The design and construction of ADSS optical cable is a comprehensive system engineering. We discuss the structural characteristics, service life and aspects of ADSS cable, and give a deeper understanding of the application of ADSS cable in a specific environment. In recent years, the construction of power system communication network has mainly been based on ADSS optical cable. It uses special insulating materials, has good insulation and high temperature resistance, high tensile strength, can be erected on the original tower of the power line, and has become the preferred special optical cable for power system networking.
The ADSS cables that have been produced can be divided into two types in terms of structure: layer-stranded type and central bundle tube type. Among them, the layer-stranded type optical cable has a FRP strengthening core inside, and the weight is slightly heavier than the bundle tube type. At the same time, because it operates in a high-voltage environment, it can be divided into AT sheath anti-corrosion type and PE sheath standard type according to the electric field strength.
The ADSS cable is erected on the high-voltage transmission line, and its general life span is more than 25 years. There are many factors that affect its life span. The main factors are:
(1) The gradient of the high-voltage induction electric field near the tower changes greatly, and the high-voltage induction electric field has strong electric corrosion on the optical cable. PE type for general 35KV and below overhead power lines, AT type for 110KV and above lines;
(2) For double-circuit towers, due to the power failure of the first circuit of the line or the transformation of the line, it should be considered when selecting the hanging point;
(3) When the line passes through the working area with salt mist and acid gas, the chemical substance will corrode the outer sheath of the optical cable, and its electric protective cover will be damaged, which is vulnerable to arc damage;
(4) The outer skin is damaged or worn due to improper construction. Its surface is easy to corrode when it is operated in a long-term high-voltage electric field, and the optical cable with a flat and smooth outer sheath can effectively reduce electrical corrosion and prolong its life.