The reason why cable manufacturing cannot do without plastic

1. Melt index

Under a certain temperature and pressure, the number of grams of molten resin extruded from a certain hole in 10 minutes is called the melt index, expressed in MI, and the unit is g/min.

2. Cold resistance

The ability of plastics to buy AAAC conductor maintain certain physical and mechanical properties at low temperatures is called the cold resistance of plastics. It is often expressed by the following cold-resistant temperature.

1) Low temperature embrittlement temperature: it is the temperature at which 50% of the ACSR conductor full form samples are damaged when the plastic is subjected to a specific impact load at a low temperature.

2) Low temperature half-folding temperature: it is the temperature at which the plastic sample is about to rupture when it is bent 180o.

3) Low-temperature impact compression temperature: it is the temperature at which the plastic sample is impacted and compressed by a hammer with a certain energy and speed at a low temperature to make the rupture rate reach 50%.

11. Flame resistance

Flame resistance refers to the ability of plastics to resist flame burning. Generally, plastics will burn after contacting the flame. After the flame is removed, the flame extension varies with different types of plastics, so the flame resistance performance is also different.

3. Heat aging performance

In the process of plastic processing and use, the performance of the plastic deteriorates due to heat. This phenomenon is called thermal aging. The ability of plastics to resist heat aging is called heat aging resistance. Use accelerated thermal aging test at high temperature to determine the retention rate of plastic properties (mechanical properties or electrical properties) after aging to measure the heat aging resistance of plastics.


4. Weather resistance

Plastics are used under atmospheric conditions and are affected by harsh natural conditions such as sunlight, rain, wind, and air pollution. The deterioration of plastic performance is called atmospheric aging. The ability of plastics to resist atmospheric aging is called the weather resistance of plastics.

5. Oil resistance and solvent resistance

When plastic comes into contact with mineral oil or various solvents, its ability to resist oil or solvent is called the oil resistance or solvent resistance of the plastic. The sample can be immersed in oil or solvent, and after a certain time at a certain temperature, the absorption rate, volume change rate or tensile strength and elongation retention rate of the oil or solvent can be measured.

6. Water resistance and humidity resistance

The ability of plastics to resist the penetration of water or humid gas under water or humid conditions is called the water resistance or moisture resistance of plastics. After the plastic absorbs water or moisture, it will cause a decrease in insulation resistance, breakdown field strength, increase in dielectric loss, and changes in the appearance, weight, and mechanical properties of the plastic. Therefore, plastics are required to have good water resistance and moisture resistance. For plastics used in wires and cables, the main consideration is to ensure that the electrical insulation properties of the plastics meet the requirements of use after immersion or moisture absorption. The water absorption of plastic can be expressed by the water absorption per unit area, the water absorption rate or the water absorption weight. The moisture permeability of plastics is expressed in terms of moisture permeability coefficient and vapor permeability.

Five Well-known Cable Brands in China

1. TBEA 
TBEA Co., Ltd. (TBEA Co., Ltd.) referred to as “TBEA” (A stock code: 600089) is a service provider that provides system solutions for the global energy industry and is a large local industrial manufacturing in Xinjiang The enterprise is a large-scale energy equipment manufacturing enterprise in China. It is composed of nearly 20,000 employees from 29 ethnic groups including Uyghur, Han, Kazakh, Hui, Mongolian, and Tajikistan in 24 countries around the world. my country’s large-scale aluminum electronics, polysilicon new material development and export base, a large-scale solar photovoltaic system integrator, has 14 domestic manufacturing industrial parks, and two overseas bases.

2. Zhongtian Technology
Zhongtian Technology started in 1992 and started with optical fiber communications. With the rapid development of the national information industry, it has now formed a two-wheeled industrial scale driven by telecommunications and power grids, and is involved in the field of new energy. It has successively been awarded gold medal listed company, national innovative pilot enterprise, and ranked among the top 100 Chinese electronic information and top 500 private enterprises in China.
The layout is Beijing headquarters, Nantong new department, Rudong headquarters. The company adheres to the “going global” strategy, exports its products to more than 100 countries and regions, opens factories in India and Brazil, and has more than 40 overseas offices to gradually build ZTT into a world-class Chinese optoelectronic cable brand.

