In recent years, with the development of my country's power sector communication system, ADSS optical cable has been 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, because of its high strength, light weight, small cross-section, and ease of erection, it is often used in the construction of lines that need to cross complex terrain areas such as rivers and canyons.
Since the optical cable is a self-supporting optical cable, it is under stress for a long time after erection. When the climate changes, it is often subject to higher loads, which requires excellent tensile properties. 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, the tensile window of the optical cable (the maximum elongation of the cable when the optical fiber is not stressed) must be large enough.
The main strengthening member in the optical cable is aramid wire, the number of aramid wire determines the tensile performance of the optical cable, and the maximum allowable working tension depends on the use span and climatic conditions (wind load, ice load) of the optical cable. Wait). The consistency of the aramid yarn pay-off tension 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 apply all the aramid fibers with the same tension as possible.
In the high-voltage electric field environment, the potential generated by the capacitive coupling between the optical cable around the high-voltage conductor, the phase line and the ground may generate current on the surface of the optical cable. When the surface of the cable is wet, arcing can occur between the dry and wet spots, and the heat caused can erode the outer jacket and damage the cable. Studies have shown that when the induced potential on the surface of the optical cable is less than 12KV, the 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.