Features and Performance of ADSS Fiber Optic Cable
ADSS fiber optic cable is a kind of non-metallic fiber optic cable composed entirely of dielectric material and contains the necessary support system itself. It is mainly used in overhead high voltage transmission systems. ADSS fiber optic cable is a very common fiber optic cable in the market, the technology is very mature.
The fiber optic ADSS has the advantages of no metal, strong insulation, no inductivity, light weight and easy installation. It is a kind of fiber optic cable made by winding the fiber bundle on the central reinforcement and adding insulation layer, waterproof layer and other reinforcement and protection measures.
Features of ADSS Fiber Optic Cable
ADSS fiber optic cable is mainly used in the information transformation on the already built overhead electric lines. It is mainly laid on the transmission lines of voltage level 220kV, 110kV and 35kV. This fiber optic cable can meet the requirements of large drape and span of electric power transmission lines.
1. ADSS fiber optic cable is small in diameter and light in mass, which can reduce the impact of wind, rain and snow on the fiber optic cable. In addition, it has little effect on the strength of the tower.
2. ADSS adopts new materials and reasonable shape design, which makes it have superior aerodynamic characteristics.
3. The galvanic corrosion resistant ADSS fiber optic cable can reduce the galvanic corrosion of fiber optic cable by high voltage induction electric field.
4. The expansion and contraction rate of ADSS can be kept constant in a wide range of temperature difference. And at the extreme temperature, ADSS fiber optic cable still has stable optical properties.
5. The theoretical value of fiber tension within ADSS is zero.
6. ADSS fiber optic cable is fully insulated structure. Therefore, it can be operated without power during installation and line maintenance, which can greatly reduce the loss caused by power failure.
ADSS Fiber Optic Cable Electrical Performance
The choice of ADSS fiber optic cable type should first consider the electrical performance requirements. This mainly refers to the size of the space should electric field that ADSS can withstand.
This is because ADSS fiber optic cable is laid near a high-voltage line, and the space around it has an electromagnetic field. The capacitive coupling between the cable and the cable makes the fiber optic cable in a kind of space charge area. When there is fog or light rain, the surface of the outer sheath of the fiber optic cable will generate resistance.
When the space charge acts, a current flows between the sheath surface and the grounding fixture, generating heat. This causes water vapor to evaporate and a small dry band is formed on the surface of the outer sheath of the ADSS fiber, blocking the current.
When the potential difference in the dry zone reaches a certain level, an electric arc is generated. The heat generated will cause the cross-linked polymer to gradually lose its bonding force and form corrosion. This type of failure is called sheath corrosion or electric traces, in serious cases can cause fiber optic cable fracture.