3. Henan Huaxing Cable
Henan Huaxing Wires& Cables Co. was established in 1984 and is a specialized and large-scale cable manufacturer. The company is mainly committed to the system research and development, design, manufacturing, marketing and service of four major types of cable products such as overhead wires, power cables, electrical equipment wires and cables, and household cables. Products are widely used in power transmission, transportation, energy, petrochemical and other industries as well as urban construction and other fields. They are sold all over the world and are deeply trusted by users.
The company adheres to the quality policy of “innovative work, technological refinement, quality, and trust”. In recent years, it has successively introduced more than dozens of advanced technologies and equipment from Finland, Switzerland, the United States, Japan, Germany and other countries. An assembly line operation has been formed, and the production equipment has basically reached the domestic first-class level. The company has complete inspection, measurement and testing institutions and advanced equipment, which provide a fundamental guarantee for high-quality products. Pursue and produce high-quality products consistently.

4. Baosheng Cable
Baosheng Group Co., Ltd., a subsidiary of Aviation Industry Corporation of China, was established in 1985. Its R&D and marketing centers are located in Jinshan District and Putuo District, Shanghai, and its production centers are located in Yangzhou City and Baoying County, Jiangsu. It is a relatively competitive power and intelligent industry group in China that integrates wires and cables and systems, cable materials, electrical appliances, high, middle and low voltage inverters, servo systems, industrial robots and logistics services, as well as the construction and operation of photovoltaic power stations. Baosheng Group is a provider of power projects such as power station construction, power engineering, power facilities, and information technology and intelligent system engineering solutions. It can provide from engineering design to cable and electrical product design, manufacturing, installation, photovoltaic power generation, and construction. A complete set of systematic and integrated services such as steel structure and general engineering contracting

5. Delixi Electric
Delixi Electric Co., Ltd. was established on January 4, 2007, located in Liushi Town, Yueqing City, Zhejiang Province, with a cumulative investment of nearly 2 billion yuan, covering an area of ​​600,000 square meters, and employing more than 10,000 employees. It is a large-scale joint venture in China’s low-voltage electrical industry.
Through 30 years of unremitting efforts of two generations of Delixi people, the “Delixi” brand has become a household name in China.

Why is the cable hot?

In recent years, various types of electrical appliances often catch fire in our daily lives. Therefore, when using electrical appliances, the cables need to be protected. However, I don’t know if you find that the cable will heat up during operation. Is it a manifestation ofAerial Bundled Cable (ABC) HD 626 S1 Standardquality problems? Or is it a normal phenomenon of cable use? What is the cause of the cable heating during operation? How should we deal with the heating of cables?
If the cable becomes hot during operation, this does not mean that there is a problem with the cable quality, but the normal operation of the cable. As long as the cable passes a certain load current, it will definitely heat up, and as the load current increases, the surface temperature of the cable will be higher. Therefore, it is basically normal to control the surface temperature of the wire below 60 degrees.

The reasons for the cable heating during operation are as follows:
1. The cable conductor resistance does not meet the requirements, causing the cable to generate heat during operation.
2. Inappropriate cable selection, for example: the conductor cross section of the cable is too small, and overload occurs during operation. The heat dissipation and heat dissipation of the cable are unbalanced after long-term use, causing the cable to heat up.
3. When the cables are installed too densely, the ventilation and heat dissipation effect is not good. OrAerial Bundled Cable (ABC) SANS 1418 Standard is too close to other heat sources, which will affect the normal heat dissipation of the cable, and may also cause the cable to heat up.
4. The manufacturing process of the cable joint is not good and the crimping is not tight. If the contact resistance at the joint is too large, it will also cause the cable to heat up.

