The Advantages of Copper Cable and Aluminum Cable

We all know that copper and aluminum are the main materials of wire and cable, so who knows what advantages copper cable and aluminum cable have?

1.Low resistivity: the resistivity of copper-core cable is 1.68 times lower than that of aluminum-core cable, with less energy consumption.

2.Good ductility: the extension rate of copper for electrical use is more than 30%, while that of aluminum alloy is only 18%.

3.High Strength: The promising strength of copper is much higher than that of aluminum.At room temperature, the promising force of copper is 7~28% higher than that of aluminum.And the stress at high temperature, the difference between the two is greater.

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

5.Good stability, corrosion resistance: aluminum core is easy to oxidize and be corroded, copper core is relatively stable, strong oxidation resistance.

6.Large carrying capacity: copper core resistivity is low, so the copper core cable can pass the maximum current carrying capacity is 30% higher than the aluminum core.

7.Low heating temperature: under the same current, the calorific value of the copper core cable with the same cross section is much smaller than that of the aluminum core cable, making the operation safer.

8.Low power consumption: Due to the low resistivity of copper, it is obvious that the copper cable has a lower power loss than the aluminum cable.This is conducive to improving the efficiency of power generation and protecting the environment.

9.Oxidation resistance, corrosion resistance: copper core cable connector performance is stable, no accident due to oxidation.The unstable joint of aluminum core cable often causes accidents due to the increase of contact resistance and heating caused by oxidation.As a result, the accident rate is much greater than the copper core cable.

10.Convenient construction: the copper core is flexible and the allowable bending radius is small, so it is convenient to turn and easy to pipe;Copper core fatigue resistance, repeated bending is not easy to break, so convenient wiring;The copper core has high mechanical strength and can bear large mechanical tension, which brings great convenience to the construction laying and also creates conditions for mechanized construction.

The discrimination of flame-retardant cables

Nowadays, electricity is used more and more frequently, and life is inseparable from electricity. Today, the editor brings you a mine-used flame-retardant cable worthy of trust in mines.
Advantages and disadvantages of mine flame retardant cables
The characteristic of flame-retardant cable is to delay the spread of flame along the cable so that the fire will not expand. Because of its low cost, it is a large number of cable varieties used in fire-resistant cables. Regardless of whether it is a single cable or a bundle laying, the cable knows that the flame spread can be controlled within a certain range when burning, so it can avoid major disasters caused by fire and prolonged combustion, thereby improving the fire protection level of the cable line.
The difference between mine flame-retardant cable and fire-resistant cable

1 The difference in principle
The principle of fire-resistant cables is different from that of flame-retardant cables. The flame-retardant principle of halogen-containing cables is based on the flame-retardant effect of halogen, and the flame-retardant principle of halogen-free cables is to extinguish the fire by reducing the temperature of the precipitated water. Fire-resistant cables rely on the fire-resistant and heat-resistant characteristics of the mica material in the refractory layer to ensure the cable It also works fine during a fire.
2 The difference between structure and material

The structure and materials of fire-resistant cables are different from those of flame-retardant cables.

Carbon fiber composite coreconductor

Carbon fiber composite wire is a high-strength carbon fiber composite power transmission wire. It has a core and a ring-shaped conductive layer wrapped around the core. The core is a conductive core composed of carbon fiber, and there is a composite conductive core composed of carbon fiber. It is composed of carbon fiber and aluminum or copper wire twisted.
This kind of carbon fiber composite core wire has many advantages and is the strength of contemporary scientific and technological development. It uses the high strength and corrosion resistance of carbon fiber to produce a new type of wire. Compared with the conventional steel core aluminum stranded wire, the carbon fiber The fiber composite core conductor has obvious advantages. It has many characteristics such as light weight, high tensile strength, high temperature resistance, radiation resistance, and large current carrying capacity. It can be said that all aspects of performance are upgraded.

The carbon fiber composite core wire has a very strong transmission capacity. It can effectively reduce power loss during the process of transporting electrical energy. It has high heat resistance and can continue to work under a high temperature environment of 160 degrees, even in a peak environment. Can fully meet the demand.

