The editor of this article mainly tells you how to fix the top of the OPGW optical cable architecture. The OPGW fiber optic cable is a fiber optic composite ground wire. It has dual functions of grounding and communication. Therefore, it is necessary to balance the needs of both applications in the installation. According to the installation requirements, the OPGW optical cable installation adopts the tension relief method as the main method. The bending radius of the optical cable laying 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 throughout the entire process, and the optical fiber in the stainless steel housing is pulled by less tension. Keeping the cable in a suspended state will also reduce wear on the pre-stranded wires on the outer layer of the OPGW cable. 1. The OPGW optical cable is fixed at the top of the structure. OPGW optical cables generally use relatively special clamps to fix the pre-twisted wires. This is done to avoid direct force damage to the optical cable. In the more traditional OPGW fiber optic cable operation mode, most of the time the electrical connection to achieve structural grounding is achieved through the use of cable suspension points or a set of ground wires. At this time, if the ground wire is passed by a large current such as after a lightning strike, the contact surface of the optical cable suspension point and the entire frame may be small, and the tension of the pre-stranded wire may become large. However, overheating due to discharge will cause direct damage, and the ground wire may fall, causing a safety accident. In order to avoid the above hidden dangers, in the installation specifications, graphic methods are specially used for explanation. There is a clear requirement to add a set of insulators between the fiber optic cable tensile members and the structure, and then make a reliable electrical connection to the frame through a matching dedicated ground wire. When maintenance personnel perform grounding (OPGW optical cable) droop adjustment operations, using this optical cable fixing and grounding mode also solves the safety issue against induced electric shock. 2. The OPGW optical cable is fixed under the optical cable. According to the requirements of the "Installation Specifications", the optical cable should be straight and beautiful, and fixed clamps should be installed every 1.5m~2m to prevent friction between the optical cable and the optical cable. It is recommended to use matching fixing clips and insulating rubber to fix the optical cable between the optical cable and the inner frame of the workstation. The distance between the frame and the frame members should not be less than 20mm. When fixing the OPGW optical cable, a fixing clamp with insulating rubber needs to be installed every 1.5m~2m to ensure that the distance between the optical cable and the frame member is not less than 20mm. In addition to preventing collisions between optical cables and towers, gap discharges can also be avoided. Risk of arc discharge external to fiber optic cables. However, because the OPGW optical cable is directly fixed to the frame support column, the capacitance between the optical cable and the frame is enhanced, which further increases the induced voltage of the optical cable. The higher the voltage level of the transmission line, the higher the frame, and the longer the distance from the OPGW optical cable, the greater the induced voltage at the lower end of the optical cable. In order to avoid the risk of personal electric shock, in addition to increasing the spacing between optical cables and frames during project implementation, the "three-point" grounding requirement for OPGW optical cables is also included in the "Installation Specifications". The above are the specific steps that the editor tells you about how to fix the top of the OPGW optical cable architecture.