5. The insulation performance between the phases of the cable is not good, which leads to low insulation resistance and heat generation during operation.
6. Part of the sheath of the armored cable is damaged. After the water enters, it will slowly damage the insulation performance. As a result, the insulation resistance will gradually decrease, and it will also cause heat during the operation of the cable.
After the cable heats up, if the cause is not found, the fault should be eliminated in time, and the continuous power operation will continue. The insulation thermal breakdown phenomenon will occur, causing the cable to short circuit and trip between the phases, which may cause a serious fire.
So, how to deal with the heating of the cable? Since the cable heats up when there is current passing through it, we cannot cool the cable in cold water because this will cause water to enter the cable and affect the use of the cable. Therefore, when using the cable, we can only pay attention to the use time of the cable and distribute the power reasonably. The cables should be checked regularly to see if they are old or damaged. If this is the case, the cable should be replaced in time to avoid causing the cable to catch fire.

The difference between an open wire and a dark wire

Hydropower renovation is carried out before interior decoration, which is also a key link in the entire renovation process. If there is an error, it will bring a lot of trouble to the future decoration work. Time is wasted and money is wasted, so the early hydropower transformation is more important and attract enough attention. Many people are struggling with a problem now. Is it better to install an open wire or a hidden wire? Let us find out.
1. Advantages of installing hidden wires:
1. Security
Our first consideration is safety. If PVC XLPE Insulated Power Cable 25mm² ~ 400mm² are exposed, the chance of direct contact with the human body after an accident will increase, and the damage rate will be higher.
2. Beautiful
The dark lines make them invisible from the outside, so that the surface looks more beautiful and will not affect the overall design of the room.
3. Life
The main reason is to hide the wires on walls that are prone to aging. The surface air circulation of the bare wire is relatively fast, and the continuous change of temperature increases the aging speed of the circuit.
Disadvantages of installing hidden wires:
The main reason is that the construction is more difficult and troublesome, so there are three problems: one is that the construction period needs to be extended, the other is the increase in construction cost, and the third is that the technical requirements are high and ordinary people cannot be hired. However, some people say that the installation of grooves will affect the building, but I think that in accordance with the construction rules, control the depth of the grooves and do not open holes at will, basically there will be no problems.

2. So which of the two costs money?
Perhaps most people think that installing hidden wires is troublesome, and the cost will naturally be high; but what is unexpected is the cost of installing wires, mainly the construction cost; but installing open wires is the cost of building materials; installing open wires requires the use of BVVB or RVV The cost of this kind of wire is much higher than that of BV wire and BVR wire.
What is the voltage, DC or AC… 90% of the people are immediately dumbfounded…

3. Construction skills
1. When power distribution wires, there should be no knots or kinks in the pipeline. When connecting PVC pipes, joints are required, and glue must be used to bond them firmly.
2. Distribution lines include strong current lines and weak current lines: network lines, telephone lines, air-conditioning lines, TV lines, lighting lines, etc. should be placed with bushings.
3. We all prohibit burying wires directly in the plaster layer.
For the construction of the above-mentioned lines, you need to pay attention to skills and methods, and pay attention to the wiring method. The installation of wires will have a major impact on our future lives.
The above mainly introduces whether the wires are installed with open wires or hidden wires. I believe that through reading the above, everyone has a better understanding of the installation of aaac conductors. Thank you for reading.

Selection of power cables for home use

The decoration of the new house has many small and large details, and every detail needs to be taken seriously. This is because many decorative details are related to the comfort and safety of the house. However, there are many decorative materials on the market. Therefore, many friends do not know how to choose when choosing materials. Among them, everyone is more entangled. The question of material selection is: Should power cables be flexible wire? Or should I choose a hard line! What is the difference between hard wire and soft wire? Below, I will give you a brief explanation.
Before choosing hard wire or soft wire, we must first know what is hard wire? What kind of wire is a flexible wire?
The so-called flexible wire refers to strands of conductive solid wires with a diameter less than 1mm twisted together, that is, multiple strands of copper wires are twisted together. Therefore, the flexible cord is also called “sheathed cord”. Hard wire refers to a hard wire composed of several thick copper cores. Generally, hard wires of less than 10 square meters are single stranded.