The tensile strength of general steel wire is 1240MPa, while the strength of carbon fiber composite core can reach more than 2400MPa, and the strength safety factor of carbon fiber composite core wire is increased by nearly 2 times. Not only the strength is enhanced, the expansion coefficient of the carbon fiber composite core wire is also very small, which avoids the thermal expansion sag of the traditional steel core cable. The height of the poles and towers can be reduced, and the distance between the poles can be increased, thereby reducing the transmission line corridors and saving land resources. This makes it not only have a strong comprehensive benefit advantage in the transformation of the old line; even in the construction of the new line, it also has a competitive advantage.

Classification of home improvement wires

BV wire, full name copper core PVC insulated wire, referred to as plastic copper wire. That is, a general-purpose single-core hard conductor non-sheathed cable with a diameter of 1mm or more.
It is suitable for wires used in power installations, household appliances, meters and telecommunication equipment with AC voltage of 450/750 and below. It has the characteristics of acid and alkali resistance, oil resistance, moisture resistance, mildew resistance, and long service life. Because it has a certain degree of hardness, it is more convenient in straightening and folding corners.

BVR wire is generally a wire twisted together by 19 copper wires with a diameter of less than 1mm. It is a copper core PVC insulated flexible wire.
The letter B stands for wiring (for example: make an indoor power line and tack it on the wall);
The letter V-polyvinyl chloride plastic sheath (a V stands for one layer of insulation and two V stands for double insulation), which is a plastic insulation layer.

L stands for aluminum wire, without L stands for copper wire.
The letter R stands for soft wire. To be soft, it means to increase the number of conductors and reduce the diameter of each wire.
It is suitable for the occasions where flexibility is required for wiring and the rated voltage is lower than 450/750 with slight movement. When multiple pipes are pierced at the same time, due to the low hardness, it is easy to turn and convenient for construction. Compared with the hard wire, the production is more complicated, and the high-frequency circuit has a larger carrying capacity than the hard wire.
Classification of common specifications and models of wires
Common specifications of wires are 1.5 square, 2.5 square, 4 square, 6 square, and 10 square. The square of the wire is square millimeters, which is the size of the cross-sectional area of ​​the wire.

Points to note for cable operation and maintenance

The operation of power cable lines is extremely important in the entire power production process. Because the safety of cable lines is directly related to the production safety of enterprises and the safety of people’s lives and properties, it is extremely important to understand the operation and maintenance of power cables and lines. Things.

In the power industry, the so-called cable line actually refers to the line for the transmission of electric energy by the cable. Generally, it is composed of cables, cable intermediate joints, and electrical line ends. It also includes laying related projects, such as cable trenches, pipes, and shafts. , Tunnels, etc., according to the different construction requirements of different geographical environments, the cable lines will be adjusted according to local conditions.

Compared with overhead  conductor lines, cable lines have many advantages. One is that they are not affected by natural disasters, such as heavy rain and snow. Cable lines can better isolate these factors. The second is to make the city look neater, and the construction of cable lines will not be disturbed by the trees along the city, beautify the city, and avoid the risk of electric shock for urban people.

Sino-European submarine cable put into use this year

Submarine cables are cables wrapped with insulating materials and laid on the seabed for telecommunications transmission. Submarine cables are divided into submarine communication cables and submarine power cables. Modern submarine cables use optical fibers as materials to transmit telephone and Internet signals. In 1850, people laid the world’s first submarine cable between Calais (France) and Dover (UK). In August 1858, a British private company founded by Sellers Westfield was established in Ireland. (Europe) and Newfoundland (North America) completed the laying of the first intercontinental submarine communication cable. China’s first submarine cable was completed in 1888.

In ancient times, the rulers of the land of China were eager to get in touch with the countries of the Western Regions, so in the period of Emperor Wu of the Han Dynasty, Zhang Qian was sent to the Western Regions to make the Western Regions understand that there was a powerful Han Dynasty on the eastern continent.

Today is the era of the information Internet. The connection of cables can enable the exchange of information between various regions. According to relevant descriptions, this cable will connect China and Pakistan on land, and after that, it will pass through the seabed to the Horn of Africa. , And the focus of its final connection is Marseille in France.

Factors restricting the development of the cable industry

The cable industry has developed to now, and the overall size is very large, with a large number of companies. China has surpassed the United States to become the world’s largest cable manufacturer. However, in this rapid development process, many problems have gradually been exposed.
The first problem is that there are few large domestic cable companies, and they lack competitiveness with foreign cable companies in high-end products. Even in 2018 or so, the annual output value of the top ten companies in  ACSR cable production scale is not as good as the total output value of the industry. 20% of the total, which is in sharp contrast with developed countries. However, it is roughly the same as my country’s current economic structure, and it is basically the same as that of other industries.

