Fixing of OPGW optical cable in Substation

According to the installation requirements, the installation of OPGW optical cable is dominated by the method of tension release. The bending radius of the optical cable must be 40 times larger than the diameter of the optical cable.

The advantage of using tension wire is that the OPGW optical cable is subject to uniform stress during the whole process, and the optical fiber in the stainless steel shell is pulled less. Keeping the optical cable suspended will also reduce the wear of the pre twisted wires on the outer layer of the OPGW optical cable.

• Fixing of OPGW optical cable at the top of the structure

At the top of its structure, the OPGW optical cable will generally use relatively special clamps to fix the pre twisted cable, so as to avoid direct stress damage to the optical cable.

In the relatively traditional OPGW optical cable operation mode, most of the time, it is through the use of optical cable suspension points or a group of grounding wires as the electrical connection to achieve structural grounding. At this time, if the ground wire is passed by large current after lightning strike, the contact surface between the suspension point of the optical cable and the whole frame may be small, and the tension of the preformed armor rod may become large. However, due to the direct damage caused by overheated discharge, the grounding wire may fall and cause safety accidents.

In order to avoid the above hidden dangers, the graphic method is specially used for explanation in the installation specification. It is clearly required to add a group of insulators between the optical cable tension member and the structure, and then conduct reliable electrical connection with the frame through the matched special grounding wire.

When the maintenance personnel perform the sag adjustment operation of grounding (OPGW optical cable), the use of this optical cable fixing and grounding mode also solves the safety problem of anti induction electric shock.