In the early stage of the project, the manufacturer is required to provide the power line field strength distribution diagram, calculation results and analysis data and description of the cable hanging point selection. The field strength of the optical cable in any operation mode is not more than 20 KV, so that the power of the optical cable is Corrosion control is within safe limits. At the same time, combined with the mechanical and physical characteristics of the optical cable and the carrying capacity of the transmission line, the choice of the hanging point is comprehensively considered.
Because our province is located in a tropical rainforest climate, surrounded by the sea, the climate is hot, the sunshine is strong, the air humidity is high, the salinity is high, and the typhoon activity is frequent from July to October every year. The power line and cable have a large wind swing effect. For the transmission line that has been running for a long time, special consideration should be given to the force of the tower in the harsh weather conditions after the ADSS cable is attached and hanged, and the influence between the power line and the power line. The path with a large amount of allowance should be selected as much as possible. If the margin is small, the tower should be checked and strengthened.
In addition, for large-scale ADSS cable erection projects, in the production process of optical cables and before leaving the factory, conditional construction can carry out sampling and factory inspection of the products supplied. According to the need, the physical, mechanical and optical characteristics of the optical cable are comprehensively tested, and the factory is required to provide the factory inspection item list and related instruments in advance.
After the optical cable arrives at the site, the safety site should be placed as required to avoid sun and rain. At the same time, the construction unit, the manufacturer and the construction unit should be organized to conduct on-site screening. First check the appearance, visually check the appearance of the cable, whether the cable package is intact, whether the cable sheath is damaged or squeezed, and whether the end package is good, and then check the product certificate and the loading record.
In the pre-construction period, each cable-laying yard should be selected in advance to ensure that the location of the site is selected to meet the operational safety of the construction equipment and meet the distance requirements of the cable deployment point. For the follow-up optical cable connection work, we must also check and prepare the welding machine, cutting knife, wire stripper and other instruments, tools and related accessories in advance, do the dust removal and accuracy verification work, and do not bring the problem into the construction. on site.
At the same time, it is required that the connection of the ADSS cable must be selected on the tension tower of the transmission line, and must not be connected in the middle of the line; and the number of connections of the cable should be reduced as much as possible to avoid increasing the construction difficulty and increasing the full attenuation. The construction of ADSS cable is basically the same as the construction of overhead power line, but the cable has its special technical requirements. It should adopt the standard installation method as much as possible, using the installation machinery and tension release technology.
Firstly, put the traction rope manually, and take protective measures to cross the roads, bridges, rivers, woods, farmland, buildings, etc. along the line. Special crossings should be set up with support frames and sent by special guards. For power lines spanning 10KV and above. It is necessary to go to the power supply department to handle the power outage, and the site must also be inspected and grounded.
The installation of ADSS cable is basically divided into two steps: the first step is to apply a cable, the wire is tight, the fitting is installed, the bridge is formed; the second step is fiber fusion, and the fiber optical characteristic test. In order to ensure the quality of the connection, according to the climatic conditions of our province, the construction period of the ADSS cable should be selected as much as possible during the winter when the rain is low. Generally speaking, the fusion of the optical cable should be completed on the same day after the completion of each wiring.