So, what are the advantages and disadvantages of soft and hard wires? The details are as follows.
From the point of view of the service life of the wire, because the hard wire is thicker, it is not easy to oxidize; the flexible wire is composed of multiple thin copper wires, which are easily oxidized by the air, so the service life of the hard wire is much longer than that of the flexible wire From the perspective of the cost of the wire, since the flexible wire is relatively soft, it must be wound many times before use; the hard wire has only one copper wire, which can be passed directly. Therefore, compared with flexible wires, hard aaac conducors have less processing and are much cheaper; from the perspective of current-carrying capacity, flexible wires are composed of multiple strands of copper wire, and their current-carrying capacity is greater than that of a single copper wire. , But when it is suddenly loaded, the capacity of the current-carrying hard wire is greater than the capacity of the flexible wire; therefore, if it is used in general household appliances and the current does not exceed 100 A, single-stranded wire can be used.

2. From the perspective of the working process of the wire, use a soft wire at the connection of the hot tin or iron wire end, otherwise the multi-stranded wire may rise and connect with the next wire, which is very dangerous; and the hardness of the hard wire Very strong, its safety performance is relatively strong, from the perspective of whether it is convenient to repair the wire; although the hard wire is more difficult to replace, it can be completely pulled out of the threaded tube; if necessary, you can also replace the threading; but The cord is different, because the cord is prone to aging and breaks easily, so when the cord is replaced, the wire is likely to be damaged.
Generally, hard wires are more suitable for household use. However, it is worth noting that not all household wires need to use hard wires, and some places are more suitable for flexible wires. Therefore, when choosing wires, you should choose according to the location of the wires and the needs of your own home.

Model of mobile rubber sheathed flexible cable

Mine cable is a general term for flame retardant cables for coal mines

Working voltage of mobile flexible cables for coal mines:

The rated current is indicated by U0/U, and the enterprise is kV. U0 indicates the effective value of the voltage between any main insulated conductor and the “ground” (metal material shielded, metal material sheath or surrounding material); U is the middle of a multi-core cable or a single-core cable system software. The effective value of the voltage.

In an AC system, the rated voltage of the cable should be at least equal to the nominal voltage of the system to which the cable is applied. This standard is applicable to both U0 and U values.

Shenyang coal mine mobile rubber sheathed flexible cable

Naming standards for mobile flexible cables:

The name of the mobile flexible cable is composed of seven parts: among them: the first, second, third, fourth, and fifth parts constitute the model specifications of the cable; the sixth, seventh, and eighth parts The specifications and models that make up the cable.

The first part: use English capital letter M to indicate the serial product number of cables for coal mines.

The second part: application application feature number, reflecting the place where the cable is applied,

C: For coal mining machine, D, for ultra-low temperature natural environment, M: for cap lamp, Y: for coal mining machinery and equipment (mobile), Z: for electric drill.

The third part: the characteristic number of the cable, B: manual braided lifting; J monitoring or auxiliary copper core cable; P: non-metallic material shielded; PT: metal material shielded; Q: light-shaped; R: wrapping and lifting.

The fourth part is the characteristic number of the raw material. Use E to indicate that the insulation layer or the sheath is made of polyurethane elastomer. This part is omitted when vulcanized rubber is used for both the insulating layer and the wire sheath. E, polyurethane elastomer raw materials

The fifth part: Indicate the rated current U0/U, the enterprise is KV (kV).

Part 6: Indicate the number of cores of the driving force * tolerance cross section, and the two are connected by “×”. Tolerance cross-section enterprise is square millimeter (mm2)

Part 7: Indicate the number of grounding wire cores*tolerable cross-section, and the two are connected by “×”. The tolerance cross-section enterprise is square millimeter (mm2).

The eighth part: Indicate the number of bisector cores*tolerable cross section, with “×” between them

Join. The tolerance cross-section enterprise is cubic millimeter (mm2).

The fourth part and the fifth part are connected by “-”; the sixth part, the seventh part, and the eighth part are connected by a “+”.

