Advanced armoring methods and equipment for AAAC cables

One of the characteristics of all aluminum alloy cables  sales is the aluminum alloy tape interlocking (interlocking) armoring method. The technology of this armoring method is far superior to the steel tape wound armoring of copper cables. The use effect of the cable is also incomparable with copper cables. of. But the same is the aluminum alloy belt interlocking (chain) armoring, and there is a big gap in the armoring equipment and production technology of domestic aluminum alloy cable manufacturers.
At present, the domestic aluminum alloy armoring machine production lines are equipped with different equipment, including imported, imitated imported technology, and domestically made equipment. The current situation of domestic imported equipment is that in the equipment selection, due to the lack of aluminum alloy cable production experience and consideration of equipment investment, the most advanced one cannot be selected, or the imported second-hand equipment, or the imported host machine, in order to save investment, supporting tooling Molds were solved domestically, and the result was that the performance of imported equipment could not be reached. The product produced by this equipment has large wave peaks and poor bending performance. The armor and the armor are mutually lying structures, which cannot meet the structure required by the American technical standards. The product has poor compression resistance and is easy to peel off. As for the equipment imitating imported technology and domestically produced equipment, because the technology is not mature, the armored products produced can be imagined. Because of these various factors, the armored products produced by these equipment of domestic aluminum alloy cable manufacturers cannot meet the requirements of American technical standards.


At present, the American UMI alloy cable brand originally introduced the world’s most advanced KALMARK chain armoring machine production line from Canada. The aluminum alloy tape chain armored cable developed in accordance with American technical standards has good peak density and good bending performance. The armors are interlocking structures. The special structure interlocking between the layers can ensure that the cable withstands strong external force damage. Even if the cable is subjected to greater external pressure and external impact, the armor layer can also protect the insulation. Layer electrical performance. The structure of the aluminum alloy non-magnetic armor layer effectively improves the flame retardant level of the cable, greatly reduces the fire or fire hazard to the cable, and greatly reduces the cable eddy current loss. It truly embodies the quality and style of authentic American alloy cables.
Therefore, the fifth fact that users and related industry personnel must clearly understand is:
It is necessary to understand the technical level and production process of the armoring equipment of the aluminum alloy cable manufacturer, and whether the products produced are dense in wave crests and good in bending performance. The armor and the armor are mutually linked structures.

Installation tutorial of BVV cable

The full name of BVV wire is copper core PVC insulated PVC sheathed round sheathed wire, also known as lightweight PVC sheathed cable, commonly known as hard sheathed wire. Copper core (hard) wiring, single core round, double core flat. It is usually used for surface-mounted wires.
The letter B stands for cloth silk, and the letter V stands for polyvinyl chloride in plastics. There are also the copper core symbol, and the hard wire (ordinary single-core conductor) symbol is omitted and will not be displayed.
Structural specifications: The difference between BVV wire and BV wire is that BVV has an extra layer of sheath than BV. It is suitable for cables and wires used in power plants, household appliances, meters, and telecommunication equipment with AC voltage of 300/500V and below. The long-term allowable working temperature of the iron core does not exceed 65 degrees. Its nominal cross section is 0.75-185mm2.
Purpose: BVV wire hard sheathed wire is suitable for cables and wires of power plants, household appliances, instruments and telecommunication equipment with AC voltage of 300/500V and below, and also used for surface-mounted wires.


The difference between BVV wire and BV wire is that BVV wire has an extra layer of sheath than BV wire. It is suitable for cables and wires used in power plants, household appliances, meters, and telecommunication equipment with AC voltage of 450/750V and below. The long-term allowable working temperature of the iron core does not exceed 65 degrees. Its nominal cross-section is divided into 0.75; 1.0; 1.5; 2.5; 4; 6; 10; seven specifications ranging from 0.75-10 square.
It is suitable for wires and cables used in power plants, household appliances, meters and telecommunication equipment with an AC voltage of 450/750V and below.
Installation method of BVV wire:
1. When installing cable terminals, the semiconductor electrical shielding layer must be stripped off, and the insulation must not be damaged during operation. Knife marks should be avoided. If necessary, sand it smoothly with sandpaper; the shielding end should be smooth, and the graphite layer should be smooth (carbon particles) removed.


