Shielding wire is a transmission line that uses a metal mesh braid layer to wrap the signal line, and the braid layer is generally red copper or tinned copper. The shielding layer of the shielding line needs to be grounded, and the external interference signal can be imported into the earth by this layer.

Function: To avoid interference signals into the inner layer, conductor interference while reducing the loss of the transmitted signal.

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

The shielding layer of the shielding cable is mainly made of non-magnetic materials such as copper and aluminum, and the thickness is very thin, far less than the skin depth of the metal material on the frequency of use, the effect of the shielding layer is mainly not due to the reflection and absorption of the electric field and magnetic field of the metal body itself, but due to the grounding of the shielding layer, the form of grounding will directly affect the shielding effect. The grounding methods of the shielding layer for electric field and magnetic field are different. It can be ungrounded, single-ended grounded or double-ended grounded.

structure

The wrapped conductor is called the shield layer, which is generally conductive cloth, braided copper mesh or copper (aluminum) platinum.

Common: insulation layer + shielding layer + wire.

Advanced: insulation layer + shielding layer + signal wire + shielding layer ground wire.

Apply

The shielding layer needs to be grounded, and the external interference signal can be imported into the ground by the layer to avoid interference from the interference signal into the inner conductor and reduce the loss of the transmitted signal. The function of the shielding line is to isolate the electromagnetic field noise source from the sensitive equipment and cut off the propagation path of the noise source. The 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, and it is the shielding of the sensitive equipment.

Precautions for use

The shielding layer of the shielding line does not allow multi-point grounding, because different ground points are always different, and there is a potential difference at each point. Such as multi-point grounding, the formation of current in the shield layer, the induction of current on the wire, the induction of interference on the signal line, not only does not play a shielding role, but the introduction of interference, especially in the frequency converter used in many occasions, the interference contains a variety of high-order harmonic components, resulting in greater impact, should pay special attention to.

Qingdao Tianxing Cable Co., Ltd. is a technology enterprise specializing in the production of wire and cable in Shandong Province, with more than 150 sets of domestic excellent cable production equipment and testing equipment, excellent production technology, modern testing equipment, to ensure stable product quality and timely supply. The company's main products are power cable, mineral cable, high life wire and cable, radiation crosslinked cable, control cable, computer cable, photovoltaic cable, communication cable, data cable, low smoke halogen free cable, flame retardant series wire and cable.

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