How To Choose ADSS?

ADSS fiber optic cable, also known as all medium self-supporting fiber optic cable, adopts a loose sleeve layer twisting structure. The fiber optic cable is wrapped in a loose sleeve made of high modulus polyester material (the fiber optic cable uses A-grade fiber from FiberHome and Long Fly to ensure excellent transmission performance and stable structural performance), and the sleeve is filled with waterproof compound. A loose tube (and filling rope) is twisted around a non-metallic center reinforced core (high-strength FRP) to form a compact cable core, and the gaps inside the cable core are filled with water-resistant grease. The cable core is extruded with a polyethylene (PE) inner sheath, then twisted in both directions with two layers of aramid yarn (DuPont's "Kevlar") for reinforcement, and finally extruded with a polyethylene (PE) jacket or an electrically corrosion-resistant (AT) jacket.

In fact, ADSS optical cables design need to refer to many technical parameters. As they are used in the power system, the following factors should be considered:

1. Span: ADSS fiber optic cable span refers to the distance between each power pole. In a communication project, if the distance between the designed poles of ADSS optical cable is farther, the amount of poles used will be reduced. However, ADSS optical cable needs to be strengthened by its own tension in the air, and the amount of aramid used in ADSS optical cable will be larger, resulting in an increase in the cost of the optical cable. In China, most ADSS fiber optic cable manufacturers choose to use domestically produced aramid yarn for small spans to reduce costs. Our OFU fiber optic cable manufacturer uses imported aramid yarn for spans ranging from 50 meters to 1000 meters. The disadvantage of domestically produced yarn, also known as high-strength yarn, is that it is not heat-resistant and flame retardant. Aramid is characterized by ultra-high strength, high temperature resistance, acid and alkali resistance, light weight, insulation and aging resistance.

2. Wind speed: The stronger the wind in the environment where ADSS optical cables are used, the greater the amount of aramid used in the cable, and the higher the tensile strength required for the cable, resulting in higher costs.

3. Ice formation: If ADSS optical cables are located in extremely cold regions with low winter temperatures, ice formation will occur on the outer skin of the cables after being exposed to rain and snow, increasing the tension of the cables in the air and increasing the amount of aramid used, resulting in higher costs. This factor does not need to be considered for use in non cold regions.

The above three indicators are calculated based on the usage environment to determine the amount of aramid used in ADSS optical cables. As we mentioned earlier, aramid is a high cost reinforcing fiber.

4. Arc resistant: ADSS optical cables are used on high-voltage power poles, and the discharge arc of high-voltage power lines can burn the cable sheath. Therefore, ADSS optical cables generally use arc resistant materials as sheaths, which are AT sheaths.

Usually, the arc voltage is 110KV (kilovolts) and 220KV. The conventional arc resistant material for ADSS fiber optic cables in 220KV environments is not very effective, and OPGW fiber optic cables are generally used instead.