How to improve the effective measures of OPGW optical cable lightning resistance technology?

Among the various methods to improve the anti-lightning performance of OPGW optical cable, it is usually closely related to the density of lightning strikes, the number of lightning strikes, and the current amplitude when lightning strikes occur. The specific measures are as follows:

(1) Due to the skin effect of the conductor, the flow of the conductor current is basically on the surface of the conductor. As far as the OPGW optical cable is concerned, the induced current it receives. Or when there is a short circuit. The current flow is also concentrated on the surface of the cable and the outer layer of the cable. The conductor DC resistance of the outer layer of the optical cable is usually smaller than that of the inner layer, but the actual situation is that the outer conductor of the optical cable bears more current. In order to further improve the actual current resistance performance of the conductor. It can be used when selecting the outer diameter of the optical cable. Choose to use a conductor with a relatively large wire diameter as the outer wire diameter. With the increase of the diameter of the optical cable, its weight will gradually increase. Considering the mechanical properties and lightning protection performance of the optical cable. And the annual thunderstorm day level in the region. You can choose to use the outer diameter of the optical cable with a diameter greater than 2.7mm: in some heavy lightning areas, you can choose to use the outer diameter of the optical cable with a diameter greater than 3mm, if the outer diameter is stainless steel OPGW optical cable. The outer diameter of the central beam tube type is greater than l2mm, as far as the layer twisted stainless copper OPGW optical cable is concerned. Its outer diameter should be greater than l4mm.

(2) Use OPGW with better performance to match the conductor ground wire, so as to enhance its shunting ability. And play the role of OPGW optical cable.

(3) In areas with frequent thunderstorms or complex terrain, it is important to use small tower grounding resistors. Reinforce the number of insulators, and you can also install line arresters as far as the current situation is concerned. Among the current lightning protection measures, only the use of line arresters can reduce the lightning trip rate.

(4) As far as the outer stranded wire is concerned, it is an OPGW optical cable made of aluminum alloy, and the diameter of the reinforced single wire is 3.65mm. Even so, it may still be impossible to effectively avoid the occurrence of broken strands, so the aluminum-clad steel material OPGW optical cable is used in the outer strand. The diameter of the single wire should not be less than 2.5ram, so that it is possible to effectively avoid the occurrence of broken strands. The melting point of aluminum alloy is 660qc. The melting point of steel is 1535°C, so the outer strands of OPGW optical cable should use aluminum-clad steel as much as possible. In order to increase the melting point of the cable. Or it can enhance the aluminum-copper ratio, use aluminum-clad copper with higher conductivity, and increase the thickness of the aluminum layer of the outer aluminum-clad copper wire, so that more energy will be consumed when the aluminum is melted. In turn, it can protect the inner copper wire. Guaranteed strand strength.