Wire and cable products five categories

1. Bare wire and bare conductor products
The main features of this class of products are: pure conductor metal, no insulation and sheath layer, such as steel-cored aluminum strand wire, copper-aluminum busbar, electric locomotive wire; The processing technology is mainly pressure processing, such as melting, rolling, drawing, stranded/pressed stranded, etc. Products are mainly used in suburbs, rural areas, user lines, switch cabinets and so on.
2. Power cables
The main features of this class of products are: extruded (wound) outer conductor covering insulation layer, such as overhead insulated cables, or twisted several cores (corresponding to the phase, zero and ground wires of the power system), such as overhead insulated cables with more than two cores, or additional sheath layer, such as plastic/rubber sheathed wires and cables. The main technologies are drawing, stranding, insulation extruding (wrapping), cabling, armor, sheath extruding, etc. The different process combinations of various products are different to some degree.
The products are mainly used in the transmission of strong electric energy in the power lines of generation, distribution, transmission, transformation and power supply, with large current (tens to thousands of amps) and high voltage (220V to 500kV and above).


3. Wires and cables for electrical equipment
Such products, the main characteristics are: various specifications, application range, use voltage in 1 kv and below is more, to derive new products constantly, in the face of special occasions, such as fireproof cables, flame retardant cable, low smoke zero halogen/against termites, low smoke low halogen cable, mouse cable, oil/cold/heat resistance, abrasion resistance cable, medical/farm/mining cable, thin wire, etc.
4. Communication cable and optical fiber (brief introduction)
With the rapid development of the communication industry in the past twenty years, the products have also developed at an amazing speed. From the past simple telephone and telegraph cables to thousands of pairs of voice cables, coaxial cables, optical cables, data cables, and even combined communication cables.
The structure size of this kind of product is usually small and uniform, and the manufacturing precision is high.
5. Electromagnetic wire (winding wire)
Mainly used for all kinds of motors, instruments and meters.
A derivative/new product of wire and cable
The derivative/new products of wires and cables are mainly produced by adopting new materials, special materials, changing product structure, improving process requirements, or combining different kinds of products due to different application occasions, different application requirements, convenience of equipment and reducing equipment cost.
Use different materials such as flame retardant cable, low smoke halogen-free/low smoke halogen-free cable, termite proof, mouse proof cable, oil/cold/temperature resistant cable, etc.
Change product structure such as: fire-resistant cable, etc.
Improve the process requirements such as: medical cable;
Combined products such as OPGW, etc.
Easy to install and reduce equipment cost such as: prefabricated branch cable.

Production technology of wire and cable

Wires and cables are made by drawing, twisting, and cladding. The more complex the model and specification, the higher the repeatability.
A, control
In metal pressure machining, the metal cross section is compressed and the required cross section shape and size is obtained by forcing the metal through the die (pressing wheel) under the action of external force.
Drawing process is divided into single wire drawing and stranded drawing.


Second, stranding
In order to improve the softness of wires and cables, overall degree, let more than 2 single wire, according to the specified direction interweave together known as stranded.
Wring technology: conductor wring, cabling, weaving, steel wire armoring and winding.
Three, coated
According to different performance requirements for wires and cables, special equipment is used to cover the conductors with different materials. Coating process:
A. Extrusion: rubber, plastic, lead, aluminum and other materials.
B. Longitudinal bag: rubber, corrugated aluminum tape material.
C. Wrapping: strip paper tape, mica tape, alkali-free glass fiber tape, non-woven cloth, plastic tape, etc., linear cotton yarn, silk and other fiber materials.
D. Dip coating: insulating paint, asphalt, etc.

