1. ADSS optical cable selection: The design and selection of ADSS optical cable requires confirmation of the erection path, technical index requirements, safety factor, calculation of maximum tension, selection of appropriate outer sheath, etc.
The detailed technical specifications of ADSS optical cables are based on engineering design, construction and operation requirements.
ADSS optical cables generally run in high-voltage induced electric field environments. Its outer sheath has certain resistance to electrical corrosion, which can reduce the corrosion of ADSS optical cables caused by high-voltage induced electric fields and ensure the durability of ADSS optical cables in strong electric field environments. Use period.
According to the electric field range of the optical cable application, when the optical cable is laid with a space potential not greater than 12kV, the outer sheath is made of black polyethylene sheath; when the optical cable is laid with a space potential greater than 12kV, the outer sheath is made of electric trace-resistant sheath Black polyolefin sheath.
In engineering, PE-sheathed ADSS optical cables are generally laid in places where the space potential is not greater than 12kV, and AT-sheathed ADSS optical cables are laid in places where the space potential is not greater than 25kV.
2. Selection of hanging points for ADSS optical cables: ADSS optical cables are usually laid by reusing old transmission lines. If no space is reserved for ADSS in the original line design, the selection of hanging points for ADSS optical cables can only be adapted to the existing ones as much as possible. line.
The reasonable selection of hanging points is one of the important factors for the safe operation of ADSS optical cables.
ADSS optical cable hanging points come in three forms: the upper hanging point between ground conductors, the middle hanging point between conductors and the lower hanging point at the bottom of the tower head.
(1) The electric field strength must be below 25kV. The ADSS optical cable should be in an environment with as small a field strength as possible to reduce electrical corrosion.
When laying lines with a voltage level of 110kV and below, the hanging point should be selected with a field strength not exceeding 12kV. When laying lines with a voltage level above 110kV, the hanging point should be selected with a field strength of 12~ 25kV suspension position.
(2) Ensure that parameters such as the minimum distance between ADSS optical cables and other buildings and trees, the minimum vertical distance to the ground, and the distance across from power lines comply with relevant regulations.
Generally, the windage distance of the ADSS optical cable to the crossing and crossing objects is checked based on the sag in strong winds, and the vertical distance of the ADSS optical cable to the ground and crossing objects is checked using the ice-covered sag.
(3) Ensure that ADSS optical cables and wires do not whip.
(4) Verify the strength of the tower, reduce the load on the tower, and use the low-hanging method as much as possible if the conditions are met.
(5) It is easy to construct and maintain and is not easily damaged by external forces.