Mobile flexible cable core specifications: 1, 1.5, 2.5, 4, 6, 10, 16, 25, 35, 50, 70, 95, 120, 150, 185, 240, 300, 400,

MYPTJ — — -Mining mobile shielded metal material monitoring rubber sheathed flexible cable

MYP — — — -Mining mobile shielded rubber sheathed cable (0.66/1.14)

MCP — — — — Special cable for mining shearer (shearer shielded rubber sheathed flexible cable)

MYJV22 — — — -Mining polyethylene insulation layer HDPE sheathed double steel chain armored cable

Shenyang coal mine mobile rubber sheathed flexible cable

The use of ACSR conductor 


Rubber sheathed cables are widely used in various electrical equipment, such as portable power cords for household appliances, electrical machinery, electrical equipment and appliances, and can be used in indoor or outdoor environmental conditions. According to the mechanical external force of the cable, the product structure is divided into three types: light, medium and heavy, and there is also an appropriate connection in the section. Generally, light-duty rubber-sheathed cables are used in household electrical appliances and small electric equipment, requiring softness, lightness, and good bending performance. In addition to industrial use, medium-duty rubber-sheathed cables are widely used in agricultural electrification, and heavy-duty cables are used in port machinery, searchlights, Large-scale hydraulic irrigation and drainage stations in the family business. This type of product has good versatility, complete series specifications, good performance and stability.

Waterproof rubber sheathed cables and AAC conductor for submersible pumps are mainly used for submersible motors. The model is JHS, JHSB.

For cables for radio devices, currently two types of acsr conductor (one shielded and one unshielded) are mainly produced, which can basically meet the requirements. The model is WYHD, WYHDP.

Photographic cable products, in line with the development of new light sources, have a small structure and good performance, while meeting the needs of indoor and outdoor work, and gradually replace some old products with heavy weight and poor heat resistance.

Rubber cable model

Rubber sheathed cables are divided into heavy rubber sheathed flexible cables (YC cables, YCW cables), medium-sized rubber sheathed flexible cables (YZ cables, YZW cables), light rubber sheathed flexible cables (YQ cables, YQW cables), and waterproof rubber sheathed flexible cables ( JHS cable, JHSB cable), welding machine cable (YH cable, YHF cable) and YHD cable are tin-plated power cables for field use.

