Tower Classification: Generally divided by shape into five types: Goblet-shaped, Cat's Head-shaped, U-shaped, T-shaped, and Barrel-shaped. By application, they are categorized into Tension Towers, Straight Towers, Bend Towers, Position Exchange Towers (for replacing wire phase positions), Terminal Towers, and Crossing Towers, etc.

According to the purpose of the tower in the transmission line, they can be classified into straight towers, tension towers, angle towers, phase-shifting towers, span towers, and terminal towers. Straight towers and tension towers should be set up along the straight sections of the line, angle towers at the bends of the transmission line, higher span towers on both sides of the crossed objects, phase-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.

Categorizing by the structural material of the towers, the main types of towers used in transmission lines include reinforced concrete poles and steel towers. These are divided into self-standing towers and guyed towers based on maintaining the overall structural stability. The structural forms of towers are diverse. From the transmission lines already constructed in our country, steel towers are commonly used in transmission lines with voltage levels above 110kV; reinforced concrete poles are typically used for those below 66kV. Tower guy wires are used to balance the lateral loads on the tower and the tension in the conductors, reducing the bending moment at the tower base. Using guy wires can decrease the consumption of tower materials and lower the cost of the line. Guyed towers are more commonly used in flat terrain areas. The selection of tower type and appearance should be based on calculations to ensure they meet electrical requirements while also conforming to the transmission line's voltage level, circuit count, terrain, and geological conditions. Combined with the actual situation, suitable tower types for a specific project should be chosen through economic and technical comparisons, ultimately selecting a cost-effective tower design.

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 (forming a bend) from the tower leg; the portion above this is the tower head. If there is no abrupt section change, then the portion above the lower cross arm is considered the tower head.

Tower leg

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

Tower structure

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