Cable breakpoint determination method

When a breakpoint occurs inside a wire or cable, it is difficult to visually determine the location of the breakpoint due to the wrapping of the external insulation.
Here are some quick ways to identify breakpoints:
Method of non-damaged cable:


Digital multimeter method
First connect one end of the breakpoint cable to the 220V wire and leave the other end dangling. Adjust the multimeter’s gear to ac 2V. Then, starting from the firewire access end of the faulty cable, one hand grasps the black marker pen, and the red marker slowly slides along the insulation layer of the faulty cable. The voltage of the cable without breakpoint is about 0.445V. When the red watch pen moves to a certain place, the voltage value displayed by the multimeter drops to 1/10 of the normal voltage, i.e. 0.04V. At this point, it can be concluded that the breakpoint is 15cm forward (firewire access).
This method cannot be used if the shield layer of the shield wire is not damaged.
Two, induction pen method
Firstly, it is excluded that there is power supply in the cable around the breakpoint cable. Then, the cable with breakpoint is connected to the fire line. Then, the induction pen is used to move slowly perpendicular to the cable.


Three, broken line method
For short cable test breakpoints, bend the two ends of the cable to the two ends of the red and black watch pen of the multimeter. Bend back and forth from one end of the cable. If the multimeter goes on and off at this point, the break point is here. Follow this method until you reach the break point.
Damaged cable methods:
Four. Acupuncture discrimination method


This method USES the on and off of the cable to check the breakpoint of the cable. Insert the steel needle on the breakpoint cable in sections, and then measure the on-off condition using a multimeter in turn. The difference is where the break point is. However, this method will damage the insulation layer, which is easy to cause other problems in later cable use.
Five.Methods of professional instrument detection
1. In addition, the fault point of underground cable can be judged by audio detector.
2. The cable fault telemeter can be used to determine the length of the cable as well as the short circuit and open point.
3. Different methods are used to determine the breakpoint location according to the actual situation. The above methods can basically determine the breakpoint location of the cable.

How to identify inferior cable?

Cable quality is very important, as we all know, electricity must pay attention to safety, for fear of leakage, leakage of electricity will be bring us hurt, so we must pay attention to, but if you use a cable is bad, so even if we pay attention to, accident will happen easily, so choose cable is important to note that the following, we have to learn how to distinguish inferior cable.
One, try to bend: can take a wire head to bend repeatedly by hand, general feel soft, good fatigue strength, plastic or rubber feel elastic and no crack on the wire insulator is excellent. The fake insulation layer looks thick, but in fact it is mostly made of recycled plastic. As long as you press hard, the place will become white and break the wire after being bent 4 ~ 6 times.
Two, tear insulation: high quality insulation material has a certain mechanical strength and flexibility, easy tear not open. Poor quality wires can be torn or pinched by hand.
Three, see the combustion: according to the provisions of the electrical insulation layer has a certain flame retardant. Strip off a section of insulation and light it with a lighter. It is inferior wire that can continue to spontaneously ignite after leaving the open flame.


Four. Thickness test: Cut a section of the insulation layer to see whether there are visible pores in the section of the insulation layer and whether the wire core is located in the middle of the insulation layer. Not in the middle because the process is not high and caused by the core phenomenon, the use of air holes that insulation material is unqualified. Severe eccentricity is most likely to leak electricity on the thinner side, and the porosity also affects the compressive strength.
Five, look at the label: the content of the wire certificate produced by the regular manufacturer should include: “3C certification mark, certification number, model specification, implementation standard, rated voltage, wire length, production date, producer, inspector, factory name, factory address, fixed telephone, anti-counterfeiting mark, etc.” The labels of counterfeit products are often not printed clearly or printed with incomplete content.
Six, see the surface: normal power cable plastic skin soft and smooth, uniform color. The surface shall also be printed with several contents of the product qualification certificate, such as 3C certification mark, certification number, model, rated voltage, implementation standard, factory name, etc. At the same time, the writing must be clear and difficult to erase.

Distinguish between power cables and control cables

Power cable and control cable are widely used in people’s production and life, but many people do not know the difference between the two. Power cables are used in power system mains to transmit and distribute large functional electric energy, while control cables transmit electric energy directly from power distribution points of the power system to power connection lines of various electrical equipment and appliances. Let me show you six tips for distinguishing power cables from control cables:
Rated voltage: The rated voltage of power cable is generally 0.6/1kV and above, and the control cable is mainly 450/750V.
Ii. Insulation and sheath thickness: when producing power cables and control cables of the same specification, the insulation and sheath thickness of power cables are thicker than that of control cables.


