Knowledge of wire and cable Ningbo Qiaopu Electric Co., Ltd.

Qiaopu some basic knowledge of wire and cable: 
1, the common power lines, cables can be divided according to use bare wire, insulated wire, heat-resistant wires, shielded wires, power cables, control cables, communication cables, RF cables. 
2, Qiaopu power cord insulation used as follows: PVC insulated wires, PVC insulated flexible wire, PVC nitrile mixture of insulated cords, rubber insulated wire, buried underground agricultural plastic insulated aluminum wire, rubber cotton textile cord insulation, PVC insulated and Nylon jacketed wires, PVC insulated power and lighting soft lines. 
3, Qiaopu cable tray suitable for general industrial and mining enterprises laying indoor and outdoor overhead power cables, control cables, can be used for telecommunications, radio and television sector in the indoor and outdoor set up. 
4, cable accessories have cable terminal box, cable junction box in the indirect, connection tubes and blocks, steel cable trough, cable tray and so on. 
5, cable middle connector and the cable connecting the cable conductor, insulation shield and the protective layer, so that the cable line connected device, called the Cable Joints. 
6, the electrical wiring is the main power plant and substation electrical equipment and major bus connections, including the main bus and auxiliary power system functional requirements according to a certain connection. 
7, the choice of the section of power cable, the Qiaopu accordance with the following principles: 
(1) rated voltage cable installation point is greater than or equal to the rated voltage of power supply system; 
(2) Cable continued to allow the current should be equal to or greater than the maximum continuous load current of power supply; 
(3) section of wire core power supply system to meet the requirements of the stability of short circuit; 
(4) According to the cable length checking whether the voltage drop requirements; 
(5) lines at the end of the minimum short-circuit current protection device should enable reliable action. 
8, cross-linked polyethylene cable and compare advantages of oil-paper cable: 
(1) easy to install, because it allows the minimum bend radius is small, and light weight; 
(2) independent of line drop restrictions; 
(3) good thermal performance, allowing higher operating temperature, transmission capacity; 
(4) cable accessories simple, are the dry structure; 
(5) operation and maintenance is simple, no oil leakage problems; 
(6) lower price; 
(7) high reliability, low failure rate; 
(8) manufacturing process a small, simple process, significant economic benefits. 
9, the fixed exchange single cable fixture should constitute a closed circuit without iron, because when the cable core through the current, generated in the surrounding magnetic field lines, magnetic field lines and the current through the wire core is proportional to, the use of iron and other magnetic materials, based on electromagnetic induction we know that iron will be produced in the vortex of the cable heating, and even burn cables. So we can not use the iron for the single AC cable fixture. 

Qiaopu, Qiaopu appliances, Ningbo Qiaopu, Plug, Ningbo Qiaopu Electric Co., Ltd.