What is a shielded cable and what is the role of a shielded cable

It is the kind of cable that has a layer of mesh between the skin and the cable core, and when used, this layer of mesh should be grounded, which can effectively prevent interference. This is the shielded cable.

A shielded cable is a transmission line that wraps the signal wire with a metal mesh braid. The braid is generally red copper or tinned copper. The shielding is to ensure the transmission performance of the system in the environment of electromagnetic interference, and the anti-interference here should include two aspects, that is, the ability to resist external electromagnetic interference and the ability of the system itself to radiate electromagnetic interference to the outside.

A shielded cable is a special type of cable that shields and insulates the cable surroundings to reduce electromagnetic interference (EMI). The shield is a layer of material that protects the cable from external electric and magnetic fields. It allows external electromagnetic radiation and magnetic field radiation to enter the ground directly without interfering with the internal wires.

MYP Mining Cable Specifications Constant Voltage and Mining Mobile Rubber Sheathed Flexible Cable (This product is suitable for copper core rubber sheathed flexible cable for mobile equipment with rated voltage and below.)

Shielded cable characteristics.

Model Name Main Purpose.

my) Mining mobile rubber sheathed flexible cable The rated voltage is the power connection of various underground mobile coal mining equipment;

MYP) Mine mobile shielded rubber sheathed flexible cable The rated voltage is the power connection of various underground mobile coal mining equipment;

MYP) Mine Mobile Shielded Rubber Soft Cable The rated voltage is the power connection of various underground mobile coal mining equipment.

Parameters related to shielded cables.

Number of cores Conductor Sheath Nominal Thickness (mm) in the cable. Coal Outer Diameter Cable reference weight (kg km).

Nominal cross-section (mm2) Power core.

Power core Ground core Insulation nominal thickness (mm) Small value Large value Small value Large value UC ucp

Number of cores, conductor, cable outer diameter, cable reference weight (kg km).

Nominal cross-section (mm2) Power core Sheath nominal.

Power wire core Ground wire core Insulation nominal thickness (mm) Thickness (mm) Small value Large value.

1. The insulation resistance between the main core of the cable insulation and between the main core and the ground wire shall not be less than 100m km when converted to +20.

2. The transition resistance of the main core shield layer is not higher than 3K when converted to 20.

3. Product standards:

What is the purpose of installing a shield in a cable, and is it okay if it is not installed? Today is a long time to see.

The insulation layer is added to the copper wire network, and there is a layer of insulation outside.

1. Screen Bi Zen shielding effect: the current through the electric dry force cable is relatively large, and a magnetic field will be generated around the current, in order not to affect other components, so the mega hole with the shielding layer can shield the electromagnetic field in the cable.

2. Grounding protection: If the core of the cable is damaged, the leaked current can flow along the shielding layer such as the grounding network, and then the shielded cable will play a role in safety protection.

3. Shielded wires are used for general household signal lines to prevent external electromagnetic waves from interfering with the signal, which is also called shielded cables.

a.Reduced signal attenuation orange pants.

b.Reduced physical attrition.

c.Reduces electromagnetic interference.

d.Reduces electromagnetic interference radiation and sensitivity to external circular simple interference.

Correct Answer: Reduces electromagnetic interference, radiation and sensitivity to external interference.

Different cable uses are different.

In the field of communication: mainly to reduce interference.

Power cable: mainly used for grounding, in the short circuit to introduce the current into the ground, at the same time, some cable shielding can be used as armor to protect the cable itself to protect the cross-linked cable above 6kv: the inner shield to prevent the conductor burr from damaging the insulation, semi-conductive outer shield for experiments.

The shielding aluminum sleeve above 66kv plays a role in protection, grounding, waterproofing, etc. In nuclear power and other fields, it is used to protect against radiation.

What is the purpose of installing a shield in a cable, and is it okay if it is not installed? Today is a long time to see.

**Cables and connectors are wrapped with a metal material shielding layer, which can effectively filter out unnecessary electromagnetic waves (which is also the method used by most shielding systems), for the shielding system, it is not enough to have a metal shielding layer, and more importantly, the shielding layer must be completely well grounded, so as to effectively introduce the interference current into the ground.

