Overhead cables include the following types and models:
1, the use of steel core aluminum stranded conductor Xlpe insulated aerial insulation cable (model JKLGYJ-1, 1X10/2), standing rod distance can be 20 meters, JKLGYJ-11X10/2 long-term allowable flow of 75A, Overhead Cable consider distance far line loss, but enough. Note 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), mainly considering the line loss of aluminum core line larger.
2, do not use wire, wear tube is not conducive to cooling. Directly using VLV, 3x10+1x6 or VLV, 0.6/1kv, 3x16+1x10-type aluminum conductor PVC insulated and sheathed power cable, wire rope, cable hooks or wire rope with insulated wire can be tied. VLV, 3x10+1x6 reference load flow is 40A, VLV, 0.6/1kv, Overhead Cable 3x16+1x10 reference load is 54A. The price of the two aluminum core cables is not too expensive, basically similar.
Overhead cable refers to the high voltage transmission line which is erected by the zigzag line of the rail in electrified railway, which is provided by the pantograph. Catenary is the main frame of railway electrification project, Overhead Cable and is a special form of transmission line which is set up along the railway lines to electric locomotive. It is composed of contact suspension, support device, positioning device, Overhead Cable Pillar and foundation parts.
Aerial cable has aluminum heart and copper heart two kinds. In the distribution network, the application of aluminum heart is more, because the aluminum is relatively light, and the cost is relatively cheap, the line connection and support parts of the low requirements, coupled with the original distribution line to the steel core aluminum wire, Overhead Cable the selection of aluminum heart line to facilitate the connection with the original network. In the actual use also selects the aluminum heart line more. The copper heart line is mainly used as the lead of the transformer and switch equipment.
Insulating material: The insulating protective layer of the aerial cable has thick insulation (3.4mm) and thin insulation (2.5mm) two kinds. The operation of thick insulation allows frequent contact with trees, Overhead Cable and thin insulation is allowed only in short contact with trees. The insulating protective layer is divided into cross-linked polyethylene and light polyethylene, and the XLPE insulation performance is better.
Main features of aerial cable
Good insulation performance. Overhead cable due to a layer of insulating layer, insulation performance than bare wire superior, can reduce the line between the distance, Overhead Cable reduce the insulation requirements for the line support parts, improve the number of circuit line.
Good anti-corrosion performance. Aerial cable due to the outer layer of insulation, less than the bare wire by the degree of oxidation corrosion, strong corrosion resistance, Overhead Cable can extend the service life of the line.
Anti-external damage, reduce the impact of trees, flying, metal film and dust and other external factors, reduce the phase of short circuit and grounding accidents.
Strength to meet the requirements. Although the insulated conductor has less steel heart, but tenacity, the mechanical strength of the entire wire achieves the stress design requirements.