How to identify the advantages and disadvantages of ADSS fiber optic cables How to conduct inspectio

1 Check the manufacturer's qualifications and corporate background.

It mainly depends on whether it is a big manufacturer or a big brand, and whether it is committed to optical cables.

Product development and production, whether there are many successful cases, whether it has ISO 9001 quality system certification, ISO 4oo1 international environmental system certification, whether it complies with RoHS directives, and whether there are certifications from relevant domestic and international institutions. Such as the Ministry of Information Industry, Tell, UL and other certifications.

2 Check the product packaging.

The standard length of the optical cable supply is generally 1 k m k m km, 4 km and customized length specifications, which allows positive and negative deviations, and the deviation range can refer to the manufacturer's factory standard. Check whether the outer sheath of the optical cable has obvious signs such as the number of meters, the name of the manufacturer, and the type of optical cable. Generally speaking, the factory fiber optic cable is wound on a sturdy wooden disc and protected with a wooden sealing plate, the two ends of the fiber optic cable are sealed, and the following signs are on the fiber optic cable reel:

Product name, specification, tray number, length, net gross weight, date, A B end logo, etc.; Check the optical cable test record, there are normally two copies, one is on the inside of the wooden disc with the cable reel, visible when the wooden disc optical cable is opened, and the other is fixed on the outside of the wooden disc.

3 Look at the cable sheath.

The outer sheath of indoor optical cable is generally made of polygreen ethylene or flame retardant poly.

Green vinyl, or LSZH-free materials. The high-quality appearance is smooth and shiny, and it feels good in the hand. It has good flexibility and is easy to peel.

The finish of the outer skin of the poor quality optical cable is not good, and when peeling off, the outer skin is easy to adhere to the tight sleeve and aramid inside, and it should be noted that some products use sponge instead of aramid material. The PE sheath of the outdoor optical cable should be made of high-quality black polyethylene, and the outer skin should be smooth, bright, uniform in thickness and without small bubbles. The skin of the poor quality optical cable has a poor feel, the outer skin is not smooth, and some printing is easy to be erased.

Figure 1-4 looks at the steel wire for reinforcing use.

Many structures of outdoor optical cables generally contain reinforcement.

Steel wire. According to the technical requirements and production requirements, the steel wire in the outdoor optical cable is to be phosphated, the surface is gray, and the hydrogen loss does not increase after the cable is formed, and the strength is high. However, some optical cables are replaced by iron wire or even aluminum wire, and the metal appearance is white and the bending performance is poor.

5 Look at the longitudinal bandaging steel armor belt.

Regular manufacturers generally use double-sided anti-rust coatings.

The longitudinal bandaging steel belt, and the ring wrap joint is good, relatively strong and rigorous. However, we also found that some optical cables on the market use ordinary iron sheets as armor belts, usually only one side is treated with anti-rust treatment, and the thickness of the longitudinal bandaging steel belt is obviously inconsistent.

Look at the arc of his fiber system.

All-dielectric self-supporting optical cable (ADSS) has metal-free, tensile resistance, self-supporting, high insulation, non-inductive, thin diameter, lightweight, easy construction and economy. It is a kind of combined optical cable made by winding the optical fiber bundle around the central reinforcement and insulating, waterproofing, reinforcing and sheathing protection measures.

Features: all-dielectric, metal-free, non-conductive; The cable diameter is small, and the tensile force ratio is large; The linear expansion coefficient is low, and the applicable temperature is wide.

The all-dielectric self-supporting ADSS (All Dielectric Self Supporting) optical cable provides a fast and economical transmission channel for the power communication system due to its unique structure, good insulation and high temperature resistance, and high tensile strength. In general, ADSS cables are less expensive than optical fiber composite ground wh (OPGW) in many applications, and they are easier to install. It is advisable to erect ADSS fiber optic cables using power lines or nearby towers, and even in some places it is necessary to use ADSS fiber optic cables.

The main uses of ADSS fiber optic cables are:

1) It is used as an incoming and outgoing optical cable for the relay station in the OPGW system, and based on its safety attributes, it can well solve the problem of power isolation when introducing and exiting the relay station.

2) Use it as a transmission cable for optical fiber communication systems in high-voltage (110kv-220kv) power networks. In particular, many places have made easy use of it when renovating old communication lines.

3) Use it for optical fiber communication systems in 6kv 35kv 180kv distribution network.