2. The copper tape shield and steel armor at the end of the plastic insulated cable must be well grounded. This principle should also be followed when short-circuiting, so as to avoid induced electromotive force at the end of the steel armor during the three-phase unbalanced operation, and even “fire”, burnt-out of the sheath and other accidents. The ground lead needs to use our tinned braided copper wire. When connecting with the copper tape of the cable, ferrochrome should be welded. It is not recommended to use a blowtorch to seal and solder, so as not to burn the insulation layer.
3. The three-phase copper tape shield should be connected to the ground wire separately. Note that the shielded ground wire and the steel armored ground wire should be led out separately and insulated from each other. The position of the welding ground wire should be as low as possible.
The basic requirements of the cable end and the middle joint: a. Good conductor connection b. Reliable insulation, it is recommended to use radiation cross-linked heat-shrinkable silicone rubber insulation material. c. Good sealing performance d. Sufficient mechanical strength to adapt to various operating conditions.
The end of the cable must be protected from water and other corrosive substances to prevent the insulation layer from aging and breakdown due to water trees. A crane or forklift must be used for cable loading and unloading. Horizontal transportation and flat laying are prohibited. When installing large cables, the cable car must be used to prevent the cables from being damaged by external forces or being scratched by manual dragging.
If the cable cannot be laid in time for some reason, it should be stored in a dry place to prevent the end of the cable from being exposed to sunlight and water.

How much do you know about JHS cables

JHS is a waterproof cable with professional waterproof function. Professionally called copper core waterproof rubber flexible cable, we usually call it special waterproof rubber flexible cable for submersible pumps. It is mainly used for underwater electric power transmission. For example, we often use control cable for submersible pumps, underground coal mining wires and underwater lights, etc., which have good electrical insulation and good waterproofness.


The structure of JHS cable: Conductor: It is composed of multiple soft bare conductor or galvanized copper wires twisted together. Insulation: special waterproof and insulating soft rubber, or some waterproof silicone rubber materials are used. Filling: high-strength, mechanical-resistant jute rope or composite fiber rope or waterproof rubber. Wrap tape: Wrap a layer of ordinary water blocking tape on it, but if there is a metal shield, do not wrap the water blocking tape. Sheath: a special waterproof rubber is used, and the color is mostly black or white.


Conditions of use of JHS rubber sheathed cables: 1. Mainly used in power lines on submersibles with a rated voltage of 300/500V. 2. The commonly used cable cores include single core, double core, three core, four core, five core, 3+1 core, 3+2 core, and the commonly used cross-sectional area of ​​conductor is 1.5-300mm2. 3. Due to the use of cable Due to the particularity of the occasion, the maximum operating temperature of the cable during normal operation does not exceed 65°C.

Talk about the common misunderstandings of those wires and cables

Nowadays, there are many kinds of wires and cables, and their performances are diverse. When buying All Aluminum Alloy Cable

, many people choose to learn about the various parameters and evaluations of the cables on the network, but because the information on the network is too complicated, it is difficult to distinguish between true and false. , Some wrong viewpoints will cause misunderstandings to many people who browse and watch, so many misunderstandings about wires and cables are formed. Here is a summary of several common misunderstandings.

Misunderstanding 1: There is radiation in wires and cables

Many people have seen on the Internet that wires and cables have radiation. To be honest, there is radiation, but those who have a little knowledge of physics should know that everything that uses electricity has radiation. Even an electric fan has radiation. Except for those high-risk radiation products, the amount of radiation from ordinary wires and cables is negligible and basically negligible.

And what you may not know is that the radiation of wires and AAAC cables is even weaker than that of the mobile phones we carry around every day, so those who are afraid of radiation from wires and cables, the first thing to do is not to stay away from wires and cables, but Throw away the phone quickly.

There are also some people who worry about the magnetic field generated by wires and cables, and think that this kind of magnetic field has an unhealthy effect on the human body. If they are worried about the magnetic field, it is even more nonsense, because everyone knows that our earth has a natural geomagnetic field , And it has a larger range and stronger power. If the magnetic field is not good for the human body, the entire earth is no longer suitable for human habitation. Our Mars immigration plan can only be started in advance, so we are worried about the radiation magnetic field of wires and cables. I’m worried.

 

Smart grid boosts urban green development

In the future, smart cities will not only focus on high-efficiency and intelligent goals, but also include green, environmental protection and low-carbon development goals. The construction of smart grids will promote the green development of cities. With uneven energy distribution, a strong smart grid can greatly improve the grid’s ability to accept clean energy and optimize the allocation of energy resources on a large scale. More and more smart cities in our country are incorporating clean energy into the overall planning of smart cities. Especially abc cables played a huge role in this plan,realize the transformation of the economic development direction and the optimization and upgrading of the industrial structure. The goal is to build a modern and fully internationalized world ecological garden city, and the goal is to build a smart, green, and low-carbon livable city.


