Cable laying method
The laying methods of the cable include direct burial laying, pipe laying, shallow groove laying, cable trench laying, cable tunnel laying, and overhead laying. In terms of skill comparison, cable tunneling methods and cable trenching methods are the best method of laying, as these two methods facilitate cable construction, maintenance and repair. In some developed cities, when planning and building cities, they have thought about sharing tunnels. Practice has proved that the shared tunnel operation is outstanding, which greatly reduces the number of repeated investment and the repeated excavation of the road surface, but the initial investment is endless.
Commonly used power cables include oil-immersed cables, PVC insulated cables, and cross-linked polyethylene cables. They are extended to different types of special cables depending on the application. Now, with the continuous improvement of production skills and production processes, XLPE cables have become the most widely used cable products. When selecting cables, they should be selected according to the different environments and conditions used. When using the direct burial and shallow trough laying methods, consider the use of steel cables.
Selection of cable cross-sectional area
The selection of the cable cross-sectional area is related to the amount of capital contribution, the loss of the line and the voltage quality, and the service life of the cable. Therefore, based on the results of the load guessing, use the developed vision to select the appropriate cross-sectional area, so that the power cable is satisfied with the core temperature request and voltage drop request under the maximum operating current, and the thermal stability request under the maximum short-circuit current. Because the load guessing operation is difficult and the accuracy is low, when selecting the cable cross-sectional area, it is also satisfied with the request of the “Urban Medium and Low Voltage Distribution Network Transformation Skills Guide” and the “Urban Power Network Planning Guidelines”.
For cable network and cable network automation
Following the continuous implementation and application of power cables in the distribution network, the distribution network can be divided into cable networks and overhead networks (including overhead and cable hybrid networks). "The implementation status and compensation for the "Urban Medium and Low Voltage Distribution Network Transformation Skills Guide" also made specific requests for cable distribution network automation. Therefore, when selecting the cable network in the regional network of the distribution network, new skills and new equipment should be selected according to the request of distribution automation. If there are conditions, it is necessary to think about the automation pilot operation. When the conditions are not mature, the supporting equipment should be selected. Thinking is well taken to lay the groundwork for completing the automation plan.