Direct supply tether cables [applications: balloons, aerostats, drones] resistant to high and low temperatures, tensile, wear-resistant, and impact-resistant.
Tether cables are applied in aerostats such as balloons, aerostats, or drones.The following is the presentation of the types and usage of tether cables: According to the function and structure, the tether cables includes four types: Pure cable, Tether Cable, Tether Optical Cable and Tether Hybrid Optical-Electrical Cable. Pure Cable is composed with tensile elements and sheaths, without optical nor electrical units; tether cable only contains electrical conductors and the electrical conductors within the cable are used to supply power from ground facilities to the equipment on the aerostat. The tether cable only contains optical fiber without electrical conductors and the equipment on the aerostat supplies electrical power with its own onboard generator set and the optical fiber within the cables is used to transmit optical signal between equipment on the aerostat and equipment on the ground; The tether hybrid optical-electrical cable contains both optical fiber and electrical conductor. The electrical conductors supply power to the equipment on the ballon, while the optical fiber is responsible for transmitting optical signals between the sphere equipment and the ground equipment.
Different types of cable above mentioned will be called as tether cable in the following. Practically distinct from traditional optical fiber or electrical cables, when regarding the design for the tether cable it?s necessary to take profund comprehension of the working features and applying environment of the tether cables. The design for the tether cable must satisfy to its specific requirement of usage and particular demands from clients.
Advantage of the product
Normally the using process of the tether cables has the following features which should be taken into consideration when designed.
1.A conventional optical or electrical cable is typically laid only once, whereas a tether cable needs to be repeatedly deployed and retracted during usage, often subject to repeated coiling under stress.
2.During the ascent and hovering of the aerostat, the tether cable is constantly under tension and subjected to repeated stretching due to the influence of wind direction and wind force.
3.The lifting load of the aerostat is strictly limited, and similarly, the weight and outer diameter of the tether cable are also subject to strict limitations.
4.For the aerostat system function, some tether cables must include a lightning discharge pathway to enhance the cable?s safety during lightning strikes. Therefore, certain tether cables must also contain an electromagnetic radiation shielding layer.
5.For the aerostat system's function, some tether cables must include optical fiber, while others must contain electrical conductors. Some cables must include both optical fiber and electrical conductor simultaneously.
6.The cable is always under stress during operation, including tension, side pressure, impact, torsion, and bending. Therefore, the tether cable must have excellent mechanical properties to ensure that the optical and electrical units inside the cable can function properly when the cable is under load.
7.The cable is used in outdoor environments and must be designed to withstand low air pressure, high temperatures, low temperatures, sunlight, and salt mist corrosion, among other environmental factors.
8.When the cable contains electrical conductors, the electrical conductors typically carry several kilovolts of high-voltage current. The design must fully consider the conductor's voltage resistance, high-current performance, and the temperature rise in the cable caused by the current.
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