Analysis of commonly used PVC materials for wire and cable sheath

Commonly used plastics for wires and cables include polyethylene, cross-linked polyethylene, polyvinyl chloride, polypropylene, polyolefin, fluoroplastics, nylon, etc.
Polyethylene is currently the most widely used plastic with the largest consumption. From the data in the table, it can be seen that polyethylene has low meson loss, high resistivity, high breakdown field strength, good weather resistance and manufacturability. It is currently the best electrical Insulation Materials. However, due to its low operating temperature, it is mainly used as insulation for communication cables. Medium-density and high-density polyethylene have high strength and hardness, and their water permeability is low, and they are mostly used as cable sheaths. However, polyethylene has the biggest disadvantage, that is, it is easy to burn and has strong black smoke, so its application brings many hidden dangers to the environment.
Cross-linked polyethylene is an excellent thermosetting insulating material formed by adding a cross-linking agent to low-density polyethylene. On the basis of inheriting many excellent properties of polyethylene, it has improved mechanical properties, weather resistance and allowable working temperature, thus becoming the best insulation material for power cables.
Due to the different crosslinking agents added, different crosslinking processes are formed. At present, there are three kinds of chemical crosslinking, warm water crosslinking, and radiation crosslinking that are most used. Chemical crosslinking is mainly used for medium and high voltage cables (such as 10KV and above); warm water crosslinking and radiation crosslinking are mainly used for low voltage cables (1kV and below).
The insulation conductor performance of cross-linked polyethylene is closely related to its purity. The insulation of high-voltage and ultra-high voltage cables above 35KV must be made of ultra-clean cross-linked polyethylene, which not only requires high purity of raw materials, but also requires high cleanliness of cross-linking process equipment and environment, and the process is stable and reliable.
It should be particularly pointed out that the insulation properties of polyethylene and cross-linked polyethylene have a “quirk”, that is, they are suitable for AC insulation, not DC insulation, especially DC high voltage will reduce their insulation life. Therefore, the insulation of DC cables is mostly rubber insulation or oil-paper insulation. Furthermore, polyethylene and cross-linked polyethylene insulation have “waterphobia”, and their breakdown is often related to the presence of water, that is, “water branches” are formed under high voltage, leading to insulation damage. Therefore, when polyethylene and cross-linked polyethylene are used for the insulation of high-voltage and ultra-high-voltage cables, they are particularly “water-proof” during their processing, storage and transportation, and insulation extrusion, and there should be a water-blocking structure outside the cable insulation shield, such as metal jacket.
Compared with polyethylene, polyvinyl chloride and paper insulation, one of the biggest advantages of cross-linked polyethylene insulation is that the working temperature is increased by 20°C, which improves the safety of the cable and reduces the input cost of the cable. For example, when the line flow is the same (such as 300A), the cross-sectional area of ​​the copper conductor of the polyethylene or PVC insulated cable (such as the YV type or VV type) needs 120mm2, while the cross-linked polyethylene insulation tape male basketball copper conductor cross-sectional area only needs 70mm2 is sufficient. It can be seen how remarkable the advantages of cross-linked polyethylene insulated cables are.
Polyvinyl chloride has good physical and mechanical properties and excellent process performance. It is the most used plastic in the 20th century. It is also the main insulation material and sheath material for low-voltage wires and cables. But entering the 21st century, PVC will gradually shrink or even fade out in the cable market. There are two reasons for this. On the one hand, people’s safety awareness has increased and they hope to adopt halogen-free materials, so many halogen-free materials have emerged. There is no doubt that it will become the new favorite of the 21st century cable industry and squeeze the market. On the other hand, PVC has five weaknesses: one is its high density, which is about 1.5 times that of cross-linked polyethylene, and its insulation cost is high; the other is its low working temperature; and the third is its higher dielectric loss than cross-linked polyethylene. One hundred times higher; fourth, poor cold resistance (brittle at -15 degrees); fifth, toxic gas (HCL) is released during combustion. In recent years, the mechanical properties, electrical heating properties, and insulation resistance of cross-linked polyvinyl chloride developed in recent years have been greatly improved. Some small cross-section cables have been introduced into the market by irradiation technology, and they have been used in equipment and installation wires, high-voltage lead wires, automotive wires and building wiring. Application, but its shortcoming of halogen cannot be changed.
Fluoroplastics are widely used in wires and cables due to their high working temperature, small medium, insulation, weather resistance, acid and alkali resistance, oil resistance, and good flame retardancy. Among them, polyperfluoroethylene propylene is particularly popular due to its good manufacturability. But it is expensive, and users have to think twice.
Low-smoke halogen-free polyolefin is a new type of cable sheathing material that has not been developed in the 20th century. Its greatest advantage is its flame retardancy, low smoke and non-toxic gas during combustion, and it is increasingly widely used in important public buildings.

