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

According to the function of the tower in the transmission line, they can be classified into straight towers, tension-resistant towers, angle towers, phase-shifting towers, crossing towers, and terminal towers. Straight towers and tension-resistant towers should be established in the straight sections of the line, angle towers in the turning points of the transmission line, high crossing towers on both sides of the intersected objects, and phase-shifting towers set at regular intervals to balance the impedance of the three conductors. Terminal towers should be set at the connection points of the transmission line and substation structures.

Categorizing by the structural material of the 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. 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 for 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 tower base. 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 shape should be calculated to meet electrical requirements while also 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 the actual situation. Through economic and technical comparisons, the final choice should be a tower type that is both economic and reasonable.

Tower structure

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

Tou Tai

The tower section changes abruptly upwards (forming a bend) from the tower leg, 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

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