In recent years, with the development of communication systems in my country’s power sector, ADSS optical cables have begun to be widely used. ADSS optical cable is an all-dielectric self-supporting aerial optical cable. Because the optical cable does not contain metal components, it has good anti-lightning and anti-electromagnetic interference performance, and is especially suitable for private network communication in power systems. In addition, due to its high strength, light weight, small cross-section, and ease of erection, it is often applied to the erection of lines that need to cross rivers, canyons and other complex terrain areas.
Since the optical cable is a self-supporting optical cable, it is under stress for a long time after it is erected. When the climate changes, it is often subjected to higher loads, which requires excellent tensile performance. At the same time, ADSS optical cable is an all-dielectric optical cable, which has no metal components, and its main strengthening component is expensive aramid fiber. In order to achieve sufficient tension and minimize the weight of the optical cable, it is necessary to make the tensile window of the optical cable (the maximum elongation rate of the optical cable when the optical fiber is not stressed) large enough.
The main strengthening member in the optical cable is the aramid filament. The number of aramid filaments determines the tensile performance of the optical cable, and the maximum allowable working tension depends on the use span of the optical cable and the climatic conditions (wind load, ice load) Wait). The consistency of the pay-off tension of aramid yarn is very important. If the pay-off tension is inconsistent, the length of the aramid yarn will be different and cannot be stressed together. This will reduce the tensile performance of the optical cable and affect the service life of the optical cable. The key to solving this problem is to release all the aramid filaments with the same tension as much as possible.
In the high-voltage electric field environment, the electric potential generated by the capacitive coupling between the optical cable and the phase line and the earth around the high-voltage wire may generate current on the surface of the optical cable. When the surface of the optical cable is wet, an arc may occur between the dry point and the wet point, and the resulting heat will erode the outer sheath and cause damage to the optical cable. Research shows that when the induced potential on the surface of the optical cable is less than 12KV, ordinary PE sheath material can be used; if the induced potential on the surface of the optical cable is greater than 12KV, the tracking resistant sheath material must be used.
Post time: Apr-25-2020