Introduction to ABC Cable

1. The main features of overhead insulated conductors (ABC cables) have good insulation performance.
Overhead insulated conductors have an extra layer of insulation and have superior insulation performance than bare conductors, which can reduce the distance between lines, reduce the insulation requirements for line supports, and increase the number of circuits erected on the same pole. Overhead insulated (ABC) cable uses and characteristics-Jianzhenda Cable|Jianzhenda Wire and Cable|Jianzhenda-Jianzhenda Cable has good insulation performance. Overhead insulated conductors have an extra layer of insulation and have superior insulation performance than bare conductors, which can reduce the distance between lines, reduce the insulation requirements for line supports, and increase the number of circuits erected on the same pole. Good corrosion resistance.
2. The specification core of the overhead insulated wire. There are two types of overhead insulated wires: aluminum core and copper core. In the distribution network, aluminum core applications are more, mainly because aluminum is lighter and cheaper, and has low requirements for line connectors and support parts. In addition, the original distribution lines are mainly steel core aluminum stranded wires. The aluminum core wire is used to facilitate the connection with the original network. In actual use, aluminum core wires are often used. Copper core wire is mainly used as the down conductor of transformers and switchgear. Insulation Materials. There are two types of insulation protection layers for overhead insulated wires: thick insulation (3.4mm) and thin insulation (2.5mm). The thick insulation allows frequent contact with trees during operation, and the thin insulation allows only short-term contact with trees. The insulating protective layer is divided into cross-linked polyethylene and light polyethylene, and the insulating properties of cross-linked polyethylene are better.
3. The laying method of overhead insulated wires is a single conventional laying method.
This erection method is to use the current conventional cement poles, iron accessories and ceramic insulator accessories with bare conductors, and erect according to the bare conductor erection method, which is more suitable for the area where the old line is reconstructed and the corridor is sufficient. A special insulating bracket is used to suspend the wires for single laying. This method can increase the number of circuits erected, save the line corridors, and reduce the cost of the line unit.
4. The application area of ​​overhead insulated wires is suitable for places with many trees.
Lines erected by bare conductors are often shielded by the erection and maintenance of lines and greening and forestry in areas with many trees. The use of overhead insulated wires can reduce tree felling (early erection and operation and maintenance stages), solve many problems, and reduce conflicts with greening and forestry departments, protect the ecological environment, beautify the city, and reduce the line Ground Fault. Used in areas where there is a lot of metal dust and pollution. In old industrial areas, metal processing companies often have metal dust flying in the wind due to environmental protection failures. In polluted areas of thermal power plants and chemical plants, short circuits and ground faults in overhead distribution lines have been caused. The use of overhead insulated wires is a better way to prevent short-circuit grounding of 10 kV distribution lines. Suitable for salt spray areas. The salt spray corrodes the bare wires very seriously, which greatly reduces the tensile strength of the bare wires. In the event of wind and rain, the wires will break, causing short circuit grounding accidents and shortening the service life of the wires. The use of overhead insulated wires can better prevent salt spray corrosion.
5. Design and construction of ABC conductors. The insulated wires and the steel core aluminum stranded wires are in the same specification, and the current carrying capacity of the insulated wires is smaller than that of the bare wires. After the insulated wire is added with the insulating layer, the heat dissipation of the wire is poor, and its current-carrying capacity is almost a grade lower than that of the bare wire. Therefore, when designing and selecting, the insulated wire should be selected a larger gear. At the same time, the strain clamp is directly clamped on the wire insulator. In order to prevent excessive wire tension from cracking or peeling of the insulation layer, the maximum working stress of generally insulated wires is about 41N/mm2. Wire arrangement and pitch. The conductor arrangement of overhead insulated lines is basically the same as that of bare conductor lines, which can be divided into: triangular, vertical, horizontal, and multi-loop erection on the same pole. The span of overhead insulated lines should be controlled at 50m. The distance between phases of insulated wires. Due to the good insulation performance of overhead insulated wires, the distance between phases is smaller than that of bare conductor lines, but the distance between vertical and triangular arrangements is not less than 0.3m; the distance between horizontal arrangements is not less than 0.4m. The vertical and horizontal distances of two circuit lines erected on the same pole shall not be less than 0.5m. The clearance distance between the jumper, the down conductor and the adjacent lead wire and low-voltage line, and the clearance distance between the overhead insulated wire and the pole wire or frame shall not be less than 0.2m. Connection of insulated wires. The connection of the insulated wire is not allowed to be twisted, and the insulated wire should not be connected within the span as much as possible. It can be connected when the tension rod is jumper. If you really want to connect within the span, within a span, each wire cannot exceed one socket, and the distance between the connector and the fixed point of the wire should not be less than 0.5m. Insulated wires of different metals, different specifications, and different twisting directions are strictly forbidden to make load-bearing connections within the pitch. The connection point of the insulated wire should be wrapped with an insulating cover or self-adhesive insulating tape. Sag of insulated wire. After the conductor is erected, considering the influence of plastic elongation on sag, the sag reduction method should be used to compensate. The percentage of sag reduction is 20% for aluminum or aluminum alloy core insulated wires and 7% to 8% for copper core insulated wires. When the wire is tightened, the insulated wire should not be overdrawn. After the wire is tightened, the sag of each phase wire in the same gear should be consistent. Fixing of insulated wires. Insulated wire and insulator are fixed with insulated wire. For pin-type or rod-type insulators, the straight rod adopts the top groove tying method, and the direct angle rod adopts the side groove tying method, which is tied to the side groove of the outer corner of the line. The screw-type insulator is bound in the side groove, and the insulating wire and the contact part of the insulator should be wound with insulating self-adhesive tape. Construction and erection of insulated wires. The construction and erection of insulated wires is different from overhead bare wires. It does not allow the wires to damage the insulation layer during the construction process. Pay attention to the protection of the insulation layer during construction, and try to avoid contact and friction between the wire insulation layer and the ground and tower accessories. Overlap of insulated conductors and drop wires. The connection of jumper wires and drop wires of insulated wires is different from that of bare wires, because insulated wires need special wire strippers to strip the insulation layer. The process is more complicated and the requirements are stricter. The jumper connection can be connected by a parallel groove clamp or a connecting pipe. The lead wire can be connected with a parallel groove clamp or a T-shaped clamp. At the same time, wrap the interface with an insulating cover or insulating self-adhesive tape. Coordination of ordinary fittings and insulated wires. Overhead insulated wires have special line fittings, which can insulate the entire line. Considering the cost of the circuit, ordinary accessories can also be combined to reduce the cost of the circuit. Since the insulated wire has an extra layer of insulation, the wire diameter is larger than that of the bare wire. When using ordinary fittings, the wire fixing fittings and connecting fittings should be enlarged. The tension clamp should be clamped together with the protective layer of the wire to prevent the overhead insulated wire from peeling off, which affects its mechanical and insulation properties.
The use of insulated wires instead of bare wires is a technological advancement measure to achieve insulation of distribution lines, which can better improve the reliability, stability and safety of power supply, save line maintenance and management costs, and help improve the economic benefits of power supply enterprises. Compared with overhead bare wires, overhead insulated conductors have better performance, and the cost is not too high. In rural power grids, depending on local conditions, it is beneficial to use overhead insulated conductors in some areas.

