Transmission lines are made up of many different parts, including poles, lattice structures, conductors, cables, insulators, foundations, and earthing systems. The various parts are discussed in detail below.
Poles are the supporting structure for the line. They can be wood or steel, but most often they are made of aluminum because of its lightweight and resistance to corrosion when exposed to weather conditions. The height of a pole determines how far it can reach; the higher the better. The best type of pole for reaching high-voltage lines is a monopole, which has only one tip. A dipole has two tips and a ground rod attaches to the bottom of the base pole to complete the circuit.
Lattices are used instead of poles where space is limited such as on towers. Lattices are made of crosspieces with wire strung between them to form a grid. The stringing of the wires between the crosspieces creates open areas between each set of wires. These open areas allow wind to pass through the grid while keeping electricity from escaping. The number of wires in the grid determines how high you can raise the lattice before you need to attach another layer to increase its height.
A transmission line is a network of wires used to transport electrical impulses from one location to another. Transmission lines are used to connect power plants with substations and distribution centers. They are also used within radio transmitters and receivers to control the flow of electricity to and from magnetic coils within radios.
The two main types of transmission lines are aerial and underground. Aerial transmission lines stretch out above the ground where they can be seen by passengers. These lines use large numbers of metal wires held together by rope or cable. They are easily damaged by road vehicles and high-powered electricity such as that used by power lines. Underground transmission lines are placed in trenches dug in the ground. They usually consist of thick cables of steel or aluminum covered with insulation to prevent current from flowing through the ground. Some underground lines are made of fiber-optic cable instead. This type of line uses light beams rather than electric currents to send information back and forth between its connected nodes.
Transmission lines come in different sizes, from small wires used for local power distribution to very large towers used to transmit energy over long distances. The size of transmission lines depends on several factors such as their use and location.
Transmission line towers are structures used to support overhead conductors, lightning conductors, and other accessories, allowing conductors and conductors, conductors and towers, conductors and lightning conductors, conductors to the ground, or cross-overs to maintain a safe distance from the tower structure. The primary function of transmission line towers is to distribute load between multiple lines and their supporting structures. They also provide protection for workers on the transmission line construction site.
The need for transmission line towers became evident as early as 1872 when the Chicago & Eastern Illinois Railroad was built through Indiana. Because of the hilly terrain in which this railroad was built, it was necessary to erect bridges over streams with very shallow waters. It was found that if you connect a heavy wire under these conditions, it will be dangerous for anyone to walk on. This led to the invention of the safety wire which today is used by almost all power companies in remote areas where it is not possible or practical to provide an adequate number of police officers to protect people from falling objects such as trees, power lines, and radio antennas during stormy weather.
The need for transmission line towers increased after the 1920s when many long-distance telephone companies were built across America. These telephone lines needed to be kept at a safe distance from power lines so they wouldn't be damaged by them.