The four-split spacer rod is an important tool used in overhead transmission lines in power system

The four-split Spacer rod is an important tool used in overhead transmission lines in power system. It is mainly used to fix the spacing between split wires to prevent whiplash between wires, restrain breeze vibration and subspan oscillation. The following is a detailed introduction to the four-split spacer rod:

First, basic function and role

Fixed spacing: Ensure that the split wires are kept at a certain distance to avoid direct contact or whiplash between the wires.

Vibration suppression: Under the action of wind, ice, ice falling off and other external forces, it can effectively inhibit the vibration and secondary distance oscillation of the wire, and protect the wire from damage.

Enhance stability: Improve the overall stability of the transmission line to ensure the safe and stable operation of the power system.

Second, structure and material

Structure: The four-split spacer rod usually adopts a double or multi-plate structure and is connected to the wire through the connecting piece. Its design needs to consider the diameter of the wire, spacing and load borne and other factors.

Materials: Generally selected aluminum alloy and other lightweight high-strength materials made to meet the requirements of mechanical strength and electrical insulation. At the same time, in order to improve the damping performance, some spacers will also use silicone rubber and other damping elements.

Third, installation and maintenance

Installation position: Spacer bars are generally installed in the middle of the spacing, and one is installed every certain distance (such as 50 to 60 meters). When installing the spacer, ensure that the spacer rod is tightly connected to the conductor, and the spacing between the split wires is uniform.

Maintenance inspection: Regular inspection and maintenance of spacers, including checking whether the connector is loose, worn or broken. If the problem is found, it should be dealt with in time to avoid affecting the normal operation of the transmission line.

Four，Case analysis

Taking the case of fracture failure of spacer rod for four split wires of a 500kV transmission line as an example, it is found that the main causes of fracture are inadequate metamorphic treatment, abnormal microstructure and poor casting quality of spacer rod material ZL102 cast aluminum alloy. In addition, under the action of wind swing, waving and other loads in the running of the conductor, great stress concentration is formed at the serious defects of the spacer support, which exceeds its bearing limit, and finally causes fracture failure. Therefore, strict control and optimization of the casting process is essential to improve the quality of spacer bars.

Five，Development Trend

With the development of power system and the improvement of transmission voltage level, the performance requirements of four-split spacers are becoming higher and higher. In the future, the four division spacer will develop towards lightweight, high strength and high damping performance. At the same time, with the continuous emergence of new materials and the advancement of manufacturing processes, the design of spacer bars will be more reasonable, the manufacturing will be more precise, and the service life will be longer.

To sum up, the four-split spacer has an irreplaceable and important role in the power system. Through continuous research and innovation, it will promote the continuous progress and development of spacer rod technology