adss fiber optic cable and opgw fiber optic cable belongs to the power fiber optic cable, make full use of the unique resources of the electric power system, and the electric power grid structure is closely integrated with the construction, has the characteristics of economic, reliable, fast, safe. Power special fiber optic cable by the possibility of external damage is small, high reliability, although its own cost is relatively high, but the construction cost is low. adss fiber optic cable and opgw fiber optic cable is installed in different voltage levels of various power towers, compared to ordinary fiber optic cables, on its mechanical characteristics, fiber characteristics, electrical characteristics have special requirements.

The adss fiber optic cable is mainly used in the information transformation on the constructed line, mostly applied in the voltage level 220kV, 110kV, 35kV transmission line. It is mainly to meet the requirements of power transmission lines with large droop and span. adss fiber optic cable is characterized by:

1. adss fiber optic cable is small in diameter and light in quality, which can reduce the impact of ice and wind on the fiber optic cable, and its impact on the strength of the tower is also small;

2. adss uses new materials and smooth profile design, so that it has superior aerodynamic characteristics;

3. The galvanic corrosion-resistant adss fiber optic cable reduces the galvanic corrosion of the fiber optic cable by the high-voltage induced electric field;

4. the expansion rate of adss can be maintained in a wide range of temperature difference, and its limiting temperature, with stable optical properties;

5. the theoretical value of fiber tension within adss is zero;

6. adss fiber optic cable is fully insulated structure, installation and line maintenance can be charged operation, which can greatly reduce the loss of power outage.

adss fiber optic cable work in high voltage transmission lines, there is a very strong electric field around, the phenomenon of electric corrosion will often lead to the cable damage or even damage. The current solutions are:

1. Control the space potential of the cable suspension point, 110kV not more than 15kV, 220kV not more than 20kV.

2. Prioritize the use of trace-resistant jackets for lines of different voltage levels, and be sure to use trace-resistant materials for lines of 110kV and above.

3. 110kV and above lines, can consider the use of corona coil in order to effectively reduce the electric field on the surface of the fixture and fiber optic cable, reduce leakage current.

4.220kV and above line and hanging point field strong tower, anti-vibration hammer on the outer skin of the fiber optic cable creepage corrosion is much safer than anti-vibration whip.

opgw fiber optic cable by the line blackout, safety and other factors more in the new line application. Mainly used in 500kV, 220kV, 110kV voltage level lines, opgw fiber optic cable is characterized by high-voltage transmission lines on the overhead ground and communication cable integrated into a cable, the transmission line technology and optical cable technology combined with each other to become a multi-functional overhead ground, both overhead fiber optic cables, but also lightning lines, but also shielding lines, in the completion of the construction of the communication line at the same time, but also complete the High voltage transmission line construction, very suitable for new transmission lines. There are three main categories of common OPGW structure, which are steel tube type, aluminum tube type and aluminum skeleton type.

The characteristics and applicable environment of opgw fiber optic cable are:

1. opgw fiber optic cable is metal armored, completely unaffected by high voltage trace corrosion and degradation;

2. opgw fiber optic cable must not work with electricity during construction, and the loss of power outage is large, so generally in the new high-voltage lines above 110kV should use OPGW fiber optic cable;

3. High-voltage over 110kV line, the stall distance is larger (generally more than 250M);

4. easy to maintain, for the line across the problem of easy to solve, its mechanical properties can meet the line across the big.

The main fault in the application of opgw fiber optic cable is broken strands caused by lightning strikes, the current solution is mainly:

1. the development of lightning-resistant outer layer of new materials. 2001 Finland's development of high lightning-resistant OPGW, the outer layer of material using a high-grade galvanized steel wire and fiber protection of the composition of the aluminum tube, high-grade galvanized steel requires more energy to melt under the lightning strike.

2. Try to use aluminum clad steel wire for the outer strand, and thicken the thickness of aluminum clad steel wire.

3. Increase the designed air gap between the outer and inner strands as much as possible to avoid internal heat transfer.

4. the same material, the use of a larger diameter of the outer strand. opgw fiber optic cable materials and structure to determine the use of its lightning characteristics are also decided.