1. Lightning protection for straight optical cable lines
①In the local grounding method, the metal parts in the optical cable should be connected at the joints, so that the reinforcing core, moisture-proof layer and armoring layer of the optical fiber cable in the relay section should be connected;
② According to the regulations, the moisture-proof layer, armor layer and reinforcing core should be electrically disconnected at the connector of the optical cable, and they should not be grounded, and should be insulated from the ground. The difference in the impedance of the lightning drainage line and the metal component of the optical cable to the ground causes the lightning current in the ground to be introduced into the optical cable by the grounding device.
Ii. Lightning protection for overhead optical cables
The overhead suspension wire should be electrically connected and grounded every 2km. When grounding, it can be directly grounded or grounded by a suitable surge protection device. In this way, the hanging wire has the protective effect of the overhead ground wire.
Ⅲ. Lightning protection after the optical cable enters the terminal box
The terminal box should be grounded. After the lightning current enters the metal layer of the optical cable, the terminal box grounding can quickly release the lightning current and play a protective role. The buried optical cable is equipped with an armor layer and a reinforcing core, and the outer sheath is a PE (polyethylene) sheath, which can prevent corrosion and rat bites.
The above are the lightning protection measures for optical fiber cables. Please protect your optical cables when the thunderstorm season is approaching.
