ADSS optical cable and OPGW optical cable belong to the power optical cable, make full use of the unique resources of the power system, and closely combined with the power grid structure construction, with economic, reliable, fast, safe characteristics. Power special cable is less likely to be damaged by external forces, high reliability, although its own cost is relatively high, but the construction cost is low. adss optical cable and opgw optical cable are installed on various power towers with different voltage levels. Compared with ordinary optical cables, they have special requirements for their mechanical characteristics, optical fiber characteristics and electrical characteristics.

ADSS cable is mainly used in the information transformation of the existing lines, and is mostly used in the power lines with voltage levels of 220kV, 110kV and 35kV. It is mainly to meet the requirements of large sag and large span of power transmission lines. ADSS cable features:

1. The ADSS cable is small in diameter and light in weight, which can reduce the influence of ice and wind on the cable, and its influence on the strength of the tower is also small;

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

3. The ADSS cable can reduce the electrical corrosion of the cable by high voltage induction electric field;

4. The expansion rate of ADSS can remain unchanged in the range of large temperature differences, and it has stable optical characteristics at the limit temperature;

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

6.ADSS cable is fully insulated structure, installation and line maintenance can be live operation, which can greatly reduce power loss.

ADSS cable works in high voltage transmission lines, there is a strong electric field around, electric corrosion phenomenon often lead to cable damage or even damage. Current solutions are:

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

2. In different voltage levels of the line, the priority is to use the anti-mark jacket, 110kV and above the line must use the anti-mark material.

For 3.110kV and above lines, anti-corona coils can be considered to effectively reduce the electric field on the surface of the hardware and optical cable and reduce the leakage current.

4.220kV and above lines and strong poles and towers, anti-vibration hammer on the outer surface of the cable creepage corrosion is much safer than anti-vibration whip.

OPGW cable is affected by power outage, safety and other factors in the application of new lines. Mainly used on 500kV, 220kV, 110kV voltage grade lines, OPGW cable is characterized by the integration of overhead ground cables and communication cables on high-voltage power lines into a cable, the combination of power line technology and optical cable technology, become a multi-functional overhead ground cable, both overhead cable, but also lightning rod, but also shielding line. While completing the construction of communication lines, it also completes the construction of high-voltage transmission lines, which is very suitable for new transmission lines. There are three main types of common OPGW structures, which are steel pipe type, aluminum pipe type and aluminum skeleton type.

The characteristics and applicable environment of OPGW cable are:

1.OPGW cable is metal armored, which has no effect on high voltage scar corrosion and degradation;

2.OPGW cable must not be live during construction, and the power failure loss is large, so OPGW cable should be used in the new high-voltage lines above 110kV in general;

3. High voltage more than 110kV line, the file distance is large (generally above 250M);

4. Easy to maintain, easy to solve the problem of line crossing, and its mechanical characteristics can meet the line crossing.

The main fault in the OPGW optical cable application is the broken strand caused by lightning strikes, and the current solutions are mainly:

1. Develop a new type of lightning-resistant outer material. In 2001, Finland developed a high lightning resistance OPGW, the outer material uses a high-grade galvanized steel wire and aluminum tubes to protect the optical fiber, high-grade galvanized steel requires more energy to melt under lightning strikes.

2. The outer strand wire should be aluminum clad steel wire as far as possible, and the thickness of aluminum clad steel wire should be increased.

3. Try to increase the design air gap between the outer strand and the inner strand to avoid internal heat transfer.

4. Under the same material, use a larger outer strand diameter. After the material and structure of OPGW cable are determined, its lightning resistance characteristics are also determined.