Do aluminum alloy cables have to have aluminum alloy copper connectors?

Nowadays, aluminum terminals or so-called alloy terminals that do not match the cable performance are used to connect aluminum alloy cables in China. Most electrical accidents occur at the connecting part of the connecting terminal and the cable conductor. The stability and reliability of the connection between the cable conductor and the connection terminal are very important for the power supply system. Therefore, in order to ensure that the advantages and value of aluminum alloy cables can be used and reflected, and safe, there is no hidden danger of using aluminum alloy cables, and aluminum alloy cable connectors that match the performance of the aluminum alloy cables must be used.

Aluminum terminals or the so-called alloy terminals that do not match the performance of the aluminum alloy cable should be connected, so the aluminum connection terminals or the so-called physical and mechanical properties that do not match the cable performance and the potential safety problems still exist, but the electrical of the terminal The performance and the performance of the AAAC Conductors are highly compromised, and problems such as the use effect still exist. This kind of connection solution is undoubtedly the wrong connection solution. It will bring fatal safety hazards to the user’s transmission line and also bring hidden dangers to the development of the industry.
As we all know, the connection application technology of aluminum alloy cable should be similar to that of copper cable and aluminum alloy cable. In other words, the copper cable is connected with the copper nose, the aluminum alloy cable is connected with the copper and aluminum transition terminal, and the aluminum alloy cable is connected with the aluminum alloy copper connection terminal. Its performance is the same as that of the aluminum alloy cable. It is the correct cable and connection solution.

Is it better to buy ACSR Cable online or in physical stores?

I don’t know whether to buy ASTM 477 MCM ACSR Cable online or in physical stores. It mainly depends on which part of the demand you need to meet. For users with higher quality requirements, you can buy them in physical stores. After all, you can get in touch with the real thing. , Specifications, voltage, etc. to prevent errors.

Those users who are more price sensitive can order directly online; the advantage of online purchase is that the price is much cheaper than offline, because it can save the cost of site rent increase and other costs, especially the one-stop supply of ACSR Cable online. Manufacturers have special supply channels and direct sales at factory prices, which is very cost-effective.

For users who are unsure about the quality of the wire purchased online, this is actually unnecessary. We can identify the quality of the product through the sample map. Users in the same city can also directly check the production workshop; and the manufacturer has spent so much money to make the website online, it is not necessary For the sake of a single order, the previous efforts have been broken, so it is still very reliable to place an order online, provided that you must look for a more formal wire and cable website.
Yu Zheng is entangled in whether the cable is bought online or bought in a physical store. Jinhaotai suggests that you can first consult the product price online, then go to the physical store to check the quality in the same city, and then decide where to buy. After all, the advantages of online and physical stores have their own advantages.