The operating quality, safety and reliability of the power supply system are not only related to the quality of the wire and cable itself, but also related to the construction quality of the cable accessories and lines.

How the cable is laid

There are the following ways of laying cables: directly buried laying, pipe laying, shallow trough laying, cable trench laying, cable tunnel laying, overhead laying several ways have advantages and disadvantages, generally consider urban development planning, the density of existing buildings, the number of cable line length laying and the impact of the surrounding environment. Direct buried laying and shallow channel laying are economical laying methods, direct buried cable is an economical and extensive laying method of electricity, which is used in suburban areas and places where vehicle traffic is not too frequent. However, it is not conducive to the maintenance and repair of the cable, once the cable fault is encountered, even if the fault point is measured by the tester, the cable trench must be dug again, which is very inconvenient. Therefore, the choice of cable laying method should be combined with the actual situation, according to the engineering conditions, environmental characteristics, cable type and quantity and other factors, with the vision of development, in accordance with the requirements of meeting the operation reliability, easy maintenance and the principle of technical and economic rationality.

Cable selection

Commonly used power cables are oil-immersed cables, polyvinyl chloride insulated cables, cross-linked polyethylene cables, etc., and extend to different types of special cables according to the use of different occasions. At present, with the continuous improvement of production technology and production process, crosslinked polyethylene cable has become a widely used cable products, in the cable selection, should be based on the use of different environments and conditions, combined with the specific situation to choose, to minimize the crossing of various pipe side railway, highway and communication cable; If the direct buried and shallow groove laying method is used, the cable with steel armor should be considered.

Cable cross-sectional area selection

The choice of cable cross-sectional area is related to the amount of investment, the loss and voltage quality of the line, and the service life of the cable. If the cross-sectional area is too small, it will lead to a decrease in voltage quality and excessive line loss, which will make the initial investment too high. Therefore, the development planning should be based on the load prediction results, and the appropriate cross-sectional area should be selected, so that the power cable can meet the requirements of cable core temperature and voltage drop under the working current, and thermal stability under the action of short circuit current. Due to the high difficulty and low accuracy of load forecasting, the selection of cable cross-sectional area should also meet the requirements of "Technical Guidelines for Urban Medium and Low Voltage Distribution Network Transformation" and "Urban Power Network Planning Guidelines". In the three-phase four-wire low-voltage power grid selection of power cables, but also consider the choice of neutral line cross-sectional area, in the public low-voltage network, due to the greater impact of user factors, three-phase load balance is difficult to control, in order to maintain voltage quality, reduce line loss, neutral line cross-sectional area should be the same as the phase line cross-sectional area.

Qingdao Tianxing Cable Co., Ltd. focus on supporting wire and cable production customization manufacturers, annual production capacity of 1 billion yuan. 6000 square meters of storage, standing inventory, order demand for rapid delivery, large prices more favorable. Hotline: 16678668098