Introduction
The All Dielectric Self-Supporting (ADSS) optical cables were also a big step forward in the area of power system communication networks. This article analyzes the structure of airdrops, service life and selection principles for hanging points as well as distribution trays used with ADSS optical cables (using sag tension tables), thus giving you more comprehensive knowledge on their application in context specific environments. As the development of science and technology in recent years, ADSS optical cables have become a basic or pillars of power system communication network construction with their own unique advantages.
ADSS Optical Cable Structure Characteristics
Layer-stranded and central bundle tube are the main types of optical cable for ADSS. They are of two types, the 1)layer stranded type with fibre glass reinforcement core (FRP: Fibre Reinforced Plastic), which is heavier than bundle tube. According to different electric field strength in high-voltage environments, the ADSS cables can be divided into AT sheath erosion-resistant type and PE sheath standard types. Features of ADSS optical cables
1. ADSS cable is the perfect fit for power systems, all-dielectric self-supporting aerial cables does not include any metal material inside.
2. The full insulation and high electrical erosion induce index of them ()make the overhead lines still running even through transmission length powers on.
3. ADSS cables are made of a tough anti-corrosion, high tensile strength material so they do not have to be kept taught (they can simply hang from the pole) and meet requirements for larger spans between supports at both local level poles/coaxial cable runs as well as overhead power lines.
4. The thermal expansion coefficient is low for ADSS cables which control the curvature in transporting operation temperature. They are also far lighter in weight, giving them incredibly low ice and wind loads.
Service Life of ADSS Optical Cable
The ADSS optical cable is usually laid on the high-voltage transmission line, with a life of more than 25 years in most cases. But the actual lifespan varies due to a number of factors.
1. The electric field gradient induced by the high voltage near the tower is very large, and there are strong electrical corrosion phenomena on optical cables caused by this power. Mainly PE types are used for overhead power lines of KV and below, but AT type is adopted on 110KV line.
2. For double-circuit towers, the arrangement of hanging points shall be considered for power failure or line reconstruction in one circuit.
3. In the working area of salt mist and acid gas, chemical substances inhaled by lines can cause corrosion of optical cable sheath external layer, damage to electrical protection sheathing properties，Arc should be formed with special attention after being corroded.
4. The construction is not in place and the outer sheath may corrode easily when running under a harsh high-voltage environment for a long time. The use of an optical pillar, the metal-free and smooth outer sheath can effectively reduce electrical corrosion for long life.
Selection principles for suspension points and distribution trays
Hanging Point and Distribution Tray Selection are Important for Quality of Service Life and Performance in the Benefits ADSS Optical Cables. The hanging points should be selected as to not promote cable stress and avoid areas of high electrical corrosion. Trays for distribution should support and protect the slack loops & tensions of cables, against environmental damage.
Sag Tension Table Reading
Need to know: the sag tension tables for ADSS optical cables The tables allow us to define the amount of sag and tension in the cable under load, to ensure that we can appropriately handle different loads while maintaining a safe route for cables. The accurate interpretation of these tables allows cables to be installed within safe limits, evading excessive sag which can cause operational hazard as well facilitate premature failure.
Conclusion
With the structural characteristics, durability and environmental resistance of ADSS optical cable increasingly becoming mainstream, it has been densely filled into power system networking. Adapt Aerial Optics here explains how better understanding the ins and outs of designing ADSS cables helps them to build more reliable, efficient power system communication networks. With the improvement of technology, practical application of ADSS optical cables will play an increasing role in power system communication networks.