How to choose the location of the adss optical cable hanging point.
With the rapid development of the power grid, the grid structure of the power communication network continues to grow, and the power special optical cable is widely used. Commonly used power special optical cables include adss, opgw, gwwop and ad-lash.
The opgw optical cable is suitable for use in new high-voltage transmission lines. If it is used on an existing line, the original ground wire needs to be replaced. The review and calculation of the tower structure during the design process is quite complicated. can implement.
The gwwop optical cable is wound on the overhead ground wire, which can be implemented only after a power outage is required for the running line, and it is easily damaged by external forces. The ad-lash optical cable can be bundled on the ground wire or the phase wire (below 35kV), and it can also be implemented if the power is cut off for the running line.
The reliability of ADSS optical cable is comparable to that of ADSS optical cable, but it can be implemented without power failure on high-voltage transmission lines, and can be flexibly used on new lines and operating lines.
Factors affecting the selection of ADSS optical cable hanging point The voltage level of the transmission line, the position of the phase wire and the ground wire, the structure of the tower, and the clearance requirements all restrict the selection of the ADSS optical cable hanging point. Adss optical cables are generally used on transmission lines of 220kV and below, which require high insulation and electrical corrosion resistance. When the electric field space potential is higher than 12kV, black anti-corrosion material AT is required, and black anti-corrosion materials can be used for other potential occasions. Polyethylene PE sheath.
The position of the phase wire and the ground wire determines the space potential distribution. Excessively high electric field strength will cause greater electrical corrosion to the optical cable, thus affecting the service life of the optical cable. The structure of the tower is different, the selection of the main material is different, and the force of the tower is different, which affects the setting height of the hanging point. Adss optical cables try to avoid crossing high-voltage transmission lines, but it is inevitable to cross 10kV and below power lines, operator communication optical cables, etc.
From the various influencing factors described above, the hanging point of the ADSS optical cable should mainly consider the strength of the electric field, the safe distance between the optical cable and the ground, and the strength of the tower itself. If the Adss optical cable is installed under the high-voltage transmission line and it is very close to the iron tower, the adss optical cable will work in this environment for a long time, and it will inevitably be polluted by some rainy weather on the surface of the optical cable, and power generation may occur. directly lead to surface damage. The hanging point of the fixed adss optical cable should be selected to pass through the position where the electric field strength is relatively small.
Through the explanation, I believe that you have a new understanding of the choice of the location of the adss optical cable hanging point. If you are not very clear about other optical cable knowledge, you can contact us if you want to know or consult.
