Overhead lines are transmission systems that use the placement of cables on poles or masts on the surface of the earth. They have their advantages and disadvantages that affect their use in various situations.

Advantages of overhead lines

Overhead lines are attractive in many applications, including the transport of electricity and telecommunications. Why? Here are their advantages:

• Costs and availability: One of the main advantages of overhead lines is their relatively low price of installation and maintenance. Overhead cables are cheaper than underground wiring, and materials and equipment, such as roles to distribute cables and ladder to the overhead line, are widely available.
• Fast installation: Overhead lines can usually be installed much faster than underground cabling. This is particularly beneficial in the event of a failure when it is necessary to quickly restore the power supply.
• Easy diagnostics and repair: in the event of damage or failure of overhead lines, the problem is easier to diagnose and repair. The cables are visible and available, which makes it easier to locate the problem.
• Good performance in dry conditions: overhead lines work well in dry climates, where moisture is not a problem.

Disadvantages of overhead lines

Overhead lines, although they have numerous advantages, also have their disadvantages, which are worth considering. Here are some of the main defects of overhead lines:

• Susceptibility to weather conditions: overhead lines are susceptible to damage caused by weather conditions such as wind, snow, hail or rain. In extreme cases, there may be power breaks.
• Aesthetics and environment: in some places, especially in urban areas or with a lot of aesthetic value, overhead lines can be considered unsightly and disturbing the landscape. In addition, the installation of overhead lines can affect the natural environment.
• Power transmission restrictions: Compared to underground cables, overhead lines have restrictions on power transmission, especially at longer distances. Long overhead lines can generate energy losses in the form of heat.
• Safety: overhead lines can pose a potential threat to people and animals, especially if they are damaged or loaded by branches or ice. It is necessary to maintain appropriate intervals from the line.

To sum up, overhead lines have their advantages, such as low costs and quick installation, but also disadvantages, such as susceptibility to weather conditions and aesthetic restrictions. The choice between overhead lines and underground cabling depends on the specific situation, local regulations and requirements and costs. It is worth remembering that overhead lines consist of a whole series of elements that must be properly selected and present the right quality of workmanship.

Elements of overhead lines

Elements of overhead lines are various components and tools that are used for the construction, maintenance and operation of transmission systems based on cables hung on poles or mast. Here are some key elements of overhead lines:

• The cables are the same conductive or isolated electrical or telecommunications cables that send signals or energy between different points in the transmission system.
• Piles or masts are constructions that support the wires of overhead lines. They can be made of wood, metal or concrete, depending on local conditions and requirements.
• Insulators are used to insulate electrical cables from poles or masts. They help avoid current flow through load -bearing constructions.
• The clamps and handles are used to attach the wires on poles or mast. They ensure stability and safety of wires.
• The tensioning components are used to control the voltage and stress of the cable to keep them in the right position and prevent excessive stretching or loading.
• A roll for developing cables is devices used for controlled folding and rolling of cables during installation or repair of overhead lines. They help in maintaining order and avoiding cable entanglement.
• The rope roller is used to drag ropes or cables over a long distance, for example when building new overhead lines or replacement of damaged wires.
• The ladders to the overhead line are specialized ladders designed to work on poles or masts. They allow employees to access cables for inspection, maintenance or repair.
• The joints are elements enabling a flexible connection between the wires or between the wire and the pole, which helps in the absorption of stress and vibration.
• Insulated tools - employees using tools at work at overhead lines often use isolated tools to avoid accidental short circuit with electric wires.

These elements of overhead lines are crucial for the functioning of transmission systems and ensure the security and reliability of these installations.