In the process of realizing the smart grid to promote urban green development, power cables play a prominent role in the construction of smart grids,the State Grid took the lead in practicing and established the National Wind and Solar Storage and Transmission Demonstration Project. The project is currently the world’s leading new energy comprehensive utilization platform integrating wind power, photovoltaic power generation, energy storage, and smart power transmission. Wind power will reach 1 million kilowatts, the total scale of photovoltaic installations will reach The scale reaches 110,000 kilowatts.


There are many participants in the construction of smart grids. With the construction of smart grids, its R&D and manufacturing levels will continue to improve, and the overall strength of the aaac industry will continue to improve. City-related industries will also develop rapidly and share market shares, creating conditions for smart grid-related industries to enter the international market. In addition, the improvement of the safe and stable operation of the power grid, the improvement of power supply reliability, and the high-quality power supply have also laid the foundation for the rapid growth of traditional industries and the rise of high-tech industries.

The important influence of aluminum alloy cables on wind power generation

The proposal of “carbon peak” and “carbon neutral” goals has accelerated the development of new wind and solar energy. In 2021, onshore wind power subsidies will be refunded, which will also intensify the demand for cost reduction of wind power, resulting in a rapid increase in the application of aluminum alloy cables. In addition, the introduction of new foreign technologies has promoted the rapid advancement of domestic wind power cost reduction programs.

The application of aluminum alloy cables in wind power has mature domestic cases, mainly in the fixed laying section of the tower. The introduction of new foreign technologies has further expanded the application of aluminum cables. The use of 8030 aluminum alloy conductors and the design of category 5 conductors make it possible to apply aluminum alloy cables in the torsion section.
By benchmarking the performance of foreign aaac conductors, the aluminum conductor adopts the same stranding process as the copper cable. Because the aluminum wire is lighter, the advantage of the aluminum cable is more obvious from the point of view of flexibility.

Reducing this cost saving is the eternal theme of the sustainable development of enterprises. The weight of the aluminum alloy conductor is reduced, and the load-bearing requirements of the sheath are simultaneously reduced, and the thickness of the sheath is also reduced in response, so the loss is smaller. Using aluminum alloy torsion cable design, the cable can be designed as a whole laying plan, which reduces the design of intermediate joints and can further reduce risks and costs.

Wind power has always been the main force in the development of new energy. How to ensure the long-term fast and efficient operation of wind turbines is the direction that wind power mainframe companies have been pursuing. Development of aluminum alloy cables has reduced the cost of wind turbine cables, reduced the risk of cable decline due to its own weight, and promoted the rational application of my country’s aluminum resources.

What are the selection methods of high-voltage cables

The ultimate principle for power supply lines in selecting cables is to ensure the safety of power supply, reduce costs to the utmost extent, and be reasonable in technical design.

The selection of AAAC conductor is mainly based on the following principles:

  1. Choose according to the duration and the maximum allowable load current. The selected cable will not generate heat after a long time of work, and the heat of the cable cannot exceed its allowable long-term temperature.
  2. Choose according to the voltage loss of the cable. The cable at the end that accepts the voltage has enough voltage, and the voltage loss must be small enough to ensure the quality of the power supply.
  3. Choose according to economic principles. The selected ABC  cable should be able to minimize the operating cost and achieve the purpose of economical power supply.
  4. Choose according to the mechanical strength of the cable. This is mainly to avoid cable damage or breakage due to insufficient strength during transportation or installation. Only when the strength meets the requirements can the safety of power supply be guaranteed.
  5. Choose according to whether the cable is stable enough when it is short-circuited. The cable must not exceed its short-circuit allowable temperature when it is short-circuited.

Environmental cables will become the global cable development trend?

In the new century, the importance of the ecological environment has become increasingly prominent, and environmental protection has gradually become the focus of attention and the mainstream of international development. Countries, organizations, companies and individuals all over the world are actively seeking environmental protection methods, and the laws and regulations that are compatible with them are becoming more complete and specific. Wires and cables are special commodities related to people’s life safety and the normal operation of almost all industries. In the face of people’s growing concern about the living environment and living environment, the market prospects of environmentally friendly cables are also increasingly promising, and gradually become the development trend of global power cables .The development potential cannot be underestimated.

Environmentally friendly cables refer to no heavy metals such as lead, cadmium, hexavalent chromium, mercury, etc., and no bromine-based flame retardants. They have been tested by SGS recognized testing organizations for environmental performance, and comply with the European Union Environmental Protection Directive (RoSH) and exceed its index requirements . It does not produce harmful halogen gas, does not produce corrosive gas, generates less fever when burned, and does not pollute the soil.

