During the operation of the transmission line, the vibration of the conductor is one of the hidden dangers that cause fatigue damage to the wire and failure of the metal fittings. Whether it is high-frequency and low-amplitude vibration under the action of a breeze, or low-frequency and large-scale dancing caused by strong winds, long-term accumulation will lead to broken strands of conductor aluminum strands, wear at the joints of metal fittings, and even cause major accidents such as tower tilting. Helical armor rods for overhead line, as an important component with both protection and damping functions, its method of reducing conductor vibration is not a single blocking, but through a combination of structural design and installation strategies, a systematic solution is formed from the three links of vibration energy absorption, stress dispersion, and frequency adjustment.
The use of the flexible bonding characteristics of the pre-twisted structure to absorb vibration energy is the main method to reduce the vibration of the conductor. Helical armor rods for overhead line are prefabricated into a spiral shape from multiple strands of high-strength stranded wires, which can be installed to tightly fit the surface of the conductor. When the conductor vibrates due to air flow disturbance, the spiral strand of the protective line will flexibly expand and twist with the small deformation of the conductor. In this process, the friction between the strands and the elastic deformation of the material itself will convert part of the vibration energy into heat energy consumption, thereby weakening the transmission intensity of vibration. Compared with the traditional rigid damping device, this flexible absorption method is more suitable for high-frequency and low-amplitude breeze vibration. At the same time, the flexible bonding of the guard line and the conductor avoids the local stress concentration caused by rigid contact, and further reduces the secondary damage of vibration to the conductor.
Dispersing vibration stress through precise installation location planning is an important way to improve the damping effect. The stress generated by the vibration of the conductor is not evenly distributed, but is highly concentrated at the connection site of the metal fittings, the midpoint of the conductor span, etc. These areas are also high-incidence areas of vibration damage. Therefore, when using helical armor rods for overhead line to reduce vibration, priority needs to be given to arranging guard lines in the stress concentration area. In addition, in mountainous areas with turbulent flow, the installation density of the guard line needs to be adjusted according to the direction of the air flow. The number of guard lines is usually increased in the conductor section on the windward side to further weaken the vibration caused by irregular air flow.
Combining conductor parameters and environmental conditions to select the appropriate helical armor rods for overhead line model is the basis for effective damping. Conductors of different specifications and different operating environments have obvious differences in their vibration characteristics. If the model of the guard line and the conductor do not match, not only will it not be able to play a damping role, but it may also intensify the vibration due to resonance. Therefore, before using helical armor rods for overhead line to reduce the vibration of the conductor, it is necessary to analyze the natural vibration frequency of the conductor, the maximum vibration amplitude and other parameters through professional software, and then select the material, number of strands and spiral density of the guard line accordingly. In addition, the spiral pitch of helical armor rods for overhead line needs to be accurately matched with the outer diameter of the conductor. Usually, the pitch is 8 to 12 times the outer diameter of the conductor, so that the guard line can flexibly deform with the vibration of the conductor to maximize the absorption of vibration energy.
As a professional supplier, we can not only provide B-side buyers with helical armor rods for overhead line adapted to different scenarios, but also provide full-process services from vibration analysis to solution landing. Whether your project is located in a plain area with frequent breeze or a mountainous area with high dancing, we can use professional products and services to become a partner worthy of your trust.