However, during the actual construction, there are some difficulties that cannot be ignored in the shielding system: due to the harsh requirements of the shielding system for grounding, it is very easy to cause poor grounding, such as excessive grounding resistance, unbalanced grounding potential, etc., so that the potential difference will be generated between some two points of the transmission system, and then the current on the metal shielding layer will be generated, causing the shielding layer to be discontinuous and destroying its integrity.

At this point, the shield itself has become the biggest source of disruption, resulting in far inferior performance to unshielded systems. When the shield wire is transmitted at high frequencies, it needs to be grounded at both ends, which makes it more likely to create a potential difference in the shield.

It can be seen that the requirements of the shielding system itself constitute the biggest obstacle to ensuring its performance. A complete shielding system requires shielding everywhere, and once any point of shielding cannot meet the requirements, it will inevitably affect the overall transmission performance of the system. However, there are still very few network hubs or computers on the market that have native shielding support, so it is difficult to shield the entire transmission link.

The benefit of shielding in cables is the reduction of electromagnetic interference, radiation, and sensitive voltaic wear to external interference.

As the name suggests, it is a cable with anti-external electromagnetic interference ability formed by adding a shielding layer to the transmission cable. The so-called "shielding" on the cable structure is also a measure to improve the distribution of the electric field. The cable conductor is made of stranded wires, which is easy to form an air gap between it and the insulation layer, and the surface of the conductor is not smooth, which will cause the electric field to concentrate.

The shielding layer of this cable is mostly made of metal wire braided into a network or metal film, and there are many different ways of single shielding and multiple shielding. A single shield is a single shield or shield film in which one or more wires can be wrapped. The multi-shielding method is a plurality of shielding nets, and the shielding film is co-located in a single cable.

Some are used to isolate electromagnetic interference between wires, while others are used to enhance the shielding effect. The mechanism of action of shielding is to ground the shield layer to isolate the inductive interference voltage of the external connection to the wire.

The type of shielded cable

1. Semi-conductive shielding: The semi-conductive shielding layer is usually arranged on the outer surface of the conductive wire core and the outer surface of the insulating layer, which are called the inner semi-conductive shielding layer and the outer semi-conductive shielding layer respectively. Semi-conductive shielding is made of semi-conductive material with very low resistivity and thin thickness.

The inner semi-conductive shielding layer is to homogenize the electric field on the outer surface of the wire core and avoid partial discharge of the conductor and insulation due to the unsmooth conductor surface and the air gap caused by the twisting of the wire core. The outer semi-conductive shielding layer is in good contact with the outer surface of the insulation layer, and has the same potential as the metal sheath, so as to avoid partial discharge with the metal sheath due to defects such as cracks on the insulation surface of the cable.

2. Metal shielding: For medium and low voltage power cables without metal sheaths, in addition to the semi-conductive shielding layer, a metal shielding layer should be added. The metal shield is usually made of copper strip or copper wire, which mainly plays the role of shielding the electric field.

Because the current passing through the power cable is relatively large, a magnetic field will be generated around the current, in order not to affect other components, so the screen gap shield layer can shield this electromagnetic field in the cable.

Moreover, the cable shield can play a certain role in grounding protection, if the cable core is damaged, the leakage current can flow into the grounding network along the shielding layer, and play a role in safety protection. It can be seen that the role of cable shielding is still very large.

<> pro

Hello I am glad to answer for you, the difference between shielded cable and ordinary wire is that it adds a layer of shielding layer outside the conductor to reduce electromagnetic interference and improve the ability to resist interference. Therefore, although shielded cables can transmit electrical energy, their main purpose is not to use them as ordinary wires. Shielded cables are usually used in applications where the environment is sensitive to electromagnetic interference, such as industrial automation, medical equipment, radar systems, etc., and high signal transmission quality is required.

Ordinary wires are more used in construction, household appliances and other common purposes. If you only need to transmit electrical energy, it is recommended to choose a normal wire that meets local electrical safety standards instead of using a shielded cable.