The so-called copper stranded wire refers to a new type of composite wire with low-carbon steel as the core, which is processed by copper plating, and several single wires are twisted according to certain rules. Copper stranded wire is a kind of soft connecting wire for power transmission and distribution, electrical devices (such as transformer and electric furnace), electronic and electrical equipment and thyristor components. In addition, the copper stranded wire can also be used as the grounding wire for electrical work. The copper stranded wire is realized by the equal angular speed rotation of the stranded wire around the stranded wire axis and the uniform forward motion of the stranded wire. Copper strands can be divided into hard copper strands and soft copper strands. They have their own characteristics and uses.

What are the advantages of copper strands?

1. Copper plays a role in conducting weak current signals, while steel wire plays a supporting role. According to the different methods of copper wrapping to steel wire, it is mainly divided into electroplating, coating, hot casting / dipping and electroforming. The product not only has the strength and toughness of steel, but also has the good conductivity and corrosion resistance of copper. Compared with copper single wire, it has the advantages of low density, high strength and low cost. It is an updated product of traditional pure copper single wire.

2. The use of copper stranded wire can reduce the operating temperature. Compared with the single stranded wire with the same cross-sectional area, the stranded wire has higher mechanical flexibility. It is widely used in lines with high "Q" value.

3. Copper stranded wire is made of high-quality copper wire and tinned soft copper wire. After toughening during processing, the finished product is soft, neat and beautiful.

4. Advantages of hard and soft copper strands:

(1) Hard copper stranded wire: strong tensile resistance, relatively strong, low resistance and good conductivity

(2) Soft copper stranded wire: usually thinner than hard copper stranded wire, with particularly high conductivity and toughness.

5. Advantages of insulated copper stranded wire: high tension resistance.

What are the advantages of copper stranded wire process?

1. Unique manufacturing process: the cold rolling and hot drawing production process is adopted to realize the high combination of copper and steel.

2. Excellent corrosion resistance: the surface copper layer is thick (the average thickness is greater than 0.3mm), with strong corrosion resistance and a service life of more than 30 years.

3. Better conductivity: as the surface red copper material has excellent conductivity, its own resistance is far lower than that of conventional materials.

4. Wide range of application: the product is suitable for soil conditions with different humidity, temperature and pH value.

5. Safe and fast use: complete accessories, special connecting pipes or hot-melt flux produced by the company are used for connection, with firm joints and convenient installation, which greatly improves the construction efficiency.

6. Lower construction cost: compared with the traditional pure copper grounding, the cost is greatly reduced.

What are the application fields of copper strands?

1. Military coated wire conductor; Electric power industry grounding rod; Braided shield wire of power cable; Connectors of various electronic components; Reinforced conductor core of special cable; Overhead lines for power transmission and telephone lines; Conductors of parallel dual core telephone subscriber communication lines; Catenary and sliding contact line of electrified railway and rail transit line; Inner conductor material of coaxial cable of CATV subscriber line and incoming line; Internal conductor of computer LAN, access network cable and field cable.

2. Application fields of hard copper stranded wire and soft copper stranded wire:

(1) Hard copper stranded wire: hard copper stranded wire is often used in places that need to conduct electricity and have high tension requirements, such as distribution lines, building conductors, and cables for power transmission.

(2) Flexible copper stranded wire: the most common conductor we see is the conductor of household appliances. It is also applicable to electrical machinery as the conductor of power cables and communication equipment. The specification of flexible copper stranded wire is 15-7 Φ 5、12-7 Φ 5、9-7 Φ 5, etc., with 15-7 Φ 5 as an example, 5 represents steel wire with nominal diameter of 5.0mm, 7 Φ 5 means that 7 such steel wires form a steel strand, while 15 means that 15 such steel strands form a bundle of reinforcement. The general meaning is "a bundle of reinforcement composed of 15 steel strands with 7 wires (with a total diameter of 5mm, and the diameter of each wire is about 1.7mm)".

3. Application field of insulated copper stranded wire: there is a circle of insulating glue or plastic outside the copper stranded wire. The copper stranded wire is mainly made of the high tensile resistance of the copper stranded wire, which can be used for special locks, brake lines on bicycles, battery cars and motorcycles. It can also be used as a line for drying clothes.

Correct identification method for copper strands?

1. First: look at the appearance of copper stranded wire. The purchase of copper stranded wires should be observed from the appearance. Generally, good copper stranded wires have bright appearance, obvious damage and scratch, and no obvious discoloration caused by oxidation reaction. The outer color is uniform, with black spots and cracks, and the distance is uniform and regular. Meeting the above standards is a good choice for copper strands.

2. Second: see the specification and model of copper stranded wire. The size and specification of the wire shall be observed for the selection of copper stranded wire. Generally, the wire drawing of copper stranded wire shall be within the specified range and shall not exceed the process standard, otherwise it shall be regarded as invalid stranded wire. The single wire constituting the stranded wire must meet the characteristics of uniformity and tidiness and conform to the process rules.

3. Again: look at the composition of the copper stranded wire structure. When purchasing copper stranded wires, we should also observe the distribution and composition of the stranded wires to see whether there are short wires, missing wires, loose strands and overlapping strands. Generally, these can be observed with the naked eye. We need to carefully observe and inspect the quality of copper stranded wires. We cannot select unqualified products to produce wires and cables, which will cause serious safety accidents.

4. Finally: see the copper strand welding process. For the purchase of copper strands, attention should also be paid to whether the welding process is reliable, whether the welded interface part is neat, and whether there are service and line irregularities. The welded interface shall be maintained neatly, leveled, rounded, and shall not be stuck. Generally, the diameter of the welding head shall not exceed 0.2 mm; The welding of two adjacent copper strands shall be kept at a certain distance and evenly spaced.

Source: Jiangxi Copper

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