Difference of vehicle power shielded cable

China [CN]

Difference between single-layer power shielded wire and double-layer power shielded wire

The so-called "shielding" of cable structure is actually a measure to improve the distribution of electric field. The conductor wrapped with conductor outside the conductor is called shield wire. The conductor wrapped with conductor outside the conductor is called shielding wire, and the wrapped conductor is called shielding layer, which is generally braided copper mesh or copper foil (aluminum). The shielding layer needs to be grounded, and external interference signals can be introduced into the earth through this layer.

Shielded cable is a transmission line that uses a metal mesh braided layer to wrap the signal line. The braided layer is generally red copper or tinned copper. The shielding layer of the shielded wire needs to be grounded, and the external interference signal can be introduced into the ground by this layer.

Shielded wire is a kind of wire with metal braid shell specially used to reduce the impact of external electromagnetic field on power supply or communication lines. This shielded wire also has the function of preventing the line from radiating electromagnetic energy.

Function: to prevent interference signals from entering the inner layer, and reduce the loss of transmission signals at the same time due to conductor interference.

Note: When selecting the shielded wire, the insulating layer of the grounding conductor of the shielding layer has the conductive function and can be conductive to the shielding layer (with a certain resistance).

The shielding layer of shielded cable is mainly made of copper, aluminum and other non-magnetic materials, and the thickness is very thin, which is far less than the skin depth of metal materials in the frequency of use. The effect of the shielding layer is not due to the reflection and absorption of the metal body to the electric field and magnetic field, but due to the grounding of the shielding layer. Different grounding forms will directly affect the shielding effect. The grounding methods of electric field and magnetic field shielding layers are different. Ungrounded, single ended or double ended grounding can be used. The conductor wrapped in the structure is called shielding layer, which is generally conductive cloth, braided copper mesh or copper (aluminum) platinum.

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