ADSS optical cable (all dielectric self-supporting optical fiber cable, also known as all-dielectric self-supporting optical cable), is a kind of non-metallic optical cable composed entirely of dielectric materials, contains the necessary support system itself, can be directly suspended on the power tower, mainly used for the communication line of the overhead high-voltage transmission system, and can also be used for the communication line in the overhead laying environment such as lightning-prone areas and large spans.

Optoelectronic Optoelectronics Technology ADSS Optical Cable Product Features:

The cable diameter is small, the weight is light, the span can be 1500m, and the additional load on the tower is low;

High tensile strength, can exceed 90kN;

Non-metallic structure, good insulation performance, lightning protection;

The production process is excellent, the aramid yarn is evenly stressed, and it has excellent stress and strain performance;

Excellent anti-performance

The best anti-galvanic corrosion performance;

It can be constructed without power outage, and the failure of power lines does not affect the normal transmission of optical cables;

Single-mode, multi-mode optical fiber and integrated optical cable design;

The sleek shape makes the optical cable have superior aerodynamic performance;

The all-medium optical cable structure is conducive to installation and maintenance;

The temperature adaptation range is wide and the linear expansion coefficient is small, which meets the requirements of harsh environments.

Hope it helps.

Non-metallic self-supporting optical cables, special power optical cables, generally suitable for lines below 35kV.

Rated tensile strength.

Also known as ultimate tensile strength or breaking force, it refers to the calculated value of the sum of the strengths of the load-bearing cross-section (mainly counting spinning). The actual breaking force should be calculated at 95% (the fracture of any element in the optical cable is judged to be the cable breakage). This parameter is not optional, and many control values are related to it (e.g. tower strength, tensile fittings, anti-vibration measures, etc.).

For the fiber optic cable profession, if the ratio of RTS MAT (equivalent to the safety factor K of overhead lines) is not appropriate, even if a lot of spinning is used, and the available fiber strain domain is very narrow, the economic-technical performance ratio is very poor. In general, MAT is equivalent to about 40% RTS.

EDS annual average stress.

Sometimes called the average daily stress, it refers to the tension of the cable under load when the load is theoretically calculated under the absence of wind and ice and the annual average temperature, which can be regarded as the average tension (strain) force of ADSS in long-term operation. EDS is generally (16-25)% RTS. Under this tension, the fiber should be strain-free and free of additional Huiji cover attenuation, that is, it should be very stable.

EDS is also the fatigue aging parameter of the optical cable, according to which the anti-vibration design of the optical cable is determined.

UES Limit Operating Tension.

Also known as special use tension, it refers to the maximum tension of the cable when it may exceed the pre-set alarm load during the effective life of the optical cable. It means that the fiber optic cable is allowed to be overloaded for a short time, and the fiber can withstand strain within a limited allowable range, usually UES should be >> 60% RTS. Under this tension, the fiber is strained "central tube" and "layer strand", and the fiber will have additional attenuation, but after this tension is removed, the fiber should return to normal.

This parameter guarantees the reliable operation of ADSS fiber optic cables during their lifetime.

The elastic modulus of aramid rope is more than half smaller than that of steel, and the thermal expansion coefficient is a fraction of that of steel, which determines that the ACSS cable sag is sensitive to external load changes. The elongation of ADSS cable can be reached in the icing state, while the wire is only; The sag is relatively sluggish to temperature change, and the sag basically remains unchanged when the temperature changes. Under the condition of strong wind, the wind declination angle is very large, and when the wind speed is 30m s, the wind declination angle can reach 80°, and the wind declination angle of the conductor is only about half of that of the optical cable.

It has a strong ability to withstand extreme weather conditions (high winds, icing, etc.).

The outer sheath of ADSS optical cable is AT or PE material, which operates in a strong electric field and has the problem of electric erosion.

ADSS cables are subject to wind vibrations. A smooth and stable transverse wind blows towards the fiber optic cable, which will cause wind vibration and fatigue damage at the anchor point.

ADSS fiber optic cable has a certain degree of remorse and quiet pressure resistance, and can withstand the large grip force of the tension clamp.