Three, look at the implementation of the cable standard. Control cables belong to electrical equipment cables, and power cables are two of the five categories of cables. The standard of power cable is GB12706, and the standard of control cable is GB/T 9330. The flame retardant cable should also meet the technical conditions of IEC337-8 standard.
Four, look at the color of the insulation core: the insulation sleeve of each inner core of low-voltage power cable is generally color-coded; And the color of the control cable insulation core is generally black printed in white.
Five, look at the cable section. Power cable is mainly to transmit power, generally is a large section, control cable section is generally not more than 10 square. Power cable specifications can generally be large, up to 500 square; The control cable section is generally small, the maximum is generally not more than 10 square.
The above is the introduction of the method to distinguish power cable and control cable, hoping to help you better complete the selection of cable.

Advantages and uses of stranded wire

Twisted pair has been used for a long time. The telephone transmission uses twisted pair. Twisted pair is used in many industrial control systems, places with large interference, and long-distance transmission. The LAN we use today is also used. Twisted pair.
The reason why twisted pair is so widely used is because it has many advantages such as strong anti-interference ability, long transmission distance, easy wiring, and low price. Due to the large attenuation of the signal of the twisted pair, the frequency of the signal cannot be too high when the transmission distance is long, and high-speed signals such as Ethernet can only be limited to 100m.


For the video signal, the bandwidth reaches 6MHz, and if it is directly transmitted in the twisted pair, it will also be greatly attenuated. Therefore, to achieve long-distance transmission of the video signal on the twisted pair, it must be amplified and compensated. Twisted pair video transmission The device performs this function. With the addition of a pair of twisted pair video transmission equipment, the image can be transmitted to 1 to 2km. Twisted pair and twisted pair video transmission equipment are very cheap, not only did not increase the cost of the system, but when the distance increases, its cost has dropped a lot compared with the coaxial cable. Therefore, the use of twisted pair transmission in the monitoring system has obvious advantages:
1. Long transmission distance and high transmission quality. Due to the use of advanced processing technology in the twisted pair transceiver, it perfectly compensates the attenuation of the video signal amplitude of the twisted pair and the attenuation difference between different frequencies, maintaining the brightness and color of the original image and real-time, When the transmission distance reaches 1km or more, the image signal is basically free of distortion. If the relay method is adopted, the transmission distance will be farther.

2. Convenient wiring and high cable utilization. A pair of ordinary telephone lines can be used to transmit video signals. In addition, any one of the 5 types of unshielded twisted pair widely laid in the building can transmit one video signal without additional wiring. Even if it is re-wired, 5 types of cables are easier than coaxial cables. In addition, there are 4 pairs of twisted pairs in a category 5 cable. If one pair of cables is used to transmit video signals, the other pairs can also be used to transmit audio signals, control signals, power supply or other signals, which improves the cable. The utilization rate, while avoiding the trouble caused by the separate wiring of various signals, reduces the cost of the project.
3. Strong anti-interference ability. Twisted pair can effectively suppress common mode interference, even in a strong interference environment, the twisted pair can also transmit excellent image signals. Moreover, several pairs of twisted pairs in a cable are used to transmit different signals without interference.
4. High reliability and easy to use. To use twisted pair to transmit video signals, a dedicated transmitter should be connected at the front end and a dedicated receiver should be connected at the control center. This kind of twisted pair transmission equipment is cheap and easy to use. It does not require professional knowledge and too much operation. It can be installed once and work stably for a long time.
5. The price is cheap and the material is convenient. Because it is a common type 5 unshielded cable or common telephone line that is widely used at present, it is easy to purchase and the price is also very cheap, which brings great convenience to engineering applications.

