ADSS optical cables are used for high-voltage transmission lines, using power system transmission tower poles, the entire optical cable is a non-metallic medium, and is self-supporting suspended on the power tower where the electric field strength is the smallest. It is suitable for built high-voltage transmission lines, because it saves comprehensive investment, reduces man-made damage to optical cables, has high safety, no electromagnetic/strong current interference, large span, and is favored by the majority of power system users. It has been widely used in the communication construction of power system urban network transformation and rural network transformation.
Advantages of ADSS optical cable
1. The construction operation is simple. Eliminates the procedures of erecting poles, erecting steel stranded suspension wires and hanging pulleys on the suspension wires to lay optical cables, and can directly fly across fields, ditches and rivers just like power lines.
2. The communication lines and power lines are in a system, no matter which line fails, maintenance and repair will not affect each other.
3. Compared with the bundled and wound optical cables used in power systems, ADSS does not depend on power lines or ground wires, and is erected on a tower alone, allowing construction without power failure.
4. The optical cable has superior performance in a high-intensity electric field, and is free from electromagnetic interference, and the outer sheath made of special materials is protected from lightning.
5. The process of communication line survey and tower construction is omitted, and engineering construction is simplified.
6. The optical cable has a small diameter and light weight, which reduces the impact of ice and wind on the optical cable, and also reduces the load on the poles and supports. Maximize the use of tower resources, and it will be widely used on high-voltage transmission cables below 500KV.
Characteristics of ADSS optical cable
1. Design of single-mode, multi-mode optical fiber and integrated optical cable.
2. The sleek shape makes the optical cable have superior aerodynamic performance.
3. The all-medium fiber optic cable structure is conducive to installation and maintenance.
4. It has a wide range of temperature adaptation and a small linear expansion coefficient to meet the requirements of harsh environments.
5. Withstand leakage voltage 25KV.
6. Torque balance and aramid winding make the optical cable have extremely high tensile strength and anti-ballistic performance.
ADSS optical cable structure design and technical specifications
1. Design elements of ADSS optical cable:
A The environmental meteorological area: a wind speed b ice thickness c temperature d topography
B Power line being erected: a Rated high voltage and maximum operating voltage
b Tower type and the type and arrangement of conductors and grounding wires
c Tensile section length, standard span (represents span, maximum horizontal span, maximum vertical span)
d The maximum sag of the wire and ground wire of each tensile section.
2. ADSS optical cable technical specifications
Cable core and cable diameter
Optical cable model and weight
Tensile strength, compressive strength
Vibration and dance
Elongation and excess length
Anti-tracking of the outer sheath
Hardware compatibility
ADSS optical cable fittings
Tension clamp use:
ADSS pre-twisted wire tension clamps are mainly used for the fixing and anchoring of overhead self-supporting ADSS optical cable lines. They are generally installed in terminal towers, tension towers, corner towers, etc. Composition: Each set of pre-twisted wire tension clamp components includes: inner stranded wire, outer stranded wire, and pull ring. Users can configure and purchase other connectors according to design requirements. Features: The grip strength of the pre-twisted wire tension clamp on the conductor (optical cable) can reach more than 95% of the ultimate tensile strength (R.T.S) of the conductor (optical cable), without the influence of stress concentration and vibration stress.
Single-layer tension clamp use:
ADSS single-layer strain clamps have similar functions as strain clamps. Mainly used for 50-200m short span corners, tensile strength, terminal and other towers, not only for overhead optical cables, but also for anchoring installation of overhead conductors, pull wires, etc., as well as traction clamps in optical cable construction. Features: Simple structure, quick and convenient installation. Composition: Single-layer tension clamp is composed of pre-twisted wire, pull ring, U-shaped ring, etc. Single-layer tension clamps can also be made of aluminum-clad steel wire or galvanized steel wire according to the application and user requirements
Suspension clamp Purpose: ADSS pre-twisted wire suspension clamp is mainly used for overhead self-supporting ADSS optical cable lines for hanging optical cables, similar to ordinary suspension clamps. It is recommended to use the environment when the line corner is less than or equal to 30º. Features: 1. The reasonable distribution of extremely low static stress improves the bearing capacity of dynamic stress (such as vibration or dancing), and its grip strength can reach 10% to 20% of the ultimate tensile strength (RTS) of the optical cable. 2. There is no rigid contact with the optical cable (flexible grip) to minimize abrasion. 3. The excellent material makes the clamp have good elasticity and toughness, strong fatigue resistance and corrosion resistance, and long safe service life. 4. Not only effectively protects the optical cable, but also its smooth contour shape greatly reduces corona discharge and electromagnetic loss. Composition: The pre-twisted wire suspension clamp is composed of inner stranded wire, outer stranded wire, rubber inserts, and hanging splint (housing). Users can configure and purchase other connectors according to design requirements.
Use of double suspension clamp:
ADSS pre-twisted wire double suspension clamp is also called double fulcrum suspension clamp. In addition to having all the properties of a general single suspension clamp, it is mainly used for long-distance aerial ADSS optical cable lines and corners over 800 meters across rivers and canyons. °~60° on the pole tower. Features: The optical cable is supported, fixed and protected by double fulcrums, thus ensuring the safe and reliable operation of the optical cable in the long-span, large-angle environment. Composition: Pre-twisted wire double suspension clamp is composed of inner layer wire, outer layer wire, rubber plug-in, hanging splint, hanging board, triangle joint board and so on. Users can configure and purchase other connectors according to design requirements.
Mechanical suspension clamp use:
The short span suspension clamp is a kind of suspension clamp, which is between the tangent clamp and the pre-twisted suspension clamp. It is suitable for linear pole towers with line span between 100 and 200 meters and line corners below 15º. The breaking strength of fittings is ≥40KN. Features: It has the characteristics of convenient tangent clamp. Due to the addition of a pre-twisted wire reinforcement layer, it also enhances the dynamic load resistance of the optical cable to a certain extent. Composition: The mechanical suspension clamp is composed of reinforced pre-twisted wires, rubber inserts, shells, U-shaped rings, etc.
Use of tangent clamp:
The tangent clamp is a kind of linear suspension clamp, which is mainly used to provide a light, simple, and low-cost protective installation clamp for small-span overhead optical cables. It is especially suitable for the needs of urban communication network construction and transformation. It is mainly used for the installation of optical cables on short-span linear pole towers below 100 meters, or pole towers with a rotation angle less than 15º. Breaking strength ≥40KN. Composition: Each set of tangent clamps includes: housing, rubber inserts, bolts, nuts, washers, etc.
Use of pre-twisted wire tangent clamp: The pre-twisted wire tangent clamp is mainly used for linear pole towers on lines with a span of less than 75 meters. Features: The function of the pre-twisted wire tangent clamp is similar to that of the tangent clamp, but its installation is simpler. The installer does not need special tools, and the installation can be carried out smoothly with bare hands, and it is easy to ensure the quality of the installation, and the weight is also light. Composition: The pre-twisted wire tangent clamp is composed of pre-twisted wire clamp legs, loops, and right-angle hanging boards.
The use of anti-corona ring: The anti-corona ring is mainly used on ADSS optical cables that are above 220KV and are erected on the same tower as the transmission line. Since the optical cable and the pre-twisted wire fittings are located in a higher electric field space, the ends of the pre-twisted wire fittings are susceptible to corona discharge. Threat to the safe operation of optical cables. The anti-corona ring can greatly improve the state of the electric field at the end of the pre-twisted wire, reduce the electrical corrosion of the optical cable caused by the corona, and extend the service life of the optical cable.
