Detailed Explanation Of ADSS Optical Cable Hardware Fittings

ADSS Optical cable hardware fittings selection and installation are one of the three key technologies, which determine whether it can use its own reinforcing components to withstand its own weight in addition to whether it can also carry external loads, in the high-voltage electric environment can maintain good mechanical that the cable maximum running tension, average running tension and ultimate tensile strength.

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Therefore, this article will introduce when the fiber optic cable is installed in the power tower on the overhead use, the use of what kind of matching fittings will be fixed in the tower to get the best mechanical properties and service life.

To learn about the mechanical design of ADSS fiber optic cables, please refer to the guide Introduction of ADSS Fiber Optic Cable.

To learn more about determining the suspension points of ADSS cables, please refer to the guide Application of ADSS Fiber Optic Cable In Power Communication Network.

Preformed Helical Tension Clamp

ADSS preformed tension clamp, also called strain clamp or dead-end clamp, is mainly used for overhead self-supporting ADSS fiber optic cable line fixing, anchoring, generally installed in the terminal tower, tight line tensioning tower, corner tower and other locations.

Each set of preformed tension clamp includes inner wire, outer wire and pulling ring.

Preformed tension clamps on the wire (cable) grip can reach the wire (cable) limit tensile strength (R.T.S) of more than 95%, no stress concentration and vibration stress, the cable to play a protective and auxiliary vibration damping effect.

Single Layer Tension Clamp

ADSS single layer tension clamp, similar to the role of preformed tension clamp. Mainly used for 50 to 200 m short span of the corner, tensioning, terminal and other towers, not only for overhead fiber optic cables but also can be used for overhead wires, wires and other anchor installation and fiber optic cable construction for traction wire clamps. It is simple structure, quick and easy installation.

Single-layer tension clamp is composed of pre-stranded wire, pulling ring, U-shaped ring and so on.

Single-layer tension clamp can also be manufactured according to the application and the user’s requirements by selecting aluminum-coated steel wire or galvanized steel wire material.

Preformed Suspension Clamp

ADSS preformed suspension clamps are mainly used in overhead self-supporting ADSS cable lines, for hanging fiber optic cables, similar to the role of ordinary suspension clips. It is recommended to be used in environments where the corner of the line is ≤30º.

Preformed suspension clamps are composed of internal stranded wire, external stranded wire, rubber inserts, suspension clamps (shells), etc.

Preformed suspension clamps can provide a reasonable distribution of very low static stresses for fiber optic cables, and improve the ability to withstand dynamic stresses (such as vibration or dance), with a holding force of up to 10% to 20% of the ultimate tensile strength (RTS) of the cable.

Secondly, the preformed suspension clamp not only effectively protects the fiber optic cable, but also its smooth contour profile makes corona discharge and electromagnetic loss greatly reduced, can make no rigid contact (flexible grip), so that wear and tear is reduced to a minimum, but also rely on the clamp’s good toughness, extreme fatigue resistance and corrosion resistance to enhance the safe use of fiber optic cables for a long period of time.

Double Preformed Suspension Clamp

ADSS double preformed suspension wire clamps, also known as double-pivot suspension clamps, which in addition to all the general performance of single-suspension wire clamps, are mainly used for long-distance overhead ADSS cable lines across rivers and canyons, such as more than 800 meters and the angle of 30 ° ~ 60 ° on the tower.

Double preformed suspension clamp consists of inner wire, outer wire, rubber insert, suspension clamp, hanging plate, triangular joint plate, etc.

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The fiber optic cable is fixed and protected by double pivot support, which ensures the safe and reliable operation of fiber optic cables in long span and large corner environments.

Mechanical Suspension Clamp

Short Span preformed suspension clamps are a type of preformed suspension clamps, between tangent clamps and preformed suspension clamps. It is suitable for straight towers with line distance between 100 and 200 meters and line angle below 15º. The breaking strength of the fixture is ≥40KN.

Mechanical suspension clamps are composed of reinforced pre-stranded wires, rubber inserts, shells, U-shaped rings and so on.

Mechanical suspension clamps have the convenient characteristics of tangent wire clamps, due to the addition of preformed reinforcement layer, but also enhance the cable to a certain degree of resistance to dynamic loading capacity.

Tangent Clamp

Tangent clamp is a kind of straight line tangent clamp, mainly for small span overhead fiber optic cable to provide lightweight, simple, low-cost protection and installation of cable clamps, especially for the construction and transformation of urban communication network needs. It is mainly used for the installation of fiber optic cables on short-span linear towers under 100 meters, or towers with a corner less than 15º.

Each set of tangent cable clamp consists of shell, rubber insert, bolt, nut, washer, etc., breaking strength ≥ 40KN.

Preformed Tangent Clamp

Preformed tangent clamps are mainly used for straight towers on lines with a pitch of less than 75 meters.

Preformed tangent clamps consist of a preformed wire clamp leg, a collar, and a right-angle hanging plate.

Preformed tangent clamp and tangent clamp role are similar, but its installation is simpler. Installers do not need special tools, with bare hands can be installed smoothly, and it is easy to ensure the quality of installation, and light weight.

Anti-corona Ring

Anti-corona ring is mainly used in 220KV above and transmission lines and ADSS fiber optic cables erected on the same tower. Since the fiber optic cable and the preformed fittings are located in a high electric field space, the end of the preformed fitting is susceptible to corona discharge, which threatens the safe operation of the fiber optic cable.

Anti-corona rings can greatly improve the electric field state of the end of the pre-stranded wire, reduce the corona on the cable produced by the corona corrosion, to extend the service life of the cable.

Summarize

When using aerial fiber optic cables for long distance network laying, we are not only concerned about the structure and performance design of fiber optic cables, the calculation and installation of suspension points, but also what kind of supporting fittings are used to assist fiber optic cables to maintain high mechanical properties under different usage environments is also one of the key points to be considered for backbone network laying.

ADSS / OPGW accessories are a range of hardware components used in the installation and maintenance of All-Dielectric Self-Supporting (ADSS) fiber optic cables and Optical Ground Wire (OPGW) cables. They are designed to provide a secure and reliable way to anchor, suspend, and protect ADSS cables in overhead applications.

The specific ADSS / OPGW accessories that are required for a particular installation will depend on the length and configuration of the cable, the type of poles or structures that are being used, and the environmental conditions.

Common ADSS / OPGW Accessories

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