How to choose OPGW optical cable and ADSS optical cable wiring

ADSS optical cable and OPGW optical cable are power optical cables, which make full use of the unique resources of the power system and are closely integrated with the grid structure, economical, reliable, fast and safe. The special optical cable for electric power is not easy to be damaged by external force and has high reliability. Although the cost itself is relatively high, the construction cost is low. ADSS optical cables and OPGW optical cables are installed on various power poles with different voltage levels. Compared with ordinary optical cables, they have special requirements for mechanical characteristics, optical fiber characteristics and electrical characteristics. This article mainly explains the application of ADSS optical cables.

ADSS optical cable is mainly used for information conversion of existing lines, and is widely used in transmission lines of various voltage levels. Mainly to meet the requirements of large grid sag and large span.

The characteristics of ADSS optical cable are:

1. ADSS optical cable has small diameter and light weight, which can reduce the impact of ice and wind on the optical cable, and has little impact on the strength of the grid tower;

2. ADSS adopts new materials, smooth shape design, and has superior aerodynamic characteristics;

3. Anti-electrical corrosion ADSS optical cable can reduce the electrical corrosion of optical cable caused by high-voltage induced electric field;

4. The expansion rate of ADSS can be kept constant in a wide temperature range, and has stable optical properties at low temperatures;

5. The theoretical value of fiber tension in ADSS is zero;

6. The ADSS optical cable adopts a fully insulated structure, which can be charged during installation and line maintenance, which can greatly reduce power loss.

ADSS optical cable uses high-strength aramid yarn to produce bulletproof fabric as a tensile component in the production process. Due to the selection of high-strength, high-quality high-tech materials, the weight of the ADSS optical cable is only one-third of that of ordinary optical cables, the geometric size is small, and the additional load added to the tower is very small, and it can be directly installed on the appropriate position of the electric tower. , up to 1500m. The optical cable is made of non-metallic material, which has good insulation performance and can avoid lightning strikes. When the power line fails, it will not affect the normal operation of the optical cable; the outer sheath is treated with neutral ionization impregnation, so that the optical cable has strong corrosion resistance. It can ensure the service life of the optical cable in the strong electric field; using the existing power pole tower, it can be built without power failure, and the power line can be erected on the same pole, which can reduce the construction cost.

ADSS optical cable is suitable for high-voltage transmission lines, and there is a strong electric field around it. Galvanic corrosion often leads to damage or even destruction of fiber optic cables. The current solution is:

1. Control the space potential of the suspension point of the optical cable, 110kV does not exceed 15kV, and 220kV does not exceed 20kV.

2. The resistance bushing is suitable for lines of different voltage levels, and lines of 110kV and above must be made of resistance-resistant materials.

3. For 110kV and above, anti-corona coils can be considered to effectively reduce the electric field on the surface of metal and optical cables and reduce leakage current.

4.220kV and above lines and suspension points have strong electric fields, and the anti-vibration hammer on the optical cable shell is much safer than the anti-vibration whip.