The Main Features Of Overhead Cables
Overhead lines mainly by the wire, tower, insulators, cross arm, gold, cable and foundation and other components.
Overhead cables include the following types and models:
1, the use of steel core aluminum wire conductor XLPE insulated overhead insulated cable (model JKLGYJ-1,1X10 / 2), the pole distance can be 20 meters, JKLGYJ-11X10 / 2 long-term allowable load of 75A, consider Far away from the line, but enough. Pay attention to see the local power supply voltage is not high, if relatively low, to consider the use of JKLGYJ-1,1X16 / 3 (reference load 100A), Overhead Cable the main consideration of the aluminum wire line loss larger.
2, do not use wire through the tube, pipe is not conducive to heat. Direct use of VLV, 3X10 + 1X6 or VLV, 0.6 / 1kV, 3X16 + 1X10 aluminum core PVC insulated and sheathed power cable, vertical pole pull wire rope, with a cable hook or insulated wire tied to the wire rope can be The VLV, 3X10 + 1X6 reference carrying capacity of 40A, VLV, 0.6 / 1kV, 3X16 + 1X10 reference load of 54A. Overhead Cable The price of the two aluminum core cables is not too expensive, basically the same.
Overhead cable refers to the catenary is in the electrified railway, along the rail "zigzag" shaped erected for pantograph flow of high-voltage transmission lines. The catenary is the main frame of the railway electrification project, which is a special type of transmission line which is powered by electric locomotives along the railway line. Overhead Cable Which consists of contact suspension, support device, positioning device, pillar and the foundation of several parts.
The structure of the overhead cable
Conductor thread: overhead cable with aluminum and copper heart two. In the distribution network, the application of aluminum is more, because the aluminum is relatively light, Overhead Cable and the cost is relatively cheap, the requirements of the line connecting parts and support pieces, coupled with the original distribution line to steel heart aluminum Mainly, choose aluminum core line to facilitate the connection with the original network. In the actual use of multi-use aluminum core line. Copper core line is mainly as a transformer and switch equipment cited off the assembly line.
Insulation material: Insulated protective layer for overhead cables is made of thick insulation (3.4mm) and thin insulation (2.5mm). Thick insulation of the operation to allow frequent contact with the trees, thin insulation only allowed to contact with the trees for a short time. Overhead Cable Insulation protection layer is divided into cross-linked polyethylene and light polyethylene, XLPE insulation performance is more excellent.
The main features of overhead cables
Insulation performance is good. Overhead cable as a result of more than one layer of insulation, insulation performance than the bare wire superior, can reduce the distance between the lines, reducing the insulation requirements of the line support to improve the number of lines with the pole set up the circuit.
Good corrosion resistance. Overhead cable due to the outer layer of insulating layer, than the bare wire by the degree of oxidation and corrosion, corrosion resistance is strong, Overhead Cable can extend the service life of the line.
Anti-external damage, reduce by trees, flying objects, metal film and dust and other external factors, to reduce the phase short circuit and grounding accident.
Strength to meet the requirements. Insulated wire, Overhead Cable although less steel heart, but tough, so that the mechanical strength of the entire wire to meet the stress design requirements.