Aluminum alloy cable and aluminum core cable

What are the differences between the performance of aluminum alloy cables and aluminum core cables
The performance of aluminum alloy cables and aluminum core cables are different. There are four aspects of corrosion resistance, mechanical properties, electrical conductivity, and creep resistance.
First,Corrosion resistance
Pure aluminum has better corrosion resistance than copper, but aluminum alloy has better corrosion resistance than pure aluminum, because the rare earth and other chemical elements added to aluminum alloy can increase the corrosion resistance of aluminum alloy, especially the electrochemical corrosion resistance. Solve the problem of electrochemical corrosion of pure aluminum at the joint for a long time.

Second, mechanical properties
1. Tensile strength and elongation. Compared with pure aluminum conductors, aluminum alloy conductors, due to the addition of special components and the use of special processing techniques, have greatly improved the tensile strength, and the elongation rate has been increased to 30%, which is safer and more reliable.
2. Bending performance. The bending performance of the aluminum core cable is very poor, and the bending is easy to break. The bending radius of the aluminum alloy power cable is 7 times the outer diameter of the cable, which is far better than the 10 in GB/T12706 “Minimum bending radius during cable installation”. Times -20 times the outer diameter of the cable.
3. Flexible performance. As long as the pure aluminum cable is twisted at a certain angle a few times, the conductor will crack or break, which is easy to cause accidents, and the aluminum alloy power cable can withstand dozens of bends, eliminating the accidents that occurred during the installation and use of pure aluminum cables in the past Hidden dangers have greatly improved safety and reliability.


Three,Conductivity
Aluminum alloy conductor is an emerging conductor material formed by alloying process by adding rare earth, magnesium, copper, iron and other elements to pure aluminum. As we all know, after adding other kinds of alloying elements to aluminum, the conductivity will be reduced, and through the process control, the conductivity can be restored to the level close to pure aluminum, so that it has a similar current carrying capacity as pure aluminum.
Fourth, creep resistance
Pure aluminum has poor creep resistance. The thermal expansion and contraction caused by power on and off will cause a large creep at the connection, and it will relax after a long time. The contact resistance will increase and cause overheating, which may easily cause accidents. The creep resistance of AA8000 series aluminum alloy is 300% of the pure aluminum conductor, which greatly reduces the possibility of cable joint slack and improves the connection status of the conductor.

Aluminium alloy cable

If there is a fault in the use of aluminum alloy cables, the larger allowable temperature of the cable should be taken into account in all normal short circuits, which is a case of aluminum alloy cable fault. If you want to know how to find a problem and solve it quickly, let’s take a look.

Aluminium alloy cable

Aluminum cables are light in weight and suitable for large-span engineering buildings such as stadiums and expo centers. Aluminum alloy cable can reduce the load of building steel structure and save the cost of steel structure. In addition, the application of aluminum alloy cable in high-rise buildings can reduce the difficulty and workload of vertical cable laying, save labor costs, and reduce the risk of body damage during cable construction. The melting point of aluminum is 660℃. Aluminum alloy cables should not be used in the fire safety line of the power supply system.

With the development trend of urban distribution network, the load density is getting higher and higher, and the total number of cables installed on the cable safety channel is increasing. In order to deal with the problem of shortage of cable safety channel resources, in the case of large short-circuit capacity, the direct cost of aluminum alloy cable can be fully considered when selecting aluminum alloy cable, and the comprehensive cost of aluminum alloy cable can also be fully considered.

In addition, the aluminum alloy cable allowed short circuit fault temperature and thermal stability index is smaller than copper conductor cable, so the thermal stability inspection should be carried out to ensure the reliable operation of the power network.

In the case of similar energy consumption, the cross-section of aluminum alloy profile core cable is larger than that of copper core cable, that is, the aluminum alloy profile core cable is larger than that of copper core cable, so as to achieve the same bearing capacity, the increase of the total cross-section area of the cable will harm the cable pavement, cable safety channel structure and electrical performance. Above is about aluminium alloy cable a few basic knowledge points, everybody can have a basic understanding to its.