The second problem is that the homogeneity of products is serious and the market competition is fierce. There are a large number of cable companies in China, most of which are small and medium-sized enterprises. The operation mode, management and technical level of these companies present serious homogeneity problems. The problem of homogenization has aggravated overcapacity. In a homogeneous product market, users are mainly concerned with price, and competition is almost entirely concentrated on price. The greater the surplus of homogenized production capacity, the fiercer the price competition, the thinner the profit, and the more difficult it is for a company to survive.

The third problem is that the pressure of funds is huge. The xlpe cable industry is a typical heavy-material and light-industry industry and a capital-intensive industry. Therefore, the cable industry is always facing the pressure of the capital chain. The most significant phenomenon is the application of many companies. The total amount of money collected accounts for a high percentage of annual revenue, many of which are 30%. This also leads to financial difficulties for companies, and China’s cable industry is mostly small and medium-sized enterprises, so these companies are generally facing financial pressures. The problems of difficult financing, expensive financing, and high financing costs have sharply increased the risks in the capital chain of enterprises. In the past two years, due to the tightening of the entire financial system, many companies have found it difficult to cope and shut down and revert.

Talking about the definition and function of weak current wires

1. Definition of weak current wires
Weak current cables refer to cables used for security communications, electrical equipment and related weak current transmission. There is no strict boundary between “wire” and “cable”. Generally, products with a small number of cores, small product diameters, and simple structures are called wires, those without insulation are called bare wires, and the others are called cables; those with a larger conductor cross-sectional area (greater than 6 square millimeters) are called large wires. Small (less than or equal to 6 square millimeters) are called small wires, andXLPE insulated cables are also called cloth wires.
RVS fire wire
2. The role of weak current wires
The main processing object of weak wires is information, that is, the transmission and control of information, which is characterized by low voltage, low current, low power, and high frequency. The main consideration is the effect of information transmission, such as the fidelity, speed, breadth and reliability of information transmission, that is, the line that realizes the transmission of weak electrical signals.

RVVP shielded wire
3. Types of weak current wires
1. Telephone line, large logarithmic HYA: wire specifications are 2*1, 2*0.5, 4*1, 4*0.5, large logarithmic HYA has 10 pairs, 20 pairs, 30 pairs, 50 pairs, 100 pairs And so on, are all in pairs.
2. Video cable SYV series and SYWV series: SYV is a video cable for monitoring, such as video cable SYV75-5; SYWV is a cable TV cable, which belongs to physical foaming; there is also an elevator frequency cable SYXV.
3. Power cord RVV series: mainly used for weak current power supply, sometimes also used for control, such as RVV2*1.0.
4. RVS, RVB, RVVB series, including common type, fire-resistant type, and flame-retardant type. RVS is generally used in fire fighting systems.
5. Network cable: UTP is unshielded, FTP is shielded, such as: Category 5 unshielded network cable UTPCAT.5e, Category 6 shielded network cable is FTPCAT.6e.
6. Shielded wire RVVP series: The appearance is similar to the RVV power cord, except that there is an extra layer of shielding net in the structure, and a letter P is added to the model. Generally, wires with P have a shielding layer.

What kind of cable is HFTGB?

