The distinction between high-voltage shielded cables used in automobiles

The shielding layer of the shielded cable is mainly made of non-magnetic materials such as copper and aluminum, and the thickness is very thin, which is much smaller than the skin depth of the metal material at the frequency of use. The effect of the shielding layer is not mainly due to the reflection of the electric field and magnetic field by the metal body itself. , absorption, but due to the grounding of the shielding layer. Different grounding forms will directly affect the shielding effect. The grounding methods of the electric field and magnetic field shielding layers are different. Can be ungrounded, single-ended or double-ended.
The conductor wrapped by the structure is called the shielding layer, which is generally conductive cloth, braided copper mesh or copper (aluminum) platinum.

Ordinary cable: insulation layer + shield layer + wire.
Advanced Cable: Insulation + Shield + Signal Conductor + Shield Ground Conductor.

Application: The shielding layer needs to be grounded, and the external interference signal can be introduced into the ground by this layer, so as to avoid the interference signal entering the inner conductor and reduce the loss of the transmission signal. The function of the shielded wire is to isolate the electromagnetic field noise source from the sensitive equipment and cut off the propagation path of the noise source. Shielding is divided into active shielding and passive shielding. The purpose of active shielding is to prevent the noise source from radiating outward, which is the shielding of the noise source; the purpose of passive shielding is to prevent the sensitive equipment from being interfered by the noise source, which is the shielding of the sensitive equipment.

Precautions for use: The shielding layer of the shielded wire is not allowed to be grounded at multiple points, because different grounding points are always different, and there is a potential difference at each point. Such as multi-point grounding, current is formed in the shielding layer, current is induced on the wire, and interference is induced on the signal line, which not only fails to shield, but introduces interference. Various high-order harmonic components have a greater impact and should be paid special attention.


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