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ADSS Full Medium Self-supported Optical Cable
- Jun 19, 2018 -

ADSS full medium self-supported optical cable (All Dielectric Self-Supporting Optical Fiber Cable, referred to as ADSS optical cable), ADSS optical cable is widely used in 220kV, 110kV, 35kV voltage grade transmission lines, generally used in the road which has been built. All dielectric, that is, all dielectric material is used for optical cable. Self-supporting means that the cable should to withstand self-weight and external loads by itself. This name points out the use environment and key technology of the optical cable: because it is self-bearing, its mechanical strength is very important; the use of all dielectric material is because the cable is in high pressure and strong power environment, it must be able to withstand the influence of strong power; the cable and attached fittings should fixe on the tower.

 As the ADSS optical cable is erected with the high voltage power line, the surface of the cable is not only required to resist ultraviolet radiation like the ordinary optical cable, but also is required to withstand the test of the high voltage and strong power environment for a long time. The capacitance coupling between optical cable and high voltage phase line and the earth will produce different spatial potentials on the surface of the optical cable. Under the action of weather environment and dust such as snow and fog, the potential difference causes leakage current locally on the surface of the wet fiber optic cable. The heat effect causes the moisture of the surface of the fiber optic cable surface to evaporate, and the leakage current interrupts the arc and the larger heat energy at the moment of steaming, and the accumulated heat energy will burn the surface of the optical cable to form the image. A branch - like trace, this is the electric mark. After a long period of time, the outer sheath is damaged by aging, and the mechanical properties of aramid yarn are reduced from outside to inside. Eventually, the cable will break. We usually solve this problem from two aspects. One is using special resistance mark sheath to squeeze out the outer protective layer outside the aramid yarn, another is to use the AT resistance mark sheath to reduce the electrical trace corrosion on the surface of the optical cable, and to calculate the spatial potential distribution on the power tower by professional software and draw the distribution map of the electric field intensity. The specific suspension points on the tower can avoid the stronger electric field of the cable. ADSS cables use different sheaths on different power lines. The most common ADSS sheaths are two kinds, PE sheath and AT sheath. PE sheath is ordinary polyethylene sheath for 350KV and below power lines. AT sheath is anti-electric sheath for 110KV and above power lines.