Power transmission lines traverse in various geographical areas, and the ground level is not uniform everywhere. So body extension and leg extensions will provide great strength to the transmission tower to hold the load, which applies to the power transmission tower.
Body Extensions of Power Transmission Line
Body extension is used to increase the tower height and obtain the required minimum ground clearance.
These body extensions are widely used for road crossings, river crossing, and ground obstacles.
Transmission tower heights are normally different from one transmission tower to another tower.
The major height difference is to apply by body extension and leg extensions.
Normally body extensions are applied in +3 meters,+6 meters, +9 meters, +12 meters … and +25 meters in height.
There are very few towers that exceed the body or leg extension of more than +25 meters.
Place where body extensions are higher than 25 m, the suitability is checked by reducing the span length and angle of deviation.
For the transmission lines traverse in hilly terrain, negative body extensions can be applied to tension towers by considering the economic factors.