Aerial cables general models and types

Aerial cables include the following types and models:
1, the use of steel core aluminum stranded conductor XLPE insulated overhead insulated cable (model JKLGYJ-1, 1X10/2), pole span can be 20 meters, JKLGYJ-11X10/2 term allows ampacity is 75A, considering the distance of line loss, but is enough. Pay attention to the local power supply voltage is high, if is low, consider the use of the JKLGYJ-1, 1X16/3 (refer to the ampacity is 100A), the main consideration of the aluminum core wire line loss is bigger.
2, do not use wire to wear tube, the tube is not conducive to heat. The aluminum core VLV and 3X10+1X6 or VLV, 0.6/1kv, 3X16+1X10 type polyvinyl chloride (PVC) insulated and sheathed power cable, the vertical pole pull rope, cable hook or insulating binding wire in wire rope can be. VLV, 3X10+1X6 reference carrier flow is VLV, 40A, 0.6/1kV, 3X16+1X10 reference load flow is 54A. Two kinds of aluminum core cable prices are not too expensive, basically almost.
Aerial cable refers to the contact network in the electrified railway, along the rail shape erection, for the pantograph to take the flow of high voltage transmission line. The contact network is the main frame of the railway electrification project, and it is special form of transmission line which is set up over the railway line. The device is composed of contact suspension, supporting device, positioning device, supporting device and base.

What is Overhead power lines?

Overhead power lines generally are devided into low voltage and high voltage, low voltage overhead line is generally four wires, showed glyph arrangement, high pressure is three roots, is tasted glyph arrangement, tower must be high tension line, is generally two a total of six. Low-voltage wire generally used to flex, seldom used now, replaced by cable, high-voltage lines are bare, the core is steel wire, the appearance is aluminum wire, commonly known as steel core aluminum stranded wire. The overhead cable is also called the cable, not the overhead line.
The overhead line set up in the air by wire tower and cement tower, usually bare wire. Overhead line is low cost, but it occupies a large channel area, and is the main line type. Overhead lines by wire, shielding wire, towers, insulators and fittings such as forming the wire: power transmission can lightning line: the lightning current into the earth to protect power lines from lightning Tower: support insulator of conductor and ground wire: the conductors and tower keep insulating fittings: support, splice, to protect the wire and grounding wire, connection and protect the insulator.Overhead power lines

In general high-voltage lines use overhead cable, high-voltage lines because of very high above the ground, in order to reduce the cost. Therefore, the use of bare conductor, if it is in underground or near buildings, must choose the insulated cable. The electric voltage through the high voltage line is high in the current large, easy to heat insulation, can burn the skin, even skin breakdown.
Under high pressure, some of the materials, such as rubber, plastic, dry wood, and so on will also become a conductor, it can not afford the insulation effect. If you are still in the high voltage line package insulation, it is to spend more money, wasted money and material.
The surface of the high voltage wire is not covered with insulation, it is hung on the high tower, it may be due to contact with the tower and leakage. In order to prevent this phenomenon, high voltage wires are always hanging below long string good insulation insulator, making high tension line and tower insulation.


Installation of overhead insulated cables

1. Hanging overhead cable line hanging installation include: hanging with the selection, installation suspension splint, cloth hanging, hanging connection, end, tighten the suspension and.
Erecting hanging all plastic cable line pre hanging hook method, the pulley edge on the edge of the hanging method, fixed pulley traction method and the car pulls the movable pulley holder hanging method.
2. Self bearing type overhead cable line and does not require the installation of a further suspension wire and cable hook hanging, but must use self bearing type special iron pieces, as long as the installation device for curved groove splint can be laying cable and then tighten self bearing steel wire, terminal.
Aerial cable is the cable rack hanging in from the ground has a certain height pole of a cable construction with underground cables compared, although is more susceptible to outside influence and not safe enough, nor beautiful, but set up simple, construction cost low, so in the far away from the office, less number of users change greatly, laying underground cables have difficult place is still widely used.
High voltage overhead cable generally use 300 the following all plastic cable, because of the cable itself has a certain weight, poor mechanical strength, so in addition to self supporting cable must set up another messenger wire, and use hook to supporting cable below messenger wire.