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.

Five aspects of high temperature wire and cable exit

At present, many domestic high-temperature wire and cable enterprises have entered the foreign market, but compared with foreign domestic products, the competitiveness of China’s high-temperature wire and cable products needs to be improved, especially some enterprises act rashly without understanding the foreign industry standards, which leads to an embarrassing situation for the development of enterprises. As a well-known brand in the high-temperature wire and cable industry, Chuncao has made certain achievements in the foreign market. Here are five aspects to be noted in the export of high-temperature wire and cable.

1、 Technical standards: advanced standards such as IEC or British standard, American Standard and other advanced standards are generally required for foreign high-temperature wires and cables. Therefore, it is not enough to be familiar with domestic standards, but also familiar with international standards.

2、 Laying conditions: the environmental conditions in West Asia, Southeast Asia and other regions are relatively special, such as the extreme maximum temperature of 50 ℃ and the maximum daily average temperature of 40 ℃. Therefore, the description of technical parameters related to the environment (such as the correction coefficient of current carrying capacity) should be paid attention to in the technical data.

3、 High temperature wire and cable structure: due to the high temperature wire and cable laying environment, the high temperature wire structure should not only meet the standard requirements, but also have some additional requirements. Therefore, enterprises should pay attention to it in the design and manufacturing process of high-temperature wires and cables.

4、 Packaging of high-temperature wire and cable: for export high-temperature wire and cable, the delivery tray generally adopts large plate or steel plate structure, and is fully enclosed with sheet iron or wood. In addition to the length and minimum allowable bending radius of the high temperature line, the size of the container should also be considered. Strictly follow the order requirements. As the packaging of export high-temperature line is more complicated than that in China, it will affect the cost and delivery time of high-temperature line. Therefore, attention should be paid when signing the contract.

5、 Other precautions: before delivery, the main technical parameters, sectional drawings, laying instructions and other data of high-temperature wires and cables shall be provided to users, and the test reports shall also be delivered with the goods. The technical data shall be complete; the manufacturing length of high-temperature wires and cables shall be strictly controlled, and the error of delivery length shall be minimized. All export products must pass the inspection of the State commodity inspection department and issue the commodity inspection certificate.

With the accelerated process of world economic integration, the market competition of domestic high-temperature wire and cable enterprises will not be limited to the domestic market, and the foreign market is the greater stage. It is hoped that domestic enterprises can carefully consider the above five points before entering the foreign market, and make the most suitable development plan according to their own conditions.

Cable requirements for wind power applications

Generally speaking, wind fields are located in harsh environments with special climatic conditions, such as strong winds, strong ultraviolet rays, and air with high salinity. For this reason, the cable performance in wind power applications is undoubtedly higher than that in other applications. The moving parts in the fan further increase the importance of choosing the right cable.
The maintenance of existing wind farms and the development of new large-scale wind farms need to consider the use of high-grade power cables, data and control cables and communication cables, which determine the interconnection quality of power grids and communication systems. More cables are needed for a single wind turbine than people think. For example, a 1.25MW 90m wind turbine requires about 1km of power cable. In this way, the wind field of 50MW installed capacity will need 40km of cables.


(1) wires
To maximize flexibility, it is recommended that the design engineer use only multiple strands of annealed soft copper wire. The short concentric strand structure is used in bending applications. In torsional winding applications, long concentric strand structures are used. Conductors with an area of more than 6mm2(10AWG) are required to use a composite stranded structure.
(2) the insulation
To increase low temperature flexibility, thermoplastic rubber (TPE), ethylene propylene rubber (EPR, an EPM or EPDM) or silicone rubber (SiR) are usually selected as insulating materials to resist ozone corrosion and heat-induced aging. PVC/ nylon insulation is also widely used due to its high dielectric strength.
(3) the sheath
The cable sheath can be a thermosetting compound such as polyvinyl chloride (CPE), polychloroprene (chloroprene rubber), chlorosulfonated polyethylene (CSPE) synthetic rubber; Similar thermoplastic compounds such as TPE, TPE-PVC alloys, and polyurethane. These materials are resistant to oil, fuel, solvent corrosion, and excellent flexibility at low temperatures. This characteristic makes it an ideal sheath material for wind power cables.
It should be noted that cable structure is also a decisive factor in cable flexibility. Symmetrical conductor designs with balanced structures are usually highly flexible.
Even if these general rules are followed when cables are manufactured, it is highly recommended that a complete test be performed to simulate a “real” application.