The difference between wire and cable

Wires and cables are wire products used to transmit electrical (magnetic) energy, information and realize electromagnetic energy conversion. In the broad sense, wires and cables are also referred to as cables. In the narrow sense, cables refer to insulated cables. One or more insulated conductors and the respective cladding, total protective covering and outer covering they may have. The cable may also have an additional conductor without insulation. Wire products for the transmission of electrical (magnetic) energy, information and electromagnetic energy conversion.

Such products, the main characteristics are: various specifications, application range, use voltage in 1 kv and below is more, to derive new products constantly, in the face of special occasions, such as fireproof cables, flame retardant cable, low smoke zero halogen/against termites, low smoke low halogen cable, mouse cable, oil/cold/heat resistance, abrasion resistance cable, medical/farm/mining cable, thin wire, etc.

Circuit Group provides the overall service equipment for a certain load source group, such as relay lines, switching devices and control systems. The basic research content of traffic service theory is to study the relationship among traffic volume, call loss and wiring harness capacity. Therefore, wiring harness is an important basic concept in traffic service theory.

The load source is the service object of the wire harness, usually the user device. Broadly speaking, the upper level device is the load source of the lower level device. In telephone communication, the load source is also called the call source, and the number of service devices contained in the wiring harness is called the wiring harness capacity. Figure 1 is a schematic diagram of the wiring harness. This harness has a capacity of V and it serves N load sources. Any load source that makes a call can occupy an idle service device in the harness.

Welcome to Henan Huaxing wire and Cable Co., LTD. The company has 30 years of development, the company has supporting laboratories and professional technical personnel, in each batch of wire and cable production inspection to ensure strict quality control. Sales area has expanded to Singapore, Malaysia, Cambodia, Myanmar, the Middle East, Australia, Europe and the United States, Africa and other countries, and by domestic and foreign customers praise. The company has gradually developed into a regional leading wire and cable enterprises and domestic leading cable enterprises.

What is the function of wire and cable armour?

In order to protect the structural integrity and electrical performance of the cable and improve the service life of the cable, it is necessary to add armor layer to the outer sheath of the cable. There are usually two types of cable armour, tape armour and wire armour.

I am going to take you through the functions of armored cables in the hope that it will be helpful for you to better understand armored cables.

Cable:
Armored cable refers to cable with metal armored protective layer. The purpose of cable armored layer is to enhance the service life of mechanical protection extension such as tensile strength and compressive strength, and also to improve by shielding protection

Cable anti-interference performance.
Common armor materials include steel tape, steel wire, aluminum tape, aluminum tube, etc. Steel tape and steel wire armor layer have high magnetic permeability and good magnetic shielding effect, which can be used to resist low frequency interference and make the armored cable buried directly

Laying without wearing pipes and inexpensive in practical use more.

Shielded cable:
Armored cable mechanical protection layer can be added to any cable structure to increase the mechanical strength of the cable and improve the erosion resistance. It is a special cable designed for vulnerable areas to mechanical damage and erosion.

Any kind of laying can be adopted, and it is more suitable for directly buried laying in rocky areas. Generally speaking, some armored cables are also buried wires and cables. The purpose of power line transmission is to enhance the resistance of electric power cables with armor layer

In addition to mechanical protection extending its service life, such as tensile strength and compressive strength, the armor has the necessary resistance to external forces and can prevent some rats from biting, so as not to cause power transmission problems through the armor. The bending radius of the armor shall be required

Large, armored layers can be grounded to protect cables.

Henan Huaxing wire and cable Co., LTD., founded in 1986, has more than 30 years of brand precipitation, is a professional production of wire and cable products of large enterprises. The company’s wire and cable products are all raw materials used in China

The high purity non-oxygen copper, insulating materials and sheathing materials of high quality are produced and inspected in strict accordance with the national standards. All the products have passed the inspection before leaving the factory and meet the national sampling inspection. We are looking forward to cooperating with you.