Tower Classification: Generally divided by shape into five types: Goblet-shaped, Cat Head-shaped, U-shaped, I-shaped, and Barrel-shaped. By application, they are categorized as Tension Towers, Straight Towers, Corner Towers, Reversal Towers (towers for changing conductor 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, phase shift 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 shift towers 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. They are divided into self-supporting 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, while reinforced concrete poles are typically used in lines with voltage levels below 66kV. Tower guy wires are used to balance the lateral loads of the tower and the tension of 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, guyed towers are more commonly used. The selection of the tower type and shape should be calculated to meet electrical requirements while considering the voltage level, circuit count, terrain, geological conditions, etc. of the transmission line, and choose a suitable tower type for a specific project based on actual conditions. Through economic and technical comparisons, the final selection of an economically reasonable tower type should be made.

Tower structure

The entire tower is primarily 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 abruptly changes (forms a zigzag) upwards from the tower leg; the part above this change is the tower top. If there is no abrupt change in the section, then the part above the lower horizontal brace is considered the tower top.

Tower leg

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

Tower structure

The portion between the tower leg and the tower frame is referred to as the tower body.