wires on towers are used to balance lateral loads and wire tensions, reducing bending moments at the tower base, and can help decrease material consumption and lower the cost of the line. Guyed towers are more commonly used on routes in flat terrain. The selection of tower type and appearance should be based on calculations that ensure compliance with electrical requirements while considering the voltage level, circuit count, terrain, and geological conditions of the transmission line. A suitable tower type for a specific project should be chosen based on practical conditions and economic-technical comparisons, ultimately selecting a type that is both economical and reasonable.

Tower structure

The entire tower is mainly composed of three major parts: the tower head, the tower body, and the tower legs. For guyed towers, the guy wire section is also added.

Tou Tai

The tower section changes abruptly upwards from the tower leg (forming a zigzag line), with the above part being the tower head. If there is no abrupt change in section, then the part above the lower crossarm is considered the tower head.

Tower leg

The section above the tower frame is referred to as the tower leg.

Tower body

The section between the tower leg and tower frame is called the tower body.