Towers are mainly used for
1.Provide support to transmission line
2.Used for installing lines
3.Provide required ground clearnce
The preferable towers has low cost, less complicated structure and they looks beautiful some of transmission towers are given in figure
Types of poles
Wooden Poles
These poles are simple , cheap and made of simple insulating material (wooden) In early times wooden poles were used widely but due to their short life time(20 years) and high maintenance requirement these poles are replaced by another one's
The wooden poles use upto a voltage range of 20kv in distribution system where span(distance between two towers) is about 60meters
IN transmission lines they can be used upto 132 kv and max span will be 150 meters
The main disadvantge of wooden poles is its short life ,temperature effect and cracks makes under soil
Tubular poles
Tubular poles are very popular in the world b/c of their
1.Their mechanical strength
2.Their look
3.Their life time
Galvanized or paint put on the surface of tubular poles to increase its life
Pressed concrete Poles
These poles are also known as RCC poles
Self supporting lattice type steel tower
The best choice for transmission lines
These poles are made of steel bars these steel bars are connected in a way that Each steel bar provide support to another steel bar
These poles are 3 times expansive than RCC poles but due to their span which is much larger than other poles so they are used majorly in trnasmission system
Formula for spacing of conductors
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