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Yangzhou Fongming Cable:Basic knowledge of braided wire and cable

Views:0     Author:Site Editor     Publish Time: 2021-12-22      Origin:Site

Wire and cable are mainly composed of three basic structural elements: conductive core, insulation layer and sheath layer. There is no strict limit on the difference between wire and cable, but in a broad sense, the cable structure is more complicated, it has a complicated sheath layer, and the wire structure is relatively simple and some only have conductors and insulation layers. The conductive core of the wire and cable is used to transmit current. In order to reduce the power loss and voltage drop, the conductive core is generally made of copper and aluminum with high conductivity. The function of the insulating layer is to prevent the current from leaking in the radial direction and to ensure safe use. Therefore, the insulating layer is required to have good electrical insulation properties, heat resistance and certain mechanical strength. The protective coating outside the insulated core or the cabled core is called the cable sheath (the protective coating outside the sheath is called the outer sheath). The main function of the protective layer is to protect the insulating layer, and its main properties are moisture-proof, oil-proof and anti-corrosion. Anti-sunlight aging, flame resistance, and mechanical protection (the role of the outer sheath is mainly to strengthen the mechanical protection of the cable, it can withstand tension and bumps), and it also has the functions of anti-electricity, anti-magnetic and dry resistance. From the perspective of wire and cable sheath, braiding is one of many kinds of sheaths or outer sheaths of wire and cable. However, according to the material used in the wire and cable braid and the different parts of the braid in the wire and cable structure, the role of the braid Obviously it is different.

1. The role of the fiber braid

2. For wires, the fiber braid is a form of its light protective layer. Its main function is to protect the insulation from all kinds of light, heat, humidity, low temperature, acid and alkali gases, etc., and external mechanical forces. The damage to ensure the safe operation of the wire. For cables, the fiber braid layer is often in the middle of the sheath to enhance the tear resistance of the sheath. For example, the reinforced sheath is to add cotton yarn, hemp and other fiber braid layers in the middle of the rubber or plastic sheath to improve The strength of the sheath.

Three, two, the role of the metal braid

4. The metal braiding layer mainly has two kinds of copper wire braiding layer and steel wire (iron wire) braiding layer. The main functions of copper wire braiding are: 1. The shielding function of anti-electromagnetic interference such as tinned copper wire braided general cable and copper wire braided Control cables, etc. 2. Eliminate the shielding effect of the surface potential of the power cable, which binds the power line and eliminates induced electricity, such as the general shield of the high-voltage cable. 3. The shielding effect of safety protection. The copper wire is braided outside the main core insulation and is in good contact with the ground core or used as a ground wire, which can respond to the leakage situation in time, such as shielded mining cables. The main functions of steel wire braiding are: 1. Mechanical protection, such as marine power cable CF31. 2. Withstand longitudinal breaking force, such as WC-GC and WCT type magnetic measuring cables for marine geological exploration. 3. Magnetic field shielding.

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