Mineral insulated cable

BTTZ mineral insulated cable
1.BTTZ cable structure
Its structure is: 1. Solid conductor;  2. Magnesium oxide mineral insulation; 3. Copper sheath.
2. Performance characteristics of BTTZ cable
The advantages of BTTZ cable are: it is a non-combustible cable with excellent waterproof performance and radial waterproof and moisture-proof function.
The disadvantage of BTTZ cable is: (1) first of all it is not suitable for moving occasions, copper pipe once damaged insulation performance will rapidly decline, and the insulation performance under high temperature will rapidly decline, so the project should not be used in large quantities; (2) Secondly, this cable due to magnesium oxide insulation is easy to absorb moisture, cable longitudinal moisture-proof requirements and from metal sheath damage is particularly important, end sealant, will seriously affect the service life; (3) In addition to the manufacturing process also limited the cable manufacturing length, resulting in increased joint, joint waterproof treatment is also very difficult, often because of the joint water, resulting in unqualified insulation resistance.

YTTW mineral insulated cable

1.YTTW cable structure
(1)Copper conductor. (2)High temperature (1375℃) will not burn the inorganic (mineral) insulation with insulation. (3)Outer copper sleeve.
2.YTTW cable performance characteristics
Advantages: metallic sheathed inorganic mineral insulated cable. Is a flexible fire cable.

1. Fire resistance
Copper and magnesium oxide, two materials used in mineral insulated cables, are inorganic. This cable does not burn or assist combustion and can continue to operate under conditions close to the flame. The copper sheath melts at 1083 ° C, while the magnesium oxide insulation solidifies at 2800 ° C.
2. High operating temperature
Mineral insulated cables can withstand continuous operating temperatures up to 250℃. However, in an emergency, the cable can continue to operate for a short period of time at temperatures close to the melting point of the copper sheath.
3. Long life
The inorganic materials used in mineral insulated cables can ensure the cables have stability, long service life and fire resistance.

Shortage: YTTW cable, first of all, its sheath USES copper sheath, with copper increased production costs. The cable with a larger section is still hard and not flexible enough, so the larger section (greater than 630mm2) cannot be produced and cannot meet the requirements of large current of the system.

Comparison of YTTW cable and BTTZ cable performance
1. YTTW– Flexible fire cable;
BTTZ– Rigid fireproof cable.
2. YTTW– Unlimited cable manufacturing length;
BTTZ– Cable is limited by manufacturing process, conductor section is small, manufacturing length is short.
3. YTTW– Meet the requirements of design and construction acceptance specifications;
BTTZ– It is mandatory to meet the requirements of “No joints in the middle of cable Lines” in Cable Design Code for Power Engineering, “Avoid intermediate joints” and “Reduce cable joints” in Electrical Design Code for Civil Buildings and “Code for Construction and Acceptance of Cable Lines in Electrical Installation Engineering”.

Damp damage to cables

Although the summer heat, but the rain is also very much, especially in the rainy season, is wet, there are a lot of products because of the improper storage, all be affected with damp be affected with damp, the late is certainly will affect the use, wire and cable, not to mention was electricity is not able to touch water, if be affected with damp be affected with damp the use will not only influence, will certainly bring us some harm, so let’s to find out what are the dangers of cable to be affected with damp be affected with damp.


1. When the new whole cable leaves the factory, both ends of it are sealed with plastic sealing sleeve. However, after it is used for a period at the construction site according to the actual situation, the rest part is simply wrapped with plastic cloth for the fracture.
2.During cable laying, it is often necessary to cross roads, Bridges and culverts, etc. Due to weather or other reasons, a lot of water is often accumulated in the cable trench. During the laying process, it is inevitable that the cable end will be immersed in water, and water will enter the cable due to the loose wrapping or damage of the plastic cloth; In addition, sometimes the outer sheath and even the steel armor will be scratched during the traction and tube penetration. This phenomenon is particularly prominent when mechanical traction is used.
3. After the completion of cable laying, due to the limitation of on-site construction conditions, the cable ends that have not been sealed are exposed to the air for a long time, or even immersed in water, so that a large amount of water vapor enters into the cable.
4.During the production of cable ends (including terminal ends and intermediate joints), due to the negligence of the construction personnel, the newly treated cable ends sometimes accidentally fall into the water on the site.
5. During the normal operation of the cable, if breakdown occurs for some reason, the water in the cable trench will enter the cable interior along the fault point; In civil construction, especially in the use of large construction machinery construction sites, due to a variety of human factors caused by cable damage or breakdown accident, also common. When such an accident occurs, the insulation of the cable is severely damaged, which can also cause water to the cable.