The main factor of any electrical power transmission line is transmission tower. The Main parameters of high voltage transmission lines are mainly depend on voltage level. There are different types of towers use for electrical power transmission lines. The major types of Transmission towers can categorize as bellow.
1. Suspension Tower
2. Tension Tower
3. Transposition Tower
4. Special Tower
Following are the types of transmission tower types which are widely used by considering the technical background. These transmission types are mainly classified according to its unique features and different applications on electrical power transmission. Transmission line tower designers have been endeavouring to develop tower with such shapes wich blend with the environment. Normally the tower shapes are being used with conservation environmental attraction .The highest attention and the pubic become more and more conscious of the detrimental effects to transmission line towers on the land.
Towers may be self-supporting and capable of resisting all forces due to conductor loads, unbalanced conductors, wind and ice in any direction. Such towers often have approximately square bases and usually four points of contact with the ground.
A semi-flexible tower is designed so that it can use overhead grounding wires to transfer mechanical load to adjacent structures, if a phase conductor breaks and the structure is subject to unbalanced loads. This type is useful at extra-high voltages, where phase conductors are bundled (two or more wires per phase). It is unlikely for all of them to break at once, barring a catastrophic crash or storm.
A guyed mast has a very small footprint and relies on guy wires in tension to support the structure and any unbalanced tension load from the conductors. A guyed tower can be made in a V shape, which saves weight and cost.
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