Tower Classification: Generally divided by shape into five types: Goblet-shaped, Cat Head-shaped, U-shaped, I-shaped, and Barrel-shaped; and by usage into Tension Towers, Straight Towers, Corner Towers, Reversing Towers (towers for changing wire phase positions), Terminal Towers, and Spanning Towers, etc.

According to the purpose of the towers in the transmission line, they can be classified into straight towers, tension towers, angle towers, compensation 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 turns of the transmission line, taller span towers on both sides of the intersected objects, compensation towers at regular intervals to balance the impedance of the three conductors, and terminal towers at the junctions of the transmission line with the substation structure.

Categorizing by the structural material of towers, the main types of towers used in transmission lines are reinforced concrete poles and steel towers. They are divided into self-supporting towers and guyed towers based on maintaining the overall structural stability. Tower structures come in various forms. From the transmission lines already constructed in our country, steel towers are commonly used in transmission lines with voltage levels greater than 110kV; reinforced concrete poles are typically used for voltage levels below 66kV. Tower guy wires are used to balance the lateral loads of the tower and the tension in the conductors, reducing the bending moment at the base of the tower. The use of guy wires can reduce the consumption of tower materials and lower the cost of the line. In areas with flat terrain, the use of guyed towers is more common. The selection of tower type and appearance should be calculated to ensure they meet electrical requirements while conforming to the voltage level, circuit count, terrain, and geological conditions of the transmission lines. Based on the actual situation, suitable tower types for a specific project should be chosen, and through economic and technical comparisons, the most cost-effective tower type should be ultimately selected.

Tower structure

The entire tower is primarily composed of three main parts: the tower head, the tower body, and the tower legs. For guyed towers, the guy cables are also added.

Tou Tai

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

Tower leg

The section above the tower frame is called the tower leg.

Tower

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