Overhead ropes are an integral part of the landscape, ensuring not only electricity transport, but also affecting the reliability and efficiency of the entire system. From huge steel structures in power plants to lines running through the rural landscape, these cables play a key role in the distribution of electricity to commercial and industrial places. In this article, we will take a closer look at wires in overhead lines, analyzing their construction, types, applications and importance for the functioning of the power network.

What elements do overhead lines consist of?

Overhead lines, being a basic element of power infrastructure, consist of various components that jointly create a functional and reliable transmission network. Electric cables are the basic element of these constructions, transporting electricity from one point to another. Most often they are made of aluminum or steel, meeting strictly defined standards and standards. In the case of high -voltage overhead lines, insulated cables are also used, protecting them against weather conditions.

Insulators, along with accessories likerope handles, they play an important role in the attachment of electrical cables to support structures and ensure electrical insulation between the cables and the load -bearing structures. They are made of non -conductive materials, such as ceramics or polymers, which allows for safe operation of overhead lines.

Piles, i.e. support constructions, are the core of overhead lines, keeping the wires in the right position and providing them with the necessary support. There are cruising and strong poles, depending on their functions and loads they must bear. Estate poles, placed at the beginning and end of the line, have additional structural elements, ensuring stability and strength.

The accessories of the overhead line include various elements for attaching, connecting as well as the protection of cables and load -bearing structures. Hangers, clamps, connectors or cruising handles are only part of this rich range. In addition, identification and warning plates are installed on the poles, informing about the characteristics of the line and the threats associated with the presence of electricity. All these elements create a comprehensive infrastructure of overhead lines, ensuring not only effective electricity transport, but also the safety of users and the reliability of the entire power system.

Types of wires in overhead lines

Overhead ropes use a variety of types of wires, depending on the specifics of the line, its purpose and the requirements for insulation and mechanical strength. Equipment elements such as roller. Here are some basic types of cables used in overhead lines:

• Non -insulated (bare) cable: it is a cable without insulation of the working vein, used in power lines with different voltages.
• Insulated cable: has work vein insulation, whose electrical strength is adapted to the rated voltage of the line.
• Divinted cable: This is a single -core wire with insulation, which does not meet the requirements for the electrical strength corresponding to the rated voltage of the line.
• Full -insulated cable: it has work vein insulation adapted to the operating conditions in the overhead line, meeting the requirements for electrical strength.
• The cable is full of self -insulated self -liner: it is a cable with isolated working veins that does not have an additional load -bearing element.
• The full -insulated cable: has insulated working veins and a separate load -bearing element, which ensures mechanical stretching strength.
• Self -insulated insulated cables: all the working veins of the cable fulfill the load -bearing function and are made of aluminum wires or aluminum alloy wires.
• Cables with neutral load -bearing vein: they have a neutral vein that has a load -bearing function and is made of aluminum alloy wires, while the remaining working veins can be made of aluminum wires.
• Cables with a load -bearing element: have an additional support element made of galvanized steel wires, used to hang the cable.

The choice of the right type of cable depends on many factors, such as the rated voltage of the lines, working conditions, insulation requirements and requirements for mechanical strength. The optimal selection of the cable is crucial for the proper and reliable functioning of overhead lines.

Permissible cross -sections of cable in overhead lines

In overhead lines, the permissible cross -sections of the cable are strictly defined in accordance with the requirements of Polish standards and confirmed by the factory certificate regarding the construction and structure. Stress in overhead lines must be controlled and should not exceed certain limits. For spans without restrictions and normal levels of restrictions with the 1st and II level, normal stresses are permissible for spans with the 3rd level of restriction, reduced stress is used. To protect the cable against mechanical vibrations, it is recommended to use sufficiently small stress or damping devices. Stretching strength of aluminum cables, calculated in accordance with the relevant standards, should be sufficient to meet the load requirements, taking into account the appropriate coefficients. The maximum permissible stresses in the cable vary depending on the operating conditions and the ambient temperature, with computing stress cannot exceed the normal or reduced stress permissible for a given line.

Overhead lines are a key element of power infrastructure, enabling large -scale electricity transmission. Valuable knowledge about these issues can contribute to better understanding and management of power infrastructure, which is crucial for the reliability and effectiveness of the energy system.