Functions of three braids in wires and cables_Anhui Honglin Instrument Cable Co., Ltd.

Functions of three braids in wires and cables

Author：hlyb Add Time：2016-03-09 16:01:37

The cable structure is complex and has a complex sheath layer, while the wire structure is relatively simple. Some * * * have conductors and insulating layers, Some have only woven and waxed lightweight protective layer or coated with a lightweight soft protective layer. The protective covering layer outside the insulating core or formed cable core is called the cable protective layer (the protective covering layer outside the protective layer is called the outer protective layer). The main function of the protective layer is to protect the insulating layer. Its main properties are moisture-proof, oil-proof, anti-corrosion, sunlight aging and flame resistance, And mechanical protection (the function of the outer protective layer is mainly to strengthen the mechanical protection of the cable, steel wire weaving and collision), and also has the functions of anti electricity, anti magnetism and dry resistance. From the perspective of wire and cable protective layer, weaving is one of many kinds of protective layers or outer protective layers of wire and cable. However, according to the materials used for wire and cable braiding layer and different parts of braiding layer in wire and cable structure, The role of braids is obviously different

Wire and cable braiding is mainly composed of three basic structural elements: fiber braid, metal braid and steel wire braid

1、 The function of fiber braid is a form of light protective layer for wires. Its main function is to protect the insulation from or less from the erosion of various light, heat, moisture, low temperature, acid-base gas and external mechanical force, so as to ensure the safe operation of wires. For cables, fiber braid is often in the middle of the protective layer, In order to enhance the tear strength of the protective layer, for example, the reinforced sheath is to add cotton yarn, hemp and other fiber braids in the middle of the rubber or plastic protective layer to improve the strength of the protective layer

2、 Function of metal braid metal braid mainly includes copper wire braid and steel wire (iron wire) braid,

The main functions of steel wire weaving are:

1. Mechanical protection, such as marine power cable CF31

2. Bear longitudinal breaking force, such as magnetic cables wc-gc and WCT for marine geological exploration. 3. Magnetic field shielding.

The main functions of copper wire weaving are:

1. Shielding effect against electromagnetic interference, such as tinned copper wire braided blue cable, copper wire braided control cable, etc

2. Eliminate the shielding effect of surface potential of power cable. It can bind power line and eliminate induced electricity, such as the total shielding of high-voltage cable. 3 Shielding effect of safety protection. Braid copper wire outside the insulation of the main core and make good contact with the ground core or use it as ground wire, which can timely respond to leakage, such as shielded mining cable.

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Functions of three braids in wires and cables