Copper-clad steel stranded wire
Copper clad steel stranded wire is a new composite material made of low carbon steel core and copper plated. It is widely used in grounding conductors of electric power, communication and petrochemical industries. The copper layer of the copper clad steel strand and the steel are tightly combined in a molecular form, and no dislocation, warping or cracking occurs. Copper clad steel stranded wire has the advantages of light weight, copper material, low cost, etc. It is a replacement product of traditional copper wire. Copper clad steel strands have both strength and toughness of steel and copper conductivity, weldability and corrosion resistance, especially at relatively large inrush currents, as skin effect increases with increasing current intensity Therefore, the electrical conductivity of the copper clad steel wire can be compared with the copper wire of the same cross-sectional area.
Characteristics and technical advantages of copper clad steel strands:
1. The copper clad steel strand has a soft structure, large surface area, low cost and good grounding effect.
2. The copper-clad steel stranded wire is packaged in a disk, with fewer joints and convenient transportation.
3. Copper clad steel strands are manufactured by special process, with high strength, strong corrosion resistance and long service life.
4. The skin effect principle, excellent electrical conductivity, copper-clad steel strand magnetic properties are conducive to the diffusion and transmission of electromagnetic fields.
Copper clad steel strandss’ advantages compare to pure copper strands:
1. The copper clad steel strands are less attenuated at low frequencies than pure copper strands. The transmission loss is small at high frequencies and the transmission efficiency is high. The electrical performance indicators are completed to meet the needs of the system, attenuation, return loss, characteristic impedance and other performance indicators. Not less than pure copper core cable;
2. Under the same section and condition, the mechanical strength of copper clad steel strand is twice that of solid copper stranded wire, which can withstand large impact and load. It is higher when used in places with harsh environment and frequent movement. Reliability and fatigue resistance, long service life;
3. Copper clad steel strands can be made into cables with different electrical conductivity and tensile strength, and their performance includes almost all mechanical and electrical properties of copper alloys;
4. Copper-clad steel stranded wire is made of steel instead of copper, which reduces the cost of copper and greatly reduces the consumption of copper. It meets the needs of a resource-saving society. Under the current situation of a sharp rise in copper prices, the price of pure copper cable continues to rise. Reduce the construction cost of copper clad steel strands.
Copper clad steel strands have been used for a long time, and copper clad steel strands are used for telephone transmission. Copper clad steel strands are used in many industrial control systems and in places with high interference and long-distance transmission. The LAN used is also a twisted pair. Twisted pair is so widely used because of its many advantages such as strong anti-interference ability, long transmission distance, easy wiring, and low price. Copper clad steel stranded wire and copper clad steel stranded cable video transmission equipment are very cheap, not only do not increase the system cost, but the cost is much lower than the coaxial cable when the distance increases. Therefore, the use of twisted pair transmission in the monitoring system has obvious advantages:
1. The transmission distance is long and the transmission quality is high. The copper-clad steel stranded wire is used to transmit the video signal, and the dedicated transmitter is connected to the front end, and the dedicated receiver is connected to the control center. This twisted pair transmission equipment is cheap and easy to use, requires no special knowledge, and does not have much operation, one installation, and long-term stable work. Due to the advanced processing technology used in the twisted pair transceiver, the ground copper wire strand is compensated for the attenuation of the video signal amplitude and the attenuation difference between different frequencies, maintaining the brightness and color of the original image and real-time performance. When the transmission distance reaches 1 km or far, the image signal is substantially free of distortion. If the relay method is used, the transmission distance will be far. Due to the use of the common 5 types of unshielded cables or ordinary telephone lines that are widely used at present, the purchase is easy and the price is also very cheap, which brings great convenience to engineering applications.
2. Convenient wiring and high cable utilization. A pair of regular telephone lines can be used to transmit video signals. In addition, any one of the five types of unshielded twisted pair cables widely installed in a building can transmit one video signal without additional wiring. Even if it is rewiring, Category 5 cable is easier than coaxial cable. In addition, there are 4 pairs of twisted pairs in a Category 5 cable. If a pair of wires is used to transmit video signals, the other pairs of wires can also be used to transmit audio signals, control signals, power supplies or other signals, and the cable is improved. The utilization rate avoids the troubles caused by separate wiring of various signals and reduces the construction cost.
3. Strong anti-interference ability. Copper clad steel strands can effectively suppress common mode interference, even in strong interference environments, the twisted pair can transmit image signals. Moreover, several pairs of twisted pairs in one cable are used to transmit different signals, and no interference occurs between them.
Since the copper clad steel strands also have a large attenuation of the signal, the frequency of the signal cannot be too high when the transmission distance is long, and the high speed signal such as Ethernet can only be limited to 100 m. For video signals, the bandwidth reaches 6MHz. If it is transmitted directly in the twisted pair, it will also attenuate greatly. Therefore, the video signal must be transmitted over long distances on the twisted pair. It must be amplified and compensated. Copper clad steel strands Video transmission equipment is the completion of this function. After adding a pair of twisted pair video transceivers, the image can be transmitted to 1 to 2 km.