 

With the formulation of the European Union’s environmental protection directives, Europe, the United States, Japan and other countries have increasingly higher environmental protection requirements for the cables used. They have banned the use or import of non-environmental-friendly cables. The international market’s demand for environmentally-friendly cables is advancing with each passing day. With the maturity of environmentally-friendly cable production technology, the research and development and large-scale adoption of eco-friendly wires and cables has become an international trend.

Although the pace of China’s environmental protection cables lags behind foreign countries, it still conforms to the green trend and is constantly developing and improving the environmental protection cable market. The development and production of domestic environmental protection cables have also attracted attention from all parties. At the annual meeting of the national wire and cable industry, a green environmental protection — sustainable development strategy was formally proposed. It also clearly stipulates that “civil buildings with a height of more than 100 meters must use low-smoke, halogen-free, Class A flame-retardant wires and cables. High-rise buildings with a height of more than 100 meters and civil buildings less than 100 meters, such as a certain scale Hospitals, public entertainment venues, underground shopping malls, libraries, stations, supermarkets, terminal buildings, office buildings…, at least smoke-free, low-halogen and flame-retardant cables should be used.” One of the key projects of Zhejiang Province’s block industry standardization in 2012 ——The successful acceptance of the environmental protection wire and cable alliance standard marks a big step forward in the formulation of environmental protection standards in China.

It can be seen that the ecological environment-friendly cable market has a very broad prospect, which will undoubtedly bring new space and opportunities to the sustainable development of the wire and cable industry.

In many places in key projects, low-smoke and halogen-free wires and cables are used in places such as fire fighting, monitoring, and alarms. People usually call them environmentally friendly cables. In fact, environmentally friendly cables do not refer to low-smoke, halogen-free wires and cables. It is a cable produced in accordance with the Japanese FN cable manufacturing standard.

With the global promotion and spread of the concept of green environmental protection, the concept of environmental protection is gradually permeating all walks of life, and with the gradual use of environmentally friendly products and gaining popularity, the wire and cable industry has also begun to attach importance to the development and promotion of environmentally friendly cables. Our country also attaches great importance to this field, and relevant laws and regulations expressly require that in the construction of major projects, the use of non-environmental protection cables is strictly prohibited.

So what is an environmentally friendly cable, and what are its characteristics?

1. High flame Retardancy: The environmental protection cable can fully guarantee its high building requirements for fire protection. In the event of a fire, the environmental protection cable can not only be difficult to burn, but also prevent the spread of flames and the expansion of disasters after burning.

2. Halogen-free: The use of green environmental protection insulation layer, sheath an special oxygen barrier materials not only make the environmental protection cable have good electrical and physical and mechanical properties, but also ensure that the product is halogen-free and solve the problem of burning “Secondary pollution” avoids carcinogenic “dioxin” substances produced when traditional PVC cables burn.

3.metals harmful to the human body. When the environmental protection cable is used and disposed of, it will not pollute the soil and water sources. And after harsh toxicity experiments, the white rats were safe and sound under the specified experimental conditions.3. Low toxin: The insulation and sheath of cable do not contain lead, cadmium and other heavy

4. No corrosive gas: new special coating materials that do not pollute the environment are used, so that environmentally friendly cables will not produce toxic gases such as HCL during production, use and combustion, and emit very little acid gas, which is harmful to personnel, equipment and instruments. Less damage and more environmentally friendly features.

5. High light transmittance: The smoke produced when the environmental protection cable burns is extremely thin, which is conducive to the evacuation of personnel and the conduct of firefighting. Generally speaking, the light transmittance of environmentally friendly cable products is greater than 40%, which is far higher than the standard of less than 20% for traditional flame-retardant cables and cables.

6. High protection against ultraviolet rays or water: This performance can make the environmental protection cable less likely to be weathered during use, slow down the aging speed of the environmental protection cable to a certain extent, and extend its service life.

In general, environmentally friendly cables are a major trend. In recent years, the sales share of environmentally friendly cable products has increased dramatically. Because environmentally friendly cables have the characteristics of non-toxic and non-polluting to people and the environment, high safety and reliability, and long service life, they are expected to become the mainstream of the future cable market.

Cable selection method of generic cabling system

Generic cabling is one of the key links of information network system. In order to ensure the high-speed and stable operation of information network system, it is particularly important to select high-quality and high-performance cables.