HFTGB series of flexible synthetic mineral insulated fireproof cables are made of copper stranded wire as conductor, wrapped with mineral oxygen barrier, extruded with synthetic mineral insulating material, and then covered with synthetic mineral belt, and the outer layer is spirally wrapped with non-magnetic stainless steel belt. Where the metal sheath is specifically required to not be exposed, a low-smoke, halogen-free sheath can be added to the outside.
Basic product parameters:
Conductor: The conductor is a round copper stranded wire.
Insulation: mineral oxygen barrier, then extruded synthetic mineral insulating material
Filling layer: The synthetic mineral belt is covered with a mineral compound.
Sheath: Spiral wrapped with non-magnetic stainless steel belt.
Use: This product is the first in China, and there is no prototype in the world. Compared with the BTTZ series of metal outer sheathed cables, the product maintains ultra-high fire resistance and electrical resistance. It can achieve continuous large length and multi-core cable within 120 mm, which overcomes the shortcomings of too many joints, and stainless steel The mechanical properties and environmental corrosion resistance of the outer sheath are greatly improved.
Special cables
Features: Flexible synthetic mineral insulated fireproof cable adopts a flexible structure to make up for the defects of hard structure, flammability, and toxicity. It also has some advantages that other cables cannot have, such as: fire resistance, large current carrying capacity, and impact voltage resistance , Mechanical damage resistance, halogen-free, non-toxic, explosion-proof, waterproof, anti-rat bite, corrosion resistance, long life, safety, overload resistance, high temperature resistance, heat insulation and low comprehensive cost characteristics, flexible synthetic mineral insulated fireproof cable HFTGB( Y) The process structure of the product is exactly the same as that of the traditional cable. It successfully solves the many shortcomings of the product determined by the production process of the magnesium oxide mineral insulated cable (BTTZ). At the same time, the power and the communication fireproof cable are integrated, so that in the event of a fire Keep communication information unblocked.
product description:
HFTGB cable is the first in China, and there is no prototype in the world. Compared with the BTTZ series of metal outer sheathed cables, the product maintains ultra-high fire resistance and electrical resistance performance. It can achieve continuous large length and multi-core cable within 120mm2, which overcomes the shortcomings of too many joints, and The mechanical properties and environmental corrosion resistance of the stainless steel outer sheath are greatly improved. However, the structure of this product is also complicated, the conductive performance of the stainless steel outer sheath is weak, and it cannot replace the grounding wire like a copper sheath. The overall cost is relatively high among the major categories of mineral cables.

Product performance standards:
1. BS 6387:1994 performance requirements for cables to maintain circuit integrity under flame conditions;
2. Follow the corresponding corporate standards.
Product characteristics:
Voltage level: 0.6/1kV, working voltage is 500V for light load and 1000V for heavy load.
Working environment: The long-term working temperature is 70°C for the sheath; the long-term working temperature of the mineral insulated cable is 105°C where no one can touch it.
1. Installation conditions: It is suitable for the open laying of the ladder frame, and the installation methods such as bridge frame, pipe-through, and burying can also be adopted;
2. Installation process: there are special connectors, please refer to the manufacturer’s “installation instruction manual” for details;
3. Matters needing attention: The bending of the stainless steel metal sheath must be carried out in a reliable way. A single single-core cable is not suitable for laying directly through a metal pipe.

A qualified cable, these steps can not be less

A qualified cable, which can not be short of 600V Overhead Aerial cable 54.6m㎡ as a means of transmitting electrical energy and communication signals, is undoubtedly the existence of blood vessels and nerves in the modern era of the Internet, is the key to manufacturing in most industries today.

Chinese cable industry is now a large-scale, is a major international cable manufacturing country, the domestic cable manufacturing industry is only the second largest manufacturing industry after automobiles, but the huge industry has also spawned a lot of chaos and speculators, many small cable enterprises, in order to seize the market, maliciously underpricing, producing unqualified cable and wire without enough work and materials, and even worse, using fake cable and wire to list well-known cable and wire brands for sale, has had a very bad impact on the industry.

In the production of cable, in strict accordance with the production requirements and procedures, and conduct a comprehensive testing and testing to ensure that URD Cable out of the factory is of high quality, today to talk about the production of a qualified cable, what are the key steps? First of all, of course, it is strictly controlling the purchase of raw materials.

If it is a good raw material, then the quality and life performance of the cables produced will be greatly reduced. Meanwhile, Shenghua cable will strictly control the purchase, production, transportation, sales and other links, compare the raw materials from the suppliers in all aspects to ensure that the raw materials obtained are of high quality and durable; with good production materials, the next step is the production process. Huaxing cable has the latest cable production equipment.

During the production process, it also requires operators to work strictly in accordance with the requirements, whether it is extrusion machine series, drawstring machine series, stranding machine series, wrapping machine series, Huaxing cable are to achieve strict production requirements. Inspection is the most important link in the cable production process, Shenghua cable is of course also attached great importance to, for a long time, huaxing cable has always insisted on the survival of quality, to ensure safety, to service credibility, to management to promote efficiency, to forge ahead. Through the strict check and inspection of each link of the production cable, the product quality is ensured and the customer requirements are met.