ADSS optical cable(ADSS cable), is a kind of composition, all from the media material itself contains the necessary non metal cable support system, can be directly hung on the power tower. The main route for communication overhead high-voltage transmission system, but also can be used for communication line lightning prone areas, large span overhead laying environment.
Self bearing type refers to the cable reinforcing member can withstand the weight and external load. This name has pointed out the use of environment and key technology of this kind of cable: because it is self-supporting, so the mechanical strength of all dielectric materials is important; because the cable in high voltage environment, must be able to withstand the strong; because it is used in overhead power transmission tower, so there must be a matching Pendant of the cable fixed on the tower. The ADSS cable has three key technologies: suspension cable mechanical design, the determination and selection and installation of fittings.
ADSS optical fiber and cable Mechanical properties
The mechanical properties of the cable is mainly reflected in the cable tension, maximum running average running tension and tensile strength etc.. Ordinary cable national standard is very clear in different way (such as overhead, buried pipeline, etc.) the mechanical strength of the cable should have. The ADSS cable is a self-supporting aerial cable, long-term effect so it must bear their own gravity, but also must be able to withstand the natural environment such as strong winds, snow and rain baptism, sun frost. If the mechanical properties of ADSS cable design is not reasonable, and the local weather does not adapt, then there will be security risks, cable life will be discounted. So for the ADSS cable project each cable route must be based on the natural environment and the span of strict design using professional software, to ensure that the cable has enough mechanical strength.
ADSS Optical fiber Cable suspension points
Because ADSS is the high voltage power line and cable way dance, so the surface in addition to the requirements and common cable as anti ultraviolet radiation, also can withstand high voltage and long term environmental test. The capacitive coupling between the cable and the high voltage line and the earth will have different potential in fiber surface. In the snow and frost and other weather conditions and dust under the action of potential difference caused by partial leakage current in the cable surface moisture contamination, thermal effect of the cable surface part of water is evaporated, dry in the moment, the leakage current interruption to produce arc and large accumulation of heat, heat will burn the surface of cable, forming a branch like the traces, which is called electric mark. After a considerable period of time the outer sheath aging damage, from the outside to the inside, the mechanical properties of aramid yarn aging decreased, eventually there will be cable fault. At present, mainly from two aspects to solve the problem. One is the use of special resistance sheath material to the extrusion of aramid yarn and the outer protective layer, which uses AT resistance sheath to reduce power electric mark corrosion on the fiber surface; in addition to the space potential distribution on the power tower to calculate and draw the field intensity distribution by professional software, according to this the scientific basis to determine the specific cable on the tower suspension points to avoid cable by stronger electric field.
ADSS fiber optic cable mounting hardware
ADSS cable on the tower is fixed by the hardware to complete the installation. Install fittings must be matched with different cable, cable tower, different span, different diameter for fittings are not the same. So, what kind of problems with fittings for each tower design, in which the tower connecting each disk cable disc long should be designed in Goods are available in all varieties. If the hardware is improper, serious problems may be loose or broken fiber cable etc..
