Company Name: Henan Xinchaoda Cable Co., Ltd.
Contact: Manager Guo
Address: Xibaishui Village, Xitao Town, Wuzhi County
Marketing Center: 1812, Building B, Building 3, Shenglong Plaza, Zhengdong New District, Zhengzhou
What are overhead lines and cables?
Power lines installed in the air, using insulators and air insulation
The overhead line is composed of wires, overhead ground wires, insulator strings, pole towers, and ground installation.
The wire bears the function of conducting current and must have sufficient cross-section to ensure
Overhead transmission line
Maintain a reasonable flow density. The wires are all at high potential. In order to reduce the power loss and electromagnetic disturbance caused by corona discharge, the wire should also have a large radius of curvature. UHV transmission lines, because of their large guaranteed transmission capacity and high task voltage, often use split conductors (that is, multiple conductors are used to form a phase conductor. 2 split, 3 split, or 4 split conductors are most commonly used. UHV transmission lines use 6, 8, 10 or 12 split wires). The overhead ground line (also called lightning protection line) is mainly used to avoid accidents caused by lightning flashovers on overhead lines. It works with grounding installations to prevent lightning. The insulator string is a series of single suspension insulators, which must meet the requirements of insulation strength and machine strength. The number of insulators in each string is determined according to different voltage levels, and rod insulators can also be connected in series. For overhead lines in special locations, such as dirty areas, special types of insulator strings are also required. The pole tower is a secondary support structure for overhead lines, and is mostly composed of reinforced concrete or steel. The structural design is stopped according to the requirements of machine strength and electrical insulation strength.
Compared with underground transmission lines, overhead lines have lower construction costs, shorter construction periods, and are easier to maintain. Therefore, overhead line transmission is the secondary transmission method adopted since the power industry was developed. Transmission lines are usually referred to as overhead transmission lines. Via overhead lines, power stations, substations, and load points in different regions are connected to ensure the transmission or exchange of electrical energy to form power networks or distribution networks of various voltage levels.
Overhead lines exposed in the atmospheric environment will be indirectly affected by climatic conditions. A certain degree of machine strength is required to respond to changes in outside air temperature, strong storms, icing loads, and floods that can be encountered when crossing rivers. At the same time, lightning strikes, rain, wet fog, and natural and industrial pollution will also destroy or reduce the insulation strength of overhead lines and even cause power outages. Overhead lines also suffer from electromagnetic disturbances. These elements must be considered in the design, operation and maintenance of overhead lines.