What is the shielded cable of the cable?

　　The shielded wire of the cable is a specially designed tranSMission wire, which is characterized by the use of a metal mesh braid (usually made of red copper or tinned copper) to wrap the signal wire. The following is a detailed explanation of the shielded wire:

　　First, the definition of shielded wire

　　A shielded wire is a wire that wraps the outside of a conductor with another conductor. The outer wrapped conductor is called a shielding layer. The shielding layer is usually made of materials such as braided copper mesh, copper foil (aluminum) or conductive cloth, and needs to be grounded in order to introduce external interference signals into the earth.

　　Second, the function of the shielded wire

　　Reduce the influence of external electromagnetic fields: shielded wires can significantly reduce the impact of external electromagnetic fields on power or communication lines, ensuring stable signal transmission.

　　Prevent line radiation: At the same time, shielded wires can also prevent lines from radiating electromagnetic energy outward, avoiding interference with other equipment.

　　Isolation of noise sources: The shielded wire isolates the electromagnetic field noise source from sensitive equipment, cutting off the propagation path of the noise source, thereby improving the electromagnetic compatibility of the system.

　　III. Classification of shielded wires

　　Aluminum foil shielded wire: Aluminum foil is used as the shielding layer, which has good electromagnetic shielding performance, but the cost is higher.

　　Copper braided shielding wire: copper wire is used to form a shielding layer, which is relatively inexpensive and suitable for mass production. It also has good electromagnetic shielding performance.

　　Silver foil shielded wire: High-grade shielded wire, using sterling silver foil as a shielding layer, has very good electromagnetic shielding performance, but the cost is very high, generally only used in high-end electronic equipment.

　　Fourth, the grounding method of the shielded wire

　　The shielding layer of the shielded wire needs to be grounded, but multi-point grounding is not allowed. Because there may be a potential difference between different grounding points, multi-point grounding may form a current in the shielding layer, which not only fails to play a shielding role, but may introduce more interference. Especially in the application of high-frequency equipment such as frequency converters, the interference contains various high-order harmonic components, and the impact will be greater. Therefore, the shielded wire should be grounded with single end or according to a specific grounding strategy.

　　Application scenarios of shielded wires

　　Shielded wires are widely used in various applications that need to reduce electromagnetic interference and electromagnetic radiation, such as computer network systems, communication systems, audio & video transmission systems, industrial automation control systems, etc. In these systems, shielded wires can effectively ensure the stable transmission of signals and the normal operation of the system.

　　In summary, a shielded wire is a transmission line with excellent electromagnetic shielding performance, which can significantly reduce the impact of external electromagnetic fields on the line and prevent the line from radiating electromagnetic energy outward. When selecting a shielded wire, the appropriate type and specification should be selected according to the actual needs and scenarios.