The impact of heat on the optical fiber unit

"Layer stranded cable core + aluminum" in Optical unit: the structure of the optical fiber unit is to use ordinary cable cores, tubes formed in the outer layer to increase the early OPGW fiber optic cable unit. The optical fiber unit of the manufacturing process, the ordinary cable cores, and surface defects in the tubes can be repaired, so the optical fiber unit manufacturing costs low. However, the practical application of the optical fiber unit found in some of the problems have been eliminated in developed countries in Europe and America, its structure inherent shortcomings.

As the optical fiber cable core unit of the ordinary cable cores, especially for the outer layer of aluminum a good conductor, the wall thickness of tubes 1.5mm ~ 5.0mm, the OPGW cable short-circuit current by impact, in its aluminum tube to generate a large current, and the resulting high temperatures.

Also, because the cores are sealed in aluminum tubes, the tubes while the heat generated is very much inward transmission of the cable core directly affected by temperature, severe thermal deformation of the cable core can eventually make or break performance optical transmission fiber. To: OPGW cables under short-circuit current in shock, short-circuit current flowing in a tube when the tube outer wall temperature distribution around the state.