An overhead power transmission pole is a special structure designed to hold the wires of overhead power lines, as well as lightning protection cables, at a given distance from each other and from the earth's surface.
Each power transmission pole is designed to perform a specific function assigned to it.
The history of the development of the overhead power transmission poles has three periods: wood, concrete and metal.
When the need arose for the transmission of electricity over long distances for the first time, it was quite logical that the most affordable material at that time was used for the construction of power lines – the wood. However, very soon its drawbacks became obvious – rotting of wood in the place of contact with the ground, weak durability and vulnerability in front of fires.
They were replaced by more durable concrete poles that are not exposed to fire, corrosion and chemicals, the only and significant drawback of which is their huge weight, that creates difficulties during transportation and installation of the poles. Also, the problem was their disposal after the poles became unusable.
And now, concrete poles are replaced by metal poles which do not have the above drawbacks.
Let's compare the two most popular types of metal poles for power lines - lattice and multifaceted.
Metal lattice power transmission poles are a classic solution for long-distance transmission of electricity. They can be safely used in areas where the air temperature goes down to 65˚С below zero.
The lattice pole is an impressive carcass made of angled rolled metal, which is assembled using bolted connections. Due to the compactness of the parts, the transportation of the lattice poles is convenient and has a relatively low cost. However, a large number of assembly elements significantly increases the installation time of such poles, which is their main disadvantage.
Anti-corrosion protection of lattice poles is carried out by hot-dip galvanizing, which allows to extend their service life by several decades.
Multifaceted power transmission poles are a new word in the organization of overhead lines, they are in great demand due to their aesthetic appearance and enhanced strength characteristics.
A significant advantage of multifaceted power transmission poles is that they require a small area for installation, in contrast to lattice poles. They are simply indispensable in tight installation conditions.
Installation of multifaceted poles does not take much time and labor costs, due to the small number of assembly units. And the cost of transportation of such poles is low, since it is carried out by placing pole sections inside each other, due to its telescopic design.
Overhead lines built on multifaceted poles are much less likely to fail than ones on reinforced concrete and lattice poles. Metal multifaceted poles are especially good for use in aggressive environments in all climatic regions.
Galvanized multifaceted poles can serve for the benefit of mankind for about 70 years.