Because ADSS optical cable is dancing with high-voltage power lines, its surface is not only required to be as blue as ordinary optical cables, but also required to be able to withstand the test of high-voltage and high-voltage environment for a long time. The capacitive coupling between the cable and the high-voltage phase wire and its connection to ground creates different space potentials on the surface of the cable. Under the action of rain, snow, frost and other meteorological environments and dust and scale, the potential difference causes leakage and empty flow on the surface of the wet and dirty optical cable, and the thermal effect caused the water in some areas of the surface of the optical cable to be evaporated, and at the moment of evaporation, the leakage current is interrupted to produce arc and large heat energy, and the accumulated heat energy will burn the surface of the optical cable, forming a dendritic trace, which is the so-called electric trace.

Over time, the outer sheath is aging and damaged, and the mechanical properties of aramid yarn aging are reduced from the surface to the inside, and eventually the optical cable will break. There are two main ways to solve this problem. First, a special tracking resistant sheath material is used to extrude the outer sheath of the aramid yarn, that is, the AT tracking resistant sheath is used to reduce the tracking corrosion on the surface of the optical cable by strong electricity; In addition, the spatial potential distribution on the power tower is calculated by professional software and the electric field intensity distribution map is drawn, and the specific suspension point of the optical cable on the tower is determined according to this scientific basis, so as to avoid the stronger electric field action of the optical cable.

ADSS optical cable is a kind of all-medium self-supporting optical cable, characterized by the use of loose sleeve structure, the cable core is stranded, the external protective sleeve has the function of anti-electric corrosion, the stranding method of ADSS optical cable is SZ stranding, the advantages of ADSS optical cable are light weight, no auxiliary hanging wire, low construction cost.

Precautions for the use of household appliances:

1. Do not reconnect the wires without permission to avoid accidents.

2. Do not use a power supply other than AC 220V to avoid damaging the equipment.

3. Household appliances have different working modes, which can be operated through the control panel.

4. Refrigerators, air conditioners and other equipment are divided into different types and different installation methods, which can be selected according to the needs of use.

5. The shell of household appliances is generally plastic, do not wipe it directly with alcohol and other liquids, it may damage the shell of the equipment, and you can wipe it with a clean soft cloth.

6. Household appliances have different powers, and it is recommended to pay attention to these parameters when purchasing.

Data expansion: ADSS optical cable is a combination of optical fiber cable made of optical fiber bundle on the center reinforcement after insulation, waterproofing, reinforcement, sheath and other protective measures, ADSS optical cable is cheaper than optical fiber composite ground cable OPGW (optical fiber composite ground wh) in many applications, and it is easier to install.

It is mainly used for communication lines of overhead high-voltage transmission systems, and can also be used for communication lines in overhead laying environments such as lightning-prone areas and large spans.

Introduction: ADSS optical cable is also known as all-medium self-supporting optical cable, the all-medium is the all-dielectric material used in the optical cable, and the self-supporting type refers to the reinforcing components of the optical cable itself that can withstand its own weight and external load. This name points out the environment in which this fiber optic cable is used and its key technologies:

Because it is self-supporting, its mechanical strength is very important; The use of all-dielectric materials is because the optical cable is in a high-voltage and high-current environment, and must be able to withstand the effects of strong electricity. Since it is used overhead on the power tower, there must be a matching pendant to fix the optical cable on the tower. That is, ADSS optical cable has three key technologies: the mechanical design of the optical cable, the determination of the suspension point and the selection and installation of supporting fittings.

ADSS Optical Cable Mechanical PropertiesThe mechanical properties of optical cables are mainly reflected in the maximum allowable tension, annual average operating tension and ultimate tensile strength of the optical cable.

The national standard for ordinary optical cables clearly stipulates the mechanical strength of optical cables with different use methods (such as overhead, pipeline, direct burial, etc.). The ADSS optical cable is a self-supporting overhead optical cable, so in addition to the long-term effect of its own gravity, it must also be able to withstand the baptism of the natural environment. If the mechanical performance design of ADSS fiber optic cable is unreasonable and incompatible with the local weather, there will be potential safety hazards in the fiber optic cable, and the service life will be reduced.

Therefore, each ADSS optical cable project must be based on the natural environment where the optical cable route is located and the span ADS's erection pitch can reach 1800 meters, high voltage resistance, good anti-erosion performance, lightning protection, can be laid on the transmission line tower of 500kV voltage level, and has a strong anti-bullet performance, the general sand gun shooting at a distance of 10 meters will not cause fault damage to the optical cable. It also has strong low temperature resistance and environmental adaptability. Optical cables are laid independently without relying on transmission lines, which is convenient for construction and maintenance, and does not require power outages, and optical cables are relatively cheap.