With the development of the Internet, metal is used more and more as the medium for transmitting data in the network integrated wiring, which has the advantages of high transmission rate and long distance. As we all know, metal is non-conductive and will not be subjected to inrush current, and optical cable also has good protection characteristics. The strengthening core, especially the direct buried optical cable, has an armor layer, so when the optical cable route is struck by lightning, the optical cable will also be damaged or burned.

The editor will give you a detailed description of the lightning protection countermeasures for optical fiber cables:

1. Lightning protection of straight optical cable routes

① In-office grounding method, the metal components in the optical fiber cable should be connected to the joint part, so that the reinforcement core, waterproof layer and armor layer of the wireless relay cable can maintain the connection;

②According to the regulations of YDJ14-91, the waterproof layer, armor layer and reinforcing core at the optical cable joint should be disconnected from the electrical equipment, and not grounded. Accumulation, to prevent the characteristic impedance difference between the lightning protection discharge line and the metal component of the optical cable to the ground control loop, and the large lightning current is introduced into the optical cable from the grounding equipment.

2. Aerial optical cable: The overhead cable should be grounded for protection. Every 2km to be grounded, it can be grounded immediately or grounded according to a reasonable surge protection device. In this way, the cable has the protection function of the empty ground wire.

3. After the optical fiber cable enters the terminal equipment box, the terminal box should be grounded. After the lightning current enters the metal material layer of the optical cable, the grounding of the terminal equipment box can quickly discard the lightning current, which has a guarantee effect. The direct buried optical cable has an armor layer and a reinforcing core, and the outer coat is a PE (polyethylene) grommet, which can effectively prevent corrosion and bites from flies.