1. The outer layer of power cable is generally rubber or rubber synthetic sheath, which is used for insulation and protection of cable from damage.
1. The outer layer of power cable is generally rubber or rubber synthetic sheath, which is used for insulation and protection of cable from damage.
2. Power cables are divided into high-voltage or low-voltage cables. If it is high-voltage, there will also be a layer of resin like filler inside, which plays an insulating role. In high-voltage cables, this layer is an important part of insulation. The low-voltage cable does not have this layer of things, and then it will be wrapped with something similar to a ribbon. This is to fix each core of the cable and fill the gap in the middle.
3. The shielding layer can be divided into two cases. The shielding layer of power cable has two functions: first, because the current passed by the power cable is relatively large, magnetic field will be generated around the current. In order not to affect other components, the shielding layer can shield the electromagnetic field in the cable; Second, it can play a certain role in grounding protection. If the cable core is damaged, the leaked current can flow along the shielding layer, such as the grounding grid, to play a role in safety protection.
4. In many places, especially the control cable of the computer system, the shielding layer here is used to shield external influences, because its own current is very weak and it is very afraid of the influence of external electromagnetic fields.
5. The power cable shall be composed of conductive core, insulating layer and protective layer. Detailed classification (high voltage and low voltage are not included): conductive wire core, inner semiconducting layer, insulating layer, outer semiconducting layer, copper shield, filler, inner liner, double steel strip protective layer and outer protective layer.