The cable selection should be based on the system requirements, technical performance, investment estimates and other factors, but in the wiring system, it should first determine the type of cable used and the structure of wiring (unshielded cable, shielded cable, optical cable or mixed use). Cables usually use Aluminum conductors with insulation and one or more layers of plastic sheath. The cable usually consists of 2 to 3600 pairs. Large logarithmic cables are usually used in backbone cabling systems and are suitable for voice and low rate data transmission. The maximum lengths of these cables for trunk and horizontal (hub to desktop) cabling systems are specified in the latest GB 50311-2007. It should be noted that these maximum length limits apply to all media. They do not consider the impact of performance differences due to different cable types and protocol types used in the network. In fact, the maximum cable length will depend on the application of the system, the type of network and the quality of the cable.

Method of cable selection in generic cabling system

Since it is a building, it will definitely use a lot of communication cables. As the nervous system of intelligent building, generic cabling system is the key part and infrastructure of intelligent building. It has a very close relationship with the planning and design, construction, installation and maintenance of construction engineering. It is like an information superhighway in the building. People can communicate and communicate conveniently, quickly and effectively. It can be said that the generic cabling system connects the communication, computer and various facilities and equipment in the intelligent building to form a complete set of whole, so as to meet the requirements of highly intelligent.

But then we have to consider a problem: fire prevention. Once a fire breaks out in the building, the heat and gas released by these cables will become a major safety hazard. Looking at several large-scale fire accidents in China in recent years, many of them are due to the fact that the victims can’t escape. The burning of cables emits poisonous acid gas. In addition, a lot of heat and smoke are released from the combustion, which makes it difficult for the victims to breathe and lead to tragedies. Therefore, in addition to considering the performance, fire protection and environmental protection are also very important reference factors when we select cables for generic cabling system.

Discussion on environmental protection requirements of PVC cables and wires

The use of non environmental protection cables is strictly prohibited in developed countries, and China also attaches great importance to this field. China’s relevant laws and regulations clearly require the use of PVC wires and cables in important buildings. Halogen free and low smoke crosslinked PVC wires and cables must be used to avoid heavy smoke and chlorine gas causing casualties in case of fire.

Environmental protection cable will effectively drive the development of cable industry, enhance the competitiveness of cable manufacturer, and make the cable industry more and more stable on the road of sustainable development in green practice and innovation. In recent years, China’s cable enterprises have gradually made efforts to environmental protection cables and low smoke and halogen-free cables. As far as possible, they do not contain heavy metals such as lead, cadmium, mercury, bromine flame retardants, harmful halogen gases, corrosive gases, less heat during combustion, and no soil pollution. Environmental protection cables will be more favored by the market, and will be recruited by power grid companies It is easier to get high order in the bid.

The user’s requirements for environment-friendly wires and cables can be summarized as follows:

1. Low content of lead and heavy metals is required

It is well known that lead and some heavy metals will have adverse effects on human health. In PVC formulation, additives such as lead, cadmium, barium and other heavy metal compounds are usually needed. However, since the 1990s, some developed countries and large electric companies have successively formulated laws and regulations. In the PVC wires and cables used, there are eight kinds of heavy metal content shall not be greater than the regulations. These new regulations not only bring new business opportunities to wire and cable manufacturers, but also bring serious challenges to PVC cable manufacturer.

2. Low smoke and low hydrogen oxide are required

Good flame retardant performance is a very obvious advantage of PVC wire and cable. However, when ordinary flame retardant PVC cable is on fire, it will release thick black smoke and a large amount of HCI gas, which will cause “secondary disaster” after the fire, and seriously affect personnel evacuation and fire rescue work. Therefore, in addition to the flame retardant requirements for wires and cables, the requirements of “low smoke” and “low HCI” will be put forward in some applications.

3. Low toxicity or non toxicity is required

In addition to lead-free and heavy metal free, non-toxic (or low-toxic) cables are required for some household appliances, medical and health appliances and children’s electric toys that may come into contact with food and blood products. This means that all constituent materials used in PVC formulations should be non-toxic. There are a lot of plasticizers in cable materials, but the non-toxic plasticizers must be used to manufacture non-toxic materials. Therefore, the requirements of this PVC material are higher than that of lead-free and heavy metal free materials, and the price is naturally more expensive.

4. Other prohibited items

At present, the regulations being reviewed by the EU impose restrictions on the following items to ensure that wires and cables meet the requirements of environmental protection. For example: 1) asbestos; 2) biphenyl and its ethers, polybrominated phenol; 3) polychlorinated biphenyls; 4) short chain (C10-C13) chlorinated paraffin.

With more and more attention to environmental issues, many countries have formulated a variety of environmental protection policies, so people prefer to use green cable. Low smoke halogen-free flame retardant cable material is one of the most popular environmental protection cables. Although China’s market demand for green cable is growing, compared with developed countries, China still has a long way to go in terms of relevant policy formulation and mandatory application. China should improve the environmental protection cable standards as soon as possible.