It is well-known that OPGW fiber optic cable, also called fiber-optic hybrid overhead ground wire, contains the optical fiber unit for communication in the ground wire of the power transmission line. As a special optical cable dedicated to the power system, it has high strength, stable performance, and no electric corrosion. It has two functions. One is as a lightning protection line for transmission lines and provides shielding protection against lightning strikes on transmission lines. Through the composite fiber in the ground, as the medium for transmitting optical signals, audio, video, data and various control signals can be transmitted to form a multi-channel broadband communication network. Currently, it is widely used in the optical fiber communication backbone network of power systems.
However, because it is erected on the same pole as the high-voltage line and also serves as the ground wire, the problem has become an important factor affecting the safety performance of the OPGW cable. How to improve the anti-lightning performance of the OPGW cable has become one of the most severe challenges faced by the OPGW cable.
There are usually two ways used in the current operation:
Firstly, adjusting the ratio of outer strand materials in the area where lightning strikes frequently occurs, and improving the level of anti-lightning strikes on outer ACS (or AA) wire. However, there are some defects in this way, such as adding more materials, increasing the weight of the cable itself, putting pressure on the tower weighing, increasing the difficulty of construction, and increasing the production cost at the same time.
Secondly, to improve the structure of the cable and the shape of the strands, an air gap is mainly left between the outer strands and the inner strands to prevent the heat from the outer layers from being transmitted to the inner layer and the optical fibers to protect the inner layer of optical fibers.
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