Shenzhen Lianjiaxiang Technology Co., Ltd.

Copper core cable has more advantages than aluminum core cable:

1. low resistivity: the resistivity of aluminum core cable is about 1.68 times higher than that of copper core cable.

2. good ductility: the ductility of copper alloy is 20~40%, that of electrical copper is more than 30%, and that of aluminum alloy is only 18%.

3. high strength: the allowable stress of copper is 7~28% higher than that of aluminum at room temperature. Especially the stress at high temperature, the difference between them is very far.

4. fatigue resistance: aluminum is easy to break after repeated bending, while copper is not. In terms of elasticity index, copper is also about 1.7~1.8 times higher than aluminum.

5. good stability and corrosion resistance: the copper core is oxidation-resistant and corrosion-resistant, while the aluminum core is prone to oxidation and corrosion.

6. large current carrying capacity: due to low resistivity, the allowable current carrying capacity (the maximum current that can be passed) of copper core cable with the same section is about 30% higher than that of aluminum core cable

7. low voltage loss: due to the low resistivity of copper core cable, when the same current flows through the same section. The voltage drop of copper core cable is small. Therefore, the same transmission distance can ensure higher voltage quality; In other words, under the condition of allowable voltage drop, the transmission of copper core cable can reach a long distance, that is, the power supply coverage area is large, which is conducive to network planning and reduces the number of power supply points.

8. low heating temperature: under the same current, the heating capacity of copper core cable with the same section is much smaller than that of aluminum core cable, making the operation safer.

9. low energy consumption: due to the low resistivity of copper, compared with aluminum cable, the power loss of copper cable is low, which is obvious. This is conducive to improving the utilization rate of power generation and protecting the environment.

10. oxidation resistance and corrosion resistance: the connector of copper core cable has stable performance and will not cause accidents due to oxidation. The unstable joints of aluminum core cables often cause accidents due to the increase of contact resistance and heating due to oxidation. Therefore, the accident rate is much higher than that of copper core cable.

11. convenient construction: ① the copper core is flexible and the allowable bending radius is small, so it is convenient to turn and pass through the pipe; ② The copper core is anti fatigue and not easy to break after repeated bending, so the wiring is convenient; ③ The copper core has high mechanical strength and can bear large mechanical tension, which brings great convenience to the construction and laying, and also creates conditions for mechanized construction.

Advantages of aluminum core cable over copper core cable

1. low price: the price of copper pole is 3.5 times that of aluminum pole, and the proportion of copper is 3.3 times that of aluminum. Therefore, aluminum core cable is much cheaper than copper core cable, which is suitable for low-cost projects or temporary power consumption.

2. the cable is very light: the weight of aluminum core cable is 40% of that of copper core cable, and the construction and transportation costs are low.

3. oxidation resistance and corrosion resistance: aluminum reacts quickly with oxygen in the air to form an oxide film, which can prevent further oxidation. Therefore, aluminum conductor is the necessary material for high voltage, large section and long-span overhead power transmission.

Although aluminum core cables are cheap, copper cables have outstanding advantages in cable power supply, especially in the field of underground cable power supply. The underground use of copper core cable for power supply has the characteristics of low accident rate, corrosion resistance, high reliability and convenient construction and maintenance. This is also the reason why copper cable is mainly used in underground cable power supply in China.

The coaxial cable takes hard copper wire as the core and is wrapped with a layer of insulating material. This layer of insulating material is surrounded by a dense woven mesh conductor, and a layer of protective material is covered outside the mesh. There are two widely used coaxial cables. One is a 50 ohm cable, which is used for digital transmission. Because it is mostly used for baseband transmission, it is also called baseband coaxial cable; The other is a 75 ohm cable for analog transmission. This difference is caused by historical reasons, not by technical reasons or manufacturers. The

This structure of coaxial cable makes it have high bandwidth and excellent noise suppression characteristics. The bandwidth of the coaxial cable depends on the cable length. 1km cable can reach 1gb/s~2gb/s data transmission rate. Longer cables can also be used, but the transmission rate should be reduced or intermediate amplifiers should be used. At present, coaxial cable is largely replaced by optical fiber, but it is still widely used in cable TV and some local area networks.

1. VV: PVC insulated, PVC sheathed power cable

It can be laid indoors, in tunnels, cable trenches, pipelines, places with flammability and serious corrosion, but can not bear external mechanical forces. If it is necessary to bear external mechanical force, steel tape armour shall be added.

2. YJV: XLPE insulated, PVC sheathed power cable

It can be laid indoors, in tunnels and in pipelines, and can withstand certain laying traction, but the cable can not bear external force. Single core cables are not allowed to be laid in magnetic material pipelines. If it is necessary to bear external mechanical force, steel tape armour shall be added.

3. Zr-vv: flame retardant PVC insulated, PVC sheathed power cable

It can be laid indoors, in tunnels, cable trenches, pipelines, places with flammability and serious corrosion, but can not bear external mechanical forces. If it is necessary to bear external mechanical force, steel tape armour shall be added.

Features: in the case of open fire combustion, remove the fire source and automatically extinguish within 12s.

4. Zr-yjv: flame retardant XLPE insulated, PVC sheathed power cable

It can be laid indoors, in tunnels and in pipelines, and can withstand certain laying traction, but the cable can not bear external force. Single core cables are not allowed to be laid in magnetic material pipelines. If it is necessary to bear external mechanical force, steel tape armour shall be added.

Features: in the case of open fire combustion, remove the fire source and automatically extinguish within 12s.

5. Nh-vv: fire resistant PVC insulated, PVC sheathed power cable

It can be laid indoors, in tunnels, cable trenches, pipelines, places with flammability and serious corrosion, but can not bear external mechanical forces. If it is necessary to bear external mechanical force, steel tape armour shall be added. It is suitable for special occasions, such as large capacity power plants, nuclear power plants, underground railways, high-rise buildings, etc.

Features: in the burning environment, protect the normal operation for 90min.

6. Nh-yjv: fire resistant XLPE insulated, PVC sheathed power cable

It can be laid indoors, in tunnels and in pipelines, and can withstand certain laying traction, but the cable can not bear external force. Single core cables are not allowed to be laid in magnetic material pipelines. If it is necessary to bear external mechanical force, steel tape armour shall be added.

It is suitable for special occasions, such as large capacity power plants, nuclear power plants, underground railways, high-rise buildings, etc.

Features: keep normal operation for 90min in the burning environment.